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US 6,293,037 B1Granted
Pressure-sensitive adhesives and self-adhesive postage stamps made therewith
AssigneeAvery Dennison Corporation
InventorsLon T. Spada, Carol A. Koch, Kathleen M. Alpaugh
Life of this patent
Estimating the term…
Abstract
Acrylic, self-adhesive postage stamps are provided and include a flexible facestock bearing an acrylic pressure-sensitive adhesive (PSA), protected by a release liner. The acrylic PSA is a tackified or inherently tacky polymer formed from a plurality of monomers comprising, based on the total weight of monomeric composition, essentially of (i) 9 to 40% isobornyl acrylate and (ii) 50 to 91% of one or more alkyl acrylates.
Claims16
A self-adhesive postage stamp, comprising:
- (a) a flexible face stock having opposed first and second faces, at least one of which is imprinted with postage indicia;
- and
- (b) a pressure-sensitive adhesive applied to one face of the flexible face stock, said pressure-sensitive adhesive comprising an acrylic copolymer made from a mixture of monomers, comprising, based on the total weight of monomers,
- (i) from about 9 to about 40% of an ethylenically unsaturated monomer having an isobornyl group, and
- (ii) from about 50 to about 91% of at least one alkyl acrylate having an alkyl group with about 4 to about 8 carbon atoms.
2 more elements
A self-adhesive postage stamp, comprising:
- (a) a flexible face stock having opposed first and second faces, at least one of which is imprinted with postage indicia;
- and
- (b) a pressure-sensitive adhesive applied to one face of the flexible face stock, said pressure-sensitive adhesive comprising an acrylic copolymer made from a mixture of monomers comprising, based on the total weight of monomers,
- (i) from about 20 to about 30% isobornyl acrylate,
- (ii) about 50 to about 80% of one or more alkyl acrylates having alkyl groups with about 4 to about 8 atoms,
- (iii) about 1 to about 20% methyl methacrylate,
- (iv) about 1 to about 6% acrylic acid, and
- (v) about 0.5 to about 6% hydroxyethyl acrylate.
5 more elements
Dependencies are inferred from the claim text.