OPTICAL POLYURETHANE RESIN COMPOSITION AND OPTICAL POLYURETHANE RESIN

摘要

An optical polyurethane resin composition which comprises: a polyisocyana te ingredient comprising at least one cyclic polyisocyanate selected from th e group consisting of alicyclic polyisocyanates, araliphatic polyisocyanates , and modifications of these; and a polyol ingredient having an average hydr oxy value of 280-1,240 mg-KOH/g and an average functional-group number of 2- 5, excluding 2 and 5.