Polar pressure-sensitive adhesives
AssigneeAvery Dennison Corporation
InventorsThomas C. Epple, Carol A. Koch, Prakash Mallya, Colin C. Smith
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Abstract
A inherently tacky pressure-sensitive adhesive copolymer is formed by copolymerizing at least one alkyl acrylate in the presence of a positive amount up to 50 percent by weight of the monomers of a polar acrylate monomer which, when homopolymerized, have a glass transition temperature less than 50.degree. C.
Claims22
A high polar acrylate content pressure-sensitive adhesive copolymer formed by copolymerizing, in solution, a mixture of acrylic monomers comprising at least one alkyl acrylate containing from about 4 to about 8 carbon atoms in the alkyl group in the presence of from 15 to about 50 percent, by weight of the mixture of acrylic monomers, of a polar acrylate monomer of the formula:
- CH.sub.2 =CYCOO--R--Z
- wherein Y is selected from the group consisting of hydrogen and methyl, R is selected from the group consisting of alkyl, cycloalkyl, aromatic, alkyl ester and alkyl ether containing up to about 12 carbon atoms and Z is selected from the group consisting of COOH and CH.sub.2 OH, said monomer, when homopolymerized having a glass transition temperature of less than about 50.degree. C., said copolymer having a glass transition temperature of at least 10.degree. C. below use temperature and cross linked in the presence of a chemical crosslinking agent.
A pressure-sensitive adhesive copolymer formed by copolymerizing, in solution, a mixture of acrylic monomers comprising at least about 55 percent by weight 2-ethyl hexyl acrylate, from about 15 to about 50% by weight of the monomers of beta carboxyethyl acrylate, from 1 to about 15 percent by weight acrylic acid, said copolymer having a glass transition temperature of at least 10.degree. C. below use temperature and cross linked in the presence of a chemical cross linking agent.
Dependencies are inferred from the claim text.