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US20060084763A1 - Transparent ionomeric films from blends of ionomeric copolymers - Google Patents

Transparent ionomeric films from blends of ionomeric copolymers Download PDF

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Publication number
US20060084763A1
US20060084763A1 US11/165,159 US16515905A US2006084763A1 US 20060084763 A1 US20060084763 A1 US 20060084763A1 US 16515905 A US16515905 A US 16515905A US 2006084763 A1 US2006084763 A1 US 2006084763A1
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Prior art keywords
film
copolymer
copolymers
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blend
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US11/165,159
Inventor
Richard Arhart
Geraldine Lenges
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Performance Materials NA Inc
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Individual
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Priority to US11/165,159 priority Critical patent/US20060084763A1/en
Assigned to E. I. DU PONT DE NEMOURS AND COMPANY reassignment E. I. DU PONT DE NEMOURS AND COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LENGES, GERALDINE M., ARHART, RICHARD J.
Publication of US20060084763A1 publication Critical patent/US20060084763A1/en
Priority to US12/148,637 priority patent/US8338539B2/en
Assigned to PERFORMANCE MATERIALS NA, INC. reassignment PERFORMANCE MATERIALS NA, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: E.I. DU PONT DE NEMOURS AND COMPANY
Abandoned legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04Homopolymers or copolymers of ethene
    • C08L23/08Copolymers of ethene
    • C08L23/0846Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
    • C08L23/0869Acids or derivatives thereof
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/1055Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
    • B32B17/10743Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer containing acrylate (co)polymers or salts thereof
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/32Layered products comprising a layer of synthetic resin comprising polyolefins
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18Manufacture of films or sheets
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04Homopolymers or copolymers of ethene
    • C08L23/08Copolymers of ethene
    • C08L23/0846Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
    • C08L23/0869Acids or derivatives thereof
    • C08L23/0876Neutralised polymers, i.e. ionomers
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04Homopolymers or copolymers of ethene
    • C08J2323/08Copolymers of ethene
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00Polymer mixtures characterised by other features
    • C08L2205/02Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group

