Isoprene-butadiene copolymer rubber having improved processing p

Details Isoprene-butadiene copolymer rubber having improved processing p Isoprene-butadiene copolymer rubber having improved processing p

1981-09-16

1983-11-01

Levin, Stanford M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

5253327, 526173, 526177, 526183, 526337, C08F29704, C08F23608, C08F23610

Patent

active

044130988

ABSTRACT:
An isoprene-butadiene copolymer rubber having improved processing properties which comprises a microstructure of the butadiene portion having from 70% to 90% of trans-1,4 linkage and from 2% to 8% of vinyl linkage, an isoprene content of from 3 to 25 wt %, and a styrene content of from 0 to 30 wt %, said copolymer rubber having a Mooney Viscosity of from 30 to 150, and a molecular weight distribution, Mw/Mn of from 1.2 to 3.5, said rubber, in the unelongated state, not showing a melting point measured by the differential calorimeter analysis method. The copolymer rubber of the present invention can be used for tires, for example, a tread and a carcass or for other rubber uses.

REFERENCES:
patent: 3992561 (1976-11-01), Hargis et al.
patent: 4048427 (1977-09-01), Hargis et al.
patent: 4080492 (1978-03-01), DeZarauz

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