Patent ID: 7767779
Filing Date: 2010-08-03
Classification: C08G,G02B

Abstract:
1. A transparent, non-elastomeric, polythiourethane/urea material comprising the reaction product of: (a) at least one (α, ω)-diiso(thio)cyanate polysulfide prepolymer, said prepolymer being free from disulfide (—S—S—) linkage; and (b) at least one aromatic primary diamine, in an equivalent molar ratio amine function/iso(thio)cyanate function (NH wherein the (α, ω)-diiso(thio)cyanate polysulfide prepolymer is the reaction product of at least one cycloaliphatic or aromatic (α, ω) -diiso(thio)cyanate and at least one (α, ω)-dithiol prepolymer, said (α, ω)-dithiol prepolymer being a polysulfide or a mixture of polysulfides.