Polyurethane spectacle frames or single parts thereof and process for making

摘要

Disclosed are spectacle frames or single parts thereof having a moderate heat distortion temperature, i.e. approximately 60 DEG to approximately 70 DEG C. The spectacle frames or single parts thereof are composed of a cured polyurethane prepared by the reaction of (1) a mixture of two types of diisocyanates represented by the following formulae (A) and (B): <IMAGE> (A) where R1 is an aliphatic hydrocarbon group of 1 to 12 carbon atoms and R2 and R3 are hydrogen or an aliphatic hydrocarbon group of 1 to 12 carbon atoms, <IMAGE> (B) where X is oxygen or an aliphatic hydrocarbon group having 1 to 5 carbon atoms, with (2) a polyhydroxy compound having a hydroxyl value of at least 150 and an average molecular weight of 300 to 5,000. The ratio in amount of the diisocyanate of type (B) to the total of the two types of diisocyanates (A) and (B) is 0.2-0.7 by mole.