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Adhesives and Rubbers

Vibration-insulating-rubber-composition

Thermoplastic adhesive compositions

OF THE INVENTION It has now been discovered and forms a unique feature of this invention that ...

Terblends and films of LLDPE, LMW-HDPE and HMW-HDPE

OF THE INVENTION The blends of this invention which exhibit improved extrusion characteristics ...

Release agent composition

OF THE INVENTION The objectives of this invention are achieved by release agent composition ...

Coating compositions prepared from hydroxyl functional graft copolymers

OF THE INVENTION The ungelled, hydroxyl functional graft copolymer of the present invention is ...

Solid state thermosensitive polymer compositions

OF THE INVENTION Representative devices and apparatus useful in this invention are disclosed in U.S...

Contact adhesive and adhesive system for EPDM and related elastomers

OF THE INVENTION The term "EPDM" is used in the sense of its definition as found in ASTM-D-1418-64 ...

Making rubber blends of diene rubber & EPR or EPDM

I claim: 1. The process of producing a rubber blend by masticating a mixture of (A) monoolefin ...

Flame-retardant olefinic resin composition

OF THE INVENTION The present invention is explained specifically with reference to Examples and C...

Polymer alloy

OF THE INVENTION The highly unsaturated rubbery polymer which is utilized in the alloys of the ...

Foaming thermoplastic elastomers

A more complete description of the invention may be obtained by reference to the following ...

Vibration-insulating rubber composition

Details

Inventors: Nakauchi, Hideo; Kato, Shingo; Ando, Yukio;
Assignee: Bridgestone Tire Co., Ltd. (Tokyo, JP)
Primary Examiner: Bleutge; John C.
Assistant Examiner: Lilling; Herbert J.
Attorney, Agent or Firm: Cushman, Darby & Cushman

There is disclosed a rubber composition having excellent vibration-insulating properties. The rubber composition comprises 45 to 75 parts by weight of at least one rubber selected from the group consisting of natural rubber, isoprene rubber, butadiene rubber and styrene-butadiene rubber; 40 to 20 parts by weight of halogenated butyl rubber; 5 to 15 parts by weight of copolymer having a styrene content of not less than 50%; 20 to 80 parts by weight of carbon black based on 100 parts by weight of the total of the above rubbers and copolymer; and 3 to 25 parts by weight of aromatic process oil based on 100 parts by weight of the total of the above rubbers and copolymer.

DETAILED DESCRIPTION What is claimed is: 1.
A vibration-insulating rubber composition comprising: 45 to 75 parts by weight of at least one rubber selected from the group consisting of natural rubber, isoprene rubber, butadiene rubber and styrene-butadiene rubber having a styrene content of about 23%; 40 to 20 parts by weight of a halogenated butyl rubber; 5 to 15 parts by weight of a copolymer having a styrene content of not less than 50%; 20 to 80 parts by weight of carbon black, based on 100 parts by weight of the total of the above rubbers and copolymer; and 3 to 25 parts by weight of an aromatic process oil, based on 100 parts by weight of the total of the above rubbers and copolymer.
2.
A vibration-insulating rubber composition according to claim 1, in which said halogenated butyl rubber is brominated butyl rubber.
3.
A vibration-insulating rubber composition according to claim 1, in which said copolymer has the maximum damping coefficient at a temperature of between about 40.
degree.
C.
to about 80.
degree.
C.
4.
A vibration-insulating rubber composition according to claim 1, in which the styrene-containing copolymer is present in an amount of about 5 to about 9 parts by weight and the rubber is present in an amount of about 51 to about 75 parts by weight.
5.
A vibration-insulating rubber composition according to claim 1, in which said copolymer has a styrene content of about 55 to about 75%.
6.
An automobile engine mounting made of the vibration-insulating rubber composition of claim 1.
7.
A vibration-insulating rubber composition having the maximum damping coefficient and a low ratio of dynamic and static moduluses at a temperature of between about 40.
degree.
C.
to about 80.
degree.
C.
, said rubber composition consisting essentially of: 45 to 75 parts by weight of at least one rubber selected from the group consisting of natural rubber, isoprene rubber, butadiene rubber and styrene-butadiene rubber having a styrene content of about 23%; 40 to 20 parts by weight of a halogenated butyl rubber; 5 to 15 parts by weight of a copolymer having a styrene content of not less than 50%; 20 to 80 parts by weight of carbon black, based on 100 parts by weight of the total of the above rubbers and copolymer; and 3 to 25 parts by weight of an aromatic process oil, based on 100 parts by weight of the total of the above rubbers and copolymer

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