JP2021165344A - ETHYLENE/α-OLEFIN/NON-CONJUGATED POLYENE COPOLYMER COMPOSITION AND USE THEREOF - Google Patents

Abstract

To provide an ethylene/α-olefin/non-conjugated polyene copolymer composition that is suitable for obtaining an injection molded product having excellent releasability from a metal mold after injection molding and having excellent rigidity.SOLUTION: The present invention relates to: an ethylene/α-olefin/non-conjugated polyene copolymer (S) that contains ethylene, α-olefin having 3 or more carbon atoms, and non-conjugated polyene as constituent units; an ethylene/α-olefin/non-conjugated polyene copolymer composition that contains a crystalline olefin polymer (G) in a range of 1 to 80 pts.mass and a carbon black (L) in a range of 10 to 300 pts.mass relative to 100 pts.mass of the ethylene/α-olefin/non-conjugated polyene copolymer (S); and a use thereof.SELECTED DRAWING: None

Description

The present invention relates to an ethylene / α-olefin / non-conjugated polyene copolymer composition, and more particularly to an ethylene / α-olefin / non-conjugated polyene copolymer composition having excellent injection moldability and its use.

An olefin-based thermoplastic elastomer obtained by cross-linking a composition of an ethylene / α-olefin / non-conjugated polyene copolymer and a crystalline olefin polymer, which is a type of thermoplastic elastomer, is lightweight and easy to recycle. It is widely used as an energy-saving and resource-saving type thermoplastic elastomer, particularly as an alternative to crosslinked rubber, for automobile parts such as hoses, pipes and boots (blow-molded products) for automobiles (for example, Patent Document 1). And 2).

However, although these automobile parts are always required to be lighter in order to improve fuel efficiency, the thermoplastic elastomer used contains a large amount of filler, so that the specific gravity tends to be large, which hinders the weight reduction of parts. Was. Further, in many cases, injection molding is adopted for some of these automobile parts in order to speed up the manufacturing process of the parts, and it is required to perform injection molding for parts having a complicated shape. ing. However, when a part having a complicated shape is injection-molded, it may not be easy to take out the molded product from the mold.

Japanese Unexamined Patent Publication No. 2001-294714 Japanese Unexamined Patent Publication No. 2011-202136

An object of the present invention is to obtain an ethylene / α-olefin / non-conjugated polyene copolymer composition suitable for obtaining an injection molded product having excellent mold removal property from a mold after injection molding and having good rigidity. It is in.

The present invention comprises an ethylene / α-olefin / non-conjugated polyene copolymer (S) containing ethylene, an α-olefin having 3 or more carbon atoms and a non-conjugated polyene as constituent units, and the ethylene / α-olefin / non-conjugated. It is characterized in that the crystalline olefin polymer (G) is contained in the range of more than 10 parts by mass to 300 parts by mass and the carbon black (L) is contained in the range of 10 to 300 parts by mass with respect to 100 parts by mass of the polyene copolymer (S). The present invention relates to an ethylene / α-olefin / non-conjugated polyene copolymer composition, and a crosslinked product of the copolymer composition.

Since the ethylene / α-olefin / non-conjugated polyene copolymer composition of the present invention is excellent in injection moldability, an injection molded product having a good appearance can be produced.

<< Ethylene / α-olefin / non-conjugated polyene copolymer (S) >>
The ethylene / α-olefin / non-conjugated polyene copolymer (S) (hereinafter, also referred to as “copolymer (S)”) is a structural unit derived from ethylene (A) and an α-olefin having 3 to 20 carbon atoms (hereinafter, also referred to as “copolymer (S)”). It has a structural unit derived from B) and a structural unit derived from a non-conjugated polyene (C). The non-conjugated polyene (C) contains at least two or more partial structures selected from the formulas (I) and (II) in the molecule in total.

Examples of the α-olefin (B) having 3 to 20 carbon atoms include propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-heptene, 1-octene and 1-decene. , 1-dodecene, 1-tetradecene, 1-hexadecene, 1-eicosen and the like. Among these, α-olefins having 3 to 8 carbon atoms such as propylene, 1-butene, 1-hexene and 1-octene are preferable, and propylene is more preferable.

The copolymer (S) contains a structural unit derived from at least one type of α-olefin (B) having 3 to 20 carbon atoms, and two or more types of α-olefin (B) having 3 to 20 carbon atoms. It may contain a structural unit derived from.

Examples of the non-conjugated polyene (C) include 5-vinyl-2-norbornene (VNB), norbornadiene, 1,4-hexadiene, and dicyclopentadiene. Among these, the non-conjugated polyene (C) preferably contains VNB, and the non-conjugated polyene (C) is VNB because it is highly available, has good crosslinkability, and easily improves the heat resistance of the composition. Is more preferable.

The copolymer (S) contains a structural unit derived from at least one non-conjugated polyene (C), and may contain a structural unit derived from two or more types of non-conjugated polyene (C).
The copolymer (S) can further have a structural unit derived from a non-conjugated polyene (D) containing only one partial structure selected from the formulas (I) and (II) in the molecule.

