(Hydroxyphenyl) phosphine stabilized compositions
AssigneeCiba-Geigy Corporation
InventorsStephen D. Pastor, John D. Spivack, Edward T. Hessell
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Abstract
(Hydroxyphenyl)phosphine derivatives of the formula ##STR1## are effective in stabilizing organic materials against oxidative, thermal and actinic degradation, said derivatives being particularly effective as process stabilizers in organic materials containing phenolic antioxidants.
Claims28
A composition of matter comprising a polymer, plastic or lubricating oil subject to oxidative, thermal or actinic degradation stabilized with an effective stabilizing amount of a compound of the formula ##STR4## wherein n is an integer from 1-3;
- R.sub.1, R.sub.2 and X are independently hydrogen, C.sub.1 -C.sub.18 alkyl, C.sub.5 -C.sub.12 cycloalkyl, phenyl, phenyl substituted by alkyl of 1 to 18 carbon atoms, C.sub.7 -C.sub.9 aralkyl or said aralkyl substituted by alkyl of 1 to 18 carbon atoms;
- and
- R.sub.3 is hydrogen or --Si(R.sub.4)(R.sub.5)(R.sub.6) with R.sub.4, R.sub.5 and R.sub.6 being independently C.sub.1 -C.sub.4 alkyl or phenyl.
A compound of the formula ##STR5## wherein R.sub.1, R.sub.2 and X are independently hydrogen, C.sub.1 -C.sub.18 alkyl, C.sub.5 -C.sub.12 cycloalkyl, phenyl, phenyl substituted by alkyl of 1 to 18 carbon atoms, C.sub.7 -C.sub.9 aralkyl or said aralkyl substituted by alkyl of 1 to 18 carbon atoms;
- n is 1-3;
- when n=1, R.sub.3 is --Si(R.sub.4)(R.sub.5)(R.sub.6) with R.sub.4, R.sub.5 and R.sub.6 being independently C.sub.1 -C.sub.4 alkyl or phenyl;
- and
- when n=2 or 3, R.sub.3 is hydrogen or --Si(R.sub.4)(R.sub.5)(R.sub.6).
Dependencies are inferred from the claim text.