Improvements in or relating to liquid phosphite ester stabilizers for vinyl halide resins

摘要

The invention comprises a mixture of tertiary phosphites that is the product of the reaction at 100 DEG to 180 DEG C. of: (i) pentaerythritol, sorbitol, mannitol, trimethylolethane or trimethylolpropane or a mixture of two or more of these; (ii) a secondary phosphite; and (iii) a tertiary phosphite, in an amount of 0.5 to 5 moles of secondary phosphite and 2 to 15 moles of tertiary phosphite per mole of polyhydric alcohol. The reactants may be reacted simultaneously or in stages. The secondary phosphite may be the product obtained by treating a tertiary phosphite with 0.8 to 1.5 moles of water.ALSO:A stabilizer for vinyl halide or vinylidene halide resins comprises: (a) a mixture of tertiary organic phosphites that is the product of the reaction at 100 DEG to 180 DEG C. of: (i) pentaerythritol, sorbitol, mannitol, trimethylolethane or trimethylolpropane or a mixture of two or more of these; (ii) a secondary organic phosphite; and (iii) a tertiary organic phosphite, in the proportions of 0.5 to 5 moles of (ii) and 2 to 15 moles of (iii) per mole of (i); (b) monocarboxylic acid salts of at least two metals selected from Ba, Cd, Zn, Pb and Sn; and (c) a phenolic compound. The secondary phosphite may be the product obtained by reacting a tertiary phosphite with 0.8 to 1.5 moles of water. The resin stabilized may be polyvinyl chloride, polyvinyl bromide, polyvinylidene chloride or a copolymer of a vinyl halide with a vinyl carboxylate, vinylidene chloride, styrene, methyl methacrylate, dialkyl fumarate or dialkyl maleate. Mixtures of polyvinylchloride and minor proportions of chlorinated polyethylene, polyacrylate esters or acrylonitrile/butadiene/styrene copolymers may be used. An ester or phosphate-plasticizer may be present.