JP2019077801A - Elastomer composition, aqueous linkable elastomer composition and method for producing the same - Google Patents

Abstract

To provide an elastomer composition capable of obtaining a molded product which can be molded and processed like a thermoplastic resin using conventional plastic processing equipment and has a very small permanent compression set like a vulcanized rubber, high oil resistance and good appearance.SOLUTION: There is provided an elastomer composition which comprises: (A) 10 to 80 pts.mass of a first propylene-based resin; (B) 20 to 90 pts.mass of an ethylene-α-olefin-based copolymer; (C) 60 to 150 pts.mass of a softening agent for a nonaromatic rubber based on 100 pts.mass of the (B); (D) 0.5 to 3 pts.mass of an organic peroxide based on 100 pts.mass of a composition composed of the (A) and (B); (E) 0.1 to 6 pts.mass of a crosslinking assistant based on 100 pts.mass of a composition composed of the (A) and (B); (F) 1 to 7 pts.mass of a silane coupling agent based on 100 pts.mass of a composition composed of the (A) and (B); and (G) 0 to 50 pts.mass of an inorganic filler based on 100 pts.mass of a composition composed of the (A) and (B).SELECTED DRAWING: None

Description

  The present invention relates to elastomeric compositions. More particularly, it relates to an elastomeric composition that can be shaped like thermoplastics using conventional plastic processing equipment and has a very low compression set, such as vulcanized rubber.

  In recent years, as a material which is a soft material having rubber elasticity and has the same molding processability as a thermoplastic resin, as an alternative material for vulcanized rubber, automobile parts, home appliance parts, electric wire coating, medical parts, It is widely used in the fields of footwear and sundries. In recent years, application to fields used in more severe environments has been actively attempted, and an elastomer composition having a very small compression set, such as a vulcanized rubber, is required. Various elastomeric compositions have been proposed for this task, but have not reached fully satisfactory levels.

JP 2002-322342 A JP 2003-183450 A

  The subject of the present invention is that it can be molded like thermoplastic resin using conventional plastic processing equipment, its compression set is very small like vulcanized rubber, its oil resistance is high, and its appearance Another object of the present invention is to provide an elastomer composition which can obtain good moldings.

  As a result of intensive studies, the present inventor has found that the above-mentioned problems can be achieved by a specific elastomer composition.

That is, the present invention
(A) 10 to 80 parts by mass of the first propylene resin;
(B) 20 to 90 parts by mass of ethylene / α-olefin copolymer;
(C) Softener for non-aromatic rubber: 60 to 150 parts by mass with respect to 100 parts by mass of (B);
(D) Organic peroxide 0.5 to 3 parts by mass with respect to 100 parts by mass of the composition consisting of (A) and (B);
(E) Crosslinking auxiliary agent 0.1 to 6 parts by mass with respect to 100 parts by mass of the composition comprising (A) and (B);
(F) Silane coupling agent 1 to 7 parts by mass with respect to 100 parts by mass of the composition consisting of (A) and (B); and (G) Inorganic filler Composition 100 consisting of (A) and (B) 0 to 50 parts by mass with respect to parts by mass;
An elastomeric composition comprising

The second invention is
(1) The (A) first propylene-based resin, the (B) ethylene / α-olefin polymer, the (E) crosslinking aid, the (F) silane coupling agent, and the (G) inorganic Melt-kneading the whole amount of the filler and 0 to the whole amount of the non-aromatic rubber softener (C),
(2) The entire amount of the (D) organic peroxide is added to the composition obtained in the step (1), and heat treatment is performed dynamically,
(3) The elastomer composition according to the first invention, which is obtained by blending the residue of (C) added in the step (1) with the composition obtained in the step (2).

  A third invention is described in the second invention, wherein the residue of (C) added in the step (1) and the (I) second propylene-based resin are blended in the step (3) The elastomeric composition of

  4th invention is an elastomer composition as described in 1st invention-3rd invention whose arithmetic mean roughness Ra of surface is 0.5-4.0 micrometers.

  The fifth invention further comprises 0.005 to 0.3 parts by mass of (H) silanol condensation catalyst with respect to 100 parts by mass of the elastomer composition according to any of the first to fourth inventions. And water-crosslinkable elastomeric compositions.

  A sixth invention is a molded article comprising the elastomer composition according to any of the first invention to the fourth invention, or the water-crosslinkable elastomer composition according to the fifth invention.

The seventh invention is
(1) (A) 10 to 80 parts by mass of the first propylene resin;
(B) 20-90 parts by mass of ethylene / α-olefin polymer;
(E) Crosslinking auxiliary agent 0.1 to 6 parts by mass with respect to 100 parts by mass of the composition comprising (A) and (B);
(F) Silane coupling agent 1 to 7 parts by mass with respect to 100 parts by mass of the composition consisting of (A) and (B); and (G) Inorganic filler Composition 100 consisting of (A) and (B) The total amount of 0 to 50 parts by mass with respect to the mass parts,
(C) Softener for aromatic rubber 0 to whole amount of 60 to 150 parts by mass with respect to 100 parts by mass of (B)
A process of melting and kneading;
(2) In the composition obtained in the step (1), 0.2 to 3 parts by mass with respect to 100 parts by mass of the composition comprising the (D) organic peroxide and the (A) and (B). Adding and heat treating dynamically;
(3) adding the residue of (C) added in the step (1) to the composition obtained in the step (2);
(4) A step of blending 0.005 to 0.3 parts by mass of the (H) silanol condensation catalyst with respect to 100 parts by mass of the elastomer composition obtained in the step (3);
(5) a step of forming the elastomer composition blended with the (H) silanol condensation catalyst in the step (4) into a molded article; and (6) a molded article formed in the step (5) with warm water Processing steps;
It is a manufacturing method of the molded article containing.

  An eighth invention relates to the seventh invention, wherein the residue of (C) added in the step (1) and the (I) second propylene-based resin are compounded in the step (3). It is a manufacturing method of a molding.

  The elastomer composition of the present invention can be molded and processed like a thermoplastic resin using conventional plastic processing equipment, and its compression set is very small like vulcanized rubber, and is excellent in oil resistance. ing. In addition, by feeding the organic peroxide to an intermediate position of the extruder, the occurrence of a cross-linked product (cross-linked gel) can be suppressed even when a large amount of organic peroxide is added, so The surface is smooth and the appearance is good. Therefore, as a material which substitutes a vulcanized rubber, it can be used suitably for packing for cars, packing for building materials, etc.

  In the present specification, the term "resin" is used as a term also including resin mixtures containing two or more resins, and resin compositions containing components other than resins. The term "above" in relation to a numerical range is used in the meaning of a certain numerical value or more than a certain numerical value. For example, 20% or more means 20% or more than 20%. The term "or less" in relation to a numerical range is used to mean a certain numerical value or less than a certain numerical value. For example, 20% or less means 20% or less than 20%. Furthermore, the symbol “to” relating to a numerical range is used in the meaning of a certain numerical value, more than a certain numerical value and less than another certain numerical value, or some other numerical value. Here, some other numerical value is larger than a certain numerical value. For example, 10-90% means 10%, more than 10% and less than 90%, or 90%.