Definitions

  • This invention relates to films useful as encapsulants for photovoltaic (solar) cells.
  • This invention particularly relates to films comprising ethylene acid copolymer ionomers useful as encapsulants for photovoltaic cells.
  • films useful in applications where optical properties are important may not have other physical or mechanical properties—such as, for example modulus—suitable for use in the desired field of use.
  • Blends of ionomers have found particular application in golf ball covers.
  • U.S. Pat. No. 5,587,430 to DuPont describes an ionomer composition for improved high temperature performance.
  • U.S. Pat. No. 5,567,772 to DuPont describes an ionomer blend comprising a polymer that is an ethylene/acid copolymer ionomer which is a partially neutralized copolymer of ethylene and methacrylic acid or acrylic acid.
  • Blends of high and low modulus ionomers for use in a golf ball have been described in U.S. Pat. No. 5,415,937.
  • blended compositions suitable for use in a golf ball cover or other parts of a golf ball are not properties that are considered critical or of any influence to golf ball performance or acceptance.
  • Blending ionomers having a modulus that is acceptable for an encapsulant application with other ionomers having acceptable optical properties can result in optical properties and modulus that are intermediate between the properties of the components. This can be an unsatisfactory result where improved optical properties or modulus are desirable.
  • the present inventors have made the surprising discovery that it is possible to blend ionomers and obtain a film product that is more flexible than would be expected based on the moduli of the component polymers and yet without a sacrifice in the optical clarity that would be expected from blending two chemically distinguishable materials. Indeed, the optical clarity is very close to that of the more clear component in the mixture.
  • the present invention is a blend of at least two chemically distinguishable copolymers that are each obtained by copolymerization of ethylene with at least one other comonomer, wherein the at least one other comonomer is an ethylenically unsaturated carboxylic acid, and wherein a film obtained from the blend (a) has a secant modulus of less than about 15,000 psi as measured according to ASTM D882-01 and (b) (i) transmits at least about 85% of incident visible light and/or (ii) has a haze value of equal to or less than about 6% as measured according to ASTM D1003-00.
  • the present invention is the product that is obtained after melt extrusion of a blend of at least two chemically distinguishable copolymers that are each obtained by copolymerization of ethylene with at least one other comonomer, wherein the at least one other comonomer is an ethylenically unsaturated carboxylic acid, and wherein a film obtained from the blend (a) has a secant modulus of less than about 15,000 psi as measured according to ASTM D882-01 and (b) (i) transmits at least about 85% of incident visible light and/or (ii) has a haze value of equal to or less than about 6% as measured according to ASTM D1003-00.
  • the present invention is a film obtained by extruding, casting, or blowing a blend of at least two chemically distinguishable copolymers that are each obtained by copolymerization of ethylene with at least one other comonomer, wherein the at least one other comonomer is an ethylenically unsaturated carboxylic acid, and wherein a film obtained from the blend (a) has a secant modulus of less than about 15,000 psi as measured according to ASTM D882-01 and (b) (i) transmits at least about 85% of incident visible light and/or (ii) has a haze value of equal to or less than about 6% as measured according to ASTM D1003-00.
  • the present invention is a film which has a modulus which is less than would be predicted from a composition weighted average of the moduli of films obtained by casting or blowing from the first copolymer and the second copolymer and further optional copolymers alone.
  • the present invention is a process for preparing an optically transparent film having a modulus of less than about 15,000 psi as measured according to ASTM D882-01 wherein the film (i) transmits at least about 85% of incident visible light and/or (ii) has a haze value of equal to or less than about 6% as measured according to ASTM D1003-00, the process comprising the step of: blending at least two chemically distinguishable copolymers that are each obtained by copolymerization of ethylene with at least one other comonomer, wherein the at least one other comonomer is an ethylenically unsaturated carboxylic acid.
  • the invention is a photovoltaic (solar) cell module that comprises at least one encapsulant layer comprising an optically transparent film, said film comprising a blend of a first copolymer, a second copolymer and optional further copolymers each of said copolymers being chemically distinguishable and being obtained by copolymerization of ethylene each with at least one other comonomer, wherein the at least one other comonomer is independently an ethylenically unsaturated carboxylic acid or derivative thereof, and wherein the film (a) has a secant modulus of less than about 15,000 psi as measured according to ASTM D882-01 and (b) (i) transmits at least about 85% of incident visible light and/or (ii) has a haze value of equal to or less than about 6% as measured according to ASTM D1003-00.
  • two materials have different monomer compositions in the polymer chain.
  • two ionomers that are copolymers of ethylene and a second acid comonomer are chemically distinguishable for the purposes of the present invention if they have different mole percentages (and/or different weight percentages) of the two comonomers in the chain or, alternatively, they are considered chemically distinct if at least one of the comonomers in one of the copolymers has a distinct chemical identity from either of the comonomers in the other material.
  • the present invention is an optically transparent film, wherein the film can be obtained from a blend of suitable polymer resins.
  • optically transparent it is meant that the film of the present invention is at least 85% transparent to light in the visible region of the light spectrum.
  • Optical transparency can be related to the haze of the multilayer laminate film. In one embodiment of the present invention, the haze of the film is not greater than 6%.
  • the present invention is a blend of a first copolymer, a second copolymer and optional further copolymers each of said copolymers being chemically distinguishable and being obtained by copolymerization of ethylene with at least one other comonomer, wherein the at least one other comonomer is an ethylenically unsaturated carboxylic acid, and wherein a film obtained from the blend (a) has a secant modulus of less than about 15,000 psi as measured according to ASTM D882-01 and (b) (i) transmits at least about 85% of incident visible light and/or (ii) has a haze value of equal to or less than about 6% as measured according to ASTM D1003-00.
  • the blend or the optically transparent film comprises at least two chemically distinguishable copolymer resins of ethylene and an ethylenically unsaturated carboxylic acid, or a derivative, or an equivalent thereof.
  • carboxylic acid ethylene copolymers with acrylic acid and/or methacrylic acid (referred to hereinafter in any combination as (meth)acrylic acid) can be preferred.
  • carboxylic acids are well-known to one of ordinary skill in the art and can be used alternatively to, or in addition to, the carboxylic acid comonomer.
