JPS644529B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to high impact polyblends for molding.

Polyamide resins are well known for their excellent toughness, flexibility, abrasion resistance, and relatively high impact resistance. Molded or extruded polyamides find use in household products, consumer products, electronic device components, automotive parts, gear, and more.

Although the impact strength of polyamide resins is relatively high among molding resins, it is still insufficient when extremely high impact strength is required, for example in crash-absorbing automobile body parts. Compared to steel, for example, even modified polyamide molding resins, as known in the prior art, lack sufficient impact strength to significantly intervene in markets requiring high impact strength.

Past efforts to modify the properties of polyamide resins have led to the formation of blends with other resinous materials that themselves have certain desirable properties not found in polyamides, without any loss of the original properties of polyamides. It includes. For example, some attempts to improve impact strength include blending polyamides with graft or random copolymers of monoolefins and unsaturated carboxylic acids or esters thereof (U.S. Pat.
3,236,914 and 3,472,916) and methods of forming blends of polyamides, polyolefins and olefin-carboxylic acid copolymers (see US Pat. No. 3,373,223). Some improvement in impact strength has been obtained by using alkyl acrylate elastomers with polyamides (see US Pat. No. 3,984,497). Some tear resistance has been imparted to polyamides by the use of elastomers in amounts up to 15% (see US Pat. No. 3,546,319). These methods of modifying polyamides, either alone or in combination, have not provided the high degree of impact resistance necessary to withstand the impacts typical of minor motor vehicle accidents.

According to the teachings of U.S. Pat. No. 4,010,223, succinic acid is present in an elastomeric copolymer of ethylene, at least one nonconjugated diene, and at least one _C3 - _C6 -α-olefin (EPDM). Anhydride functionality is introduced. Improvements in impact resistance have been obtained by modifying polyamides using certain anhydride- or succinic-functionalized polymers and elastomers.

It is a significant advance in the art to achieve improved impact resistance in polyamide molding resins without sacrificing their desired properties through compositions not disclosed by the prior art;
This constitutes the object of the present invention.

The present invention comprises 50-97% by weight of polyamide resin, 3
The present invention relates to a polyblend suitable for molding into high impact molded articles consisting of a melt blended product of ~50% by weight of a hydroxyl-functional elastomer and an effective amount of a succinic acid-functional coupling agent. The present invention also encompasses melt blending methods suitable for such melt blending.

The molding resin is prepared by melt blending 50-97% by weight polyamide resin, 3-50% by weight hydroxyl-functional elastomer, and an effective amount of a succinic acid-functional coupling agent. The blend is subjected to heat and shear to disperse the elastomer, and a coupling reaction occurs between the polyamide resin and the elastomer via a succinic acid functional coupling agent.

A molded article made of the above molding resin is also an embodiment of the present invention. These molded resin products have surprisingly high impact resistance.

By "polyamide resin" herein is meant any polymer having repeating carbon amide groups in the main chain and having a molecular weight greater than 2000. The molecular weight referred to here is the number average molecular weight when referring to polyamides (see ``Principles of Polymer Chemistry'' by Flory, p. 273).

Such polyamide resins are usually prepared by condensing dicarboxylic acids or derivatives thereof having 2 to 20 carbon atoms and diamines having 2 to 15 carbon atoms in equimolar amounts, or by condensing lactams by known techniques. Manufactured by polymerization. Suitable polyamides are those based on lactams and on aliphatic diamines condensed with aliphatic or aromatic diacids. These include polyhexamethylene adipamide (nylon 6,6), polycaprolactam (nylon 6), polyhexamethylene sebacamide (nylon 6,10), and polyhexamethylene isophthalamide (nylon 6IA). , polyhexamethylene terephthalamide/isophthalamide (nylon
6TA/IA) and mixtures or copolymers thereof.

"Hydroxy-functional elastomer" means an elastomer having at least 5 molar equivalents of hydroxyl groups per 10 ⁶ grams of polymer. These elastomers are characterized by having a glass transition point of 0° C. or lower. Suitable elastomers have glass transition temperatures below -20°C and polymers 10 ⁶
It has 10 to 500 molar equivalents of hydroxyl groups per gram. These hydroxyl groups may be primary or secondary.

