Composition for pneumatic tires

Details Composition for pneumatic tires Composition for pneumatic tires

1985-03-25

1986-09-09

Bleutge, John C.

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

Synthetic resins

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

525196, 525237, 525314, 525901, C08F29900

Patent

active

046110305

ABSTRACT:
A composition for pneumatic tires including more than 30% of star shaped styrene-butadiene copolymers by solution polymerization with or without one or more types of natural rubbers or diene series synthetic rubbers. The composition value X of the solution polymerization star shaped SBR is obtained by the following equation. ##EQU1## wherein BR is the butadiene component and the vinyl content is the content of 1, 2 bonded butadiene in butadiene component. The value X falls in the range of the lower limit of 26 to the upper limit of 39. And the coupling efficiency of the solution polymerization star shaped SBR is more than 40%.

REFERENCES:
patent: 3393182 (1968-07-01), Trepka
patent: 3639517 (1972-02-01), Kitchen
patent: 3980624 (1976-09-01), Minekawa
patent: 3985830 (1976-10-01), Fetters
patent: 4163765 (1979-08-01), Moczygemba
patent: 4307218 (1981-12-01), Bingham
patent: 4396743 (1983-08-01), Fujimaki
patent: 4417027 (1983-11-01), Kan
patent: 4433109 (1984-02-01), Takeuchi
patent: 4553578 (1985-11-01), Vitus
patent: 4575534 (1986-03-01), Oshima

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