  • Such acid derivatives or equivalents are: esters; anhydrides; acid salts; acid halides; amides; nitrites, and the like.
  • Salts of ethylene/(meth)acrylic acid copolymers are conventionally known as ionomers, and are particularly preferred in the practice of the present invention.
  • the polymers can be selected based on the optical and physical properties of a film obtained from the individual components.
  • a suitable blend candidate can have a secant modulus of less than about 35,000 psi, preferably less than about 30,000, and more preferably less than about 25,000. Most preferably, the secant modulus of a film obtained from a component of the blend is less than about 20,000.
  • the components of the blend are selected such that at least one component, when in combination with the other component(s), will provide the final film with a secant modulus of less than about 15,000.
  • a component of the blend can also be selected on the basis of its optical properties as measured on a film obtained therefrom.
  • a film obtained from a component of the blend preferably has a percent transmission (% T) of greater than about 85%, more preferably greater than about 87%, even more preferably greater than about 88%, and most preferably greater than about 90%.
  • the components of the blend are selected such that a film obtained from the blend has a secant modulus of less than about 15,000 and optical transmission of at least about 85%.
  • a film obtained from a blend of the present invention has a secant modulus of less than about 14,000, and more preferably less than about 13,000. Most preferably, the secant modulus of the film is less than about 12,000 and the optical transmission is greater than about 88%.
  • a film can be obtained from the blend of the invention by any means known to one skilled in the art, and which may include, without limitation, melt extrusion followed by casting the melt onto a cold surface or using a gas to blow a bubble from the melt that is then cooled and solidified.
  • the means for obtaining a film can also include a process such as dissolution solvent evaporation or precipitation.
  • the haze of a film of the present invention is preferably less than about 5%, more preferably less than about 4%, and most preferably less than about 3%. It is surprising that a blend can provide a film having optical properties that are on the same order as a monocomponent film. It is generally accepted by those of ordinary skill in the art that ionomers that differ by more than 3 wt % acid are not readily miscible, and can result in haze levels that are undesirable in a film that is intended to have low haze.
  • the components can be blended in any proportion suitable and appropriate to provide a film that has optical and physical properties that are suitable for use as an encapsulant layer in a solar cell.
  • a blend of the present invention can be prepared by conventional blending processes such as, for example, dry-blending of pellets, melt-blending, or co-extrusion.
  • Ionomers useful in the practice of the present invention are copolymers obtained by the copolymerization of ethylene and an ethylenically unsaturated C 3 -C 8 carboxylic acid.
  • the unsaturated carboxylic acid is either acrylic acid or methacrylic acid.
  • the acid copolymer preferably includes from about 8 wt % to about 20 wt % of the acid, based on the total weight of the copolymer.
  • Ionomers useful herein preferably comprise from about 12 wt % to about 20 wt % acid, more preferably from about 14 wt % to about 19 wt % acid, and most preferably from about 15 wt % to about 19 wt % acid.
  • the acid component described is inclusive of any neutralized acid that exists in the salt form.
  • the acid copolymer preferably includes from about 15 wt % to about 25 wt % methacrylic acid.
  • the acid groups in the copolymer are highly neutralized to include from about 65 mole % to about 100 mole % of the neutralized acid carboxylate.
  • Conventional ionomers of this type can be obtained commercially from E.I. du Pont de Nemours and Company (DuPont), for example.
  • two ionomeric components can be combined in a proportion ranging from about 20 wt % Component 1:80 wt % Component 2 to about 60 wt % Component 1:40 wt % Component 2, wherein Component 1 is an ionomer component having a secant modulus of less than about 15,000 and Component 2 is an ionomer component having an optical transmission of at least about 87%.
  • Conventional ionomers can include, in addition to the ethylene and acid components, a third comonomer component which is an ester of an ethylenically unsaturated carboxylic acid.
  • Conventional ionomers that include a third comonomer are commercially available from DuPont, for example, and can be suitable for use in the practice of the present invention so long as the optical and physical properties are suitable for application in the present invention.
  • a film of the present invention can be useful in a variety of applications.
  • the film of the present invention can exhibit excellent adhesion to glass as well as to other materials such as, for example, plastic and/or other transparent materials, and thus can be suitable for use in combination with glass, or clear plastic, to make optically clear or transparent laminate articles, laminated windows or safety glass.
  • Resin 1 ionomeric resin, 15 wt % methacrylic acid 1.2% zinc ion, Ml of 5.5;
  • Resin 2 acid copolymer resin, 11.5 wt % acrylic acid, Ml of 1.5;
  • Resin 3 ionomeric resin, 10 wt % methacrylic acid 0.75% zinc ion, Ml of 4.0.
  • the expected values (EV) of the modulus was the linear combination that is established by calculating the weight (for EV 1) or mole (for EV 2) average modulus from the moduli of the individual components.
  • Resin 1 was extruded in a Werner Pfleiderer 30 mm twin-screw extruder.
  • the barrel temperatures were set at 150° C. (rear), 160° C. (center rear), 190° C. (center), 190° C. (front), 190° C. (adaptor), and 190° C. (die).
  • the resin was extruded at approximately 80 amps, 230 RPM, 440 psi and 210° C. melt temperature.
  • a cast film was prepared from the extrudate on a 1.1 D cast film line.
  • the haze of the film was determined according to ASTM D1003-00.
  • the transmittance (% T) was determined using a Varian Cary 5 uv/vis/nir system. The film was scanned from 800 nm to 200 nm, and % T reported at 500 nm.
  • the secant modulus was determined according to ASTM D882-01. The results are given in Table 1.
  • Comparative Example 1 The procedure of Comparative Example 1 was repeated except that the film was obtained from 100 wt % Resin 2.
  • Comparative Example 1 The procedure of Comparative Example 1 was repeated except that the film was obtained from 100 wt % Resin 3.
  • Comparative Example 1 The procedure of Comparative Example 1 was repeated except that the 2 mil monolayer film was obtained from a blend of 25 wt % Resin 1 with 75 wt % Resin 3. Haze, secant modulus, and % T are reported in Table 1.
  • Example 1 The procedure of Example 1 was repeated except that resins 1 and 3 were combined in a ration of 50:50. Haze, secant modulus, and % T are reported in Table 1.
  • Example 1 The procedure of Example 1 was repeated except that resins 1 and 2 were combined in a ration of 50:50. Haze, secant modulus, and % T are reported in Table 1. TABLE 1 Modulus (2 % Transmittance Example trials) Haze (%) EV 1 EV 2 C1 29,302/32,183 2.26 90.6 C2 19,935/19,728 2.67 88.4 C3 9,957/10,212 2.23 88.1 1 11,757/11,549 2.24 89.4 15,249 14,922 2 15,529/14,359 2.18 88.7 20,414 19,969 3 22,845/22,659 3.53 90.1 25,287 24,968

