Diene polymer obtained by adding a tin compound in the polymeriz

Details Diene polymer obtained by adding a tin compound in the polymeriz Diene polymer obtained by adding a tin compound in the polymeriz

1993-06-03

1996-12-24

Teskin, Fred

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524571, 524575, 5253329, 5253332, 525352, 525370, 525371, 525374, 526 86, 526173, 526176, 526335, 526340, C08L 900, C08K 304, C08F 416, C08F 448

Patent

active

055874207

ABSTRACT:
In one of several methods of producing polybutadiene or a butadiene-styrene copolymer with an organolithium initiator, an organotin compound such as tetraallyltin, tetrabenzyltin and tetraphenyltin is added to the polymerization system in a period of growth of the polymer chain between a time immediately after a start of the polymerization to a time before an end of the polymerization. In another of the methods, tin tetrachloride or tin dichloride is added at an earlier time after a start of the polymerization. A polymer comprising a considerable amount of high molecular weight polymer containing the chain having a tin-carbon linkage is formed. A rubber composition for tires comprises specified amounts of the polymer described above, natural rubber, carbon black and vulcanizing agents. The rubber composition has a small loss factor and excellent fracture properties. The rubber composition provides a tire having excellent wear resistance, low rolling resistance and wet skid resistance without impairing fracture properties. In addition, the rubber composition is inexpensive.

REFERENCES:
patent: 3468972 (1969-09-01), Hsieh
patent: 3536691 (1970-10-01), Trepka et al.
patent: 4145998 (1979-03-01), Farrar
patent: 4616069 (1986-10-01), Watanabe et al.
patent: 4845165 (1989-07-01), Halasa et al.
patent: 5268439 (1993-12-01), Hergenrother et al.
Hackh's Chemical Dictionary, 4th ed., Mc-Graw Hill, Inc., N.Y., pp. 92, 22, 510 (1969).

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