Patent ID: 9453106
Filing Date: 2016-09-27
CPC Classification: C08G,C08L

Claim Text:
1. A transparent, scratch-resistant and tough copolyamide moulding compound, producible by polycondensation of a cycloaliphatic diamine or a mixture of two or more cycloaliphatic diamines, wherein said cycloaliphatic diamine or a mixture of two or more cycloaliphatic diamines is selected from the group consisting of 3,3′-dimethyl-4,4′-diaminodicyclohexylmethane (DMDC), 3,3′,5,5′-tetramethyl-4,4′-diaminocyclohexylmethane, 2,2′,3,3′-tetramethyl-4,4′-diaminocyclohexylmethane and norbornanediamine with a carboxylic acid mixture comprising (i) at least one aliphatic dicarboxylic acid with 6 to 18 carbon atoms and (ii) a mixture of isophthalic acid and terephthalic acid, a mixture of isophthalic acid and naphthalene dicarboxylic acid, or a mixture of isophthalic acid and terephthalic acid and naphthalene dicarboxylic acid, wherein in (ii), the molar ratio of isophthalic acid to terephthalic acid, the molar ratio of isophthalic acid to naphthalene dicarboxylic acid, or the molar ratio of isophthalic acid to terephthalic acid and naphthalene dicarboxylic acid is 5:1 to 1:1.2, the copolyamide moulding compound having a scratch-resistance of greater than or equal to grade H, measured according to ASTM D3363-05, wherein the polycondensation is carried out on a polycondensation mixture consisting of a) 15 to 38% by mol of the at least one aliphatic dicarboxylic acid (i) with respect to the total number of moles of the diamine or diamines and the diacids in the polycondensation mixture, b) 12 to 35% by mol of the mixture (ii) of aromatic dicarboxylic acids with respect to the total number of moles of the diamine or diamines and the diacids in the polycondensation mixture, and c) 50% by mol of said diamine or mixture of diamines with respect to the total number of moles of the diamine or diamines and the diacids in the polycondensation mixture.