Patent ID: 6911492
Filing Date: 2005-06-28
Classification: C08K,C08L

Abstract:
1. A thermoformable polymer blend that resists surface discoloration when exposed to acidic environments comprising: (A) from about 20% to about 95% by weight a polymer package comprising a blend of: (Ai) from about 45% to about 90% by weight of one or more homopolymers and/or copolymers of polypropylene; (Aii) from about 8% to about 45% by weight of one or more polymers of vinyl aromatic monomers; (Aiii) from about 3% to about 20% of one or more block polymers; and (Aiv) from about 0.1% to about 10% by weight of one or more styrene-maleic anhydride copolymers; (B) from about 5% to about 70% by weight of a surface treated mineral filler; (C) up to about 1.0% by weight of an antioxidant package; (D) from about 0.001 to about 1.0% by weight of a zinc containing lubricant system; and (E) optionally from about 0.001 to about 3.5% by weight of a colorant system including titanium dioxide and blue, red, and yellow pigments.