  The elastomer composition of the present invention comprises (A) a first propylene-based resin, (B) an ethylene / α-olefin copolymer, (C) a softener for a non-aromatic rubber, (D) an organic peroxide, It contains (E) a crosslinking coagent, and (F) a silane coupling agent. The elastomer composition of the present invention preferably further comprises (G) an inorganic filler. When post-treatment with warm water, so-called water crosslinking treatment, is performed on the elastomer composition of the present invention, it is preferable to further include a (H) silanol condensation catalyst. In the present specification, an elastomer composition which contains the above-mentioned (H) silanol condensation catalyst may be referred to as a "water-crosslinkable elastomer composition". In the case of side feeding of the elastomer composition of the present invention, it is preferable to further include (I) a second propylene-based resin. Each component will be described below.

(A) First propylene-based resin:
The component (A) is a propylene resin. The component (A) contributes to heat resistance and moldability.

  The propylene-based resin is a polymer containing propylene as a main monomer, and is a propylene homopolymer, a random copolymer of propylene and a small amount of another α-olefin comonomer, and a block copolymer of propylene and an α-olefin comonomer Polymers can be mentioned.

  Examples of the above α-olefin comonomers include ethylene, 1-butene, 2-methyl-1-propene, 1-pentene, 2-methyl-1-butene, 3-methyl-1-butene, 1-hexene, 2- Ethyl-1-butene, 2,3-dimethyl-1-butene, 2-methyl-1-pentene, 3-methyl-1-pentene, 4-methyl-1-pentene, 3,3-dimethyl-1-butene, 1-heptene, methyl-1-hexene, dimethyl-1-pentene, ethyl-1-pentene, trimethyl-1-butene, methylethyl-1-butene, 1-octene, methyl-1-pentene, ethyl-1-hexene , Dimethyl-1-hexene, propyl-1-heptene, methylethyl-1-heptene, trimethyl-1-pentene, propyl-1-pentene, diethyl-1-butene , 1-nonene, 1-decene, 1-undecene, and 1-dodecene, or the like can be mentioned. Among these, ethylene, 1-butene, 1-pentene, 1-hexene and 1-octene are preferable, and ethylene, 1-butene and 1-hexene are more preferable. As said (alpha)-olefin comonomer, 1 type (s) or 2 or more types of mixtures of these can be used.

  Specific examples of the above-mentioned random copolymer of propylene and other small amount of α-olefin comonomers include, for example, propylene / ethylene random copolymer, propylene / 1-butene random copolymer, propylene / 1-hexene random copolymer Polymer, propylene 1-octene random copolymer, propylene ethylene 1-butene random copolymer, propylene ethylene 1-hexene random copolymer, propylene ethylene 1-octene random copolymer, etc. You can raise Among these, propylene / ethylene random copolymer, propylene / 1-butene random copolymer, propylene / 1-hexene random copolymer, propylene / ethylene / 1-butene random copolymer, and propylene / ethylene / 1-Hexene random copolymers are preferred.

  The block copolymer of propylene and an α-olefin comonomer is a copolymer composed of a crystalline polypropylene component and a copolymer rubber component of propylene and an α-olefin comonomer. The crystalline polypropylene component is composed of a propylene homopolymer or a random copolymer of propylene and a small amount of another α-olefin comonomer.

  From the viewpoint of heat resistance, the component (A) is preferably a propylene homopolymer or a block copolymer of propylene and an α-olefin comonomer, and the crystalline polypropylene component is a propylene homopolymer.

  As said component (A), these 1 type, or 2 or more types of mixtures can be used.

  The above component (A) is held at 230 ° C. for 5 minutes using Diamond DSC type differential scanning calorimeter of Perkin-Elmer Japan Co., Ltd., cooled to −10 ° C. at 10 ° C./min, and held at −10 ° C. for 5 minutes And the peak top melting point of the peak appearing at the highest temperature side in the second melting curve (melting curve measured in the last heating step) measured by a program of heating to 230.degree. C. at 10.degree. From the viewpoint of the properties, it may be preferably 150 ° C. or more, more preferably 160 ° C. or more. The upper limit of the peak top melting point is not particularly limited, but may be at most about 167 ° C. because it is a polypropylene resin.

  The melt mass flow rate of the above component (A) measured under the conditions of 230 ° C. and 21.18 N according to JIS K 7210: 1999 is preferably 0.1 to 20 from the viewpoint of molding processability and compression set. It may be 1000 g / 10 minutes, more preferably 0.3 to 100 g / 10 minutes.

  The compounding amount of the component (A) is usually 10 to 80 parts by mass with respect to 90 to 20 parts by mass of the following component (B), and the total of the component (A) and the component (B) is 100 parts by mass is there. The compounding amount of the component (A) is usually 80 parts by mass or less, preferably 60 parts by mass from the viewpoint of flexibility and compression set with respect to 100 parts by mass of the composition comprising the component (A) and the following component (B). It is at most 50 parts by mass, more preferably at most 50 parts by mass. On the other hand, from the viewpoint of suppressing the occurrence of crosslinked bumps and improving mechanical properties, heat resistance, and moldability, the amount is usually 10 parts by mass or more, preferably 15 parts by mass or more, and more preferably 20 parts by mass or more. In addition, the compounding quantity of a component (A) and the following component (B) can be suitably set according to the use of an elastomer composition.

  Further, as described later, in the present invention, when melt-kneading each component to obtain an elastomer composition, (I) the second polypropylene resin may be blended in the melt-kneaded composition . For example, when melt-kneading each component using a twin-screw extruder etc., it can mix | blend by side feeding (I) 2nd polypropylene resin from the latter half part of an extruder.

  As (I) 2nd polypropylene resin mix | blended, the thing similar to the 1st polypropylene resin which is the above-mentioned component (A) can be used. The amount of the (I) second polypropylene resin to be blended can be appropriately adjusted depending on the use application of the molded article. The compounding amount of the (I) second polypropylene-based resin is preferably 100 parts by mass of the composition comprising the component (A) first propylene-based resin and the component (B) ethylene / α-olefin copolymer, The amount is preferably 5 to 150 parts by mass, and more preferably 10 to 100 parts by mass.

(B) Ethylene / α-olefin copolymer:
The said component (B) is a copolymer which has ethylene and an alpha-olefin as a main. The component (B) imparts flexibility and contributes to the improvement of the compression set (reduction of the compression set).

  Examples of the above α-olefins include propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 1-dodecene, 2-methyl-1-propene, 2-methyl-1-butene And 3-methyl-1-butene, 2-ethyl-1-butene, 2,3-dimethyl-1-butene, 3-methyl-1-pentene, 4-methyl-1-pentene and the like. Among these, C3-C10 alpha-olefin is preferable. A mixture of one or more of these can be used as the α-olefin.

