Patent ID: 7622526

Claim:
A thermoset plastic material comprising a three-dimensional matrix containing sulphur atoms and at least one antiplasticizing additive that does not react with said matrix, wherein the three-dimensional matrix is a polythiourethane matrix or a polyepisulfide matrix, and wherein the antiplasticizing additive is a dialkyl sulfide, diaryl sulfide, dialkylaryl sulfide, alkylaryl sulfide, arylalkyl aryl sulfide, aryl alkylsilane sulfide, S-arylthioalkylate, bis-arylthioalkyl, a compound containing a thiourea group, a compound containing one urethane group, or a compound containing a carbonyl group of formula: wherein R 1 and R 2 are independently an alkyl radical, a cycloalkyl radical, an aryl radical, an arylalkyl radical, or a radical of formula: wherein R is an alkyl radical or a trialkyl radical.