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Laminated Bodies (AREA)

Abstract

The present invention is a film obtained from a blend of chemically distinguishable copolymers, wherein the film has a light transmission of at least 85%, and/or a haze of less than 6%, and wherein the blend comprises a component copolymer has a secant modulus of less than 15,000 when cast independently into a film.

Description

  • This application claims the benefit of U.S. Provisional Application No. 60/582,563, filed Jun. 24, 2004.
  • BACKGROUND OF THE INVENTION
  • 1. Field of the Invention
  • This invention relates to films useful as encapsulants for photovoltaic (solar) cells. This invention particularly relates to films comprising ethylene acid copolymer ionomers useful as encapsulants for photovoltaic cells.
  • 2. Description of the Related Art
  • In applications where good optical properties are important, it can be a requirement to have a film that is substantially transparent to light. Films useful in applications where optical properties are important may not have other physical or mechanical properties—such as, for example modulus—suitable for use in the desired field of use.
  • Blends of ionomers have found particular application in golf ball covers. For example U.S. Pat. No. 5,587,430 to DuPont describes an ionomer composition for improved high temperature performance.
  • U.S. Pat. No. 5,567,772 to DuPont describes an ionomer blend comprising a polymer that is an ethylene/acid copolymer ionomer which is a partially neutralized copolymer of ethylene and methacrylic acid or acrylic acid.
  • Golf ball covers have been obtained from blends of high acid ionomers with other ionomers. For example U.S. Pat. No. 5,873,796 to Acushnet Company claims a golf ball comprising a core and at least one cover layer comprising a blend of a high acid ionomer formed from an acid copolymer having an acid content of 19 weight percent; and an ionomer formed from an acid copolymer having an acid content of 15 weight percent.
  • Blends of high and low modulus ionomers for use in a golf ball have been described in U.S. Pat. No. 5,415,937.
  • U.S. Pat. No. 4,884,814 to Spalding teaches blending a hard ionomer resin with a soft ionomer resin to produce a golf ball cover.
  • U.S. Pat. No. 5,120,791 to Lisco describes a composition for use in a golf ball said to have enhanced carrying distance.
  • Other patents of interest that demonstrate the current state of the art in blending of ionomers are U.S. Pat. Nos. 5,688,869, 5,691,418, and 5,328,959.
  • The teaching of the golf ball related art describes blended compositions suitable for use in a golf ball cover or other parts of a golf ball. It is of note, however, that transparency and haze (optical properties) are not properties that are considered critical or of any influence to golf ball performance or acceptance.
  • Blending ionomers having a modulus that is acceptable for an encapsulant application with other ionomers having acceptable optical properties can result in optical properties and modulus that are intermediate between the properties of the components. This can be an unsatisfactory result where improved optical properties or modulus are desirable.
  • It would therefore be desirable to provide an ionomer film that incorporates both the physical and optical properties desirable for use in applications where both physical properties and optical properties of a film are important.
  • SUMMARY OF THE INVENTION
  • The present inventors have made the surprising discovery that it is possible to blend ionomers and obtain a film product that is more flexible than would be expected based on the moduli of the component polymers and yet without a sacrifice in the optical clarity that would be expected from blending two chemically distinguishable materials. Indeed, the optical clarity is very close to that of the more clear component in the mixture.
  • In one embodiment, the present invention is a blend of at least two chemically distinguishable copolymers that are each obtained by copolymerization of ethylene with at least one other comonomer, wherein the at least one other comonomer is an ethylenically unsaturated carboxylic acid, and wherein a film obtained from the blend (a) has a secant modulus of less than about 15,000 psi as measured according to ASTM D882-01 and (b) (i) transmits at least about 85% of incident visible light and/or (ii) has a haze value of equal to or less than about 6% as measured according to ASTM D1003-00.
  • In another aspect, the present invention is the product that is obtained after melt extrusion of a blend of at least two chemically distinguishable copolymers that are each obtained by copolymerization of ethylene with at least one other comonomer, wherein the at least one other comonomer is an ethylenically unsaturated carboxylic acid, and wherein a film obtained from the blend (a) has a secant modulus of less than about 15,000 psi as measured according to ASTM D882-01 and (b) (i) transmits at least about 85% of incident visible light and/or (ii) has a haze value of equal to or less than about 6% as measured according to ASTM D1003-00.
  • In a still another aspect, the present invention is a film obtained by extruding, casting, or blowing a blend of at least two chemically distinguishable copolymers that are each obtained by copolymerization of ethylene with at least one other comonomer, wherein the at least one other comonomer is an ethylenically unsaturated carboxylic acid, and wherein a film obtained from the blend (a) has a secant modulus of less than about 15,000 psi as measured according to ASTM D882-01 and (b) (i) transmits at least about 85% of incident visible light and/or (ii) has a haze value of equal to or less than about 6% as measured according to ASTM D1003-00.
  • In still another aspect, the present invention is a film which has a modulus which is less than would be predicted from a composition weighted average of the moduli of films obtained by casting or blowing from the first copolymer and the second copolymer and further optional copolymers alone.