Examples of the non-conjugated polyene (D) include 5-ethylidene-2-norbornene (ENB), 5-methylene-2-norbornene, 5- (2-propenyl) -2-norbornene, and 5- (3-butenyl)-. 2-norbornene, 5- (1-methyl-2-propenyl) -2-norbornene, 5- (4-pentenyl) -2-norbornene, 5- (1-methyl-3-butenyl) -2-norbornene, 5- (5-Hexenyl) -2-norbornene, 5- (1-methyl-4-pentenyl) -2-norbornene, 5- (2,3-dimethyl-3-butenyl) -2-norbornene, 5- (2-ethyl -3-butenyl) -2-norbornene, 5- (6-heptenyl) -2-norbornene, 5- (3-methyl-5-hexenyl) -2-norbornene, 5- (3,4-dimethyl-4-pentenyl) ) -2-Norbornene, 5- (3-ethyl-4-pentenyl) -2-Norbornene, 5- (7-octenyl) -2-Norbornene, 5- (2-Methyl-6-Heptenyl) -2-Norbornene, 5- (1,2-dimethyl-5-hexenyl) -2-norbornene, 5- (5-ethyl-5-hexenyl) -2-norbornene, 5- (1,2,3-trimethyl-4-pentenyl)- 2-Norbornene can be mentioned. Among these, ENB is preferable because it is easily available and good mechanical properties can be easily obtained.
The copolymer (S) can contain a structural unit derived from at least one non-conjugated polyene (D), and may contain a structural unit derived from two or more types of non-conjugated polyene (D). ..

As a requirement (i), in the copolymer (S), the molar ratio (constituent unit derived from ethylene (A) / constituent unit derived from α-olefin (B) having 3 to 20 carbon atoms) is 40/60 to 99. It is .9 / 0.1, preferably 50/50 to 90/10, more preferably 55/45 to 85/15, and even more preferably 55/45 to 78/22. Such a copolymer (S) is preferable because it has excellent mechanical strength and flexibility.

As requirement (ii), the content of the non-conjugated polyene (C) -derived constituent unit in 100% by mass of the copolymer (S) (that is, in the total content of all the constituent units in 100% by mass) is 0.07. It is 10% by mass, preferably 0.1 to 8.0% by mass, and more preferably 0.5 to 5.0% by mass. Such a copolymer (S) is preferable because the crosslinked product obtained from the composition of the present invention has sufficient hardness and excellent mechanical properties, and exhibits a high crosslinking rate. Therefore, it is preferable.

The content of the structural unit derived from the non-conjugated polyene (D) in 100% by mass of the copolymer (S) is usually 0 to 20% by mass, preferably 0 to 8% by mass.
The content ratio of the structural units derived from ethylene (A), α-olefin (B), non-conjugated polyene (C), and non-conjugated polyene (D) in the copolymer (S) shall ^{be determined by 13} C-NMR. Can be done.

_{The Mooney viscosity ML (1 + 4)} of the copolymer (S) at 125 ° C. is preferably 5 to 100, more preferably 20 to 95, and even more preferably 50 to 90. The copolymer (S) having the Mooney viscosity in the above range tends to have good processability and fluidity, exhibit excellent rubber physical characteristics, and exhibit good post-treatment quality (ribbon handleability).

Mooney viscosity is measured according to JIS K6300 (1994) using a Mooney viscometer (SMV202 type manufactured by Shimadzu Corporation).
The intrinsic viscosity [η] of the copolymer (S) measured in 135 ° C. decalin is preferably 0.1 to 5 dL / g, more preferably 0.5 to 5.0 dL / g, still more preferably 0.9. It is ~ 4.0 dL / g. The copolymer (S) having the ultimate viscosity [η] in the above range tends to be excellent in molding processability.

The ultimate viscosity [η] is specifically measured as follows. About 20 mg of the copolymer (S) is dissolved in 15 mL of decalin, and the specific viscosity η _sp is measured in an oil bath at 135 ° C. After diluting with 5 mL of decalin solvent added to this decalin solution, the specific viscosity η _sp was measured in the same manner. _{This dilution operation is repeated twice more, and the value of η sp} / C when the concentration (C) is extrapolated to 0 is adopted as the ultimate viscosity.
[Η] = lim (η _sp / C) (C → 0)

<< Method for producing ethylene / α-olefin / non-conjugated polyene copolymer (S) >>
The ethylene / α-olefin / non-conjugated polyene copolymer (S) according to the present invention includes ethylene (A), α-olefin (B) having 3 to 20 carbon atoms, non-conjugated polyene (C), and if necessary. It is obtained by copolymerizing a monomer containing a non-conjugated polyene (D). The copolymer (S) may be prepared by any production method, but is preferably obtained by copolymerizing the monomer in the presence of a metallocene compound, and is a catalyst system containing a metallocene compound. It is more preferable that the monomer is obtained by copolymerizing in the presence of the monomer. Specifically, the copolymer (S) can be produced, for example, by adopting the method described in the metallocene catalyst described in International Publication No. 2015/122495.

<< Crystalline olefin polymer (G) >>
A crystalline olefin polymer which is one of the components contained in the copolymer composition according to the present invention [hereinafter, may be referred to as "polymer (G)". ] Is a homopolymer or copolymer of an α-olefin having 2 to 20 carbon atoms and a crystalline polymer.

In the present invention, the crystalline polymer is a polymer having a melting point.
Specific examples of the α-olefin constituting the crystalline olefin polymer (G) include ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, and 3-methyl-. Examples thereof include 1-pentene, 4-methyl-1-pentene and 5-methyl-1-hexene.

