Patent ID: 9290629
Filing Date: 2016-03-22
CPC Classification: A61L,C08F,C08J,C08K,C08L

Claim Text:
1. A process for producing an (ultra)high molecular weight polyethylene ((U)HMWPE) article comprising: (a.) forming a composition by incorporating a stabilizer consisting of one or more Hindered Amine Light Stabilizers selected from the group consisting of 2,2,6,6-tetramethyl-4-piperidone; 2,2,6,6-tetramethyl-4-piperidinol; bis-(1,2,2,6,6-pentamethylpiperidyl)-(3′,5′-di-tert-butyl-4′-hydroxybenzyl) butylmalonate; di-(2,2,6,6-tetramethyl-4-piperidyl) sebacate; oligomer of N-(2-hydroxyethyl)-2,2,6,6-tetramethyl-4-piperidinol and succinic acid; bis-(2,2,6,6-tetramethyl-4-piperidinyl) succinate; bis-(1-octyloxy-2,2,6,6-tetramethyl-4-piperidinyl) sebacate; bis-(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate; N,N′-bis-(2,2,6,6-tetramethyl-4-piperidyl) hexane-1,6-diamine; N-butyl-2,2,6,6-tetramethyl-4-piperidinamine; 2,2′-[(2,2,6,6-tetramethylpiperidinyl)imino]-bis-[ethanol]; poly((6-morpholine-S-triazine-2,4-diyl)(2,2,6,6-tetramethyl-4-piperidinyl)-iminohexamethylene-(2,2,6,6-tetramethyl-4-piperidinyl)-imino); 5-(2,2,6,6-tetramethyl-4-piperidinyl)-2-cycloundecyloxazole); 8-acetyl-3-dodecyl-7,7,9,9-tetramethyl-1,3,8-triazaspiro(4,5)decane-2,4-dione; polymethylpropyl-3-oxy[4(2,2,6,6-tetramethyl)piperidinyl)siloxane; copolymer of α-methylstyrene-N-(2,2,6,6-tetramethyl-4-piperidinyl)maleimide and N-stearylmaleimide; 1,2,3,4-butanetetracarboxylic acid, polymer with beta,beta,beta′,beta′-tetramethyl-2,4,8,10-tetraoxaspiro[5.5]undecane-3,9-diethanol, 1,2,2,6,6-pentamethyl-4-piperidinyl ester; 2,4,8,10-tetraoxaspiro[5.5]undecane-3,9-diethanol,beta,beta,beta′,beta′-tetramethyl-, polymer with 1,2,3,4-butanetetracarboxylic acid, 2,2,6,6-tetramethyl-4-piperidinyl ester; D-glucitol, 1,3:2,4-bis-O-(2,2,6,6-tetramethyl-4-piperidinylidene)-; oligomer of 7-oxa-3,20-diazadispiro[5.1.11.2]heneicosan-21-one,2,2,4,4-tetramethyl-20-(oxiranylmethyl); propanedioic acid, [(4-methoxyphenyl)methylene]-bis(1,2,2,6,6-pentamethyl-4-piperidinyl) ester; formamide, N,N′-1,6-hexanediylbis[N-(2,2,6,6-tetramethyl-4-piperidinyl; 1,3,5-triazine-2,4,6-triamine, N,N′″-[1,2-ethanediylbis[[[4,6-bis[butyl(1,2,2,6,6-pentamethyl-4-iperidinyl)amino]-1,3,5-triazine-2-yl]imino]-3,1-propanediyl]]-bis[N′,N″-dibutyl-N′,N″-bis(1,2,2,6,6-pentamethyl-4-piperidinyl); 1,5-dioxaspiro (5,5) undecane 3,3-dicarboxylic acid, bis (2,2,6,6-tetramethyl-4-piperidinyl) ester; 1,5-dioxaspiro (5,5) undecane 3,3-dicarboxylic acid, bis (1,2,2,6,6-pentamethyl-4-peridinyl) ester; N-2,2,6,6-tetramethyl-4-piperidinyl-N-amino-oxamide; 4-acryloyloxy-1,2,2,6,6-pentamethyl-4-piperidine; 1,3-benzenedicarboxamide,N,N′-bis(2,2,6,6-tetramethyl-4-piperidinyl); 3-dodecyl-1-(2,2,6,6-tetramethyl-4-piperidyl)-pyrrolidin-2,5-dione; 1,3-Propanediamine, N,N-1,2-ethanediylbis-,polymer with 2,4,6-trichloro-1,3,5-triazine, reaction products with N-butyl-2,2,6,6-tetramethyl-4-piperidinamine; 