GB1086678A - Stabilisation of pvc - Google Patents

Abstract

Rigid polyvinyl chloride is stabilized against light by incorporating therein (a) 0.1 to 5.0 weight per cent, based on the polymer of a monoamide R2CON(R1)2, where R1 is hydrogen C1- 18 alkyl or C1- 6 hydroxy- or cyanoalkyl, and R2 is C1- 18 alkyl, alkenyl, carboxyalkyl or carbalkoxyalkyl, di-(C1- 6 alkyl) aminoalkyl or alkanamido alkyl; or a heteropolycarbamylalkane Z[-alkylene CON(R3)2]n, where Z is imino, C1- 18 N-alkylimino, thio or phosphinylidyne, "alkylene" contains 1 to 3 carbon atoms, and R3 is hydrogen, C1- 18 alkyl or C1- 6 hydroxy- or cyanoalkyl and n is 2 or 3; and (b) 0.1 to 3.0 weight per cent of an ultra-violet light absorber selected from substituted 2-hydroxybenzophenones, 2-(2-hydroxyphenyl) benzotriazoles, phenolic esters, triazines, benzothiazoles, benzylidene malonic esters and arylaminoethylenes. Many suitable stabilizers are listed and examples describe the stabilization of rigid polyvinyl chloride containing a conventional heat stabilizer and optionally titanium dioxide and light stabilizers comprising N-(2-dodecyl) acrylamide, N,N-dimethyl oleamide, N,N-bis-(2-cyanoethyl) succinamic acid, stearamide, N,N-dimethyl stearamide, N-(n-dodecyl) linoleamide, N - decyl - 3 - dimethylaminopropionamide, N-octadecyl - 3 - dimethylaminopropionamide, N,N - bis - (2 - hydroxyethyl) lauramide, 3,31-(methylimino) bis - N - dodecyl propionamide or 3,31,311 - phosphinylidyne tris - (propionamide); and 2 - hydroxy - 4 - methoxybenzophenone, 2 - (2 - hydroxy - 5 - methylphenyl) benzotriazole or diethyl p-methoxybenzylidene malonate.