  The component (B) may contain, in addition to ethylene and an α-olefin, a structural unit derived from a monomer copolymerizable therewith.

  As said copolymerizable monomer, a nonconjugated diene type monomer etc. can be mentioned, for example. Examples of the non-conjugated diene-based monomer include 5-ethylidene-2-norbornene (ENB), 1,4-hexadiene, 5-methylene-2-norbornene (MNB), 1,6-octadiene, 5-methyl-1 , 4-hexadiene, 3,7-dimethyl-1,6-octadiene, 1,3-cyclopentadiene, 1,4-cyclohexadiene, tetrahydroindene, methyltetrahydroindene, dicyclopentadiene, 5-isopropylidene-2-norbornene And 5-vinyl-norbornene, dicyclooctadiene, methylene norbornene, ethylidene norbornene, norbornadiene, 1,2-butadiene, and 1,4-pentadiene. As said copolymerizable monomer, 1 type (s) or 2 or more types of mixtures of these can be used.

  Specific examples of the component (B) include, for example, high density polyethylene, low density polyethylene, linear low density polyethylene, ethylene / propylene copolymer rubber, ethylene / propylene / non-conjugated diene copolymer rubber, ethylene. 1-butene copolymer rubber, ethylene 1-butene nonconjugated diene copolymer rubber, ethylene 1-octene copolymer rubber, ethylene 1-octene nonconjugated diene copolymer rubber, ethylene propylene propylene A 1-butene copolymer rubber, an ethylene propylene 1-octene copolymer rubber, etc. can be mentioned. Among these, ethylene / 1-octene copolymer rubber and ethylene / propylene / non-conjugated diene copolymer rubber (EPDM) are preferable in terms of flexibility. As said component (B), 1 type (s) or 2 or more types of mixtures of these can be used.

  The content of the structural unit derived from ethylene in the above component (B) depends on the kind and molecular structure (such as whether it is linear or has a long chain branch) such as α-olefin copolymerized with ethylene. Depending on the amount, it may preferably be 50 to 90% by mass, more preferably 60 to 85% by mass.

The Mooney viscosity ML _{1 + 4} measured at a temperature of 125 ° C. according to ASTM D-1646 of the above component (B) is not particularly limited, but is preferably 10 or more, more preferably 20 or more from the viewpoint of compression set You may On the other hand, it may be preferably 250 or less, more preferably 150 or less from the viewpoint of molding processability.

The density of the component (B) measured in accordance with JIS K 7112: 1999 may be preferably 850 to 900 kg / m ³ , more preferably 855 to 890 kg / m ³ .

  The compounding amount of the component (B) is appropriately set according to the compounding amount of the component (A) such that the total amount of the component (A) and the component (B) is 100 parts by mass as described above be able to.

(C) Softener for non-aromatic rubber:
The component (C) is a non-aromatic rubber softener. The component (C) functions to improve moldability and flexibility.

  The non-aromatic softener for rubber is a non-aromatic mineral oil (hydrocarbon compound derived from petroleum or the like) or a synthetic oil (synthetic hydrocarbon compound), and is usually liquid or gel or gum at normal temperature. It is a state. The term "non-aromatic" as used herein means that mineral oil is not classified as aromatic in the following categories (the number of aromatic carbons is less than 30%). For synthetic oils, it means that aromatic monomers are not used.

  A mineral oil used as a softener for rubber is a combined mixture of any one or more of a paraffin chain, a naphthene ring, and an aromatic ring, and having 30 to 45% of naphthene ring carbon number is a naphthenic oil, Those with 30% or more aromatic carbons are called aromatics, and those that do not belong to naphthenes or aromatics and those with paraffinic chain carbons occupying 50% or more of the total number of carbons are paraffinic It is called and distinguished.

  Examples of the component (C) include paraffinic mineral oils such as linear saturated hydrocarbons, branched saturated hydrocarbons, and derivatives thereof; naphthenic mineral oils; hydrogenated polyisobutylene, polyisobutylene, polybutene and the like Such as synthetic oil; Commercially available examples of the component (C) include isoparaffin hydrocarbon oil "NA Solvent (trade name)" manufactured by NOF Corporation, n-paraffin process oil "Diana Process Oil PW-90" manufactured by Idemitsu Kosan Co., Ltd. Name) and “Diana Process Oil PW-380 (trade name)”, synthetic isoparaffin hydrocarbon “IP-Solvent 2835 (trade name)” of Idemitsu Petrochemical Co., Ltd., and Sanko Chemical Industries, Ltd. n-paraffin process Oil "Neothiozole (trade name)" etc. can be mentioned. Among these, paraffinic mineral oils are preferable, and paraffinic mineral oils having a small number of aromatic carbons are more preferable, from the viewpoint of compatibility. From the viewpoint of handleability, those which are liquid at room temperature are preferred. One or more of these can be used as the component (C).

  The component (C) may preferably have a dynamic viscosity at 37.8 ° C. of 20 to 1000 cSt, which is measured in accordance with JIS K 2283: 2000, from the viewpoint of heat resistance and handleability. Moreover, from the viewpoint of handleability, the pour point measured in accordance with JIS K 2269: 1987 may preferably be −25 to −10 ° C. Furthermore, from the viewpoint of safety, the flash point (COC) measured in accordance with JIS K 2265: 2007 may preferably be 170 to 300 ° C.

  The compounding amount of the component (C) is usually 60 to 150 parts by mass, preferably 70 to 140 parts by mass, more preferably 80 to 130 parts by mass with respect to 100 parts by mass of the component (B). The compounding amount of the component (C) is usually 60 parts by mass or more, preferably 70 parts by mass or more, more preferably 80 parts by mass or more from the viewpoint of flexibility with respect to 100 parts by mass of the component (B) . On the other hand, the amount is usually 150 parts by mass or less, preferably 140 parts by mass or less, and more preferably 130 parts by mass or less, from the viewpoint of suppressing the occurrence of bleed out.

(D) Organic peroxide:
The component (D) is an organic peroxide. The component (D) generates radicals during melt-kneading, and the radicals react in a chain reaction to crosslink the component (B) to realize good (very small) compression set and at the same time It also works to improve the oil resistance of moldings. Therefore, in order to improve compression set and oil resistance, it is necessary to increase the blending amount of the organic peroxide. However, when the compounding amount of the organic peroxide is increased, crosslinks are generated on the surface of the molded product and the moldability is deteriorated. Therefore, in the prior art, in order to obtain a molded product having a smooth surface, organic peroxide is used. It is necessary to suppress the compounding amount of the substance, and it is difficult to obtain a molded article which is excellent in compression set and oil resistance. In the present invention, as described later, the above components (A) and (B), (E) a cross-linking aid, (F) a silane coupling agent, and optionally each component of (G) an inorganic filler are mixed. The organic peroxide which is the component (D) is blended in a state where these respective components are sufficiently melt-kneaded. Therefore, it is possible to prevent the cross-linking reaction between the component (B) and the (D) organic peroxide before the respective components are sufficiently melt-kneaded, and as a result, the compression set is very high like the vulcanized rubber. It is possible to obtain a molded product which is small, has high oil resistance, and good appearance.