1,1′-(1,2-ethane-di-yl)-bis-(3,3′,5,5′-tetra-methyl-piperazinone); 1,1′,1″-(1,3,5-triazine-2,4,6-triyltris ((cyclohexylimino)-2,1-ethanediyl)tris(3,3,5,5-tetramethylpiperazinone); 1,1′,1″-(1,3,5-triazine-2,4,6-triyltris((cyclohexylimino)-2,1-ethanediyl)tris(3,3,4,5,5-tetramethylpiperazinone); 1,2,3,4-Butanetetracarboxylic acid, tetrakis(2,2,6,6-tetramethyl-4-piperidinyl) ester; 1,2,3,4-Butane-tetra-carboxylic acid, 1,2,3-tris-(1,2,2,6,6-penta-methyl-4-piperidyl)-4-tridecylester; mixture of esters of 2,2,6,6-tetra-methyl-4-pipiridinol and several fatty acids; Propanedioic acid, [(4-methoxyphenyl)methylene]-,bis(2,2,6,6-tetramethyl-4-piperidinyl) ester; 3-Dodecyl-1-(2,2,6,6-tetramethyl-4-piperidyl)-pyrrolidin-2,5-dione; 3-Dodecyl-1-(1,2,2,6,6-pentamethyl-4-piperidyl)-pyrrolidin-2,5-dione; 1,2,3,4-Butanetetracarboxylic acid, tetrakis(1,2,2,6,6-pentamethyl-4-piperidinyl)ester; 1,2,3,4-Butane-tetra-carboxylic acid, 1,2,3-tris-(2,2,6,6-tetra-methyl-4-piperidyl)-4-tridecylester; mixture of: 2,2,4,4 tetramethyl-21-oxo-7-oxa-3.20-diazadispiro[5.1.11.2]-heneicosane-20-propionic acid dodecylester and 2,2,4,4 tetramethyl-21-oxo-7-oxa-3.20-diazadispiro[5.1.11.2]-heneicosane-20-propionicacid tetradecylester; Poly[[6-[(1,1,3,3-tetramethylbutyl)amino]-s-triazine-2,4-diyl][2,2,6,6-tetramethyl-4-piperidinyl)-imino]hexamethylene[(2,2,6,6-tetramethyl-4-piperidinyl) iminol]}; 1,3,5-Triazine-2,4,6-triamine, N,N′″-[1,2-ethanediylbis[[[4,6-bis[butyl(1,2,2,6,6-pentamethyl-4-piperidinyl)amino]-1,3,5-triazine-2-yl]mino]-3,1-propanediyl]]-bis[N′,N″-dibutyl-N′,N″-bis(1,2,2,6,6-pentamethyl-4-piperidinyl); Poly[(6-morpholino-s-triazine-2,4-diyl)[1,2,2,6,6-penta-methyl-4-piperidyl)imino]-hexamethylene[(1,2,2,6,6 penta-methyl-4-piperidyl)iminol]1,6-Hexanediamine, N,N′-bis(1,2,2,6,6-pentamethyl-4-pipiridinyl)-, Polymers with morpholine-2,4,6-trichloro-1,3,5-triazine; Poly-methoxypopyl-3-oxy[4(1,2,2,6,6-pentamethyl)-piperidinyl]-siloxane; 1,6-Hexanediamine, N,N′-bis(2,2,6,6-tetramethyl-4-piperidinyl)-polymer with 2,4,6-trichloro-1,3,5-triazine, reaction products with N-butyl-1-butanamine and N-butyl-2,2,6,6-tetramethyl-4-piperidinamine; reaction products of N,N′-ethane-1,2-diylbis (1,3-propanediamine), cyclohexane, peroxidized 4-butylamino-2,2,6,6-tetramethylpiperidine and 2,4,6-trichloro-1,3,5-triazine; and 1,6-hexanediamine, N,N′-bis(2,2,6,6-tetramethyl-4-piperidinyl)-, polymer with 2,4,6-trichloro-1,3,5-triazine, reaction products with 3-bromo-1-propene, n-butyl-1-butanamine and N-butyl-2,2,6,6-tetramethyl-4-piperidinamine, oxidized, hydrogenated into a (U)HMWPE resin having a molecular weight distribution (Mw/Mn) of between 2 and 18, wherein Hindered Amine Light Stabilizers are the only stabilizers in the composition; and (b.) cross-linking the composition during or after molding by irradiating the composition with an irradiation dose of from 30 to 250 kGy, thereby forming an article with a cross-link density of 0.09 mol/dm