Tackified acrylic pressure-sensitive adhesive and composite arti

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428214, 4283173, 4283175, 4283177, 428355, 524272, 524314, B32B 702, B32B 710, C08L 5106

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047269820

ABSTRACT:
A pressure-sensitive adhesive that has high cohesive strength and adheres permanently to high-solids automotive paint systems preferably comprises a mixture of (1) a crosslinked acrylic copolymer of acrylic acid ester and N-vinyl-2-pyrrolidone, and (2) certain tackifier resins. Useful tackifier resins are poly(isobornylmethacrylate), pentaerythritol ester of rosin, and mixed-aliphatic/aromatic polymeric tackifier resins such as a t-butylated styrene. The tackifier resin preferably has a T.sub.g of at least 30.degree. C., M.sub.n from 300 to 3000, and a solubility parameter from 8 to 9. The novel pressure-sensitive adhesive is particularly useful as a dense surface layer of a composite tape having a foamlike core.

REFERENCES:
patent: Re24906 (1960-12-01), Ulrich
patent: 3681190 (1972-08-01), Dahlquist
patent: 4223067 (1980-09-01), Levens
patent: 4243500 (1981-01-01), Glennon
patent: 4364972 (1982-12-01), Moon
patent: 4456741 (1984-06-01), Ames
patent: 4500663 (1985-02-01), Hori et al.
patent: 4645711 (1987-02-01), Winslow et al.
patent: 4656213 (1987-04-01), Schlademan
"American Paint and Coatings Journal", Mar. 18, 1985, pp. 54-58.

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