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US 4,049,595 AGranted
Block copolymer compositions
AssigneeShell Oil Company
InventorRichard J. G. Dominguez
Life of this patent
Estimating the term…
Abstract
Block copolymer compositions employed for use in footwear articles show improved performance when the usual crystal grade polystyrene is replaced with high impact polystyrene.
Claims10
A polymeric composition comprising:
- a. 100 parts by weight of a block copolymer having at least two monoalkenyl arene polymer end blocks A and at least one elastomeric conjugated diene mid block B, each block A having an average molecular weight between about 5,000 and about 125,000 and each block B having an average molecular weight between about 15,000 and about 250,000, said blocks A comprising 8-65% by weight of the copolymer;
- b. 5-125 parts by weight of a high impact polystyrene resin containing from about 1-35 weight percent elastomeric component, said high impact polystyrene having a weight average molecular weight of over about 70,000;
- c. 5-175 parts by weight of a hydrocarbon rubber extending oil;
- and
- d. 0-250 parts by weight of a finely divided filler.
2 more elements
A footwear composition having improved elephant hide, cycle time, mar resistance, and flex-crack resistance comprising:
- a. 100 parts by weight of a block copolymer having at least two monoarene polymer end blocks A and at least one elastomeric conjugated diene mid block B, each block A having an average molecular weight between about 5,000 and about 125,000 and each block B having an average molecular weight between about 15,000 and about 250,000, said blocks A comprising 8-65% by weight of the copolymer;
- b. 5-125 parts by weight of a high impact polystyrene resin containing from about 1-35 weight percent elastomeric component, said high impact polystyrene having a weight average molecular weight of over about 70,000;
- c. 5-175 parts by weight of a hydrocarbon rubber extending oil;
- and
- d. 0-250 parts by weight of a finely divided filler.
2 more elements
Dependencies are inferred from the claim text.