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US 5,310,814 AGranted
Viscosity modifier polybutadiene polymers
AssigneeExxon Chemical Patents Inc.
InventorsMark J. Struglinski, Gary W. VerStrate, Lewis J. Fetters
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Abstract
The present invention relates to hydrogenated polybutadiene comprising monomeric units of 1,4-butadiene and 1,2-butadiene addition products. The copolymer is hydrogenated and comprises at least 10% by weight of at least one crystallizable segment and at least one low crystallinity segment.
Claims18
A composition comprising (a) oil;
- and (b) at least one polybutadiene block copolymer comprising polymerization products derived from monomeric units of 1,4-butadiene and 1,2-butadiene, the copolymer being hydrogenated and comprising at least 10 percent by weight of at least one crystallizable segment comprised of methylene units and having an average methylene content corresponding to a 1,4-polybutadiene content of at least about 20 mole percent, and more than one low crystallinity segment comprised of methylene units and substituted methylene units and having an average methylene content less than about 75 mole percent.
Dependencies are inferred from the claim text.