Hydrogenated block copolymers having varying sizes of hydrogenated vinyl aromatic blocks
AssigneeThe Dow Chemical Company
InventorsStephen F. Hahn, Glenn H. Fredrickson, Cora M. Leibig, Molly T. Reinhardt
Life of this patent
Estimating the term…
Abstract
The present invention is a composition comprising an alternating hydrogenated block copolymer having at least two hydrogenated vinyl aromatic polymer blocks and at least one conjugated diene polymer block, wherein the number average molecular weights (Mn) of each block can be different.
Claims12
An alternating hydrogenated block copolymer of the structure ABA′BA, wherein A and A′ are hydrogenated vinyl aromatic polymer blocks and B is a conjugated diene polymer block, characterized in that A′ differs from the Mn of A by a factor of at least 1.5, and A and A′ have a hydrogenation level of greater than 90 percent and B blocks have a hydrogenation level of greater than 99 percent.
Dependencies are inferred from the claim text.