Compositions of antioxidants of reduced volatility

Details Compositions of antioxidants of reduced volatility Compositions of antioxidants of reduced volatility

1976-08-23

1979-01-23

Engle, Samuel W.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252406, 260 4595R, 260 4595C, C09K 1508, C09K 1510, C08G 7500

Patent

active

041360559

ABSTRACT:
For incorporation in normally oxidizable polymers, polymeric antioxidants characterized by repeating hindered bisphenolic units, the average number of said units per polymeric chain in said composition being from about 2 to 10, preferably about 2 to 7, most preferably about 2 to 4. The antioxidants are prepared by oxidative coupling of appropriate bisphenols, as by reaction with a ferricyanide coupling agent. Polymer-antioxidant combinations formed according to the invention have excellent high temperature oxidative stability, high resistance to polymer damage by massive doses of ionizing radiation and the antioxidant does not release significant amounts of condensable species when subjected simultaneously to conditions of high vacuum and elevated temperatures.

REFERENCES:
patent: 3986981 (1976-10-01), Lyons
Tarbox, "Heat Aging of Chemically Cross-Linked Polyethylene", Wire and Wire Products, 36(4), Apr. 1961, p. 465.

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