Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1988-06-09
1990-08-14
Lieberman, Allan M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
525237, 526 87, 526 89, 526340, C08L 906, C08L 5302
Patent
active
049488490
ABSTRACT:
There are 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 compolymers are styrene-butadiene copolymers having a vinyl content of at least 30%. In special embodiments, the copolymer 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.
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Blythe Robert J.
Bond Robert
La Heij Gerardus E.
Lieberman Allan M.
Shell Internationale Research Maatschappij B.V.
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