Selectively sulfonated block copolymers/extender oils
AssigneeShell Oil Company
InventorsLorelle A, Pottick, Carl L. Willis, Richard Gelles
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Abstract
Blends of a sulfonated thermoplastic block polymer and a compatible extender oil are described. The block copolymer is first selectively hydrogenated and thereafter modified by grafting sulfonic acid containing functional groups primarily in the alkenyl arene blocks. Neutralization of the acid groups to a metal salt is preferred to prepare oil extended blends that retain substantial amounts of non-extended mechanical properties.
Claims8
A thermoplastic composition, comprising a blend of 10% to 75% by weight of an aliphatic hydrocarbon oil and 90% to 25% by weight of functionalized, selectively hydrogenated block copolymer to which has been grafted sulfonic functional groups, the block copolymer having
- (a) at least one alkenyl arene polymer block A and
- (b) at least one substantially completely, hydrogenated conjugated diene polymer block B,
- (c) wherein substantially all of the sulfonic functional groups are grafted to said copolymer on said A block, and
- (d) wherein the composition retains from 10% to 11% of the tensile strength of the block copolymer at room temperature.
The composition according to claim 13, wherein the A--B--A polymer is a polystyrene-hydrogenated polybutadiene-polystyrene polymer.
Dependencies are inferred from the claim text.