  Examples of the component (D) include dicumyl peroxide, di-t-butyl peroxide, 2,5-dimethyl-2,5-di- (t-butylperoxy) hexane, 2,5-dimethyl- 2,5-Di (t-butylperoxy) hexyne-3, 1,3-bis (t-butylperoxyisopropyl) benzene, 1,1-bis (t-butylperoxy) -3,3,5- Trimethylcyclohexane, n-butyl-4,4-bis (t-butylperoxy) valerate, benzoyl peroxide, p-chlorobenzoyl peroxide, 2,4-dichlorobenzoyl peroxide, t-butylperoxybenzoate, t- Butylperoxyisopropyl carbonate, diacetyl peroxide, lauroyl peroxide, and t-butylcumyl Such as it is possible to increase the over oxide. One or more of these can be used as the component (D).

  Among the above components (D), among them, 2,5-dimethyl-2,5-di- (t-butylperoxy) hexane from the viewpoint of the odor, coloring and scorch safety of the composition. And dicumyl peroxide are preferred.

  As a commercial item of the above-mentioned ingredient (D), NOF Corporation's "Perhexa 25B (brand name)", "Park mill D (brand name)", etc. can be mentioned, for example.

  The compounding amount of the component (D) is usually 0.1 parts by mass with respect to 100 parts by mass of the total of the components (A) and (B) (in other words, the composition consisting of the components (A) and (B)). It is 5 to 3 parts by mass, preferably 0.6 to 2.5 parts by mass, and more preferably 0.7 to 2 parts by mass. The compounding amount of the component (D) is usually 0.degree. From the viewpoint of sufficiently crosslinking the component (A) and (B) in total to make the compression set smaller and to improve the oil resistance. It is 5 parts by mass or more, preferably 0.6 parts by mass or more, and more preferably 0.7 parts by mass or more. On the other hand, the amount is usually 3 parts by mass or less, preferably 2.5 parts by mass or less, and more preferably 2 parts by mass or less, from the viewpoint of suppressing the generation of bumps (crosslinked gel).

(E) Crosslinking auxiliary:
The said component (E) is a crosslinking adjuvant. The component (E) functions to make the crosslinking reaction by the component (D) uniform and efficient.

  The component (E) is a monomer having two or more polymerizable functional groups in one molecule, and typically, for example, a polyfunctional vinyl monomer such as divinylbenzene and triallyl cyanurate; (Meth) acrylates, diethylene glycol di (meth) acrylates, triethylene glycol di (meth) acrylates, polyethylene glycol di (meth) acrylates, trimethylolpropane tri (meth) acrylates, and polyfunctional (meth) acrylates such as allyl (meth) acrylates And the like) and the like. In the present specification, (meth) acrylate means methacrylate or acrylate. As said component (E), 1 or more types of these can be used.

  The compounding amount of the component (E) is usually 0.1 to 6 parts by mass, preferably 0.3 to 5 parts by mass, more preferably 100 parts by mass in total of the components (A) and (B). It may be 0.5 to 4 parts by mass. The compounding amount of the component (E) is usually 0.1 parts by mass or more, preferably 0.3 parts by mass or more, more preferably 0.5 parts by mass or more from the viewpoint of obtaining the use effect of the component (E). May be there. On the other hand, it may be 6 parts by mass or less, preferably 5 parts by mass or less, more preferably 4 parts by mass or less, from the viewpoint of controlling the degree of crosslinking to an appropriate range.

(F) Silane coupling agent:
Component (F) is a silane coupling agent. Silane coupling agents include hydrolyzable groups (for example, alkoxy groups such as methoxy and ethoxy; acyloxy groups such as acetoxy; halogen such as chloro and the like), and organic functional groups (for example, amino and vinyl) And silane compounds having at least two different reactive groups such as an epoxy group, a methacryloxy group, an acryloxy group, and an isocyanate group. The component (F) functions to crosslink the component (B) to realize good compression set. The component (F) is also grafted to the component (B) and functions to form a crosslinking point in post treatment with warm water, so-called water crosslinking treatment.

  Examples of the component (F) include vinyl-based silane coupling agents (silane compounds having a vinyl group and a hydrolyzable group), methacrylic silane coupling agents (silane compounds having a methacryloxy group and a hydrolyzable group), Acrylic based silane coupling agent (silane compound having an acryloxy group and hydrolysable group), epoxy based silane coupling agent (silane compound having an epoxy group and hydrolysable group), amino based silane coupling agent (amino group and Examples thereof include silane compounds having a hydrolyzable group), and mercapto-based silane coupling agents (silane compounds having a mercapto group and a hydrolyzable group). As said component (F), 1 or more types of these can be used. Among these, a vinyl-type silane coupling agent is preferable as said component (F) from a heat-resistant deformation | transformation resistant viewpoint.

  Examples of the vinyl-based silane coupling agent include vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (β-methoxyethoxy) silane, vinyltriacetoxysilane, vinyl-tris (n-butoxy) silane, vinyl-tris (n) -Pentoxy) silane, vinyl-tris (n-hexoxy) silane, vinyl-tris (n-heptoxy) silane, vinyl-tris (n-octoxy) silane, vinyl-tris (n-dodecyloxo) silane, vinyl-bis (vinyl) mentioning n-butoxy) methylsilane, vinyl-bis (n-pentoxy) methylsilane, vinyl-bis (n-hexoxy) methylsilane, vinyl- (n-butoxy) dimethylsilane, vinyl- (n-pentoxy) dimethylsilane and the like Can.

  The compounding amount of the component (F) is usually 1 to 7 parts by mass, preferably 1.5 to 6.5 parts by mass, more preferably 100 parts by mass in total of the components (A) and (B). 2 to 6 parts by mass. The compounding amount of the component (F) is usually 1 part by mass or more, preferably 1 part by mass from the viewpoint of sufficiently crosslinking to reduce the compression set with respect to 100 parts by mass in total of the components (A) and (B). 0.5 parts by mass or more, more preferably 2 parts by mass or more. On the other hand, it may be 7 parts by mass or less, preferably 6.5 parts by mass or less, more preferably 6 parts by mass or less from the viewpoint of the balance (efficiency) of the compounding amount and the effect thereof.

(G) Inorganic filler:
The said component (G) is an inorganic filler. The component (G) is an optional component. The component (A) and the component (B) are generally commercially available in pellet form. The component (C), the component (D), the component (E), and the component (F) are often liquid at normal temperature. Therefore, when producing the elastomer composition of the present invention, the liquid component is introduced into a melt-kneading apparatus using a liquid addition apparatus in order to suppress or prevent separation and non-uniformity of the pellet component and the liquid component. By using the above-mentioned component (G), it becomes possible to introduce a part or all of the liquid component into the melt-kneading apparatus together with the pellet-like component without using the liquid addition apparatus.

