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Polymeric hindered amine light stabilizers

  • US 4,804,717 A
  • Filed: 05/28/1987
  • Issued: 02/14/1989
  • Est. Priority Date: 05/28/1987
  • Status: Expired due to Term
First Claim
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1. A piperidine modified acrylate-methacrylate copolymer consisting of monomer units (I), (II), (III) and IV corresponding to the formula:

  • ##STR26## wherein R1 and R4 may be the same or different, and each is a lower alkyl radical;

    R2 and R3 may be the same or different, and each is a substituted piperidine radical;

    M is equal to the total number of monomer units in the polymer chain, and is of a magnitude sufficient to provide a polymer having a molecular weight of at least 500;

    W is equal to at least 0.5, X is equal to at least 0.1 but not greater than 0.2, Y is equal to at least 0.1, Z is equal to at least 0.05 but not greater than 0.2, and W plus X plus Y plus Z is equal to 1.

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