Patent ID: 7022764
Filing Date: 2006-04-04
Classification: C08L

Abstract:
1. A transparent permanent electrostatic dissipating composition comprising in combination; a transparent aromatic polycarbonate resin, a miscible transparent cycloaliphatic copolyester, and a sufficient amount of polyetheresteramide polymer for imparting electrostatic dissipative properties to said composition, said aromatic polycarbonate, said cycloaliphatic copolyester, and said polyetheresteramide polymer, each having a predetermined index of refraction wherein said index of refraction of said polyetheresteramide polymer has a refractive index value between said polycarbonate resin and said cycloaliphatic copolyester resin, said polycarbonate resin and said cycloaliphatic copolyester resin are present in said electrostatic composition for substantially matching the index of refraction of said polyetheresteramide polymer, said cycloaliphatic copolyester comprises the reaction product selected from the group consisting of: (1) at least 80 weight % of cycloaliphatic diol with the remainder, if any, being a linear aliphatic diol, or a combination of a linear aliphatic diol and a linear aliphatic diacid, or chemical equivalents of the above, (2) at least 80 weight % of a cycloaliphatic dicarboxylic acid with the remainder, if any, being a linear aliphatic diacid, or a combination of a linear aliphatic diacid and a linear aliphatic diol or chemical equivalents of above, and (3) a mixture of at least 80 weight % of a cycloaliphatic diol and at least 80 weight % of a cycloaliphatic dicarboxylic acid with the remainder, if any, being a linear aliphatic diol or a linear aliphatic diacid or a mixture of the two, or chemical equivalents of the above; and wherein the weight ratio of cycloaliphatic copolyester to polycarbonate is from about 2.0 to about 1.6.