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US 5,037,870 AGranted
Stabilization of organic polymers against degradation by light
AssigneeCiba-Geigy Corporation
InventorFrancois Gugumus
Life of this patent
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Abstract
The invention relates to the stabilization of organic polymers against degradation by light by the addition of (a) a light stabilizer of the formula ##STR1## in which R is hydrogen or methyl and A is an alkylene radical, and (b) an oxide, hydroxide, carboxylate, enolate or phenate of magnesium or zinc.
Claims8
An organic polymer containing, as a stabilizer against degradation by light,
- (a) a polyalkylpiperidine light stabilizer of the formula I ##STR5## in which R is hydrogen or methyl, A is an unbranched or branched alkylene radical having 2 to 10 C atoms and n has a value of 2-50 and
- (b) a magnesium or zinc compound selected from the group consisting of oxides, hydroxides, carboxylates, enolates and phenates, the component (b) not being an oxide or hydroxide in the case of polyethylene.
A process for stabilizing organic polymers against degradation by light by adding a mixture of stabilizers, characterized in that a mixture is added of
- (a) a polyalkylpiperidine light stabilizer of the formula I ##STR7## in which R is hydrogen or methyl, A is an unbranched or branched alkylene radical having 2 to 10 C atoms and n has a value from 2 to 50, and
- (b) a magnesium or zinc compound selected from the group consisting of oxides, hydroxides, carboxylates, enolates and phenates, the component (b) not being an oxide or hydroxide in the case of polyethylene.
Dependencies are inferred from the claim text.