Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1985-05-15
1986-03-18
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
525314, 526340, C08F 448
Patent
active
045770026
ABSTRACT:
The invention relates to elastomeric copolymers of an aromatic vinyl compound and a conjugated diene, suitable for use in the tread portion of a pneumatic tire, which copolymers have a vinyl content of at least 30% by weight and comprise at least two polymer chains coupled to one another having a differential content of the aromatic vinyl compound at the ends of the copolymer which changes in a portion of not more than 5% of each polymer chain from a first value to a second value which is at least 25 percentage points higher than the first value, and said portion lies within the free terminal 10% portion of the copolymer chain (as determined by monomer conversion); their preparation and their use in tread portions of tires. The process of the invention is characterized by employing as structure modifier a compound of formula
REFERENCES:
patent: 3402159 (1968-09-01), Hsieh
patent: 4089913 (1978-05-01), Miki
patent: 4367325 (1983-01-01), Takeuchi
patent: 4396743 (1983-08-01), Fujimaki
patent: 4397994 (1983-08-01), Takeuchi
patent: 4433109 (1984-02-01), Takeuchi
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