Elastomers with little or no unsaturation in the backbone are preferred. This is because saturated elastomers have higher thermal and oxidative stability. Known substantially saturated elastomers include poly(ethylene/propylene) (EPR);
Poly(ethylene/propylene/diene)
(EPDM, in which case the typical diene is unconjugated and 6
having ~20 carbon atoms), polyacrylate, poly(ethylene/acrylate),
Poly(propylene/acrylate), polyisobutylene (BUTYL) and poly(ethylene/vinyl acetate) (EVA).

Hydroxyl functionality can be introduced into the elastomer by any of several methods known in the art. These methods include:

(A) copolymers of elastomeric monomers and hydroxyl-functional monomers (e.g. 2-hydroxyethyl acrylate or allyl alcohol condensed with ethyl or butyl acrylate); (B) hydroxyl-functional monomers (e.g. (C) Hydrolysis or partial hydrolysis of elastomers with pendant acetate groups (e.g. EVA); (D) Grafting of elastomers with pendant unsaturation (e.g. EPDM) with diols (e.g. 2-hydroxyethyl acrylate); (E) Esterification of carboxyl-functional elastomers (e.g. ethylene/propylene/acrylic acid terpolymers) with diols; or (F) elastomers with pendant unsaturation (e.g.
oxidation of EPDM) to diols.

Known suitable hydroxyl-functional elastomers include polyacrylates and poly(ethylene/acrylates) based on alkyl acrylates having 1 to 15 carbon atoms in the alkyl group. Hydroxyl groups are conveniently introduced by copolymerization of hydroxyl-functional monomers and alkyl acrylate monomers. Suitable hydroxyl-functional monomers are 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate and the corresponding methacrylates, and allyl alcohol. In addition to ethylene units, acrylate elastomers may contain small amounts of non-acrylic units, such as other vinyl units.

Acrylic elastomers can be synthesized by any radical polymerization method known in the art, including emulsion polymerization, suspension polymerization, solution polymerization, or bulk polymerization.
Emulsion or suspension polymerization is preferred for all acrylic elastomers.

Emulsion polymerization is carried out by known methods using conventional materials including, for example, free radical initiators, soaps, emulsifiers, modifiers, and the like.

This polymerization process is initiated by either thermal or redox type initiator systems. Examples of thermal initiators are organic peroxides such as benzoyl peroxide,
Substituted benzoyl peroxides, acetyl peroxide, lauryl peroxide, ditertiary butyl peroxide, perester tertiary butyl peroxy pivalate; azo-type initiators such as azobisisobutyronitrile; persulfates, e.g. sodium, potassium or ammonium persulfates; and peroxyphosphates, such as sodium, potassium or ammonium peroxyphosphates.
Redox initiators include, for example, hydroperoxides (e.g. hydrogen peroxide, tertiary butyl hydroperoxide, cumene hydroperoxide, diisopropylbenzene hydroperoxide, etc.) and reducing agents (e.g. bisulfite, metabisulfite or hydrosulfite). sodium, potassium or ammonium salts, sulfur dioxide, hydrazine, ferric salts, isoascorbic acid, sodium formaldehyde sulfoxylate, etc.).

Emulsifiers or soaps suitable for the polymerization process described above are alkyl, aryl, alkaryl and aralkyl sulfonic acids, sulfuric acid and polyether sulfuric acid, alkali metal and ammonium salts of fatty acids and ethoxylated fatty acids, esters, alcohols, amines, amides, alkylphenols, complex organophosphoric acids and their alkali metal and ammonium salts.

Chain transfer agents including mercaptans, polymercaptans and polyhalogen compounds are often preferred in polymerization mixes.

