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

1991-11-18

1993-10-19

Kight III, John

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

Synthetic resins

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

525 95, 525 98, 525 99, 525236, C08L 900, C08L 4700, C08L 5302

Patent

active

052546284

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 aromatic nitrile coumpounds.
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 aromatic nitrile 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.

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