| abstract |
(57) [Problem] To use a polyurethane elastomer as a molding material for an optical lens, it has sufficient discoloration resistance and durability, has a long pot life, and can take sufficient time for casting. An object of the present invention is to provide a polyurethane resin material composition for casting. SOLUTION: In the casting polyurethane resin material composition comprising a polyisocyanate, a polyhydroxy compound and an aromatic polyamine, the polyisocyanate is 4,4′-methylene-bis (cyclohexyl isocyanate) or isophorone diisocyanate; The polyhydroxy compound has an average molecular weight of 700 to 1200 A polyether diol or a polyester diol or a mixture thereof, wherein the aromatic polyamine is A polyurethane resin material composition for casting, which is 4,4'-methylene-bis (2-chloroaniline). |