Patent ID: 9057820
Filing Date: 2015-06-16
Classification: C08G,G02B

Abstract:
1. A thiourethane optical lens element resin composition for preparing an optical lens element of high impact strength, the composition including: 45% to 55% by weight of the composition of dicyclohexylmethane diisocyanate; 45% to 55% by weight of the composition of polythiol compound selected from the group consisting of pentaerythritol tetrakis-mercaptopropionate, trimethylolpropane tri(3-mercaptopropionate) and mixtures thereof; and 0.3% to 0.7% by weight of the composition of dibutyltin dichloride thermal catalyst; wherein when cast as 2 mm thick 6 based plano lenses, the composition provides an impact strength of greater than about 1.70 J without coating.