"succinic functional coupling agent" means an average of two or more succinic anhydrides, succinic diacids or succinic monoesters (typically C ₁ -C ₈ ) per molecule; A compound or polymer containing an ester group. Examples of such coupling agents include styrene/maleic anhydride copolymers, ethylene/maleic anhydride copolymers, vinyl acetate/maleic anhydride copolymers, isobutylene/maleic anhydride copolymers, 1- Alkene/
Maleic anhydride copolymers, and vinyl monomers and acid anhydrides such as maleic anhydride, itaconic anhydride, citraconic anhydride, cyclohex-4
Other copolymers with ene-1,2-dicarboxylic anhydride, 5-norbornene-2,3-dicarboxylic anhydride, chloromaleic anhydride or dichloromaleic anhydride, and corresponding diacids and their It is a monoester derivative. Preferred are styrene/maleic anhydride copolymers (SMA) with low number average molecular weights (less than 5000) and average anhydride contents of 2 to 7 anhydride groups per molecule. Styrene/maleic anhydride copolymers have some of their anhydride groups hydrolyzed or esterified by reaction with one or more alcohols or with one or more amines. Includes those that have been amidated or imidized by reaction. Also included are polymers made from styrene, maleic anhydride and other vinyl monomers.

This melt blending operation may incorporate optionally desired substantially non-reactive or non-interfering additives, colorants or enhancers to impart or enhance existing properties or properties. Such materials may be incorporated into the essential ingredients to be melt blended. Particularly desirable among impact-resistant type molding resins may be reinforcing materials such as glass, metal, mica, silica, and the like. Heat stabilizers such as a combination of copper acetate and potassium iodide are particularly desirable in cases where the molded article will be exposed to high temperatures. Antioxidants such as organic phosphides/or hindered phenols may also be desirable. Such stabilizers and antioxidants are known in the art.

Modified polyamide resin is preferably 50-97% by weight
It may be prepared by melt blending 70-95% by weight polyamide, 3-50% by weight, preferably 5-30% by weight hydroxyl-functional elastomer, and an effective amount of a succinic acid-functional coupling agent.

In this specification, unless otherwise specified, when the amounts of polyamide, hydroxyl-functional elastomer and succinic acid-functional coupling agent are expressed in percentages in relation to melt blending, they refer to those employed in melt blending. It means weight percent based on the total amount of the three substances.

During melt blending, a coupling reaction occurs between the polyamide and elastomer components. Without limitation, it is believed that the coupling agent reacts with both the amine end groups of the polyamide and the hydroxyl groups of the elastomer component to effect coupling.

As used herein in connection with a succinic acid-functional coupling agent, the term "effective amount" refers to a polyamide and a hydroxyl-functional elastomer that, when melt blended together, bind the polyamide alone and the polyamide and the elastomer. is effective to form a composition having a greater impact strength than the combination of

Generally the amount of coupling agent to be melt blended is between 0.1% and 10% (by weight), preferably between 0.5 and 10% (by weight).
It is 3%. Within this range, the optimum or acceptable working level of the coupling agent may vary slightly depending on its succinic functionality, the amine content of the polyamide, and the hydroxyl content of the elastomer.
If the succinic content is very low and/or the hydroxyl content of the elastomer and/or the amine content of the nylon is very low, the maximum working amount of the coupling agent may be reduced to as little as about 2%.

Mixing and reaction of the three components can be accomplished using a single screw extruder, a twin screw extruder or any high shear commercial grade plastic compounding equipment. Melt blending can be accomplished in one or several stages. In a single stage melt blending process, three components are blended simultaneously. Alternatively, the polyamide and elastomer components are blended first and the resulting blend is then blended with the succinic acid functional coupling agent. Alternatively, the elastomer component and the succinic acid functional coupling agent are first combined and the resulting blend is then blended with the polyamide component. If desired, the polyamide component is divided into two parts, each of which is first blended with one of the remaining two components and then the respective blends are blended.

The following examples are provided to assist those skilled in the art in carrying out the present invention. Parts and percentages are by weight unless otherwise specified.

Example 1 Preparation of hydroxyl-functional acrylic elastomer by bulk polymerization 3.325 Kg of butyl acrylate, 175 g of 2-hydroxyethyl methacrylate and 3.5 g of azobisisobutyronitrile (AIBN) until a homogeneous single phase solution is achieved. The mixture was mixed and stirred at room temperature.
Oxygen was removed from the solution by bubbling dry nitrogen gas through it. It was then poured into the recess of a 6.35 mm thick vertical press with a platen preheated and coated with a fluorocarbon type anti-adhesive compound (trade name Teflon).

