Patent ID: 8822623

Claim:
A transparent, non-elastomeric, poly(thio)urethane/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 2 /NCX, X═O, S) ranging from 0.5 to 2, said aromatic primary diamine being free from disulfide (—S—S—) linkage, wherein the (α, ω)-diiso(thio)cyanate polysulfide prepolymer is the reaction product of at least one cycloaliphatic or aromatic diiso(thio)cyanate and at least one (α, ω)-diol prepolymer, and wherein the (α, ω)-diol prepolymer contains at least one sulfur atom in its chain.