Specific examples of the crystalline olefin polymer (G) according to the present invention include the following (co) polymers.
(1) A homopolymer of ethylene and a copolymer of ethylene and other α-olefins of 10 mol% or less or vinyl monomers such as vinyl acetate and ethyl acrylate, more specifically, high-pressure low-density polyethylene (HP). -LDPE), linear low density polyethylene (LLDPE), medium density polyethylene, high density polyethylene (HDPE), ethylene / vinyl acetate copolymer (EVA), ethylene / acrylic acid copolymer and other ethylene-based polymers. ..
(2) Propylene such as a homopolymer of propylene, a random copolymer of propylene and 10 mol% or less of other α-olefins, and a block copolymer of propylene and 30 mol% or less of other α-olefins. It is a system polymer and is also generally called homo, random, or block type polypropylene.
(3) A 1-butene polymer such as a homopolymer of 1-butene and a random copolymer of 1-butene and another α-olefin of 10 mol% or less.
(4) Examples thereof include a homopolymer of 4-methyl-1-pentene and a random copolymer of 4-methyl-1-pentene and another α-olefin of 20 mol% or less.

These crystalline olefin polymers (G) can be used alone or in combination of two or more.
Among these crystalline olefin polymers (G), ethylene-based polymers are preferable, and high-pressure low-density polyethylene (HP-LDPE) is particularly preferable.
The ethylene polymer usually has a melt flow rate (MFR) of 0.1 to 100 g / 10 minutes, more preferably 0.5 to 80 g / 10 minutes.

《Carbon Black (L)》
Carbon black (L), which is one of the components contained in the copolymer composition of the present invention, is a kind of known rubber reinforcing agent blended in the rubber composition, and is an inorganic substance usually called carbon black. Is.

Specific examples of the carbon black (L) according to the present invention include Asahi # 55G, Asahi # 60G, Asahi # 60UG (all manufactured by Asahi Carbon Co., Ltd.), and Seast (V, SO, 116, 3, 6). , 9, SP, TA, etc.) carbon black (manufactured by Tokai Carbon Co., Ltd.), and these carbon blacks are surface-treated with a silane coupling agent or the like.

<< Fatty acid amide (M) >>
The fatty acid amide (M), which is one of the components contained in the copolymer composition of the present invention, is a higher fatty acid amide, and specifically, stearoamide, oxystearoamide, oleylamide, erucic acid amide, Monoamides of higher fatty acids such as laurylamide, palmititylamide, behenamide, methylolamide; higher fatty acids such as methylene bis stearoamide, ethylene bis stearoamide, ethylene bis oleylamide, ethylene bis laurylamide Diamides; Complex amides of higher fatty acids such as stearyl oleyl amide, N-stearyl elquamid, N-oleyl palmitoamide; Plastrodin ^TM (manufactured by Fujisawa Yakuhin Kogyo Co., Ltd.), Plastrodin S ^TM (Fujisawa Yakuhin Kogyo Co., Ltd.) Examples include special fatty acids marketed under trade names such as (manufactured by Co., Ltd.).

<Ethylene / α-olefin / non-conjugated polyene copolymer composition>
In the copolymer composition of the present invention, the amount of the crystalline olefin polymer (G) is more than 10 parts by mass to 30 parts by mass with respect to 100 parts by mass of the copolymer (S) and the copolymer (S). It is preferably in the range of 15 to 25 parts by mass, more preferably 17 to 23 parts by mass, and the above carbon black (L) in the range of 10 to 300 parts by mass, preferably 30 to 200 parts by mass, more preferably 50 to 180 parts by mass. include.

The copolymer composition of the present invention contains the crystalline olefin polymer (G) and carbon black (L) in the above range, and thus has excellent injection moldability and excellent desorption from the mold. Therefore, the obtained molded product has a good appearance without tearing in shape.

In the copolymer composition of the present invention, in addition to the crystalline olefin polymer (G) and carbon black (L), the fatty acid amide (M) is added in an amount of 0.1 to 10 parts by mass, more preferably 0.2 to 10 parts by mass. It may be contained in the range of 8 parts by mass, more preferably 0.5 to 6 parts by mass.

In addition to the above-mentioned copolymer (S), crystalline olefin polymer (G), carbon black (L) and the above-mentioned fatty acid amide (M), the copolymer composition of the present invention contains other components, if necessary. Can be blended within a range that does not impair the effects of the present invention. Other components include, for example, polymers, cross-linking agents, cross-linking aids, vulcanization accelerators, vulcanization aids, inorganic fillers. Contains at least one selected from softeners, anti-aging agents (stabilizers), processing aids, activators, hygroscopic agents, heat-resistant stabilizers, weather-resistant stabilizers, antistatic agents, colorants, lubricants, thickeners, etc. You may. Also. Each polymer and additive may be used alone or in combination of two or more. Further, if necessary, known foaming agents, foaming aids, colorants, dispersants, flame retardants and the like can also be used as other components.

<Crosslinking agent, crosslinking aid, vulcanization accelerator and vulcanization aid>
Examples of the cross-linking agent include rubbers such as organic peroxides, phenolic resins, sulfur compounds, hydrosilicone compounds, amino resins, quinone or derivatives thereof, amine compounds, azo compounds, epoxy compounds and isocyanate compounds. Examples thereof include cross-linking agents generally used for cross-linking. Of these, organic peroxides and sulfur compounds (hereinafter also referred to as "vulcanizing agents") are suitable.