This solution was heated for 50 min in a dry nitrogen gas blanket.
Polymerization was carried out for 24 hours at 65°C and then for 50 hours at 65°C. The product obtained after cooling to room temperature was a transparent sticky elastomer sheet.

Example 2 Two-Step Blending Process A of Nylon, Hydroxyl Functional Elastomer and SMA Coupling Agent 2.8 Kg of nylon 6,6 having a number average molecular weight (Mn) of approximately 12000 and 0.7 Kg of small cubes of the elastomer prepared in Example 1 were dry blended. The mixture was blended and then melt blended by extrusion through a 3.81 cm single screw extruder with a barrel and die temperature of 280°C. The extruder was equipped with a mixing screw and a choke valve. The Cheyoke valve was adjusted to maintain a maximum back pressure of 21-24 MPa during extrusion for increased shear strength.
The mixture was extruded four times.

B 3 Kg of this pelletized blend containing 20% elastomer and SMA-3000A (styrene/maleic anhydride copolymer, Mn 1900, acid number 270, manufactured by Alco Chemical Company)
60 g were dry blended and then melt blended by extrusion (3 times) as described above. This pelletized blend was then molded using an industrial reciprocating screw injection molding machine to 3.175mm
It was injection molded into a bar measuring 12.7 mm x 12.7 cm. The bars were kept dry in sealed polyethylene bags and conditioned at room temperature for 24 hours prior to testing. Notched Izod impact strength is 742J/m
It was hot.

A control sample of the same nylon 6,6 was injection molded and tested in the same manner as above. The Izod impact strength was 59 J/m notch.

A second control sample was prepared by extrusion compounding (7 passes) a blend of 2.4 Kg of nylon 6,6 and 0.6 Kg of the elastomer prepared in Example 1. The Izod impact strength was 164 J/m notch. Izod impact strength is ASTM D 256-73
Measured according to.

Example 3 2.4 Kg of nylon 6,6 and 0.6 Kg of the elastomer prepared in Example 1 were dry blended and then melt blended as described in Example 2A. 2.485Kg of this pelletized blend and 25
g of SMA-3000A were dry blended and then melt blended and molded as described in Example 2B. The Izod impact strength was 517 J/m notch.

Example 4 2.4 Kg of nylon 6,6 and 0.6 Kg of the elastomer prepared in Example 1 were dry blended and then extrusion compounded as described in Example 2A.
2.94Kg of this pelletized blend and 88.2g SMA
-3000A and then melt blended with Example 2B.
It was molded as described in . The Izod impact strength was 202 J/m notch.

Example 5 3.465Kg of butyl acrylate, 35g of 2-hydroxyethyl methacrylate and 5g of
A hydroxyl-functional acrylic elastomer was prepared as described in Example 1 from bulk polymerization of AIBN. The polymerization was carried out at 50°C for 16 hours and then at 80°C.
It was conducted for 16 hours. The product was a sheet of clear adhesive elastomer.

Example 6 2.4 Kg of nylon 6,6 and 0.6 Kg of the elastomer made in Example 5 were dry blended and then extrusion compounded (using only 3 passes) as described in Example 2A. The melt strength of this blend decreased with each pass, and it became too low to perform a fourth pass of extrusion. This material could not be molded.

2.7 Kg of this pelletized blend containing 27 g of SMA-3000A was dry blended and then melt blended (3 passes) and molded as described in Example 2B. Izod impact strength is
It was 165J/m notch.

Example 7 Alternating two-stage blending process 50 g of the elastomer produced in Example 5 and
2.5 g of SMA-3000A was mixed using a Brabender plasticorder equipped with a mixing and heating device. Mixing was carried out at 160 rpm for 15 minutes at 200°C.

This blended elastomer/SMA blend 475
g (from 10 replicate batches) and nylon 6,
6 was dry blended and then melt blended by extrusion (two passes) and molded as described in Example 2B. The Izod impact strength was 759 J/m notch.

