Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1983-08-17
1989-07-04
Lieberman, Allan M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525192, 525194, 525196, 526340, C08L 2502, C08L 2510, C08L 5302
Patent
active
048451541
ABSTRACT:
There is disclosed copolymers of aromatic vinyl compounds, e.g., styrene, and conjugated diolefins, e.g., butadiene, possessing a differential content of the aromatic vinyl compound such that in at least one of the end portions of the copolymer the differential content shows a sharp and substantial increase in the direction of the outer extremity of the end portion. Preferred copolymers are styrene-butadiene copolymers having a vinyl content of at least 30%. In special embodiments, the copolymers have a styrene content changing in a portion of no more than 5% of the copolymer chain from a first value to a second value, the second value being at least 25 percentage points greater than the first value, and the portion is present within a 10% terminal portion of the copolymer. The copolymers are useful in the tread portions of tires as tires containing such copolymers in the tread composition have improved rolling resistance and/or grip on wet road surfaces.
REFERENCES:
patent: 3402159 (1968-09-01), Hsieh
patent: 3953543 (1976-04-01), Futamura et al.
patent: 4104332 (1978-08-01), Zelinski
patent: 4105714 (1978-08-01), Trepka et al.
patent: 4334567 (1982-06-01), Bond
Plaste und Kautschuk, Paper of Gomoll and Seide, 16 JG, H.6, 1969 S 412-415.
Blythe Robert J.
Bond Robert
La Heij Gerardus E.
Lieberman Allan M.
Shell Internationale Research Maatschappij B.V.
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