  It does not specifically limit as said component (G), Arbitrary inorganic fillers can be used. Examples of the component (G) include calcium carbonate, magnesium carbonate, magnesium oxide, magnesium hydroxide, barium sulfate, talc, mica and clay. Among these, calcium carbonate, talc, and magnesium hydroxide are preferable from the viewpoint of the effect of suppressing and preventing separation and nonuniformity of the pellet-like component and the liquid component. One or more of these can be used as the component (G).

  The compounding amount of the component (G) is not particularly limited because it is an optional component, but it is generally 0 to 50 parts by mass, preferably 1 to 40 parts by weight based on 100 parts by mass of the components (A) and (B). It may be part by mass, more preferably 2 to 30 parts by mass. The compounding amount of the component (G) may be preferably 1 part by mass or more, more preferably 2 parts by mass or more, from the viewpoint of obtaining the use effect of the component (G). On the other hand, from the viewpoint of compression set and mechanical strength, it may be 50 parts by mass or less, preferably 40 parts by mass or less, and more preferably 30 parts by mass or less.

(H) Silanol condensation catalyst:
The component (H) is a silanol condensation catalyst. The component (H) is cross-linked at a crosslinking point (dehydration condensation reaction between silanols) formed by grafting the component (F) onto the component (B) during post-treatment with warm water, so-called water crosslinking treatment It functions to promote / catalyze, to improve (make smaller) compression set and to improve oil resistance.

  The component (H) is not particularly limited, and any silanol condensation catalyst can be used. Examples of the component (H) include dibutyltin dilaurate, dibutyltin diacetate, dibutyltin dioleate, stannous acetate, lead naphthenate, cobalt naphthenate, zinc caprylate, iron 2-ethylhexanoate, titanate ester, Examples thereof include tetrabutyltitanate, tetranonyltitanate, bis (acetylacetonitrile) diisopropyltitanium ethylamine complex, hexylamine complex, dibutylamine complex, and pyridine complex. One or more of these can be used as the component (H).

  The compounding amount of the above component (H) is not particularly limited because it is an optional component, but it is usually 0.005 to 0.3 parts by mass, preferably 0.008 to 80 parts by mass with respect to 100 parts by mass of the elastomer composition of the present invention. It may be 0.2 parts by mass. The compounding amount of the component (H) may be usually 0.005 parts by mass or more, preferably 0.008 parts by mass or more, from the viewpoint of obtaining the use effect of the component (H). On the other hand, it may be usually 0.3 parts by mass or less, preferably 0.2 parts by mass or less, from the viewpoint of the balance (efficiency) of the compounding amount and its effect.

  In the elastomer composition of the present invention, thermoplastic resins other than the above component (A) and the above component strip (B), softeners other than the above component (C) or, if desired, as long as the object of the present invention is not violated Inclusion of further additives such as plasticizers, pigments, organic fillers, lubricants, antioxidants, heat stabilizers, weather resistant stabilizers, mold release agents, antistatic agents, metal deactivators and surfactants. it can.

Method of producing an elastomeric composition:
The elastomer composition of the present invention comprises all of the components (A), (B), (E), (F) and (G), 0 to the total amount of the component (C), and optional components optionally used. Melt-kneading using an optional melt-kneader, the whole of the component (D) is added to the composition in which the above-mentioned components are sufficiently mixed, and heat treatment is performed dynamically, and subsequently It can be obtained by blending the remainder of component (C) into a dynamically heat-treated mixture. In addition, when the component (D) is added to the composition to which the whole amount of the component (C) is added, it goes without saying that it is not necessary to blend the remaining amount of the component (C) into the dynamically heat-treated mixture. Yes. In the present invention, since the component (D) which is an organic peroxide is compounded as described above, the first propylene resin which is the component (A) and the ethylene / α-olefin type which is the component (B) It is possible to prevent the cross-linking reaction between the component (B) and the (D) organic peroxide before sufficiently melt-kneading the copolymer and, as a result, the compression set is very high like the vulcanized rubber. It is possible to obtain a molded product which is small, has high oil resistance, and good appearance. In the present invention, in order to perform melt-kneading and heat treatment dynamically, for example, a single-screw extruder, a twin-screw extruder, a roll, a mixer, various kneaders, an apparatus combining these, etc. can be used appropriately. . Moreover, "dynamically heat treatment" means melt-kneading under temperature conditions where decomposition of the component (D) organic peroxide significantly occurs.

  The total temperature of the components (A), (B), (E), (F), (G), 0 to the total amount of the component (C), and optional components used if desired is melt-kneaded Although it can adjust suitably according to the kind of component, and the compounding quantity of each component, it is preferable that it is 170-290 degreeC in general, and it is preferable that it is 190-250 degreeC. By setting the melting temperature within the above range, it is possible to obtain a uniform molten mixture free of unmelted substances while suppressing the denaturation or decomposition of each component by heat.

  In addition, the temperature at the time of blending the organic peroxide which is the component (D), that is, the temperature at which the heat treatment is performed dynamically is usually a temperature higher than the one-minute half-life temperature of the component (D), preferably the above The temperature may be 5 ° C. higher than the 1-minute half-life temperature of the component (D). The time condition of the melt-kneading may be usually 20 seconds or more, preferably 30 seconds or more.

  In addition, when the components (A), (B), (E), (F), (G) and (C) are mixed and melt-kneaded, the compounding amount of the component (C) B) It may be 60 to 150 parts by mass with respect to 100 parts by mass, and is not particularly limited. For example, when initially melt-kneading each component, the entire amount of component (C) may be blended, or component (C) is not blended at the time of first melt-kneading, and component (D) is blended to dynamically After heat treatment, the entire amount of component (C) may be blended.

  The blending of the component (D) can be carried out by feeding the component (D) at any intermediate position of the discharge zone from the input zone of the melt-kneading apparatus as described above, by any means, but the component (A) The feed position may be arbitrary as long as the components (B), (E), (F) and (G) are sufficiently melt-kneaded. Moreover, when mix | blending a component (C) after mix | blending a component (D), it is necessary to mix | blend a component (C) in the position of discharge side rather than the position which mix | blends a component (D).

  The elastomer composition obtained as described above contains the organic peroxide of component (D) in a proportion of 0.5 to 3 parts by mass with respect to 100 parts by mass of the composition consisting of (A) and (B) The appearance is good though it is For example, the surface of the elastomer composition (molded product) obtained using an extrusion molding machine has an arithmetic average roughness Ra of 0.5 to 4 μm measured in accordance with JIS B 0601: 1994. On the other hand, when component (D) is also blended when melt-kneading components (A), (B), (E), (F), (G), and (C), the arithmetic of the resulting elastomer composition is obtained. Average roughness Ra will be 7 micrometers or more. As described above, in the present invention, it is possible to obtain a molded article having a good appearance while improving the compression set and oil resistance by using a large amount of the organic peroxide.

