Patent ID: 9340669
Filing Date: 2016-05-17
CPC Classification: B24B,B29D,C08K,C08L,G02B,Y10T

Claim Text:
1. A composition in the form of a blocking agent composition for fixing blanks for ophthalmic or optical lenses, wherein the composition comprises a mixture, wherein the mixture comprises: (a) at least one polyol, wherein the polyol comprises units derived from bisphenol A and dimethylolpropionic acid, wherein the composition comprises the polyol in amounts of  from 5 to 50% by weight, based on the composition, and (b) at least one organic polyester, wherein (i) the polyester is selected from linear copolyesters comprising primary hydroxyl functionalities, and (ii) the composition comprises the organic polyester in amounts of from 50 to 95% by weight, based on the composition.