Examples of the organic peroxide include dicumyl peroxide (DCP), di-tert-butyl peroxide, 2,5-di- (tert-butylperoxy) hexane, and 2,5-dimethyl-2,5-di-(. tert-butylperoxy) hexane, 2,5-dimethyl-2,5-di- (tert-butylperoxy) hexin-3, 1,3-bis (tert-butylperoxyisopropyl) benzene, 1,1-bis (tert) -Butylperoxy) -3,3,5-trimethylcyclohexane, n-butyl-4,4-bis (tert-butylperoxy) valerate, benzoyl peroxide, p-chlorobenzoyl peroxide, 2,4-dichlorobenzoyl peroxide, tert- Examples thereof include butylperoxybenzoate, ert-butylperoxyisopropyl carbonate, diacetylperoxide, lauroyl peroxide and tert-butylcumyl peroxide.

When an organic peroxide is used as the cross-linking agent, the amount thereof in the copolymer composition is generally 0.1 to 25 parts by mass, preferably 0.% by mass, based on 100 parts by mass of the copolymer (S). It is 2 to 20 parts by mass, more preferably 0.5 to 15 parts by mass. When the blending amount of the organic peroxide is within the above range, the copolymer composition exhibits excellent cross-linking properties without blooming on the surface of the obtained molded product, which is preferable.

When an organic peroxide is used as the cross-linking agent, it is preferable to use a cross-linking aid in combination. Examples of the cross-linking aid include sulfur; a quinone-dioxym-based cross-linking aid such as p-quinone dioxime; an acrylic cross-linking aid such as ethylene glycol dimethacrylate and trimethylpropantrimethacrylate; diallyl phthalate and triallyl isocyanurate. Allyl-based cross-linking aids such as; Maleimide-based cross-linking aids; Divinylbenzene; Zinc oxide (for example, ZnO # 1 and zinc oxide 2 types (JIS standard (K-1410)), manufactured by Huxitec Co., Ltd.), magnesium oxide, etc. Examples thereof include metal oxides such as active zinc white (for example, zinc oxide such as "META-Z102" (trade name; manufactured by Inoue Lime Industry Co., Ltd.)).

When a cross-linking aid is used, the blending amount of the cross-linking aid in the copolymer composition is usually 0.5 to 10 mol, preferably 0.5 to 7 mol, based on 1 mol of the organic peroxide. It is preferably 1 to 6 mol.

Examples of the sulfur-based compound (sulfurizing agent) include sulfur, sulfur chloride, sulfur dichloride, morpholine disulfide, alkylphenol disulfide, tetramethylthiuram disulfide, and selenium dithiocarbamate.

When a sulfur-based compound is used as the cross-linking agent, the amount thereof in the copolymer composition is usually 0.1 to 10 parts by mass, preferably 0.2 with respect to 100 parts by mass of the copolymer (S). It is ~ 7.0 parts by mass, more preferably 0.5 to 5.0 parts by mass. When the blending amount of the sulfur-based compound is within the above range, there is no bloom on the surface of the obtained molded product, and the copolymer composition exhibits excellent cross-linking properties.
When a sulfur-based compound is used as the cross-linking agent, it is preferable to use a vulcanization accelerator in combination.

Examples of the sulfide accelerator include N-cyclohexyl-2-benzothiazolesulfenamide, N-oxydiethylene-2-benzothiazolesulfenamide, N, N'-diisopropyl-2-benzothiazolesulfenamide, 2 -Mercaptobenzothiazole (for example, Sunseller M (trade name; manufactured by Sanshin Chemical Industry Co., Ltd.)), 2- (4-morpholinodithio) penzothiazole (for example, Noxeller MDB-P (trade name; manufactured by Ouchi Shinko Chemical Industry Co., Ltd.)) (Manufactured by)), 2- (2,4-dinitrophenyl) mercaptobenzothiazole, 2- (2,6-diethyl-4-morpholinothio) benzothiazole and dibenzothiazyldisulfide (for example, Sunseller DM (trade name; 3). (Shin Kagaku Kogyo Co., Ltd.))) and other thiazole-based sulfurization accelerators; guanidine-based sulfurization accelerators such as diphenylguanidine, triphenylguanidine and diorsotrilguanidine; Sulfenamide-based sulphurization accelerator; imidazoline-based sulphurization accelerator such as 2-mercaptoimidazolin; tetramethylthiuram monosulfide (for example, Sunseller TS (trade name; manufactured by Sanshin Chemical Industry Co., Ltd.)), tetramethylsulfur disulfide (for example, , Suncella TT (trade name; manufactured by Sanshin Chemical Industry Co., Ltd.), tetraethylthiuram disulfide (for example, Suncella TET (trade name; manufactured by Sanshin Chemical Industry Co., Ltd.)), tetrabutylthium disulfide (for example, Suncella TBT (trade name; manufactured by Sanshin Chemical Industry Co., Ltd.)). Sulfur-based sulfide accelerators such as (Sanshin Chemical Industry Co., Ltd.)) and dipentamethylene thiuram tetrasulfide (for example, Sunseller TRA (trade name; manufactured by Sanshin Chemical Industry Co., Ltd.)); Zinc dimethyldithiocarbamate, Zinc diethyldithiocarbamate , Zinc dibutyldithiocarbamate (eg, Sunseller PZ, Sunseller BZ and Sunseller EZ (trade name; manufactured by Sanshin Chemical Industry Co., Ltd.)) and dithioate-based sulfurization accelerators such as telluryl diethyldithiocarbamate; ethylenethiourea (eg, Sunseller). BUR (trade name; manufactured by Sanshin Chemical Industry Co., Ltd.), Sunseller 22-C (trade name; manufactured by Sanshin Chemical Industry Co., Ltd.)), N, N'-diethylthiourea and N, N'-dibutylthiourea, etc. Sulfur accelerators; examples include zantate-based sulfurization accelerators such as zinc dibutylxatogenate.

