Patent ID: 8114929

Claim:
A composition comprising a clear thermoplastic blend comprising: (a) from 15 to 40 wt % of a first polycarbonate component having a weight average molecular weight ranging from 18,000 to 25,000 grams/mole, as measured by Gel Permeation Chromatography GPC using polystyrene standards; (b) from 5 to 55 wt % of a second polycarbonate component having a weight average molecular weight ranging from 32,000 to 40,000 grams/mole, as measured by Gel Permeation Chromatography GPC using polystyrene standards; (c) from 15 to 35 wt %, based on the total weight of the composition, of a polyester component that is poly(1,4-cyclohexanedimethylene terephthalate); (d) from 0.01 to 0.5 wt % of a compatibilizing carboxy reactive component consisting of an epoxy polymer comprising at least one epoxy-functional (meth)acrylic monomer and at least one-non-functional styrenic and (meth)acrylic monomer; wherein the polycarbonate component and the polyester component are present in sufficient proportions to form a molding composition capable of being molded into an article that exhibits transparency and structural integrity after the article is exposed to a caustic aqueous environment for at least 70 hours, wherein the temperature ranges from 70° C. to 90° C.