Patent ID: 8003748

Claim:
A polythiourethane comprising: a reaction product of a thiol ester composition comprising: 1) thiol ester molecules prepared from an unsaturated natural source oil, the thiol ester molecules having an average molar ratio of cyclic sulfide groups to thiol groups per thiol ester molecule of between 0.05 and 1; 2) hydroxy thiol ester molecules prepared from an epoxidized unsaturated natural source oil; or 3) crosslinked thiol ester oligomers having at least three thiol ester monomers prepared from an unsaturated natural source oil or three hydroxy thiol ester monomers prepared from an epoxidized unsaturated natural source oil connected by polysulfide linkages having the structure —S Q —, wherein Q is greater than 1; and an isocyanate composition, wherein the polythiourethane has multiple thiourethane groups having a structure