vulkbar elast comprising a copolymer of permanent random fordelade structural units herledda from thiodiethanol and diols, and still for framstellning of elasterna and anvendning of them

摘要

A vulcanizable elastomer composition is provided comprising a copolymer represented by the formula: H-- OG --n OH wherein -- OG --consists of randomly alternating structural units (I) and (II) -- OC2H4SC2H4 --(I) -- OR --(II) wherein R is one or more radicals which are the residues remaining on removal of two aliphatic hydroxyl groups of diols selected from (a) saturated linear, branched chain or cyclic diols and (b) linear, branched chain or cyclic diols containing external unsaturation having an allylic hydrogen atom; being characterized in that n is an integer sufficient to provide a molecular weight at least about 8000; the molar ratio of structural units (I) to structural units (II) being not less than 1:1; and containing from about 1 to 10 mole percent of the total of (I) and (II) of said linear, branched chain or cyclic diol containing external unsaturation.