| 摘要 |
Vinyl chloride polymers are stabilized with stabilizer combinations comprising a polyhydric alcohol, an alkali metal salt of an organic carboxylic acid and a polyvalent metal salt of an organic monocarboxylic acid. The polymer may be polyvinyl chloride, chlorinated polyvinyl chloride, copolymers of vinyl chloride with vinyl acetate, styrene, maleic esters and fumaric esters, and mixture thereof with chlorinated polyethylene or copolymers of butadiene, styrene and acrylonitrile. The compositions may comprise other stabilizers, e.g. organic phosphites, polyvalent metal salts of hydrocarbon substituted phenol, epoxy compounds and resins, and alkyl phenols, long lists of suitable compounds being given. Plasticizers, e.g. dioctylphthalate, dioctyl sebacate, tricresyl phosphate and epoxidized esters; and parting agents, e.g. stearic, pentachlorostearic, lauric, palmitic and myristic acids, lubricating oils, polyvinyl stearate, polyethylene and paraffin wax; may also be present. Extensive lists of stabilizer components are given and examples describe compositions comprising polyvinyl chloride and dipentaerythritol with (1) diphenyl monoisooctyl phosphite, potassium laurate and zinc stearate or cadmium benzoate; (2) diphenyl mono-2-ethylhexyl phosphite, sodium laurate and zinc stearate or cadmium benzoate; (3) phenyl diisooctyl phosphite, sodium laurate and stannous 2-ethylhexoate; (4) diphenyl monoisooctyl phosphite and potassium laurate and cadmium benzoate or zinc naphthoate, or sodium laurate and cadmium benzoate; and (5) phenyl diisooctylphosphite and zinc stearate and sodium epoxystearate, lithium laurate, rubidium laurate or caesium laurate, or cadmium stearate and sodium epoxystearate, lithium laurate, rubidium laurate or caesium laurate. Specifications 893,288, 918,362, 918,363 and 918,364 are referred to. |