Water-Crosslinkable Elastomer Composition The water-crosslinkable elastomer composition of the present invention can be obtained by blending the silanol condensation catalyst which is the component (H) with the elastomer composition of the present invention. The component (H) may be blended with the silanol condensation catalyst as it is as it is, or may be blended as a composition melt-kneaded with any resin, so-called master batch. It is preferable to mix | blend said component (H) as a masterbatch from a viewpoint of handleability. The optional resin used for the masterbatch is not particularly limited, but ethylene / α-olefin copolymer, propylene-based resin and the like are preferable from the viewpoint of miscibility with the elastomer composition of the present invention. In the above masterbatch, if necessary, a softener, a plasticizer, a pigment, an organic filler, a lubricant, an antioxidant, a heat stabilizer, a weather resistant stabilizer, a mold release agent, and a charging agent, as long as the object of the present invention is not violated. Additives such as inhibitors, metal deactivators, and surfactants can also be included.

  The molded product of the present invention is obtained by using the water-crosslinkable elastomer composition of the present invention and molding into an arbitrary shape using an arbitrary molding machine and then performing post-treatment with warm water, so-called water crosslinking treatment be able to. The temperature conditions of the water crosslinking treatment may be usually normal temperature (20 ° C.) to 150 ° C., preferably 50 to 90 ° C. The time condition of the water crosslinking treatment may be usually 10 seconds to 1 week, preferably 1 minute to 3 days. It can also be contacted with water under pressure. Furthermore, water may contain a wetting agent or surfactant, a water-soluble organic solvent and other additives in order to improve the wettability of the molded product. Water is not limited to liquid water, and may be in the form of gas (water vapor or water in air). As said molding machine, an extruder, an injection molding machine, a blow molding machine etc. can be mentioned, for example.

  Hereinafter, the present invention will be described by way of examples, but the present invention is not limited thereto.

Raw materials used

(A) First propylene-based resin:
(A-1) Polypropylene homopolymer "Novatec EA 9 (trade name)" manufactured by Japan Polypropylene Corporation, melt mass flow rate (temperature 230 ° C, load 21.18 N) 0.5 g / 10 min.
(A-2) Polypropylene homopolymer "VS200A (trade name)" of Sun Aroma Co., Ltd. melt mass flow rate (temperature 230 ° C, load 21.18 N) 0.5 g / 10 min.
(A-3) Polypropylene homopolymer "PM900A (trade name)" of Sun Aroma Co., Ltd. melt mass flow rate (temperature 230 ° C., load 21.18 N) 30 g / 10 min.

(B) Ethylene / α-olefin copolymer:
(B-1) Content of 70% by mass of ethylene / α-olefin / diene copolymer “KEP 570P (trade name)” manufactured by KUMHO, a constituent unit derived from ethylene. Mooney viscosity ML _{1 + 4} (125 ° C.) 53, ENB content 4.5% by mass.

(C) Softener for non-aromatic rubber:
(C-1) Paraffin mineral oil "Diana Process Oil PW100 (trade name)" manufactured by Idemitsu Kosan Co., Ltd., dynamic viscosity 100 cSt (40 ° C), pour point -12 ° C, flash point 260 ° C.

(D) Organic peroxide:
(D-1) 2, 5-Dimethyl-2, 5-di- (t-butylperoxy) hexane "Perhexa 25B (trade name)" manufactured by NOF Corporation. One-minute half-life temperature 179.8 ° C.
(D-2) 2, 5-dimethyl-2, 5-di- (t- butylperoxy) hexane mixture of NOF Corporation "Perhexa 25 B-36 (trade name)". The mixture which diluted 36 mass% of said (D-1) with 64 mass% of said (C-1).

(E) Crosslinking auxiliary:
(E-1) Divinylbenzene "DVB-570 (trade name)" of Nippon Steel & Sumikin Chemical Co., Ltd.

(F) Silane coupling agent:
(F-1) Vinyltrimethoxysilane "KBM-1003 (trade name)" of Shin-Etsu Chemical Co., Ltd.

(G) Inorganic filler:
(G-1) Calcium carbonate "NS400 (trade name)" of Nitto Powdering Industry Co., Ltd.

(H) Silanol condensation catalyst:
(H-1) Dioctyltin dilaurate "Neostan U-810 (trade name)" manufactured by Nitto Kasei Kogyo Co., Ltd.

(I) Second propylene-based resin (I-1) polypropylene homopolymer "Novatec EA 9 (trade name)" manufactured by Japan Polypropylene Corporation, melt mass flow rate (temperature 230 ° C, load 21.18 N) 0.5 g / 10 min .

(J) Optional ingredients:
(J-1) A hindered phenol-based antioxidant "IRGANOX 1010 (trade name)" manufactured by BASF.
(J-2) Phosphorus-based antioxidant "IRGAFOS 168 (trade name)" manufactured by BASF.
(J-3) Carbon black master batch "PEM-8080 (trade name)" manufactured by Sumika Color Co., Ltd.

Example 1A
(1) Production of Elastomer Composition:
With respect to 100 parts by mass of a composition comprising 21.43 parts by mass of the above component (A-1), 9.52 parts by mass of the above component (A-3) and 69.05 parts by mass of the above component (B-1) 69.05 parts by mass of component (C-1), 2.79 parts by mass of component (D-2), 2.00 parts by mass of component (E-1), 3.00 parts by mass of component (F-1) Component (G-1): 28.57 parts by mass, Component (I-1): 69.05 parts by mass, Component (J-1): 0.24 parts by mass, Component (J-2): 0.12 The elastomer composition was manufactured using a mass part and 4.92 mass parts of the said components (J-3). After dry blending using a blender, components other than the components (D-2), (C-1) and (I-1) are co-rotated using a co-rotating twin-screw extruder, and then screw roots of the extruder Component (D-2) is fed using the liquid addition device at about 1/4 of the total length of the extruder barrel, and then the above component (C-1) is added to the liquid addition device. Use and feed at about 1/2 of the total length of the extruder barrel, and then feed the above component (I-1) at about 3/4 of the total length of the extruder barrel, and set the die temperature at 200 ° C. The composition was melt-kneaded under the following conditions to obtain an elastomer composition.

(2) Production of silanol catalyst masterbatch:
100 parts by mass of a composition comprising 14% by mass of the component (A-2), 5% by mass of the component (A-3), 44% by mass of the component (B-1), 37% by mass of the component (C-1) Relative to the above components (D-1) 0.15 parts by mass, the above components (E-1) 0.3 parts by mass, the above components (H-1) 0.5 parts by mass, the above components (J-1) A silanol catalyst masterbatch using 0.1 parts by mass, 0.05 parts by mass of the component (J-2), 16 parts by mass of the component (G-1), and 2.022 parts by mass of the component (J-3) It was created. The components other than the component (C-1) are dry-blended using a blender using a co-rotating twin-screw extruder, and then fed to the position of the screw root of the extruder, the component (C-1) 2.) using a liquid addition apparatus, side-feed at about 1/2 of the total length of the extruder barrel, and melt kneading at a die temperature of 200 ° C. to obtain a silanol catalyst master batch.

