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US 3,945,977 AGranted
Hard rubber compositions with high extender oil levels
AssigneePhillips Petroleum Company
InventorKenneth E. Snavely
Life of this patent
Estimating the term…
Abstract
A vulcanizable composition is provided which comprises a butadiene-styrene A-B block copolymer having from 30 to 50 weight percent block polystyrene, 40 to 100 php of an extender oil and 20 to 100 php of carbon black.
Claims8
A vulcanizable composition characterized by a high extender oil level comprising:
- a. a butadiene-styrene block copolymer having the configuration A-B wherein A is an essentially homopolymer block of styrene and B is selected from the group consisting of an essentially homopolymer block of butadiene and a random copolymer block of butadiene and styrene, wherein said block copolymer contains from 30 to 75 weight percent styrene, said block A comprises 30 to 50 weight percent of said block copolymer and the molecular weight of said block copolymer is in the approximate range of 50,000 to 700,000;
- b. from 40 to 100 parts by weight of an extender oil selected from the group consisting of aromatic oils, aliphatic oils, naphthenic oils and mixtures thereof, per 100 parts by weight of said block copolymer;
- and
- c. from 20 to 100 parts by weight of carbon black per 100 parts by weight of said block copolymer.
1 more element
Dependencies are inferred from the claim text.