公开(公告)号：US3108091A

公开(公告)日：1963-10-22

申请号：US8544961

申请日：1961-01-30

Applicant: BASF AG

Inventor： GERHARD ILLING ,  HELMUT STAHL

IPC: C08K3/00 ,  C08K3/32 ,  C08L77/00

CPC classification number: C08L77/02 ,  C08K3/10 ,  C08K3/32 ,  C08L77/00 ,  C08L77/06 ,  C08L2666/72 ,  C08L2666/82

Abstract: A stabilized polyamide contains as stabilizers 0,5 to 2% by weight of hypophosphoric acid and/or a hypophosphate and 0,001 to 1% by weight of a water soluble cerium (III) salt and/or a water-soluble titanium (III) salt. Specified hydrophosphates are lithium, sodium, potassium, magnesium, calcium, barium, aluminium, cerium, thorium, copper, zinc, titanium, iron, nickel and cobalt hypophosphates. Specified water-soluble cerium (III) and titanium (III) salts are the chlorides, bromides, halides, sulphonates, formates and acetates. Specified polyamides are those derived from caprolactam, caprylic lactam, o -amino-undecanoic acid, the salts of adipic, suberic, sebacic or decamethylene dicarbonic acid with hexamethylene or decamethylene diamine, of heptane dicarboxylic acid with bis-(4-aminocyclohexyl)-methane, of tetramethylene diisocyanate and adipic acid and of aliphatic w-aminoalcohols and dicarboxylic acids each with 4 to 34 carbon atoms between the functional groups. The stabilizers may be added to the polyamides during or after the polycondensation reaction. Delustrants, e.g. cerium dioxide, titanium dioxide, thorium dioxide or ytrium trioxide may also be added to the polyamides. Examples (1) and (2) describe the polymerization of:-(1) hexamethylene diammonium adipate in the presence of disodium dihydrogen hypophosphate hexahydrate and (a) titanium (III) chloride hexahydrate, (b) cerium (III) chloride; (2) caprolactam in the presence of (a) thorium hypophosphate and titanium (III) chloride hexahydrate, whilst in Example (3) polycaprylic lactam is mixed with tetrasodium hypophosphate, titanium (III) acetate and titanium dioxide.