Example 8 (Comparative example) 45 g of the elastomer produced in Example 5 and
5.85 g of SMA-3000A was mixed using a Brabender plasticorder equipped with a mixing and heating device. Mixing was carried out at 200° C. and 160 rpm for 10 minutes.

475g of this elastomer/SMA blend (10
from repeated batches) and nylon 6,6
1.9 Kg was dry blended and then melt blended by extrusion as described in Example 2A. The melt viscosity of this blend was very high and the extruded strands were coarse even after three passes. This indicates that the SMA level is too high for this particular elastomer/coupling agent combination. This blend was not molded for testing.

Example 9 Production of elastomer 2 kg of butyl acrylate, ethyl acrylate
450g, 2-hydroxyethyl acrylate 50g
A hydroxyl-functional elastomer was prepared as described in Example 1 from bulk polymerization of 2.5 g of AIBN and 2.5 g of AIBN. Polymerization for 48 hours at 50°C and then at 80°C
It was conducted for 15 hours. The product was a sheet of clear, slightly tacky elastomer.

Example 10 A 7.6 Kg of nylon 6,6, 1.9 Kg of the elastomer prepared in Example 9 and a 2.9/29 g amount of cupric acetate/potassium iodide stabilizer were dry blended and then prepared as described in Example 2A. and extrusion (four passes).

B 3 Kg of the pelletized blend made in Example 10A and 30 g of SMA-3000A were dry blended and then compounded by extrusion (3 passes) and molded as described in Example 2B. The Izod impact strength was 639 J/m notch.

A blend of 2 Kg of nylon 6,6, 0.5 Kg of the elastomer made in Example 9 and 0.75/75 g of cupric acetate/potassium iodide stabilizer was blended (7 passes) and processed as described in Example 2. A control sample was prepared by molding. The Izod impact strength was 88 J/m notch.

Example 11 3Kg of the blend made in Example 10A and 60g
of SMA-3000A were dry blended and compounded by extrusion (three times) and molded as described in Example 2B. Izotsu impact strength is 363J/
It was m-notsuchi.

Example 12 3Kg of the blend made in Example 10A and 15g
of SMA-3000A was dry blended and then compounded by extrusion (3 times) and molded as described in Example 2B. Izod impact strength is
It was 210J/m notch.

Example 13 2.7 Kg of nylon 6,6 and 0.9 g of the elastomer made in Example 9 were blended as described in Example 2A (4 times). 3.2 Kg of this pelletized blend and 32 g of SMA-3000A were then blended (twice) and molded as described in Example 2B. The Izod impact strength was 815 J/m notch.

Example 14 Nylon 6 containing 10% w/w nylon 6,
2.8 Kg of 6/6 random copolymer and 0.7 Kg of the elastomer prepared in Example 9 were blended as described in Example 2A (4 passes). 2.95Kg of pelletized blend and 29.5g of SMA-3000A were dry blended and mixed (3 passes) and the example
Molded as described in 2B. The Izod impact strength was 830 J/m notch.

Example 15 A 2.4Kg of 40/60 poly(hexamethylene terres)
Isophthalamide/(nylon 6TA/IA) random copolymer and 0.8 Kg of the elastomer prepared in Example 9 were blended (4 passes, 295°C) as described in Example 2A. A sample of this blend was molded as a control as described in Example 2B. The Izod impact strength was 128 J/m notch.

B Dry blend 1.2 Kg of the pelletized blend made in Example 15A and 12 g of SMA-3000A and then blend (4 passes, 295°C)
and molded as described in Example 2B.
The Izod impact strength was 297 J/m notch.

A control sample of the same nylon 6TA/IA was molded using the same conditions described above. The Izod impact strength was 104 J/m.

Example 16 Suspension Polymerization of Hydroxyl-Functional Acrylic Elastomer A solution of 5 g NaCl, 0.8 g poly(acrylic acid) suspending agent and 2.155 Kg water was prepared in a 5 volume three neck flask. The aqueous solution was heated to 70°C and stirred under nitrogen. A monomer solution consisting of 719 g of butyl acrylate, 36 g of 2-hydroxyethyl methacrylate and 1.6 g of AIBN was prepared in a separate flask. The monomer solution was deoxygenated by bubbling dry nitrogen gas through it and added to a separately prepared aqueous solution. The mixture was stirred under nitrogen for 5 hours, during which time the temperature was gradually increased from 70°C to 85°C. After cooling to room temperature, the resulting elastomeric beads were separated by filtration, washed with water and dried.

