Polyamides containing a combination of (1) a phenol, (2) a phosphorus acid salt or ester, (3) a manganese salt, and (4) a dicarboxylic acid as stabilizers

Claim 1

SYNTHETIC POLYAMIDE COMPOSITIONS WHICH ARE SUBSTANTIALLY FREE FROM COLOUR AND A GOOD STABILITY AGAINST DISCOLOURATION BY HEAT AND LIGHT, IN WHICH HAVE BEEN INCORPORATED DURING POLYCONDENSATION (1) BETWEEN 0.02 AND 0.2% OF A COMPOUND SELECTED FROM THE CLASS CONSISTING OF 2,5-DI-TERT-BUTYL-HYDROQUINONE, 2,2''-METHYLENE-BIS-(4METHYL-5-TERT-BUTYL-PHENOL), 2,2''-METHYLENE-BIS-(4-ETHYL-6TERT-BUTYL-PHENOL), AND 4,4''-BUTYLIDENE-BIS-(6-TERT-BUTYL-MCRESOL), (2) BETWEEN 0.05 AND 0.5% OF TRIPHENYL PHOSPHATE, (3) BETWEEN 20 AND 80 PARTS OF MANGANESE PERMILLION PARTS OF SAID POLYAMIDE COMPOSITION IN THE FORM OF A COMPOUND SELECTED FROM THE CLASS CONSISTING OF MANGANOUS LACTATE, MANGANOUS OXALATE, AND MANGANOUS HYPOPHOSPHITE, AND (4) BETWEEN 0.2 AND 1.0% OF A MEMBER OF THE CLASS CONSISTING OF ADIPIC ACID, SEBACIC ACID, AND TEREPHTHALIC ACID, THE PROPORTIONS BEING BASED ON THE TOTAL WEIGHT OF THE COMPOSITION.