(3) Production of water-crosslinkable elastomer composition:
Using a blender, 100 parts by mass of the elastomer composition obtained in the above step (1) and 5 parts by mass of the silanol catalyst masterbatch obtained in the above step (2) (0.01999 parts by mass converted to the above component (H-1)) The mixture was dry blended to obtain a water-crosslinkable elastomer composition.

(4) Production of moldings:
Using the water-crosslinkable elastomer composition obtained in the above step (3), a flat plate having a thickness of 2 mm, a length of 130 mm and a width of 130 mm was prepared using an injection molding machine under the condition of an injection resin temperature of 200 ° C.
(4-1) Molded product for collecting test pieces for tensile test or oil resistance test:
The flat plate obtained above was immersed in warm water at a temperature of 80 ° C. for 48 hours to obtain a molded product for collecting a tensile test or oil resistance test specimen.
(4-2) Molded product for collection of test pieces for compression set or hardness:
Four flat plates obtained above are stacked and pressed at a temperature of 200 ° C to form a 6.3 mm thick, 160 mm long and 130 mm wide flat plate, which is then immersed in warm water at a temperature of 80 ° C. for 48 hours. Then, a molded product for obtaining a specimen for compression set or hardness was obtained.
(4-3) Molded materials for collecting test pieces for appearance evaluation:
Attach a die with a slit of 1 mm thick × 25 mm wide to a 20 mm single screw extruder, extrude at a screw speed of 30 rpm, an extrusion temperature of 220 ° C, contact one side to a metal roll and air cool the opposite side. An extruded sheet with a thickness of 1 mm was produced to obtain a molded article for collecting a test piece for appearance evaluation.

The following tests (1) to (5) were performed. The results are shown in Table 1.
In addition, the compounding quantity of the said component (A) and (B) in a table | surface is a value with respect to 100 mass parts of compositions which consist of the said component (A) and (B).
Composition P in the table means a composition consisting of the components (A) and (B).
The compounding amounts of the components (C) to (G) and the components (I) to (J) in the table are relative to 100 parts by mass of the composition P (composition comprising the components (A) and (B)) It is a value.
The compounding amount of the component (C) in the table is also described along with the value for 100 parts by mass of the component (B) together with the value for 100 parts by mass of the composition consisting of the components (A) and (B).
When the said component (D-2) was used, the conversion amount as said component (D-1) was also written together. Moreover, the component (C-1) contained in a component (D-2) is not contained as a quantity of a component (C).
Composition Q in the table means an elastomeric composition. Composition R in the table means a water-crosslinkable elastomeric composition.
MB in the table means silanol catalyst masterbatch. The compounding amount of MB in the table is a value relative to 100 parts by mass of the elastomer composition. At this time, components other than the above component (H) in MB are calculated without being included in the elastomer composition.
The value of the said component (H) in a table | surface is a compounding quantity of the said component (H) with respect to 100 mass parts of elastomer compositions computed from the compounding quantity of MB. At this time, it is the column of "H-1" that is calculated without including the component other than the above-mentioned component (H) in MB in the elastomer composition, and it is calculated that it is included in the column of "H-1 conversion". is there.

(1) Compression set:
According to JIS K6262: 2013, using the molded product obtained in the above (4-2), compression set under the conditions of Method A, compression test of 25%, small test piece, temperature 70 ° C. or 120 ° C., 22 hours Was measured.

(2) Hardness:
The hardness (15 seconds value) of Shore A was measured using the molded product obtained in the above (4-2) in accordance with JIS K6253-3: 2012.

(3) Tensile test:
According to JIS K6251: 2010, it measured on the conditions of 500 mm / min of tensile velocity using the dumbbell-like No. 3 test piece pierced from the molded object obtained by said (4-1) according to.

(4) Oil resistance test:
Based on JIS K 6258: 2003, using the test pieces collected from the molded product obtained in the above (4-1), the volume swelling ratio after being immersed in IRM # 903 oil at a temperature of 120 ° C. for 22 hours was measured.

(5) Appearance evaluation Based on JISB0601: 1994, arithmetic mean roughness Ra of the surface (air-cooled surface) of the molded object obtained by said (4-3) was measured. Moreover, the surface state (air-cooled surface) was visually evaluated.

Example 1B
With respect to 100 parts by mass of a composition comprising 21.43 parts by mass of the above component (A-1), 9.52 parts by mass of the above component (A-3) and 69.05 parts by mass of the above component (B-1) 69.05 parts by mass of the component (C-1), 2.79 parts by mass of the component (D-2), 2.00 parts by mass of the component (E-1), 3.00 parts by mass of the component (F-1) Component (G-1): 28.57 parts by mass, Component (I-1): 69.05 parts by mass, Component (J-1): 0.24 parts by mass, Component (J-2): 0.12 The elastomer composition was manufactured using a mass part and 4.92 mass parts of the said components (J-3). Using a co-rotating twin-screw extruder, 61.90 parts by mass of the component (C-1) 69.05 parts by mass, components other than (D-2) and (I-1) are blender After dry blending using, feed to the position of screw root of extruder, the above-mentioned component (D-2) feeds using about a quarter of the total length of extruder barrel using a liquid addition device, and then 61.90 parts by mass of the component (C-1) is fed using a liquid addition apparatus at a position of about 1/2 of the total length of the extruder barrel, and thereafter, the component (I-1) is extruded in the extruder barrel The elastomer composition was obtained by side-feed at about 3⁄4 of the total length and melt-kneading under the conditions of a die setting temperature of 200 ° C. Other than that, it carried out like Example 1A. The results are shown in Table 1.

Examples 2-8
Example 1A was repeated except that the components of the elastomeric composition were changed as shown in any one of Tables 1-2. The results are shown in any one of Tables 1-2.

Example 9
The components of the elastomer composition were changed as shown in Table 2, and the procedure was carried out in the same manner as Example 1A except that the component (I) was not added as a side feed. The results are shown in Table 2.

