Patent GB-797054-A (GB)
Title: Heat-stable organic cadmium salts and their use in synthetic resins
IPC: C07F3/00
Filed: 1955-10-20
Abstract: The invention comprises a basic cadmium salt of an aliphatic monocarboxylic acid containing at least 6 carbon atoms or of an aromatic monocarboxylic acid, rendered resistant to yellowing upon exposure to elevated temperature by the presence therewith of a minor proportion by weight, based on the salt, of an organic compound having 2 to 12 carbon atoms and containing at least two hydroxy groups, one of which may be contained in a carboxyl group, the organic compound being a glycol, an aliphatic polyol, an aliphatic polyhydroxy ether, an amino glycol, a polyalkanol amine, an aliphatic hydroxy carboxylic acid, a polyhydroxy aromatic hydrocarbon or a polyhydroxy aromatic carboxylic acid.  The heat-stable mixture suitably contains 1-25 per cent by weight of the polyhydroxy compound and can be made by blending the materials in a ball mill or preferably by adding a benzene solution of the polyhydroxy compound to a slurry of the basic compound in a 50 : 50 benzene-acetone solution, then evaporating-off the solvents and breaking up the resulting cake.  The resistance to yellowing is believed to be due to the formation of a complex between the polyhydroxy compound and cadmium oxide formed by decomposition of the basic salt when it is exposed to heat.  The stabilized salts render vinyl halide resins heat and light stable (see Group IV (a)).  Examples describe heat stable monobasic cadmium caprylate containing 5 per cent of ethylene glycol, propylene glycol, butanediol-1 : 3, 2-methyl pentanediol-1 : 3, octanediol-4 : 5, glycerol, pentaerythritol, diethylene glycol, dipropylene glycol, glycerol-allyl ether, citric acid, glycollic acid, catechol or resorcinol and heat-stable monobasic cadmium benzoate containing 5 per cent of dipropylene glycol.  Other mono-basic cadmium salts mentioned are the laurate, caproate, undecylenate, ricinoleate, stearate, naphthoate, salicylate, chlorobenzoate, toluate and phenyl acetate.  Additional examples of polyhydroxy compounds are hexane-diol, sorbitol, 2 - ethyl - 2 - amino - propanediol - 1 : 3, triethanolamine, hydroquinone, pyrogallol, phloroglucinol, 2 - hydroxymethyl phenol, 1 : 2-dihydroxynaphthalene and 3 : 4-dihydroxy benzoic acid. Specification 760,636, [Group IV (a)], is referred to.ALSO:Vinyl halide resins are rendered heat and light stable by incorporating therein a composition consisting of a basic cadmium salt of an aliphatic monocarboxylic acid having at least 6 carbon atoms or of an aromatic monocarboxylic acid and a minor proportion by weight based on the salt of an organic compound having 2 to 12 carbon atoms and being a glycol, an aliphatic polyol, an aliphatic polyhydroxyether, an amino glycol, a polyalkanolamine, an aliphatic hydroxy carboxylic acid, a polyhydroxy aromatic hydrocarbon or a polyhydroxy aromatic carboxylic acid.  Glycols mentioned are ethylene glycol, propylene glycol, butanediol, methyl pentanediol, hexanediol, octanediol, glycerol, pentaerythritol, sorbitol, diethylene glycol, triethylene glycol, dipropylene glycol, glycerol allyl ether, 2-ethyl-2-amino-1,3-propanediol, triethanolamine, glycollic acid, citric acid, resorcinol, catechol, hydroquinone, pyrogallol, phloroglucinol, 2-hydroxymethyl phenol, 1 : 2-dihydroxy naphthalene and 3 : 4-dihydroxybenzoic acid.  Specified basic cadmium salts are monobasic cadmium laurate, caprylate, caprate, undecylenate, ricinoleate, stearate, benzoate, naphthoate, salicylate, chlorobenzoate, toluate and phenyl acetate.  The compositions may also contain a plasticizer such as dioctyl phthalate.  Specification 760,636 is referred to.