Foam rubber polyblend
AssigneeMonsanto Company
InventorsAlbert W. Morgan, Roland G. Ribaudo
Life of this patent
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Abstract
Foamed polyblends comprising a filled styrene-butadiene rubber are rendered attractively flame-resistant (e.g. for use as carpet underlay) without loss of "green strength" needed during processing (e.g. in a Banbury mixer) by blending therewith about 10-50 parts per hundred, based on the rubber, of a pre-fused vinyl chloride polymer plastisol.
Claims30
A foamed polyblend composition comprising a filled styrene-butadiene rubber blended with between about 10 and about 50 parts per hundred by weight, based on said rubber, of a vinyl chloride polymer plastisol which has been fused before being blended with said rubber, the weight ratio of said plastisol to the filler in said rubber being between about 0.09 and about 0.25.
A process for producing a flame-resistant styrene-butadiene foam rubber which comprises blending styrene-butadiene rubber with from about 10 to about 50 parts per hundred by weight, based on said rubber, of a vinyl chloride polymer plastisol which has been fused before being blended with said rubber.
A process which comprises preparing a vinyl chloride polymer plastisol, fusing said plastisol at a temperature of at least about 140.degree. C., blending about 10 to 50 parts by weight of the fused plastisol with about 100 parts by weight of a styrene-butadiene rubber containing a filler, and foaming the resulting blend.
Dependencies are inferred from the claim text.