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US 9,469,794 B2Granted
Cationic UV-crosslinkable acrylic polymers for pressure sensitive adhesives
AssigneeHenkel IP & Holding GmbH
InventorsYuxia Liu, Peter Palasz, Charles W. Paul, Paul B. Foreman
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Abstract
An ultraviolet (UV) crosslinkable acrylic pressure sensitive adhesive comprises an acrylic copolymer and a cationic photoinitiator. The acrylic copolymer comprises pendant reactive functional groups. The pressure sensitive adhesive formed from the acrylic copolymer with the pendant reactive functional groups result in high green strength and/or high temperature holding strength of the adhesive.
Claims4
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 having the formula:
- or mixtures thereof, and
- wherein 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.
5 more elements
Dependencies are inferred from the claim text.