Sumitomo Chemical Company, Limited

Agency of Industrial Science and Technology

Akio Daimon

Hideo Shinonaga

Tatsuyuki Mitsuno

Satoru Hosoda

Teruhisa Koyama

Koichiro Ibuki

Koichiroh Katoh

Tatasuyuki Mitsuno

Hiroshi Katsuki

An olefinic resin composition which is moldable to shaped articles coatable with coating compositions without primers is prepared by blending (A) a cross-linked olefinic thermoplastic elastomer obtained from a homo- or co-polymer of alpha-olefin (C.sub.2-20) and elastomeric copolymer composed of alpha-olefins (C.sub.2-20), (B) a low-molecular weight modified polypropylene having Mn of 2,000-20,000 which is grafted with maleic anhydride and (C) a tackifier.

Olefin resin composition

A shaped body formed of a polypropylene resin is surface-treated by a method which includes the steps of:

Method of treating surface of shaped body formed of polypropylene resin

There is provided a thermoplastic elastomer composition having excellent surface processabilities such as adhesion, paintability and printability together with impact resistance. This composition comprises (A) 20-80% by weight of a polypropylene resin, (B) 5-38% by weight of an ethylene copolymer having 82-98.7 mol % of an ethylene unit, 1-15 mol % of an ester unit selected from alkyl acrylate and methacrylate having an alkyl group of 1-8 carbon atoms and 0.3-3 mol % of an unsaturated dicarboxylic acid anhydride unit and (C) 5-70% by weight of ethylene-propylene and/or ethylene-propylene-non-conjugated diene copolymer rubber which contain 50-85 mol % of an ethylene unit and have a Mooney viscosity at 100.degree. C. of 20-100 and an iodine value of 20 or less.

Thermoplastic elastomer composition

A thermoplastic elastomer composition which is excellent in melt-flowability and is able to afford injection molded articles superior in appearance is provided, which is a mixture comprising (A) 20-50 parts by weight of an olefinic copolymer rubber, (B) 50-80 parts by weight of an olefinic plastic having a ratio of melt index M.sub.1 /M.sub.0 of 2-50 wherein M.sub.0 is a melt index of the plastic before subjected to thermal decomposition with organic peroxide and M.sub.1 is a melt index of the plastic after subjected to the thermal decomposition with the organic peroxide, sum of (A) and (B) being 100 parts by weight, (C) 5-25 parts by weight of a mineral oil and (D) 0.1-3 parts by weight of a bismaleimide compound, said mixture being dynamically heat treated with (E) an organic peroxide after bismaleimide compound (D) is homogeneously dispersed in the mixture.

Thermoplastic elastomer composition and process for producing same

A process for producing a filler-containing polypropylene resin composition is disclosed. The composition comprises (a) from 27 to 87% by weight of a polypropylene resin, (b) from 3 to 15% by weight of a modified polypropylene resin containing from 0.1 to 3 mol% of an unsaturated dicarboxylic acid anhydride repeating unit, (c) from 5 to 30% by weight of an ethylene copolymer composed of from 82 to 98.7 mol% of an ethylene repeating unit, from 1 to 15 mol% of an ester repeating unit selected from alkyl acrylates and alkyl methacrylates having from 1 to 8 carbon atoms in the alkyl moiety thereof, and from 0.3 to 3 mol% of an unsaturated dicarboxylic acid anhydride repeating unit, and (d) from 5 to 40% by weight of a filler. The process comprises melt-mixing the components (a), (b), and (d) and then melt-mixing the resulting mixture with the component (c). The resin compositon exhibits excellent finishing properties, such as adhesion, coating properties, and printability, as well as improved rigidity and thermal properties.

Process for producing filler-containing polypropylene resin composition

A filler-containing polypropylene resin composition and a process for producing the same are disclosed. The composition comprises (a) from 27 to 87% by weight of a polypropylene resin, (b) from 3 to 15% by weight of a modified polypropylene resin containing from 0.1 to 3 mol % of an unsaturated dicarboxylic acid anhydride repeating unit, (c) from 5 to 30% by weight of an ethylene copolymer composed of from 82 to 98.7 mol % of an ethylene repeating unit, from 1 to 15 mol % of an ester repeating unit selected from alkyl acrylates and alkyl methacrylates having from 1 to 8 carbon atoms in the alkyl moiety thereof, and from 0.3 to 3 mol % of an unsaturated dicarboxylic acid anhydride repeating unit, and (d) from 5 to 40% by weight of a filler. The process comprises melt-mixing the components (a), (b) and (d) and then melt-mixing the resulting mixture with the component (c). The resin composition exhibits excellent finishing properties, such as adhesion, coating properties, and printability, as well as improved rigidity and thermal properties.

Filler-containing polypropylene resin composition and process for

A resin composition for soft bumpers is disclosed, comprising (a) 100 parts by weight of a selectively hydrogenated block copolymer having at least two mono-alkenyl or mono-alkenylidene aromatic hydrocarbon polymer blocks having a number average molecular weight of from 5,000 to 15,000 and at least one partially or completely hydrogenated aliphatic conjugated diene hydrocarbon polymer block having a number average molecular weight of from 10,000 to 75,000, (b) from 10 to 100 parts by weight of an ethylene-propylene copolymer rubber having a Mooney viscosity of from 15 to 50 as measured at 100.degree. C. and an intrinsic viscosity of from 1.2 to 2.0 dl/g as measured in a xylene solution at 70.degree. C., (c) from 200 to 400 parts by weight of a propylene-ethylene block copolymer having a melt flow rate of from 10 to 30 g/10 min and an ethylene content of from 5 to 15% by weight, and (d) from 20 to 200 parts by weight of a non-aromatic diluent oil for rubber. The composition provides soft bumpers having improved appearance, such as gloss and surface uniformity, improved scratch resistance and excellent coating properties.

Resin composition for soft bumpers

A filler-containing polypropylene resin composition is disclosed, comprising (a) from 30 to 90% by weight of a polypropylene resin, (b) from 2.5 to 38% by weight of an ethylene copolymer composed of from 82 to 98.7 mol % of ethylene, from 1 to 15 mol % of an ester selected from alkyl acrylate and alkyl methacrylates having from 1 to 8 carbon atoms in the alkyl moiety thereof and from 0.3 to 3 mol % of an unsaturated dicarboxylic acid anhydride, and (c) from 5 to 50% by weight of a filler. Molded products obtained from the composition have improved finishing properties, such as adhesion, coating properties, printability, and the like.

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Chiba, Japan

Akio Daimon