When a vulcanization accelerator is used, the blending amount of these vulcanization accelerators in the copolymer composition is generally 0.1 to 20 parts by mass, preferably 0.1 to 20 parts by mass with respect to 100 parts by mass of the copolymer (S). It is 0.2 to 15 parts by mass, more preferably 0.5 to 10 parts by mass. When the blending amount of the vulcanization accelerator is within the above range, the copolymer composition exhibits excellent cross-linking properties without blooming on the surface of the obtained molded product. When a sulfur-based compound is used as the cross-linking agent, a vulcanization aid can be used in combination.

Examples of the sulfide aid include zinc oxide (for example, ZnO # 1 and zinc oxide 2 types, manufactured by Huxitec Co., Ltd.), magnesium oxide, and active zinc oxide (for example, "META-Z102" (trade name; Inoue lime)). Zinc oxide) such as (manufactured by Kogyo Co., Ltd.).

When a vulcanization aid is used, the blending amount of the vulcanization aid in the ethylene-based copolymer composition is usually 1 to 20 parts by mass with respect to 100 parts by mass of the copolymer (S).

<Softener>
Specific examples of the softening agent according to the present invention include petroleum-based products such as process oils, lubricating oils, paraffin oils, liquid paraffins, petroleum asphalt, vaseline, liquid ethylene / propylene copolymers, and liquid ethylene / 1-butene copolymers. Softeners; hydrocarbon-based softeners such as coal tar; fatty oil-based softeners such as paraffin oil, flaxseed oil, rapeseed oil, soybean oil, and coconut oil; waxes such as beeswax and carnauba wax; Fatty acids such as stearic acid, barium stearate, calcium stearate or salts thereof; naphthenic acid, pine oil, rosin or derivatives thereof; synthetic polymer substances such as terpene resin, petroleum resin, kumaron inden resin; dioctylphthalate, dioctyl adipate, etc. Ester-based softeners; In addition, microcrystallin wax, liquid polybutadiene, modified liquid polybutadiene, hydrocarbon-based synthetic lubricating oil, tall oil, sub (factis), etc. are mentioned, and petroleum-based softeners are preferable, and both liquid ethylene and propylene are preferable. Polymers, liquid ethylene / 1-butene copolymers and process oils are particularly preferred.
These softeners are not limited to one type, and two or more types may be used.

The blending amount of the softening agent in the copolymer composition is generally 2 to 100 parts by mass, preferably 10 to 100 parts by mass with respect to 100 parts by mass of the copolymer (S).

<Inorganic filler>
As a specific example of the inorganic filler according to the present invention, one or more types such as light calcium carbonate, heavy calcium carbonate, talc, clay and the like are used, and among these, "Whiten SB" (trade name). Shiraishi Calcium Co., Ltd.) and other heavy calcium carbonates are preferable.

When the copolymer composition contains an inorganic filler, the blending amount of the inorganic filler is usually 2 to 50 parts by mass, preferably 5 to 50 parts by mass with respect to 100 parts by mass of the copolymer S). It is a mass part. When the blending amount is within the above range, the kneading processability of the copolymer composition is excellent.

<Anti-aging agent (stabilizer)>
By adding an anti-aging agent (stabilizer) to the copolymer composition according to the present invention, the life of the molded product to be formed can be extended. Examples of such an anti-aging agent include conventionally known anti-aging agents such as amine-based anti-aging agents, phenol-based anti-aging agents, and sulfur-based anti-aging agents.

Further, as an anti-aging agent, an aromatic secondary amine-based anti-aging agent such as phenylbutylamine, N, N-di-2-naphthyl-p-phenylenediamine; dibutylhydroxytoluene, tetrakis [methylene (3,5-di-) t-Butyl-4-hydroxy) hydrocinnamate] Phenolic anti-aging agents such as methane; thioethers such as bis [2-methyl-4- (3-n-alkylthiopropionyloxy) -5-t-butylphenyl] sulfide Anti-aging agent; Dithiocarbamate-based anti-aging agent such as nickel dibutyldithiocarbamate; 2-mercaptobenzoylimidazole, 2-mercaptobenzoimidazole, 2-mercaptobenzoimidazole zinc salt, dilaurylthiodipropionate, distearylthio There are sulfur-based anti-aging agents such as dipropionate.

These antioxidants can be used alone or in combination of two or more, and the blending amount thereof is usually 0.3 to 10 parts by mass with respect to 100 parts by mass of the copolymer (S). , Preferably 0.5 to 7.0 parts by mass. Within such a range, there is no bloom on the surface of the molded product obtained from the crosslinked product of the copolymer composition, and the occurrence of cross-linking inhibition can be further suppressed.

<Processing aid>
As the processing aid according to the present invention, those generally blended in rubber as a processing aid can be widely used.

Specific examples of the processing aid include ricinoleic acid, stearic acid, palmitic acid, lauric acid, barium stearate, zinc stearate, calcium stearate, esters and the like. Of these, stearic acid is preferred.

The blending amount of the processing aid is usually 10 parts by mass or less, preferably 8.0 parts by mass or less, based on 100 parts by mass of the copolymer (S) contained in the copolymer composition.

