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US 4,060,502 AGranted
Sponge rubber rug underlay having improved load bearing capacity
AssigneeThe General Tire & Rubber Company
InventorRichard E. Benton
Life of this patent
Estimating the term…
Abstract
A composition is provided for use in flexible sponge rubber rug underlay of a type including about 100 parts of natural or synthetic rubber, from about 100 to about 300 parts of a reinforcing filler, and from about 50 to about 200 parts of oil. The improvement in the composition comprises from about 10 to about 40 parts of the natural or synthetic rubber being replaced by an approximately equal number of parts of a finely divided vinyl chloride polymer or copolymer. The present invention may also provide a sponge rubber of lower cost for the same apparent density.
Claims7
A flexible sponge rubber comprising
- a. about 100 parts of a mixture consisting of rubber and from 10 to 40 parts of a resin selected from the group consisting of polyvinyl chloride and copolymers of chloride
- b. from about 100 to about 300 parts of a reinforcing filler and
- c. from about 50 to about 200 parts of oil.
Dependencies are inferred from the claim text.