Method for the preparation of light-resistant and weather-proof polyolefin foams
AssigneeDynamit Nobel Aktiengesellschaft
InventorsWerner Kuhnel, Paul Spielau
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Abstract
A method for producing foam polyolefin products which are light-stable and weather-resistant are obtained by the combined use of the following stabilizers: (a) phenolic antioxidants, (b) substituted benzophenones and/or substituted benzotriazoles, and (c) sterically hindered amines.
Claims12
In a method for the preparation of foams of a polyolefin by crosslinking by addition of an organic peroxide or by means of radiation crosslinking and foaming by a chemical blowing agent by the action of heat under normal pressure conditions, the improvement comprising adding, in addition to any other adjuvants and aids, a combination of
- (a) phenolic antioxidants,
- (b) substituted benzophenones and/or substituted benzotriazoles and
- (c) sterically hindered amines to the polyolefin to obtain a light-resistant and weather-proof foam of the polyolefin.
Dependencies are inferred from the claim text.