Water resistant, removable acrylic emulsion pressure sensitive adhesive
First Claim
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1. A water-resistant removable acrylic emulsion pressure-sensitive adhesive polymer comprising:
- a. from about 85% to about 97% by weight alkyl acrylate monomers having from about 4 to about 8 carbon atoms in the alkyl chain;
b. a positive amount up to about 3% by weight of polar monomers selected from the group consisting of methacrylic acid, acrylic acid, itaconic acid, maleic acid, acrylamide, methacrylamide, 2-hydroxy ethyl acrylate and mixtures thereof; and
crosslinked withc. a positive amount up to about 2% by weight of an external metal salt cross-linking agent, said pressure-sensitive polymer being formed by emulsion polymerization in the presence of up to about 2% by weight surfactant.
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Abstract
A water-resistant, removable pressure sensitive adhesive for use with transparent film facestocks comprises an acrylic-based emulsion polymer composition comprising 85 to 97% by weight alkyl acrylate monomers, up to 3% by weight polar monomers, up to 1% by weight internal crosslinking agent and up to 2% by weight external crosslinking agent.
28 Citations
17 Claims
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1. A water-resistant removable acrylic emulsion pressure-sensitive adhesive polymer comprising:
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a. from about 85% to about 97% by weight alkyl acrylate monomers having from about 4 to about 8 carbon atoms in the alkyl chain; b. a positive amount up to about 3% by weight of polar monomers selected from the group consisting of methacrylic acid, acrylic acid, itaconic acid, maleic acid, acrylamide, methacrylamide, 2-hydroxy ethyl acrylate and mixtures thereof; and
crosslinked withc. a positive amount up to about 2% by weight of an external metal salt cross-linking agent, said pressure-sensitive polymer being formed by emulsion polymerization in the presence of up to about 2% by weight surfactant. - View Dependent Claims (2, 3, 4, 5, 8, 9, 10, 14, 15)
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6. A water-resistant, removable pressure-sensitive adhesive construction comprising:
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a film facestock; a water-resistant, removable pressure-sensitive adhesive applied to the bottom surface of the film facestock, said pressure-sensitive adhesive comprising; from about 85% to about 97% by weight alkyl acrylate monomers;
having from about 4 to about 8 carbon atoms in the alkyl chain;a positive amount of up to about 3% by weight of polar monomers selected from the group consisting of methacrylic acid, acrylic acid, itaconic acid, maleic acid, acrylamide, methacrylamide, 2-hydroxy ethyl acrylate and mixtures thereof; and
crosslinked witha positive amount of up to about 2% by weight of an external metal salt cross-linking agent selected from the group consisting of zirconium ammonium carbonate, zinc ammonium carbonate, aluminum acetate and zinc acetate, said water-resistant removable pressure-sensitive adhesive being formed by emulsion polymerization in the presence of up to about 2% by weight surfactant based on the weight of the monomers said crosslinked pressure-sensitive adhesive having a peel adhesion to stainless steel of about 50 to about 300 N/m. - View Dependent Claims (7, 11, 12, 13, 16, 17)
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Specification