Example 17 1.54 Kg of nylon 6,6, 410 g of the elastomer made in Example 16 and 0.6/5.8 g of cupric acetate/potassium iodide stabilizer were blended by extrusion as described in Example 2A. (3 times).
1.73Kg of this pelletized blend was then 34.6g
Mix with SMA-3000A (3 passes), and e.g.
Molded as described in 2B. The Izod impact strength was 630 J/m notch.

Example 18 Preparation of an elastomer By suspension polymerization as described in Example 16, 5 g of NaCl,
0.9g poly(acrylic acid) suspending agent and 2.042Kg
Hydroxyl A functionalized elastomer was produced.

Example 19 A 2.4 Kg of nylon 6,6, 0.6 Kg of the elastomer made in Example 18 and 0.9/9 g of cupric acetate/potassium iodide stabilizer were extruded as described in Example 2A. Mixed (twice).

B 2.75Kg of pelletized blend and 82.5Kg of
SMA-3000A was dry blended and then compounded (3 passes) and molded as described in Example 2B. Izod impact strength is
It was 170J/m notch.

Example 20 2.27 Kg of the nylon 6,6/elastomer blend (prepared in Example 19A) was blended (3 passes) with 68.1 g of SMA-3000A and molded as described in Example 2B. The Izod impact strength was 123 J/m notch.

Example 21 Preparation of Hydroxyl-Functional Acrylic Elastomer by Emulsion Polymerization A hydroxyl-functional acrylic elastomer is prepared by emulsion polymerization using a seeding technique to control the particle size and the distribution of hydroxyl functional groups within the particles. did. The surfactant was sodium lauryl sulfate and the initiator was potassium persulfate. Monomer and surfactant were added continuously over a 4 hour polymerization cycle at 55°C. Two monomer feeds were used. The first feed was a solution of 972 g of butyl acrylate and 4.8 g of 1,4-butanediol diacrylate. The second feed added after the first feed was complete was a solution of 17.5 g butyl acrylate and 17.5 g 2-hydroxyethyl acrylate. The resulting latex was coagulated by adding it to an excess of 50/50 methanol/water containing 2% NaCl. The coagulated crumb is then mixed with methanol/
Washed with water and dried.

Example 22 A 3.5 Kg of nylon 6,6 and 875 g of the elastomer made in Example 21 were blended as described in Example 2A (4 passes).

B Pelleted blend made in Example 22A
2.021 Kg and 20.2 g of SMA-3000A were dry blended and then compounded (3 passes) and molded as described in Example 2B. The Izod impact strength was 153 J/m notch.

Example 23 2.021Kg of nylon 6 produced in Example 22A,
6/Elastomer blend and 30.3g of SMA-
3000A (3 passes) and molded as described in Example 2B. The Izod impact strength was 189 J/m notch.

Example 24 An elastomer was prepared as described in Example 21, except that the second monomer feed was 26.2 g.
of butyl acrylate and 8.8 g of 2-hydroxyethyl acrylate.

Example 25 A 3.1 Kg of nylon 6,6 and 775 g of the elastomer made in Example 24 were blended as described in Example 2A (4 passes).

B Pelleted blend made in Example 25A
1.795 Kg and 18 g of SMA-3000A were blended (3 passes) and molded as described in Example 2B. The Izod impact strength was 172 J/m notch.

Example 26 Pelletized blend made in Example 25A 1.795
Mix Kg and SMA-3000A26.9g (3 passes)
and molded as described in Example 2B.
The Izod impact strength was 229 J/m notch.

Example 27 An elastomer was prepared as described in Example 21, except that the second monomer feed was 8.8 g.
of butyl acrylate and 26.2 g of 2-hydroxyethyl acrylate.

Example 28 A 3.1 Kg of nylon 6,6 and 775 g of the elastomer made in Example 27 were blended as described in Example 2A (4 passes).

