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US 4,290,942 AGranted
Heat-stabilized chlorine-containing thermoplastic
AssigneeCiba-Geigy Corporation
InventorsRainer Schneider, Gerd Abeler
Life of this patent
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Abstract
Chlorine-containing thermoplastics, especially polyvinyl chloride, can be stabilized against thermal degradation by incorporating therein synergistic mixtures consisting of (a) a mercaptan of the formula R(CH.sub.2 SH).sub.2, wherein n is 2 to 4 and R represents a n-valent aromatic radical, and (b) an epoxidized plasticizer.
Claims1
A method for stabilizing chlorine-containing thermoplastics, which comprises incorporating into said thermoplastic a stabilizing amount of an epoxidised plasticizer, a phosphite, and a mercaptan of the formula (I)
- R--(CH.sub.2 --SH).sub.n (I)
- wherein n is an integer from 2 to 4 and R represents a divalent to quadrivalent benzene or naphthalene, benzene or naphthalene substituted with alkyl of 1 to 18 carbon atoms, alkoxy of 1 to 18 carbon atoms, or alkoxycarbonyl of 2 to 18 carbon atoms, or a divalent to quadrivalent group of the formula II
- --Ar--X--Ar-- (II)
- wherein Ar represents an phenyl group, unsubstituted or substituted with alkyl of 1 to 18 carbon atoms, alkoxy of 1 to 18 carbon atoms, or alkoxycarbonyl of 12 to 18 carbon atoms, which carries the free valencies, and X represents a direct bond, alkylene, alkylidene or cycloaklylidene, O, S, SO or SO.sub.2.
1 more element
Dependencies are inferred from the claim text.