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US 4,791,170 AGranted
Rubber compositions
AssigneeNippon Oil Co., Ltd.
InventorsMasaharu Makino, Hisatake Satoh
Life of this patent
Estimating the term…
Abstract
Rubber compositions are disclosed which essentially comprise ethylene/alpha-olefin rubbers and specified amounts of a selected class of aromatic hydrocarbon resins containing a phenolic hydroxyl group and having specified hydroxyl numbers and softening points. The composition is highly roll-retentive and sufficiently tacky in an unvulvcanized state with vulcanization speed and vulcanizate quality held at an optimum level.
Claims9
A rubber composition comprising:
- (a) a starting rubber comprising ethylene and an alpha-olefin;
- and
- (b) an aromatic hydrocarbon resin containing a phenolic hydroxyl group and having a hydroxyl number of 30-150 and a softening point of 50.degree.-180.degree. C., said hydrocarbon resin being present in an amount of 0.5-30 parts by weight based on 100 parts by weight of said starting rubber, said hydrocarbon resin being a polymeric material derived from copolymerization of an aromatic petroleum or coal fraction distilling at from 140.degree.-240.degree. C. with a phenol in the presence of an effective catalyst.
Dependencies are inferred from the claim text.