Resistance of polyvinyl chloride resins to discoloration during

Details Resistance of polyvinyl chloride resins to discoloration during Resistance of polyvinyl chloride resins to discoloration during

1978-12-26

1981-02-24

Anderson, Harold D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 457P, 260 458A, 260 4575K, 260 459NC, 526217, 526344, 5263442, 526345, 528492, C08L 2706

Patent

active

042527058

ABSTRACT:
The resistance of polyvinyl chloride resins to the development of yellow to orange reversible discoloration when heated in the presence of water at moderately elevated temperatures above 80.degree. C. up to about 160.degree. C. is improved by combining therewith an N,N'-diphenyl urea. Such reversible discoloration is not associated with any heat instability, and the resistance of the polyvinyl chloride resin to deterioration when heated at processing temperatures of 150.degree. C. and above is then improved by incorporation of the usual polyvinyl chloride resin heat stabilizers.

REFERENCES:
patent: 3051675 (1962-08-01), Glueck et al.

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