  • In another aspect, the present invention is a process for preparing an optically transparent film having a modulus of less than about 15,000 psi as measured according to ASTM D882-01 wherein the film (i) transmits at least about 85% of incident visible light and/or (ii) has a haze value of equal to or less than about 6% as measured according to ASTM D1003-00, the process comprising the step of: blending at least two chemically distinguishable copolymers that are each obtained by copolymerization of ethylene with at least one other comonomer, wherein the at least one other comonomer is an ethylenically unsaturated carboxylic acid.
  • In a still further aspect the invention is a photovoltaic (solar) cell module that comprises at least one encapsulant layer comprising an optically transparent film, said film comprising a blend of a first copolymer, a second copolymer and optional further copolymers each of said copolymers being chemically distinguishable and being obtained by copolymerization of ethylene each with at least one other comonomer, wherein the at least one other comonomer is independently an ethylenically unsaturated carboxylic acid or derivative thereof, and wherein the film (a) has a secant modulus of less than about 15,000 psi as measured according to ASTM D882-01 and (b) (i) transmits at least about 85% of incident visible light and/or (ii) has a haze value of equal to or less than about 6% as measured according to ASTM D1003-00.
  • DETAILED DESCRIPTION OF THE INVENTION
  • By “chemically distinguishable” as applied to two polymeric materials it is meant that the two materials have different monomer compositions in the polymer chain. For example, two ionomers that are copolymers of ethylene and a second acid comonomer are chemically distinguishable for the purposes of the present invention if they have different mole percentages (and/or different weight percentages) of the two comonomers in the chain or, alternatively, they are considered chemically distinct if at least one of the comonomers in one of the copolymers has a distinct chemical identity from either of the comonomers in the other material.
  • In one embodiment the present invention is an optically transparent film, wherein the film can be obtained from a blend of suitable polymer resins. By optically transparent it is meant that the film of the present invention is at least 85% transparent to light in the visible region of the light spectrum. Optical transparency can be related to the haze of the multilayer laminate film. In one embodiment of the present invention, the haze of the film is not greater than 6%.
  • In a further embodiment, the present invention is a blend of a first copolymer, a second copolymer and optional further copolymers each of said copolymers being chemically distinguishable and being obtained by copolymerization of ethylene with at least one other comonomer, wherein the at least one other comonomer is an ethylenically unsaturated carboxylic acid, and wherein a film obtained from the blend (a) has a secant modulus of less than about 15,000 psi as measured according to ASTM D882-01 and (b) (i) transmits at least about 85% of incident visible light and/or (ii) has a haze value of equal to or less than about 6% as measured according to ASTM D1003-00.
  • In the practice of the present invention, the blend or the optically transparent film comprises at least two chemically distinguishable copolymer resins of ethylene and an ethylenically unsaturated carboxylic acid, or a derivative, or an equivalent thereof. For example, ethylene copolymers with acrylic acid and/or methacrylic acid (referred to hereinafter in any combination as (meth)acrylic acid) can be preferred. Derivatives or equivalents of carboxylic acids are well-known to one of ordinary skill in the art and can be used alternatively to, or in addition to, the carboxylic acid comonomer. Such acid derivatives or equivalents, for example, are: esters; anhydrides; acid salts; acid halides; amides; nitrites, and the like. Salts of ethylene/(meth)acrylic acid copolymers (either fully or partially neutralized) are conventionally known as ionomers, and are particularly preferred in the practice of the present invention.
  • The polymers can be selected based on the optical and physical properties of a film obtained from the individual components. For example, a suitable blend candidate can have a secant modulus of less than about 35,000 psi, preferably less than about 30,000, and more preferably less than about 25,000. Most preferably, the secant modulus of a film obtained from a component of the blend is less than about 20,000. In a much preferred embodiment, the components of the blend are selected such that at least one component, when in combination with the other component(s), will provide the final film with a secant modulus of less than about 15,000.
  • A component of the blend can also be selected on the basis of its optical properties as measured on a film obtained therefrom. For example, a film obtained from a component of the blend preferably has a percent transmission (% T) of greater than about 85%, more preferably greater than about 87%, even more preferably greater than about 88%, and most preferably greater than about 90%. In a particularly preferred embodiment, the components of the blend are selected such that a film obtained from the blend has a secant modulus of less than about 15,000 and optical transmission of at least about 85%. Preferably a film obtained from a blend of the present invention has a secant modulus of less than about 14,000, and more preferably less than about 13,000. Most preferably, the secant modulus of the film is less than about 12,000 and the optical transmission is greater than about 88%.
  • A film can be obtained from the blend of the invention by any means known to one skilled in the art, and which may include, without limitation, melt extrusion followed by casting the melt onto a cold surface or using a gas to blow a bubble from the melt that is then cooled and solidified. The means for obtaining a film can also include a process such as dissolution solvent evaporation or precipitation.
  • The haze of a film of the present invention is preferably less than about 5%, more preferably less than about 4%, and most preferably less than about 3%. It is surprising that a blend can provide a film having optical properties that are on the same order as a monocomponent film. It is generally accepted by those of ordinary skill in the art that ionomers that differ by more than 3 wt % acid are not readily miscible, and can result in haze levels that are undesirable in a film that is intended to have low haze.
