Patent ID: 6277911
Filing Date: 2001-08-21
Classification: C08G,C08L

Abstract:
A transparent, colorless, amorphous copolyamide or blends or alloys thereof with at least one further polyamide, wherein the copolyamide is made from at least one alkyl-substituted cycloaliphatic diamine having from 14 to 22 carbon atoms selected from the group consisting of 2,6-bis(aminomethyl)-norbornane; 3-aminomethyl-3,5,5-triemthylcyclohexylamine; bis-(4-aminomethylcyclohexyl); diaminomethyl-tricyclodecane; 1,3-bis-(aminomethyl)-dicyclohexane; bis-(4-amino-3-methyl-2-2-ethylcyclohexyl)-methane; bis-(4-amino-3,5-diethylcyclohexyl)-methane; 2,2-bis-1,4-bis-(aminomethyl)-dicyclohexane;and at least one unbranched aliphatic dicarboxylic acid having 7 to 14 carbon atoms,together with at least one aromatic dicarboxylic acid, which aromatic dicarboxylic acid is present in an amount of not more than 20 mol %,wherein the copolyamides have relative solution viscosity of more than 1.6;wherein said at least one further polyamide is selected from the group consisting of homopolyamides and transparent copolyamides;and wherein standardized test specimens made from said copolyamide of blend or alloy thereof have an alternate bending strength of more than 600,000 cycles at 23.degree. C.