Thermooxidative stabilization of polyolefins with an oxo-piperaz

Details Thermooxidative stabilization of polyolefins with an oxo-piperaz Thermooxidative stabilization of polyolefins with an oxo-piperaz

1992-05-26

1994-01-11

Morgan, Kriellions

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

524120, 524147, 524149, 524151, C08K 53492, C08K 552

Patent

active

052782093

ABSTRACT:
Only two symmetrical stabilizers in a polyolefin or copolymer thereof, provide thermooxidative ("TO") or antioxidative ("AO") stability. One is an arylphosphite or arylfluorophosphite; the other is a monomolecular tri-substituted triazine in which each of three chlorine atoms on a trihalo-s-triazine is substituted with a piperazinone in which the N atom in the 4-position is alkylated. Only a trace amount of phosphite, at least 0.01 phr but less than 0.1 phr, is used so that the ratio of the piperazinone-substituted stabilizer to ester is greater than 1; additional phosphite has no noticeable effect. The trace amount of phosphite has a surprising booster effect, giving the stabilized composition excellent TO stability. Articles thermoformed from the stabilized polyolefin or copolymer thereof may be used under the hood or the dash of a vehicle, and, in containers for packaging goods, all of which articles are subject to TO degradation even if they are not subject to ultraviolet light degradation.

REFERENCES:
patent: 4261880 (1981-04-01), Fujii et al.
patent: 4305866 (1981-12-01), York et al.
patent: 4480092 (1984-10-01), Lai et al.

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