  • The components can be blended in any proportion suitable and appropriate to provide a film that has optical and physical properties that are suitable for use as an encapsulant layer in a solar cell.
  • A blend of the present invention can be prepared by conventional blending processes such as, for example, dry-blending of pellets, melt-blending, or co-extrusion.
  • Ionomers useful in the practice of the present invention are copolymers obtained by the copolymerization of ethylene and an ethylenically unsaturated C3-C8 carboxylic acid. Preferably the unsaturated carboxylic acid is either acrylic acid or methacrylic acid. The acid copolymer preferably includes from about 8 wt % to about 20 wt % of the acid, based on the total weight of the copolymer. Ionomers useful herein preferably comprise from about 12 wt % to about 20 wt % acid, more preferably from about 14 wt % to about 19 wt % acid, and most preferably from about 15 wt % to about 19 wt % acid. Less than about 12 wt % acid can result in too low transmittance or too high haze of the optical layers. It is to be understood that in the present invention the acid component described is inclusive of any neutralized acid that exists in the salt form. If the acid is methacrylic acid, the acid copolymer preferably includes from about 15 wt % to about 25 wt % methacrylic acid. In the final blends, the acid groups in the copolymer are highly neutralized to include from about 65 mole % to about 100 mole % of the neutralized acid carboxylate. Conventional ionomers of this type can be obtained commercially from E.I. du Pont de Nemours and Company (DuPont), for example.
  • In a particularly preferred embodiment of the present invention, two ionomeric components can be combined in a proportion ranging from about 20 wt % Component 1:80 wt % Component 2 to about 60 wt % Component 1:40 wt % Component 2, wherein Component 1 is an ionomer component having a secant modulus of less than about 15,000 and Component 2 is an ionomer component having an optical transmission of at least about 87%.
  • Conventional ionomers can include, in addition to the ethylene and acid components, a third comonomer component which is an ester of an ethylenically unsaturated carboxylic acid. Conventional ionomers that include a third comonomer are commercially available from DuPont, for example, and can be suitable for use in the practice of the present invention so long as the optical and physical properties are suitable for application in the present invention.
  • A film of the present invention can be useful in a variety of applications. The film of the present invention can exhibit excellent adhesion to glass as well as to other materials such as, for example, plastic and/or other transparent materials, and thus can be suitable for use in combination with glass, or clear plastic, to make optically clear or transparent laminate articles, laminated windows or safety glass.
  • EXAMPLES
  • The Examples and Comparative Examples are presented for illustrative purposes only, and are not intended to limit the scope of the present invention in any manner.
  • In the following Examples and Comparative Examples the resins used are as follows:
  • Resin 1—ionomeric resin, 15 wt % methacrylic acid 1.2% zinc ion, Ml of 5.5;
  • Resin 2—acid copolymer resin, 11.5 wt % acrylic acid, Ml of 1.5; Resin 3—ionomeric resin, 10 wt % methacrylic acid 0.75% zinc ion, Ml of 4.0.
  • The expected values (EV) of the modulus was the linear combination that is established by calculating the weight (for EV 1) or mole (for EV 2) average modulus from the moduli of the individual components.
  • Comparative Example 1
  • Resin 1 was extruded in a Werner Pfleiderer 30 mm twin-screw extruder. The barrel temperatures were set at 150° C. (rear), 160° C. (center rear), 190° C. (center), 190° C. (front), 190° C. (adaptor), and 190° C. (die). The resin was extruded at approximately 80 amps, 230 RPM, 440 psi and 210° C. melt temperature. A cast film was prepared from the extrudate on a 1.1 D cast film line. The haze of the film was determined according to ASTM D1003-00. The transmittance (% T) was determined using a Varian Cary 5 uv/vis/nir system. The film was scanned from 800 nm to 200 nm, and % T reported at 500 nm. The secant modulus was determined according to ASTM D882-01. The results are given in Table 1.
  • Comparative Example 2
  • The procedure of Comparative Example 1 was repeated except that the film was obtained from 100 wt % Resin 2.
  • Comparative Example 3
  • The procedure of Comparative Example 1 was repeated except that the film was obtained from 100 wt % Resin 3.
  • Example 1
  • The procedure of Comparative Example 1 was repeated except that the 2 mil monolayer film was obtained from a blend of 25 wt % Resin 1 with 75 wt % Resin 3. Haze, secant modulus, and % T are reported in Table 1.
  • Example 2
  • The procedure of Example 1 was repeated except that resins 1 and 3 were combined in a ration of 50:50. Haze, secant modulus, and % T are reported in Table 1.
  • Example 3
  • The procedure of Example 1 was repeated except that resins 1 and 2 were combined in a ration of 50:50. Haze, secant modulus, and % T are reported in Table 1.
    TABLE 1
    Modulus (2 % Transmittance
    Example trials) Haze (%) EV 1 EV 2
    C1 29,302/32,183 2.26 90.6
    C2 19,935/19,728 2.67 88.4
    C3  9,957/10,212 2.23 88.1
    1 11,757/11,549 2.24 89.4 15,249 14,922
    2 15,529/14,359 2.18 88.7 20,414 19,969
    3 22,845/22,659 3.53 90.1 25,287 24,968
  • It is evident from the table that the actual modulus values that were obtained from the blends were at or below the values expected on the basis of either weight or mole fraction of components in the blend. However the transmittance numbers were improved over those of the low modulus component. In particular with blend examples 1 and 2, the transmittance that was obtained was close to that of the stiffer component, while the modulus was close to that of the softer component.
  • All aforementioned patents and patent applications are herein incorporated by reference in their entirety.
  • While it is apparent that the invention herein disclosed is well calculated to fulfill the objects above stated, it will be appreciated that numerous modifications and embodiments may be devised by those skilled in the art. It is intended that the appended claims cover all such modifications and embodiments as fall within the true spirit and scope of the present invention.

