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

• Current Assignee: Ferro Corporation (Vibrantz Technologies, Inc.)
• Original Assignee: Ferro Corporation (Vibrantz Technologies, Inc.)
• Inventors: Ramey, Chester E., Thompson, Ronald E., Rostek, Charles J. Jr.
• Primary Examiner(s): SECCURO JR, CARMAN J
• Application Number:
  US07/055,180
• Time in Patent Office: 628 Days
• Field of Search: 525/329.9, 525/375
• US Class Current: 525/375
• CPC Class Codes: C08F 220/12 of monohydric alcohols or phenols
• CPC Class Codes: C08F 220/14 Methyl esters , e.g. methyl (meth)acrylate
• CPC Class Codes: C08F 220/1802 C2-(meth)acrylate, e.g. ethyl (meth)acrylate
• CPC Class Codes: C08F 220/34 Esters containing nitrogen , e.g. N,N-dimethylaminoethyl (meth)acrylate
• CPC Class Codes: C08K 5/3435 Piperidines

Abstract

The present invention relates to novel compounds corresponding to the formula: ##STR1## 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.

These novel compounds are useful as stabilizers for a wide variety of organic materials and are prepared by transesterification of a suitable acrylate-methacrylate copolymer.

Claims

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.

2. The copolymer of claim 1 wherein R₂ and R₃ are each a 2,2,6,6-tetraalkylpiperidine radical.

3. The copolymer according to claim 2 wherein R₁ and R₄ may be the same or different and each is a member selected from the group consisting of methyl radicals and ethyl radicals.

4. The copolymer according to claim 2 wherein R₁ is a methyl radical and R₄ is an ethyl radical.

5. The copolymer according to claim 3 wherein R₂ and R₃ are each 2,2,6,6-tetramethylpiperidine radicals.