B 1.783 Kg of the pelletized blend made in Example 28A and 17.8 g of SMA-3000A were dry blended and then blended (3 passes) and molded as described in Example 2B. The Izod impact strength was 99 J/m notch.

Example 29 1.783 Kg of the pelletized blend made in Example 28A and 26.7 g of SMA-3000A were dry blended and then blended (3 passes) and
Molded as described in 2B. The Izod impact strength was 107 J/m notch.

Example 30 400 g of ethylene/vinyl acetate/vinyl alcohol terpolymer with a hydroxyl content of 7.8% and 3.6 Kg of nylon 6,6 were blended by extrusion (two passes) as described in Example 2A. This pelletized blend 3.6Kg and SMA-
78 g of 17352A (modified styrene/maleic anhydride copolymer, Mn 1700, acid value 270) was then mixed (3
2 passes) and molded as described in Example 2B. The Izod impact strength was 128 J/m notch.

The foregoing examples are intended to be illustrative of the invention, and not to limit it. Various modifications can be made without departing from the spirit of the invention.

Claims (1)

[Claims] 1 The following components: (A) A polyamide resin having repeating carbon amide groups in the main chain and a number average molecular weight of 2000 or more.
50-97% by weight, (B) at least 5 per ⁶ grams of elastomer 10
3-50% by weight of a hydroxy-functional elastomer having molar equivalents of hydroxyl groups, and (C) an average of two or more succinic anhydride, succinic acid, or succinic monoester groups in the molecule. A high impact molding polyblend comprising a melt blend product comprising an effective amount of a succinic acid functional coupling agent. 2. A patent in which the polyamide resin is selected from the group consisting of polyhexamethylene adipamide, polyhexamethylene sebacamide, polycaprolactam, polyhexamethylene isophthalamide, polyhexamethylene telecoisophthalamide, and mixtures of said copolymers. A polyblend according to claim 1. 3 The elastomer is hydroxyl functional poly(ethylene/propylene), poly(ethylene/propylene/diene), polyacrylate, poly(ethylene/acrylate), poly(propylene/acrylate), polyisobutylene, poly(ethylene/vinyl acetate) and A polyblend according to claim 1 selected from the group consisting of mixtures of the foregoing. 4 Succinic acid functional coupling agent is styrene/
Maleic anhydride copolymer, ethylene/maleic anhydride copolymer, vinyl acetate/maleic anhydride copolymer, vinyl ether/maleic anhydride copolymer, 1-alkene/maleic anhydride copolymer The polyblend of claim 1 selected from the group consisting of: and mixtures of the foregoing. 5 Succinic acid functional coupling agent is styrene/
The polyblend of claim 1 which is a maleic anhydride copolymer. 6. The polyblend according to claim 1, wherein component (A) is 70 to 95% by weight. 7. The polyblend according to claim 1, wherein component (B) is 5 to 30% by weight. 8. The polyblend according to claim 1, wherein component (C) is 0.1 to 10% by weight. 9. The polyblend according to claim 1, wherein component (C) is 0.5 to 3% by weight. 10 (A) Polycaprolactam, polyhexamethylene adipamide, polyhexamethylene sebamide, polyhexamethylene isophthalamide, polyhexamethylene telecoisophthalamide, and mixtures and copolymers of the foregoing. (B) an alkyl acrylate monomer whose alkyl group contains 1 to 15 carbon atoms, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 5-30% of a hydroxyl-functional acrylate elastomer prepared by copolymerizing with a hydroxyl-functional monomer selected from the group consisting of 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate and allyl alcohol, and (C) Claim 1 comprising an effective amount of a styrene/maleic anhydride copolymer having a number average molecular weight of less than 5000 and an average anhydride group content of 2 to 7 anhydride groups per molecule. polyblend. 11 Component (A) is polyhexamethylene adipamide and the hydroxyl functional monomer of component (B) is 2-hydroxyethyl methacrylate.
A polyblend according to claim 10. 12. The polyblend of claim 10, wherein component (A) is polyhexamethylene adipamide and the hydroxyl functional monomer of component (B) is 2-hydroxyethyl acrylate.