Claims (14)

1. A blend of at least a first copolymer and a second copolymer each of said copolymers being chemically distinguishable and being obtained by copolymerization of ethylene each independently with at least one other comonomer, wherein the at least one other comonomer is independently an ethylenically unsaturated carboxylic acid or derivative thereof, and wherein a film obtained from the blend (a) has a secant modulus of less than about 15,000 psi as measured according to ASTM D882-01 and (b) (i) transmits at least about 85% of incident visible light and/or (ii) has a haze value of equal to or less than about 6% as measured according to ASTM D1003-00.
2. The blend of claim 1 wherein the at least first and second copolymers are ionomers.
3. A film obtained from the blend of claim 1.
4. The film of claim 3 having a modulus as measured according to ASTM D882-01 which is less than that which would be predicted from a composition weighted average of the moduli of films obtained by producing films individually from the first copolymer and the second copolymer and further optional copolymers alone.
5. The film of claim 3 that transmits at least about 88% of incident visible light or (ii) has a haze value of equal to or less than about 3% as measured according to ASTM D1003-00.
6. The film of claim 5 wherein the at least first and second copolymers are ionomers.
7. The film of claim 6 wherein the at least first and second ionomers are derived from copolymers that each independently comprises from about 8 wt % to about 20 wt % of carboxylic acid monomer, based on the total weight of the copolymer.
8. The film of claim 7 wherein the at least first and second ionomers are derived from copolymers that each independently comprises from about 12 wt % to about 20 wt % of carboxylic acid monomer, based on the total weight of the copolymer.
9. The film of claim 8 wherein the at least first and second ionomers are derived from copolymers that each independently comprises from about 14 wt % to about 19 wt % of carboxylic acid monomer, based on the total weight of the copolymer.
10. The film of claim 9 wherein the first copolymer is present in a range of from about 20 wt % to about 60 wt %, and the second copolymer is present in a range of from about 80 wt % to about 40 wt %, and wherein the first copolymer is an ionomer component having a secant modulus of less than about 15,000 and the second copolymer is an ionomer component having an optical transmission of at least about 87%.
11. A composition obtained from the melt extrusion of a blend of a first copolymer, a second copolymer and optional further copolymers each of said copolymers being chemically distinguishable and being obtained by copolymerization of ethylene with at least one other comonomer, wherein the at least one other comonomer is an ethylenically unsaturated carboxylic acid or derivative thereof, and wherein a film obtained from the blend (a) has a secant modulus of less than about 15,000 psi as measured according to ASTM D882-01 and (b) (i) transmits at least about 85% of incident visible light or (ii) has a haze value of equal to or less than about 6% as measured according to ASTM D1003-00.
12. A film obtained from the blend of claim 11.
13. A photovoltaic cell module that comprises at least one encapsulant layer comprising an optically transparent film, said film comprising a blend of a first copolymer, a second copolymer and optional further copolymers each of said copolymers being chemically distinguishable and being obtained by copolymerization of ethylene each with at least one other comonomer, wherein the at least one other comonomer is independently an ethylenically unsaturated carboxylic acid or derivative thereof, and wherein the film (a) has a secant modulus of less than about 15,000 psi as measured according to ASTM D882-01 and (b) (i) transmits at least about 85% of incident visible light or (ii) has a haze value of equal to or less than about 6% as measured according to ASTM D1003-00.
14. A process for preparing an optically transparent film having a modulus of less than about 15,000 psi as measured according to ASTM D882-01 wherein the film (i) transmits at least about 85% of incident visible light or (ii) has a haze value of equal to or less than about 6% as measured according to ASTM D1003-00, the process comprising the step of: blending at least two chemically distinguishable copolymers that are each obtained by copolymerization of ethylene with at least one other comonomer, wherein the at least one other comonomer is an ethylenically unsaturated carboxylic acid.
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Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070221268A1 (en) * 2006-03-21 2007-09-27 Hasch Bruce M Encapsulants for electronic components
US20070221885A1 (en) * 2005-12-28 2007-09-27 Alberto Goenaga Solvent formulations for solution deposition of organic materials onto low surface energy layers
US20070234681A1 (en) * 2006-03-23 2007-10-11 Frans Adriaansen Storm panels and methods for manufacturing the same
US20080017241A1 (en) * 2006-07-21 2008-01-24 Anderson Jerrel C Embossed high modulus encapsulant sheets for solar cells
US20080023063A1 (en) * 2006-07-28 2008-01-31 Richard Allen Hayes Solar cell encapsulant layers with enhanced stability and adhesion
US20080023064A1 (en) * 2006-07-28 2008-01-31 Richard Allen Hayes Low modulus solar cell encapsulant sheets with enhanced stability and adhesion
US20080053516A1 (en) * 2006-08-30 2008-03-06 Richard Allen Hayes Solar cell modules comprising poly(allyl amine) and poly (vinyl amine)-primed polyester films
US20080099064A1 (en) * 2006-10-27 2008-05-01 Richard Allen Hayes Solar cells which include the use of high modulus encapsulant sheets
US20080128018A1 (en) * 2006-12-04 2008-06-05 Richard Allen Hayes Solar cells which include the use of certain poly(vinyl butyral)/film bilayer encapsulant layers with a low blocking tendency and a simplified process to produce thereof
US20080190481A1 (en) * 2007-02-12 2008-08-14 Richard Allen Hayes Low modulus solar cell encapsulant sheets with enhanced stability and adhesion
US20080196760A1 (en) * 2007-02-15 2008-08-21 Richard Allen Hayes Articles such as safety laminates and solar cell modules containing high melt flow acid copolymer compositions
US20080199690A1 (en) * 2007-02-15 2008-08-21 E. I. Du Pont De Nemours And Company Articles comprising high melt flow ionomeric compositions
US20080264471A1 (en) * 2007-04-30 2008-10-30 Richard Allen Hayes Solar cell modules comprising compositionally distinct encapsulant layers
US20090126781A1 (en) * 2007-11-16 2009-05-21 Richard Allen Hayes Multilayer terionomer encapsulant layers and solar cell laminates comprising the same
US20090151772A1 (en) * 2007-12-14 2009-06-18 E.I. Du Pont De Nemours And Company Terionomer Films or Sheets and Solar Cell Modules Comprising the Same
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US8637150B2 (en) 2007-10-01 2014-01-28 E I Du Pont De Nemours And Company Multilayer acid terpolymer encapsulant layers and interlayers and laminates therefrom

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Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4082877A (en) * 1975-02-14 1978-04-04 W. R. Grace & Co. Unoriented composite laminar film with an elastomeric layer and sealable layer
US4599392A (en) * 1983-06-13 1986-07-08 The Dow Chemical Company Interpolymers of ethylene and unsaturated carboxylic acids
US4884814A (en) * 1988-01-15 1989-12-05 Spalding & Evenflo Companies, Inc. Golf ball
US5120791A (en) * 1990-07-27 1992-06-09 Lisco, Inc. Golf ball cover compositions
US5328959A (en) * 1990-07-27 1994-07-12 Lisco, Inc. Golf ball cover compositions
US5415937A (en) * 1993-10-21 1995-05-16 Dunlop Slazenger Corporation Golf ball cover
US5567772A (en) * 1994-03-07 1996-10-22 E. I. Du Pont De Nemours And Company High flow ionomer resin compositions useful for golf ball covers
US5587430A (en) * 1995-09-29 1996-12-24 E. I. Du Pont De Nemours And Company Ethylene-acid copolymer and ionomer blends having improved high temperature properties and processibility
US5688869A (en) * 1991-10-15 1997-11-18 Lisco, Inc. Golf ball cover compositions
US5691418A (en) * 1993-06-18 1997-11-25 E. I. Du Pont De Nemours And Company Soft ionomer compositions and blends thereof and use thereof as golf ball structural materials
US5873796A (en) * 1990-12-10 1999-02-23 Acushnet Company Multi-layer golf ball comprising a cover of ionomer blends
US6329465B1 (en) * 1998-03-10 2001-12-11 Mitsui Chemical Inc Ethylene copolymer composition and uses thereof
US6743847B1 (en) * 1994-12-20 2004-06-01 Callaway Golf Company Golf ball cover compositions

