Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
2007-06-19
2007-06-19
Seidleck, James J. (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S072000, C525S191000
Reexamination Certificate
active
10829228
ABSTRACT:
A rubber composition includes α,β-ethylenically unsaturated nitrile-conjugated diene copolymer rubber (A), α,β-ethylenically unsaturated nitrile-conjugated diene copolymer rubber (B), ethylene-α-olefin copolymer rubber (C), and a graft copolymer (D). The graft copolymer (D) is obtained by performing graft copolymerization on a mixture of an aromatic vinyl compound and an α,β-ethylenically unsaturated nitrite monomer with an ethylene-propylene-unconjugated copolymer. A content of structure units of the ethylene-propylene-unconjugated copolymer is 20 to 70 wt %, a ratio of the graft copolymer (D) with respect to 100 parts by weight in total of said rubber (A), rubber (B) and rubber (C) is 1 to 30 parts by weight. A composition ratio of the rubber (A), rubber (B) and rubber (C) is rubber (A): 20 to 79 wt %, rubber (B): 1 to 30 wt %, and rubber (C): 20 to 50 wt %.
REFERENCES:
patent: 4202948 (1980-05-01), Peascoe
patent: 4456727 (1984-06-01), Middlebrook
patent: 6498223 (2002-12-01), Sakata et al.
patent: 54-106554 (1979-08-01), None
patent: 2003-246889 (2003-09-01), None
Emori Nobuyoshi
Fujiwara Hideyuki
Ikeda Fumio
Iwata Takahiro
Mizushima Takashi
Haider Saira B.
Seidleck James J.
Toyoda Gosei Co,., Ltd.
Zeon Corporation
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