Diene polymers having reduced hysteresis and improved raw viscos

Details Diene polymers having reduced hysteresis and improved raw viscos Diene polymers having reduced hysteresis and improved raw viscos

1991-12-20

1993-05-11

Lipman, Bernard

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

Synthetic resins

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

525290, 5253378, 5253329, 5253331, 5253332, 525383, C08F 800

Patent

active

052101444

ABSTRACT:
Diene polymers or copolymers having improved raw polymer viscosity and reduced hysteresis in the cured and carbon black reinforced state are provided. These diene polymers or copolymers comprise a mixture of diene polymer or copolymer chains containing carbon-tin bonds in the main polymer or copolymer chains and diene polymer or copolymer chains containing terminals derived from fused-ring polynuclear aromatic compounds.
The diene polymer or copolymers are prepared by first coupling a portion of the living diene polymer or copolymer chains obtained by anionic polymerization using a tin polyhalide coupling agent and then terminating the remaining living diene polymer or copolymer chains using fused-ring polynuclear aromatic compounds. The resultant diene polymers or copolymers have improved raw polymer viscosity and when compounded with carbon black and cured have reduced hysteresis properties. The polymers can be utilized to form elastomer compositions for tire treads having reduced rolling resistance.

REFERENCES:
patent: 4297451 (1981-10-01), Uraneck et al.

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