Examples 10-14
(1 ′) 100 parts by weight of a composition comprising 21.43 parts by weight of the component (A-1), 9.52 parts by weight of the component (A-3), 69.05 parts by weight of the component (B-1) In contrast, 69.5 parts by mass of the component (C-1), 2.79 parts by mass of the component (D-2), 2.0 parts by mass of the component (E-1), and the component (F-1) 3 .0 parts by mass, 28.57 parts by mass of the component (G-1), 69.05 parts by mass of the component (I-1), 0.24 parts by mass of the component (J-1), the component (J-2) The elastomer composition was manufactured using 0.12 mass part and 4.92 mass parts of said components (J-3). The components other than the component (C-1), the component (D-2), and the component (I-1) are dry-blended using a blender using a co-rotating twin-screw extruder, The component (D-1) is fed to the position of the screw root of the extruder, and the component (D-1) is fed at a position of about 1/4 of the total length of the extruder barrel using a liquid addition device, and then the component (C-1) Uses a liquid addition apparatus and feeds it at about 1/2 of the total length of the extruder barrel, and then side feeds the above component (I-1) at about 3/4 of the total length of the extruder barrel, It melt-kneaded on the conditions of dice | dies preset temperature 200 degreeC, and obtained the elastomer composition.
(2 ′) Using the elastomer composition obtained in the above (1 ′), a flat plate having a thickness of 2 mm, a length of 130 mm and a width of 130 mm was produced under the condition of an injection resin temperature of 200 ° C. using an injection molding machine.
(3 ')
(3'-1) Molded product for tensile test or oil resistance test specimen collection:
The flat plate obtained in the above (2 ′) was immersed in warm water at a temperature of 80 ° C. for 48 hours to obtain a molded product for collecting a test specimen for tensile test or oil resistance test.
(3'-2) Molded product for collection of specimen for compression set or hardness:
Four flat plates obtained in the above (2 ') are stacked and press-formed at a temperature of 200 ° C. to form a 6.3 mm thick, 160 mm long and 130 mm wide flat plate, which is further heated in hot water at a temperature of 80 ° C. The sample was immersed for 48 hours to obtain a molded product for collecting a compression set or a specimen for hardness.
(3'-3) Molded material for collecting test pieces for appearance evaluation:
Attach a die with a slit of 1 mm thick × 25 mm wide to a 20 mm single screw extruder, extrude at a screw speed of 30 rpm, an extrusion temperature of 220 ° C, contact one side to a metal roll and air cool the opposite side. An extruded sheet with a thickness of 1 mm was produced to obtain a molded article for collecting a test piece for appearance evaluation.

  Tests similar to the above tests (1) to (5) were performed. The results are shown in any one of Tables 2-3.

Examples 15-21
The components of the elastomer composition were changed as shown in any one of Tables 3 to 4, and the same procedures as in Examples 10 to 14 were conducted except that the immersion treatment in warm water was not performed. The results are shown in any one of Tables 3 to 4.

Example 22 (comparative example)
The components of the elastomer composition are changed as shown in Table 4, and the same as Example 1A except that the component (D-1) is mainly fed at once in place of side feeding the component (D-2). went. The results are shown in Table 4.

Example 23 (comparative example)
A molded product was manufactured using an olefin-based thermoplastic elastomer composition “Santoplane 101-73 (trade name)” manufactured by Exxon Mobil Co., Ltd. as an elastomer composition, and various tests were conducted. The results are shown in Table 4.

Example 24 (comparative example)
Example 22 was carried out in the same manner as Example 22, except that an olefin-based thermoplastic elastomer composition “Santoplane 101-87 (trade name)” manufactured by Exxon Mobil was used as an elastomer composition. The results are shown in Table 4.

Example 25 (comparative example)
Example 2 was carried out in the same manner as Example 2 except that the amounts of the components (D-2) and (E-1) in Example 2 were changed as shown in Table 4. The results are shown in Table 4.

  The elastomer composition of the present invention can be shaped and processed like a thermoplastic resin using conventional plastic processing equipment, and its compression set is very small like vulcanized rubber, and its oil resistance is high. And, a molded article having a good appearance can be obtained. Therefore, as a material which substitutes a vulcanized rubber, it can be used suitably for packing for cars, packing for building materials, etc.

Claims (8)

(A) 10 to 80 parts by mass of the first propylene resin;
(B) 20 to 90 parts by mass of ethylene / α-olefin copolymer;
(C) Softener for non-aromatic rubber: 60 to 150 parts by mass with respect to 100 parts by mass of (B);
(D) Organic peroxide 0.5 to 3 parts by mass with respect to 100 parts by mass of the composition consisting of (A) and (B);
(E) Crosslinking auxiliary agent 0.1 to 6 parts by mass with respect to 100 parts by mass of the composition comprising (A) and (B);
(F) Silane coupling agent 1 to 7 parts by mass with respect to 100 parts by mass of the composition consisting of (A) and (B); and (G) Inorganic filler Composition 100 consisting of (A) and (B) 0 to 50 parts by mass with respect to parts by mass;
An elastomeric composition comprising: (1) The (A) first propylene-based resin, the (B) ethylene / α-olefin polymer, the (E) crosslinking aid, the (F) silane coupling agent, and the (G) inorganic Melt-kneading the whole amount of the filler and 0 to the whole amount of the non-aromatic rubber softener (C),
(2) The entire amount of the (D) organic peroxide is added to the composition obtained in the step (1), and heat treatment is performed dynamically,
(3) The elastomer composition according to claim 1, obtained by blending the residue of (C) added in the step (1) with the composition obtained in the step (2).   The elastomer composition according to claim 2, wherein in the step (3), the residue of (C) added in the step (1) and (I) a second propylene-based resin are blended.   The elastomer composition as described in any one of Claims 1-3 whose arithmetic mean roughness Ra of the surface is 0.5-4.0 micrometers.   Furthermore, the water-crosslinkable elastomer composition which contains 0.005-0.3 mass part of (H) silanol condensation catalysts with respect to 100 mass parts of elastomer compositions as described in any one of Claims 1-4.   A molded article comprising the elastomer composition according to any one of claims 1 to 4 or the water-crosslinkable elastomer composition according to claim 5. (1) (A) 10 to 80 parts by mass of the first propylene resin;
(B) 20-90 parts by mass of ethylene / α-olefin polymer;
(E) Crosslinking auxiliary agent 0.1 to 6 parts by mass with respect to 100 parts by mass of the composition comprising (A) and (B);
(F) Silane coupling agent 1 to 7 parts by mass with respect to 100 parts by mass of the composition consisting of (A) and (B); and (G) Inorganic filler Composition 100 consisting of (A) and (B) The total amount of 0 to 50 parts by mass with respect to the mass parts,
(C) Softener for aromatic rubber 0 to whole amount of 60 to 150 parts by mass with respect to 100 parts by mass of (B)
A process of melting and kneading;
(2) In the composition obtained in the step (1), 0.2 to 3 parts by mass with respect to 100 parts by mass of the composition comprising the (D) organic peroxide and the (A) and (B). Adding and heat treating dynamically;
(3) adding the residue of (C) added in the step (1) to the composition obtained in the step (2);
(4) A step of blending 0.005 to 0.3 parts by mass of the (H) silanol condensation catalyst with respect to 100 parts by mass of the elastomer composition obtained in the step (3);
(5) a step of forming the elastomer composition blended with the (H) silanol condensation catalyst in the step (4) into a molded article; and (6) a molded article formed in the step (5) with warm water Processing steps;
A method of producing a molded article comprising:   The manufacturing method of the molded object of Claim 7 which mix | blends the residue of (C) added at the said process (1), and the (I) 2nd propylene-type resin in the said process (3).