GB1073505A - Improvements relating to carbonamides - Google Patents

Abstract

A fibre is produced from a linear polyamide containing 0.05-5% of either <FORM:1073505/C3/1> where R1 = C1- 8 alkyl and R = C4- 8 tert. alkyl or <FORM:1073505/C3/2> wherein R = C1- 8 alkyl and R1 = C4- 8 tert. alkyl as an antioxidant. Compounds specified include those in which R = tert.-butyl and R1 is methyl. Polyamides specified are polycaprolactam, polyundecanolactam, poly(hexamethylene adipamide), poly(hexamethylene sebacamide), and bis-(4-amino cyclohexyl) methane polyamides with dodecane dicarboxylic acid. The polyamide may also contain 2-30% of a polyoxyethylene of at least 600 M.W., which may have methoxy, ethoxy, phenoxy, nonylphenoxy or 2,6-ditertiary butylphenoxy end-groups. 0.1-5% of a U.V. absorbant may also be present. The absorbants may be either an N-[o -(2,1,3-benzotriazol-2-yl)phenyl]-amide, e.g. an amide of pivalic, 2,2,5,5-tetramethyl adipic or 2,3,5,6-tetramethyl terephthalic acid or a 2-(o-hydroxyphenyl)-2,1,3-benzotriazole. The antioxidant may be added to the polyamide monomers before polymerization or to the polymer melt or to flakes of the polymer. The polyoxyethylene and U.V. absorbers may be added at the same time or separately. Other additives may be delusterants, pigments and dyes many dyes being specified, including 1 - amino - 4 - hydroxy - 2 -(2-hydroxyethoxy) anthraquinone. The polyamide composition may be spun into filaments and the polyoxyethylene then partially removed by scouring with water to produce a cellular product.ALSO:The heat and light fastness of dyed polyamide fibres may be improved by adding to the polyamide before spinning a compound of formula: <FORM:1073505/D1-D2/1> where R is C1-8 alkyl and R1 is C4-8 tert.alkyl or: <FORM:1073505/D1-D2/2> wherein R is C4-8 tert.-alkyl and R1 is C1-8 alkyl as antioxidant. The polyamide may also contain 2 - 30% of a polyethylene oxide and 0.1 - 5% of a 2[o-(acylamino) phenyl] 2H-benztriazole or 2(o-hydroxy phenyl) 2H-benztriazole. In Examples polyamides specified are nylon 66 and a polyamide of bis (4-amino-methyl) cyclohexane and dodecadioc acid. Antioxidants specified include 2, 3, 5, 6-tetramethyl-1, 4-di (3, 5- di-tert-butyl-4-hydroxy-benzyl) benzene and 1, 3, 5-trimethyl-2, 4, 6-tri (3, 5- di-tert-butyl-4-hydroxybenzyl) benzene. Polyethylene oxides specified include polyethylene oxide and polyethylene oxide 2, 6-di-tert-butyl phenyl ether and benztriazoles specified are N, N1 bis[o-(2H benztriazol-2-yl) phenyl]-2, 2, 5, 5-tetramethyl adipamide. N, N1bis[o-(2H benztriazol-2-yl)phenyl] 2, 3, 5, 6-tetramethyl terephthalamide and N-o-hydroxyphenyl-2H-benztriazole. Fibres composed of these materials may be dyed in aqueous dispersed dyebath containing a sodium fatty alcohol sulphate, Na3 PO4 and a surface active agent or in an aqueous premetallized dye-bath containing a sodium fatty alcohol sulphate, an ethylene oxide-propylene oxide adduct, NH4OH and (NH4)2SO4. Dyes specified are mixtures of Disperse yellow 3 1-amino-4-hydroxy-2 (2-hydroxyethoxy) anthraquinone, Disperse blue 7, Disperse blue 3, Acid green 25, Acid orange 64 and Acid red 182. In Example IX the dyed fibres are also rendered lightfast by after treatment with CuSO4-SH2O.