Family Cites Families (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5969448A (en) * 1982-10-12 1984-04-19 Yokohama Rubber Co Ltd:The Interlayer composition used for glass laminate
JP2503261B2 (en) * 1988-11-19 1996-06-05 三井・デュポンポリケミカル株式会社 Ionomer composition and method for producing the same
US5051266A (en) * 1989-12-01 1991-09-24 Viskase Corporation Meat-adhering multilayer film
JP3300004B2 (en) * 1991-11-14 2002-07-08 三井・デュポンポリケミカル株式会社 Ionomer composition
GB9214105D0 (en) * 1992-07-03 1992-08-12 Exxon Chemical Patents Inc Ionomer compositions,processes for their preparation,uses and conversion processes therefor
JP3313195B2 (en) * 1993-06-30 2002-08-12 三井・デュポンポリケミカル株式会社 Ionomer packaging materials
US5631328A (en) * 1993-10-27 1997-05-20 Chevron Chemical Company Low-haze ionomers of copolymers of alpha-olefins, carboxylic acid esters, and optional comonomers, and processes for making and acidifying these ionomers
US5478402A (en) * 1994-02-17 1995-12-26 Ase Americas, Inc. Solar cell modules and method of making same
US5476553A (en) * 1994-02-18 1995-12-19 Ase Americas, Inc. Solar cell modules and method of making same
US5763062A (en) * 1996-11-08 1998-06-09 Artistic Glass Products Company Ionomer resin films and laminates thereof
US6187448B1 (en) * 1997-07-24 2001-02-13 Evergreen Solar, Inc. Encapsulant material for solar cell module and laminated glass applications
US6114046A (en) * 1997-07-24 2000-09-05 Evergreen Solar, Inc. Encapsulant material for solar cell module and laminated glass applications
JP4233071B2 (en) * 1999-10-20 2009-03-04 三井・デュポンポリケミカル株式会社 Solar cell sealing material and solar cell module
JP4437348B2 (en) * 1999-10-21 2010-03-24 三井・デュポンポリケミカル株式会社 Solar cell sealing material and solar cell module
JP4690517B2 (en) * 2000-03-22 2011-06-01 三井・デュポンポリケミカル株式会社 Ethylene copolymer composition
JP4336442B2 (en) * 2000-05-23 2009-09-30 キヤノン株式会社 Solar cell module
JP2001332751A (en) * 2000-05-23 2001-11-30 Canon Inc Composition for sealing solar cell and solar cell module using the same
US20030000568A1 (en) * 2001-06-15 2003-01-02 Ase Americas, Inc. Encapsulated photovoltaic modules and method of manufacturing same
US6660930B1 (en) * 2002-06-12 2003-12-09 Rwe Schott Solar, Inc. Solar cell modules with improved backskin
US20040144415A1 (en) * 2002-12-03 2004-07-29 Arhart Richard J. Ionomer/nylon films for use as backing layer for photovoltaic cells
US7902452B2 (en) * 2004-06-17 2011-03-08 E. I. Du Pont De Nemours And Company Multilayer ionomer films for use as encapsulant layers for photovoltaic cell modules
EP1824680B1 (en) * 2004-12-07 2019-07-03 E. I. du Pont de Nemours and Company Multilayer composite films and articles prepared therefrom

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4082877A (en) * 1975-02-14 1978-04-04 W. R. Grace & Co. Unoriented composite laminar film with an elastomeric layer and sealable layer
US4599392A (en) * 1983-06-13 1986-07-08 The Dow Chemical Company Interpolymers of ethylene and unsaturated carboxylic acids
US4884814A (en) * 1988-01-15 1989-12-05 Spalding & Evenflo Companies, Inc. Golf ball
US4884814B1 (en) * 1988-01-15 1992-02-18 Spalding & Evenflo
US5120791A (en) * 1990-07-27 1992-06-09 Lisco, Inc. Golf ball cover compositions
US5328959A (en) * 1990-07-27 1994-07-12 Lisco, Inc. Golf ball cover compositions
US5873796A (en) * 1990-12-10 1999-02-23 Acushnet Company Multi-layer golf ball comprising a cover of ionomer blends
US5688869A (en) * 1991-10-15 1997-11-18 Lisco, Inc. Golf ball cover compositions
US5691418A (en) * 1993-06-18 1997-11-25 E. I. Du Pont De Nemours And Company Soft ionomer compositions and blends thereof and use thereof as golf ball structural materials
US5415937A (en) * 1993-10-21 1995-05-16 Dunlop Slazenger Corporation Golf ball cover
US5567772A (en) * 1994-03-07 1996-10-22 E. I. Du Pont De Nemours And Company High flow ionomer resin compositions useful for golf ball covers
US6743847B1 (en) * 1994-12-20 2004-06-01 Callaway Golf Company Golf ball cover compositions
US5587430A (en) * 1995-09-29 1996-12-24 E. I. Du Pont De Nemours And Company Ethylene-acid copolymer and ionomer blends having improved high temperature properties and processibility
US6329465B1 (en) * 1998-03-10 2001-12-11 Mitsui Chemical Inc Ethylene copolymer composition and uses thereof

Cited By (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070221885A1 (en) * 2005-12-28 2007-09-27 Alberto Goenaga Solvent formulations for solution deposition of organic materials onto low surface energy layers
US7785489B2 (en) 2005-12-28 2010-08-31 E.I. Du Pont De Nemours And Company Solvent formulations for solution deposition of organic materials onto low surface energy layers
US20070221268A1 (en) * 2006-03-21 2007-09-27 Hasch Bruce M Encapsulants for electronic components
US7637074B2 (en) * 2006-03-23 2009-12-29 Sabic Innovative Plastics Ip B.V. Storm panels and methods for manufacturing the same
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EP1781735B1 (en) 2008-12-31
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US20080207834A1 (en) 2008-08-28
WO2006002389A1 (en) 2006-01-05
CN100577725C (en) 2010-01-06
JP2008504405A (en) 2008-02-14
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US8338539B2 (en) 2012-12-25
JP5166028B2 (en) 2013-03-21

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