Curable polyene-polythiol compositions

Claim 1

A curable composition useful for obtaining a solid cross-linked polythioether consisting essentially of: 1. A polyene of the formula: ##EQU16## wherein A and B are polyvalent organic radical members free of reactive carbon to carbon unsaturation and are independently selected from the group consisting of aryl, substituted aryl, aralkyl, substituted aralkyl, cycloalkyl, substituted cycloalkyl, alkyl and substituted alkyl containing 1 to 36 carbon atoms and mixtures thereof, said group members can be connected by a chemically compatible linkage selected from the group consisting of --O--, --S--, carboxylate, carbonate, carbonyl, urethane and substituted urethane, urea and substituted urea, amide and substituted amide, amine and substituted amine and hydrocarbon; Z is a divalent chemically compatible linkage selected from the group consisting of ##EQU17## --O-- and --S--; X is a member selected from the group consisting of (a) --(CH 2 ) d --CR'=CHR, (b) --O--(CH 2 ) d --CR'=CHR, (c) --S--(CH 2 ) d --CR'=CHR, (d) --(CH 2 ) d --C.tbd.CR, (e) --O--(CH 2 ) d --C.tbd.CR, (f) --S--(CH 2 ) d --C.tbd.CR; and mixtures thereof; where R and R' each are independently selected from the group consisting of hydrogen and methyl radicals; d, p and q are each integers from 0 to 1; m and n are each integers of at least 1; with m + n from 2 to 22 and r at least 1, and y from 1 to 10; and (2.) A polythiol of the formula: ##EQU18## wherein m and n are each at least 1 and m + n is 2 and 22 and R 3 is a polyvalent organic radical member free of reactive carbon-to-carbon unsaturation and is selected from the group consisting of aryl, substituted aryl, aralkyl, substituted aralkyl, cylcoalkyl, substituted cylcoalkyl, alkyl and substituted alkyl groups containing 1 to 16 carbon atoms and mixtures thereof, the total combined functionality of (a) the reactive carbon-to-carbon bonds per molecule in the polyene and (b) the thiol groups per molecule in the polythiol being greater than 4.