Preparation of alkyl mercaptocarboxylate/dialkyl...

Details Preparation of alkyl mercaptocarboxylate/dialkyl... Preparation of alkyl mercaptocarboxylate/dialkyl...

C - Chemistry, Metallurgy

07

C

402/190, 260/486

C07C 149/20 (1980.01)

Patent

CA 1107756

Abstract of the Disclosure ~ n olefinically unsaturated alkyl carboxylate is reacted with hydro- gen sulfide in the presence of a lower alkanol using an addition catalyst with water and/or sulfur cocatalyst to give an alkyl mercaptocarboxylate/- dialkyl thiodicaboxylate mixture having a high proportion of the mercapto- carboxylate. If sulfur is contained in the cocatalyst, dialkyl dithiodi- carboxylates are also formed The resulting mixture on transesterification with a poly(oxyalkylene)-polyol gives a poly(oxyalkylene)-polyester-poly(mono- sulfide)-polythiol or a poly(oxyalkylene)-polyester-poly(monosulfide)- poly(disulfide)-polythiol having a good balance of properties.

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