Heat-and light-stabilized moulding compositions containing vinyl chloride homopolymers and copolymers

摘要

Homo and copolymers of vinyl chloride and compositions containing these polymers are stabilized against light and heat by the addition of 0.05 to 5% by weight of a compound obtained by reacting RSn Hal3, where R is a monovalent alkyl radical containing not more than 20 carbon atoms and Hal is chlorine, bromine or iodine with an equivalent amount of a mixture of an alkali metal sulphide with either an aliphatic alkali metal mercaptide or with an alkali metal salt of a mono or polycarboxylic acid. In the examples, montan wax is also added.ALSO:A stabilizer for homo- or co-polymers of vinyl chloride is obtained by reacting RSnX3 where X =chlorine, bromine or iodine and R is a monovalent organic radical with not more than 20 carbon atoms with an equivalent amount of a mixture of an alkali metal sulphide with an aliphatic alkali metal mercaptide or with an alkali metal salt of a mono- or poly-carboxylic acid. The reaction is carried out in aqueous solution or in the presence of an organic solvent at a temperature between 20 DEG and 100 DEG C. The tin compound contains an aliphatic, cycloaliphatic, araliphatic or aromatic radical and is preferably a chloride. The other compounds are preferably sodium salts, the mercaptide having less than 20 carbon atoms and the carboxylic acid having at least one carboxylic acid group attached to a saturated hydrocarbon radical, or to a hydrocarbon radical containing at least one carbon-carbon double bond and not more than 20 carbon atoms. Many examples of suitable compounds are given.