Patents Represented by Attorney Vincent J. Cavalleri

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  • Stabilization of light-sensitive polymers
    Patent number: 4177186
    Abstract: 4-Siloxy-derivatives of sterically hindered piperidines are good light-stabilizers for organic polymers, especially for polyolefins. The stabilizers are added in an amount of from 0.01 to 5% by weight, preferably 0.02 to 1% by weight based on the polymer. The new compounds are obtainable by O-silylation of the corresponding 4-hydroxypiperidines.
    Type: Grant
    Filed: November 21, 1977
    Date of Patent: December 4, 1979
    Assignee: Ciba-Geigy Corporation
    Inventors: Jean Rody, Gerd Greber, Helmut Muller