Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1986-07-11
1987-11-17
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524474, 525280, 525314, C08L 5300
Patent
active
047075147
ABSTRACT:
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.
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Daimon Akio
Katsuki Hiroshi
Sarofin N.
Schofer Joseph L.
Sumitomo Chemical Company Limited
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