<Activator>
Specific examples of the activator include amines such as di-n-butylamine, dicyclohexylamine and monoelanolamine; zinc compounds of diethylene glycol, polyethylene glycol, lecithin, trialilute melilate, aliphatic carboxylic acid or aromatic carboxylic acid. Activators; Zinc peroxide modifiers; Cutadecyltrimethylammonium bromide, synthetic hydrotalcites, special quaternary ammonium compounds and the like.

When the activator is contained, the blending amount thereof is usually 0.2 to 10 parts by mass, preferably 0.3 to 5 parts by mass with respect to 100 parts by mass of the copolymer (S).

<Hydraulic agent>
Specific examples of the hygroscopic agent include calcium oxide, silica gel, sodium sulfate, molecular sieve, zeolite, white carbon and the like.

When the hygroscopic agent is contained, the blending amount thereof is usually 0.5 to 15 parts by mass, preferably 1.0 to 12 parts by mass with respect to 100 parts by mass of the copolymer (S).

<Crosslinked product of copolymer composition>
The crosslinked product of the copolymer composition of the present invention is obtained by cross-linking the above-mentioned copolymer composition of the present invention.
In order to cross-link the copolymer composition of the present invention, a cross-linking agent such as an organic peroxide is added to the above-mentioned copolymer composition, and then the copolymer composition is cross-linked.

As a method for cross-linking the copolymer composition of the present invention, after mixing the copolymer composition with the organic peroxide or the like, a conventionally known kneading device such as an open mixing roll or a non-open Banbury mixer can be used. Extruders, kneaders, continuous mixers, etc. are used. Of these, a non-open type kneading device is preferable, and the kneading is preferably performed in an atmosphere of an inert gas such as nitrogen gas or carbon dioxide gas.

<< Use of copolymer composition >>
The copolymer composition of the present invention is molded by a commonly used molding method, for example, an injection molding method, an extrusion molding method, a hollow molding method, a compression molding method, or the like. Applications include automobile parts (weather strips, ceiling materials, interior seats, bumper moldings, side moldings, air spoilers, air duct hoses, cup holders, side brake grips, shift knob covers, seat adjustment knobs, flapper door seals, wire harness glomets, rack and Pinion boots, suspension cover boots, glass guides, inner belt line seals, roof guides, trunk lid seals, molded quarter wind gaskets, corner moldings, glass encapsulation, hood seals, glass run channels, secondary seals, clean side ducts, Various packings, etc.), civil engineering / building material parts (water blocking materials, joint materials, building window frames, etc.), sports equipment (golf clubs, tennis racket grips, etc.), industrial parts (hose tubes, gaskets, etc.), It is used as a material in a wide range of fields such as home appliance parts (hoses, packings, etc.), medical equipment parts, electric wires, and miscellaneous goods.

Hereinafter, the present invention will be described in more detail based on Examples, but the present invention is not limited to these Examples.
The ethylene / α-olefin / non-conjugated polyene copolymer (S) used in Examples and Comparative Examples is shown below.

[Production Example 1] Production of Ethylene / α-olefin / Vinyl Norbornene Copolymer (S-1) Using a continuous polymerization apparatus, ethylene / propylene / 5-vinyl-2-norbornene (VNB) can be used together as follows. The polymer (S-1) was produced.

In a polymerization reactor having a volume of 300 liters, 58.3 L / hr of hexane solvent dehydrated and purified from line 1, 4.5 mmol / hr of triisobutylaluminum (TiBA) from line 2, (C ₆ H ₅ ) ₃ CB (C) ₆ F ₅ ) ₄ was continuously supplied at 0.150 mmol / hr, and di (p-tolyl) methylene (cyclopentadienyl) (octamethyloctahydrodibenzofluorenyl) zirconium dichloride was continuously supplied at 0.030 mmol / hr. At the same time, ethylene was continuously supplied into the polymerization reactor at 6.6 kg / hr for ethylene, 9.3 kg / hr for propylene, 18 liters / hr for hydrogen, and 340 g / hr for VNB, and the polymerization temperature was 87 ° C. , The copolymerization was carried out under the conditions of a total pressure of 1.6 MPaG and a residence time of 1.0 hour.

The ethylene / propylene / VNB copolymer solution produced by the polymerization reactor is continuously discharged at a flow rate of 88.0 liters / hr and raised to a temperature of 170 ° C. (pressure rises to 4.1 MPaG). It was supplied to the phase separator. At this time, ethanol, which is a polymerization inhibitor, was continuously introduced into the discharge line in an amount of 0.1 mol times that of TiBA in the liquid component extracted from the polymerization reactor.

In the phase separator, a solution of ethylene / propylene / VNB copolymer is mixed with a concentrated phase (lower phase portion) containing most of the ethylene / propylene / VNB copolymer and a dilute phase (upper phase portion) containing a small amount of polymer. ) And separated.

The separated concentrated phase is led to the heat exchanger K at 85.4 liters / hr and further into the hopper where the solvent is evaporated and separated to give the ethylene / propylene / VNB copolymer 7.8 kg / hr. Obtained in quantity.

The physical characteristics of the obtained copolymer (S-1) were measured by the method described above. _{The Mooney viscosity ML (1 + 4) of the} copolymer (S-1) at 125 ° C. is 69, the molar ratio (ethylene unit / propylene unit) is 70/30, and the content ratio of VNB unit is 1.4 mass. The intrinsic viscosity [η] measured in 135 ° C. decalin was 2.8 dL / g. The molecular weight distribution of the obtained copolymer (S-1) was bimodal.

