Curable liquid polysulfide polymer based sealants

A process for the enhancement of adhesiveness of a sealant composition based on a curable liquid polysulfide polymer of the formula HS--(RSS).sub.n --RSH wherein R is a hydrocarbon, oxahydrocarbon, or thiahydrocarbon radical and n is from 4 to about 23, which comprises the admixture with the uncured sealant, in an amount effective to insure adequate bonding of the uncured sealant to a substrate, of a butyl rubber, a polybutene polymer, or a mixture thereof.

A cured rubber-like polymer derived from a composition comprising a curable liquid polysulfide polymer of the formula HS--(RSS).sub.n --RSH wherein R is a hydrocarbon, oxahydrocarbon, or thiahydrocarbon radical and n is from 4 to about 23, an oil absorbent filler, an oxidative curing agent, and in an amount effective to insure bonding of said cured rubber-like polymer to a substrate, a butyl rubber, a polybutene polymer, or a mixture thereof.

In an improved article of manufacture requiring a sealant on at least one surface thereof, the improvement which comprises said sealant being based on a curable liquid polysulfide polymer of the formula HS--(RSS).sub.n --RSH wherein R is a hydrocarbon, oxahydrocarbon, or thiahydrocarbon radical and n is 4 to about 23, and containing as an adhesive additive a butyl rubber, a polybutene polymer, or a mixture thereof.