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CATIONIC UV-CROSSLINKABLE ACRYLIC POLYMERS FOR PRESSURE SENSITIVE ADHESIVES

  • US 20140303274A1
  • Filed: 06/19/2014
  • Published: 10/09/2014
  • Est. Priority Date: 03/09/2010
  • Status: Active Grant
First Claim
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1. An ultra-violet curable pressure sensitive adhesive comprising an acrylic polymer and a cationic photoinitiator, wherein said acrylic polymer comprises:

  • (i) an acrylic monomer consisting of an acrylic or methacrylic acid derivative of the formula CH2

    CH(R1)(COOR2), wherein R1 is H or CH3 and R2 is C1-20 alkyl chain;

    (ii) a monomer, wherein the monomer comprises a pendant reactive functional groups selected from(1) mono-substituted oxirane, and(2) cycloaliphatic epoxide, oxetane, benzophenone or mixtures thereof, andwherein said monomer contains from about 0.001 to about 0.015 equivalent per 100 g of said acrylic polymer; and

    wherein said acrylic polymer (a) is essentially free of multi-(meth)acrylate (b) has a Tg value less than 0°

    C., and (c) has a weight average molecular weight from about 50,000 to about 1,000,000 g/mol.

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