Chemistry of hydrocarbon compounds – Unsaturated compound synthesis – By addition of entire unsaturated molecules – e.g.,...
Patent
1992-12-17
1994-02-22
Jagannathan, Vasu S.
Chemistry of hydrocarbon compounds
Unsaturated compound synthesis
By addition of entire unsaturated molecules, e.g.,...
585508, 526173, 526337, 526340, C07C 240, C08F29702
Patent
active
052889378
ABSTRACT:
Block and random straight chain and star-branched liquid copolymers of two different conjugated dienes, the residual ethylenic unsaturation of the polymerized units of one of which, e.g. isoprene, is less readily hydrogenated than that of the other diene, e.g., butadiene. In the case of block copolymers, the terminal blocks of a straight chain copolymer or the blocks of the free ends of the branches of a star-branched copolymer are composed of the less readily hydrogenated diene polymer while the more readily hydrogenated diene polymer is in the form of central blocks of a straight chain copolymer or interior blocks of the branches of a star-branched copolymer. These copolymers may be selectively hydrogenated so that substantially all of the residual ethylenic unsaturation of the more readily hydrogenated polymerized diene units are hydrogenated while enough residual ethylenic unsaturation of the less readily hydrogenated polymerized diene units remains unhydrogenated to provide sufficient sites for subsequent vulcanization or chemical modification. The combination of elastomeric properties and oxidative stability possessed by the polymers of this invention makes them suitable for many and uses such as sealants, caulks and adhesives.
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Coolbaugh Thomas S.
Loveless Frederick C.
Matthews Demetreos N.
Rudnick Leslie R.
Jagannathan Vasu S.
Keen M. D.
McKillop A. J.
Mobil Oil Corporation
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