[Manufacturing Example 2]
<Polymerization of softener component>
The softener component is polymerized using a reactor with a SUS stirrer having a volume of 300 L, keeping the temperature at 80 ° C., setting the liquid level to 100 L, hexane at 52.0 kg / h, ethylene at 12.0 kg / h, and propylene at 12.0 kg / h. 7.7 kg and hydrogen at a rate of 1600 NL / h with [N- (1,1-dimethylethyl) -1,1-dimethyl-1-[(1,2,3,3A, 8A-η) as the main catalyst. -1,5,6,7-tetrahydro-2-methyl-S-indacene-1-yl] silaneaminated (2-) -κN] [(1,2,3,4-η) -1,3- Pentadien] -titanium at 0.09 mmol / h, cocatalyst (C ₆ H ₅ ) ₃ CB (C ₆ F ₅ ) ₄ at 0.36 mmol / h, and TIBA as organic aluminum compound at 2.0 mmol / h continuously. It was supplied to a reactor to obtain a polymer solution of an ethylene and propylene copolymer (softening agent component). The main catalyst was obtained by synthesizing according to the method described in International Publication No. 98/49212. A softening agent component was obtained from the obtained polymerization solution by flash drying. The molar ratio of the softener (ethylene unit / propylene unit) was 70/30, and the ultimate viscosity [η] measured in decalin at 135 ° C. was 0.2 dL / g.

As the crystalline olefin polymer (G) used in Examples and Comparative Examples, the following high-pressure low-density polyethylene was used.
Made by Nippon Unicar Co., Ltd. Product name; DND2450 MFR = 1.30 g / 10 minutes, density = 0.920 g / cm ³ .

[Physical characteristics of uncrosslinked copolymer composition]
(Mooney viscosity (ML _{(1 + 4)} 100 ° C.))
The Mooney viscosity (ML _{(1 + 4)} 100 ° C.) at 100 ° C. was measured under the condition of 100 ° C. using a Mooney viscometer (SMV202 type manufactured by Shimadzu Corporation) in accordance with JIS K6300.

<Physical characteristics of molded product (crosslinked product)>
(Tensile breaking point stress, tensile breaking point elongation)
The tensile breaking point stress and the tensile breaking point elongation of the sheet were measured by the following methods.
A sheet is punched out to prepare a No. 3 dumbbell test piece described in JIS K 6251 (1993), and this test piece is used at a measurement temperature of 25 ° C. and tension according to the method specified in JIS K 6251 (3). A tensile test was carried out under the condition of a speed of 500 mm / min, and the modulus (M100), the tensile breaking point stress (TB) and the tensile breaking point elongation (EB) at 100% elongation were measured.

(Durometer A hardness)
According to JIS K 6253, the hardness of the sheet (type A durometer, HA) was measured by stacking flat portions to a thickness of about 12 mm using six 2 mm sheet-shaped molded products having a smooth surface.

(Injection moldability)
Using an injection molding die, the ethylene / α-olefin / non-conjugated polyene copolymer composition (formulation 2) obtained in Examples and Comparative Examples is injected at a mold temperature of 170 ° C. for 5 minutes or Hold for 10 minutes, the bellows part is connected to the large diameter end and the small diameter end, and the peaks and valleys appear alternately in the axial direction. A boot-shaped molded product having a thickness of 3 mm and having [25 mm, 30 mm, 15 mm] and three valleys [diameters: 69 mm, 65 mm, 49 mm] was obtained.
When the molded rubber boot-shaped crosslinked molded product was taken out from the mold, it was marked with x if even a part of the rubber boot-shaped crosslinked molded product was torn, and marked with ○ if it could be taken out without tearing.

[Example 1]
Polymer (S-1) obtained in Production Example 1 using MIXTRON BB MIXER (manufactured by Kobe Steel Co., Ltd., BB-4 type, volume 2.95 L, rotor 4WH): 100 parts by mass and a copolymer (S-1) With respect to 100 parts by mass, the softening agent obtained in Production Example 2 (mixture containing 15 parts by mass of a liquid ethylene / propylene copolymer: 115 parts by mass, the high-pressure method low-density polyethylene (S-1) 20 parts by mass of DND2450), 5 parts by mass of zinc oxide (ZnO # 1) as a cross-linking aid, 2 parts by mass of stearic acid as a processing aid, and 133 parts by mass of carbon black (trade name: Asahi # 60UG, manufactured by Asahi Carbon Co., Ltd.). 82 parts by mass of paraffin-based process oil (trade name: Diana Process Oil PW-380 manufactured by Idemitsu Kosan Co., Ltd.) as a softener, and 1 mass of phenol-based antioxidant (trade name: Irganox 1010 BASF Japan Co., Ltd.) as an anti-aging agent. 2 parts by mass of 2-mercaptobenzoimidazole (trade name: Sandant MB manufactured by Sanshin Kagaku Kogyo Co., Ltd.) as an anti-aging agent, and fatty acid amide (trade name: Stractol WB212: calcium soap & saturated fatty acid amide mixture) as a lubricant S & S Japan Co., Ltd. (Manufactured) was blended in an amount of 1 part by mass and then kneaded to obtain Formulation 1.

The kneading conditions at the time of preparing the formulation 1 were a rotor rotation speed of 50 rpm, a floating weight pressure of 3 kg / cm ² , a kneading time of 5 minutes, and a kneading discharge temperature of 170 ° C.
The Mooney viscosity ML _{(1 + 4) of} Formulation 1 was measured at 100 ° C. using a Mooney viscometer (SMV202 type manufactured by Shimadzu Corporation) according to JIS K6300 (1994).

