Nippon Zeon Company, Ltd.

Tokai Rubber Industries, Ltd.

Tetsuo Ohyama

Hiroyuki Watanabe

Shuichi Akita

Akio Ueda

Haruki Kawada

Mitsuyoshi Aonuma

Toshio Kase

Akihiro Shibahara

Kohkichi Noguchi

Yasunori Iwasaki

Takao Sugiura

A rubber composition containing (A) a mixture obtained by mixing (a1) 100 parts by weight of a highly saturated, ethylenically unsaturated nitrile-conjugated diene copolymer rubber whose copolymer chain contains not more than 30% by weight of conjugated diene units, and (a2) from 10 to 100 parts by weight of an ethylenically unsaturated monomer containing at least one carboxyl group, at least a proportion of the at least one carboxyl group being metal substituted such that a molar ratio of the at least one carboxyl group to the metal falls within a range of from 1/0.5 to 1/3; (B) an organic peroxide; and (C) a fatty acid amide, from 0.2 to 15 parts by weight of the (B) organic peroxide and from 0.5 to 20 parts by weight of the (C) fatty acid amide being added to 100 parts by weight of the (A) mixture.

Rubber composition containing a nitrile-conjugated diene copolymer

A vibration insulating rubber having an improved balance between its loss tangent and dynamic-to-static modulus ratio is prepared by molding and curing a rubber compound comprising as a rubber component a modified rubbery polymer obtained by reacting (1) a rubbery polymer having at least one metal selected from alkali metals and alkaline earth metals bonded to its molecular chain with (2) at least one compound selected from organic compounds having a bond of the formula ##STR1## wherein X represents an oxygen or sulfur atom, in the molecule, benzophenones having at least one of unsubstituted and substituted amino groups, and thiobenzophenones having at least one of unsubstituted or substituted amino groups.

Vibration insulating rubber

A process for modifying a polymer of a conjugated diene, which comprises reacting a polymer of a conjugated diene containing at least one metal selected from alkali metals and alkaline earth metals with a compound having a linkage of the following formula ##STR1## wherein X represents an oxygen or sulfur atom, in the molecule.

Process for modifying conjugated diene polymers

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Yokohama, Japan

Tetsuo Ohyama