Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1991-10-18
1994-04-05
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525242, 525284, 525302, C08F26502, C08F26900
Patent
active
053005813
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a process for producing a thermoplastic elastomer. More specifically, it relates to a process for producing a thermoplastic elastomer, in which there can be efficiently obtained a thermoplastic elastomer which has excellent elasticity even if its rubber content is small and which also has high strength. Further, the present invention relates to a process for producing a thermoplastic elastomer which is not only excellent in heat resistance, tensile strength, weatherability, flexibility, elasticity and low-temperature impact resistance but also excellent in surface smoothness, coatability and thermal adhesion to different materials.
TECHNICAL BACKGROUND
A thermoplastic elastomer has been conventionally widely used as an automobile part such as a bumper, etc. This thermoplastic elastomer has both of thermoplastic properties and elastic properties, and can be molded, by injection molding, extrusion molding, etc, into an article which is excellent in heat resistance, tensile properties, weatherability, flexibility and elasticity.
Japanese Patent Publication No. 34210/1978 discloses a thermoplastic elastomer in which 60 to 80 parts by weight of a monoolefin copolymer rubber and 40 to 20 parts by weight of polyolefin plastic are dynamically and partially cured. Japanese Patent Publication No. 21021/1978 discloses a thermoplastic elastomer comprising (a) a partially crosslinked copolymer rubber composed of an ethylene-propylene-non-conjugated polyene copolymer rubber and having a gel content of 30 to 90% by weight and (b) a polyolefin resin. Further, Japanese Patent Publication No. 18448/1980 discloses a thermoplastic elastomer in which an ethylene-propylene copolymer rubber and a polyolefin resin are dynamically and either partially or completely crosslinked. Meanwhile, Japanese Laid-Open Patent Publication No. 187412/1983 discloses a crosslinked block copolymer which is derived from an olefinic block copolymer containing 50 to 70 parts by weight of a block (A) having a propylene content of 100 to 60% by weight and selected from a propylene homopolymer block and a binary propylene-ethylene or propylene-C.sub.4 -C.sub.12 .alpha.-olefin random copolymer block and 30 to 50 parts by weight of a binary ethylene-propylene random copolymer block (B) having an ethylene content of 30 to 85% by weight, and which has characteristic features in a specific content of a hot xylene-insoluble component and specific fluidity.
Further, Japanese Laid-Open Patent Publications Nos. 165414/1988, 165115/1988 and 161516/1988 and U.S. Pat. No. 4,454,306 disclose a process for producing a crosslinked olefinic block copolymer, which comprises kneading and crosslinking an olefin block copolymer containing a propylene homopolymer block (A) prepared in the presence of a specific Ziegler catalyst, a binary propylene ethylene random copolymer block (B) and a binary propylene ethylene random copolymer block (C) together with an organic peroxide, a divinyl compound and an antioxidant at a temperature of not more than 230.degree. C. Japanese Laid-Open Patent Publication No. 21731/1973 discloses a process for improving a block copolymer in processability, which comprises mixing an organic peroxide with a block copolymer containing 3 to 30% by weight of a copolymer portion which is composed mainly of ethylene and contains not more than 70% by weight of an other .alpha.-olefin and 97 to 70% by weight of a polymer portion composed mainly of propylene, and subjecting the resultant mixture to heat treatment at a temperature between 180.degree. C. and 270.degree. C.
Further, Japanese Laid-Open Patent Publication No. 90007/1982 discloses a process which comprises mixing 100 parts by weight of a block copolymer or a copolymer composition containing a polypropylene polymer portion and an ethylene propylene copolymer portion having an ethylene unit content of 20 to 80% by weight, in which the intrinsic viscosity of the polypropylene polymer portion is 1.4 to 3 dl/g, the content of this portion is not less
REFERENCES:
patent: 4001172 (1977-01-01), Steinkamp et al.
patent: 5095059 (1992-03-01), Kitamura et al.
Kioka Mamoru
Okamoto Katsuo
Otawa Yasuhiko
Ueda Takashi
Kight III John
Mitsui Petrochemical Industries Ltd.
Mosley T.
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