Colorless, transparent copolyamides, their preparation, and molded articles made from these copolyamides, their blends or alloys
AssigneeEMS-Inventa AG
InventorPhil Hans Dallas Torre
Life of this patent
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Abstract
Colorless, transparent copolyamides, made up of monomers based on cycloaliphatic diamines and aromatic dicarboxylic acids and a maximum of 20 mol % of further polyamide-forming aliphatic monomers, which have glass transition temperatures of at least 175.degree. C., their blends and alloys, along with the molded articles that can be produced from them and a process for their preparation are proposed.
Claims21
A colorless, transparent copolyamide or blend or alloy thereof with at least one homopolyamide, characterized in that the copolyamide is made up substantially of
- a) at least one cycloaliphatic diamine having from 6 to 24 carbon atoms in substantially equimolar proportion with
- b) at least one aromatic dicarboxylic acid having from 8 to 16 carbon atoms and
- c) up to 1 to 19 mol% of at least one further polyamide-forming monomer, of at least one lactam or .omega.-aminocarboxylic acid,
- wherein the copolyamide has a glass transition temperature T.sub.G of more than 175.degree. C., and the copolyamide or blend or alloy thereof optionally contains additives.
A colorless, transparent copolyamide, or a blend or alloy thereof with at least one homopolyamide, said transparent copolyamide being made up substantially of
- (a) a cycloaliphatic diamine consisting essentially of bis-(3-methyl-4-aminocyclohexyl) methane,
- (b) a substantially equimolar proportion with said diamine of a mixture of isophthalic acid with up to 50 mol% based on the total amount of dicarboxylic acid, of terephthalic acid, and
- (c) 1-19 mol % of at least one further polyamide-forming monomer of at least one lactam or omega-aminocarboxylic acid,
- wherein the copolyamide has a glass transition temperature T.sub.G of more than 175.degree. C.
Dependencies are inferred from the claim text.