Next, after confirming that the temperature of the formulation 1 was 40 ° C., a 6-inch roll was used to add dicumyl peroxide as a cross-linking agent to the formulation 1 [trade name: Parkmill D-40 (40 mass of dicumyl peroxide). %) 12.5 parts by mass of Nippon Oil & Fat Co., Ltd. and 3 parts by mass of trimethylolpropane trimethacrylate (trade name: Hicross M Seiko Kagaku Co., Ltd.) as a cross-linking aid are added and kneaded to obtain Formulation 2. rice field.

The kneading conditions at the time of preparing the formulation 2 are that the roll temperature is the front roll / rear roll = 50 ° C./50 ° C., the roll peripheral speed is the front roll / rear roll = 18 rpm / 15 rpm, and the roll gap is 2 mm, and the kneading time is 8 minutes. The mixture was divided into two to obtain the formulation 2.
The compound 2 was pressed at 170 ° C. for 10 minutes using a press molding machine to prepare a crosslinked sheet having a thickness of 2 mm. The physical properties of the obtained crosslinked sheet were evaluated by the method described above.
The evaluation results are shown in Table 1.

[Comparative Example 1]
Same as in Example 1 except that the high pressure method low density polyethylene (DND2450) is not blended in place of the formulation used in Example 1 and the type and blending amount of the additive are changed to the amounts shown in Table 1. To obtain a crosslinked sheet, the physical properties were evaluated by the method described above.
The evaluation results are shown in Table 1.

[Comparative Example 2]
Same as in Example 1 except that the high pressure method low density polyethylene (DND2450) is not blended in place of the formulation used in Example 1 and the type and blending amount of the additive are changed to the amounts shown in Table 1. To obtain a crosslinked sheet, the physical properties were evaluated by the method described above.
The evaluation results are shown in Table 1.

[Example 2]
Instead of the formulation used in Example 1, zinc oxide (ZnO # 1) was used as a fatty acid amide in active zinc flower (trade name META-Z102 manufactured by Inoue Lime Industry Co., Ltd.) (trade name Stratol WB212). : Calcium soap & saturated fatty acid amide mixture (manufactured by S & S Japan) is replaced with Stratktor WB16 (calcium soap & saturated fatty acid amide mixture, trade name: S & S Japan), and the amount of high-pressure low-density polyethylene and additives is changed. A crosslinked sheet was obtained in the same manner as in Example 1 except that the amount was changed to the amount shown in Table 1, and the physical properties were evaluated by the method described above.
The evaluation results are shown in Table 1.

[Example 3]
Instead of the formulation used in Example 1, zinc oxide (ZnO # 1) was used as a fatty acid amide in active zinc flower (trade name META-Z102 manufactured by Inoue Lime Industry Co., Ltd.) (trade name Stratol WB212). : Calcium soap & saturated fatty acid amide mixture (manufactured by S & S Japan) is replaced with Stratktor WB16 (calcium soap & saturated fatty acid amide mixture, trade name: S & S Japan), and the amount of high-pressure low-density polyethylene and additives is changed. A crosslinked sheet was obtained in the same manner as in Example 1 except that the amount was changed to the amount shown in Table 1, and the physical properties were evaluated by the method described above.
The evaluation results are shown in Table 1.

[Comparative Example 3]
A crosslinked sheet was obtained in the same manner as in Example 1 except that the amount of the additive compounded was changed to the amount shown in Table 1 in place of the compound used in Example 2, and the physical properties were evaluated by the method described above.
The evaluation results are shown in Table 1.

Claims (5)

Ethylene / α-olefin / non-conjugated polyene copolymer (S) and the ethylene / α-olefin / non-conjugated polyene copolymer containing ethylene, α-olefin having 3 or more carbon atoms and non-conjugated polyene as constituent units. (S) Ethylene characterized by containing more than 10 parts by mass to 30 parts by mass of the crystalline olefin polymer (G) and 10 to 300 parts by mass of carbon black (L) with respect to 100 parts by mass of (S). α-Ethylene / non-conjugated polyene copolymer composition. The ethylene / α-olefin / non-conjugated polyene copolymer composition according to claim 1, further comprising a fatty acid amide (M) in the range of 0.1 to 10 parts by mass. The ethylene / α-olefin / non-conjugated polyene copolymer (S) is characterized by being an ethylene / α-olefin / non-conjugated polyene copolymer (S) satisfying the following requirements (i) to (vi). The ethylene / α-olefin / non-conjugated polyene copolymer composition according to claim 1 or 2.
(I) The molar ratio (constituent unit derived from ethylene (A) / constituent unit derived from α-olefin (B) having 3 to 20 carbon atoms) is 40/60 to 99.9 / 0.1.
(Ii) The content ratio of the structural unit derived from the non-conjugated polyene (C) is in the range of 0.07 to 10% by mass.
_{(Iii) Mooney viscosity ML (1 + 4} ) at 125 ° C. is in the range of 5-100.
(Iv) The ultimate viscosity [η] measured in 135 ° C. decalin is in the range of 0.1 to 5 dL / g. The ethylene / α-olefin according to any one of claims 1 to 3, wherein the α-olefin having 3 or more carbon atoms constituting the ethylene / α-olefin / non-conjugated polyene copolymer (S) is propylene. -Non-conjugated polyene copolymer composition. An injection molded product formed from the ethylene / α-olefin / non-conjugated polyene copolymer composition according to any one of claims 1 to 4.