Minnesota Mining and Manufacturing Company

Robert R Charbonneau

Jerald K Rasmussen

Steven M Heilmann

Michael L Tumey

Gaylord L Groff

Robert M Spatafore

Pressure-sensitive adhesives are prepared by the simultaneous polymerization of minor amounts of at least one alkenyl azlactone monomer and at least one arylic-functional carboxylic acid monomer, or precursors thereof, with a major amount of at least one acrylic monomer. The pressure-sensitive adhesives, after application to a substrate, will significantly increase in adhesion to the resultant bonded substrate after they are in the bonded configuration.

Azlactone-containing pressure-sensitive adhesives

Pressure-sensitive adhesive tape, the adhesive layer of which is a copolymer of alkyl acrylate such as isooctyl acrylate and an acid such as acrylic acid and which differs from the prior art in its high acid content and by including a small amount of lower-alkoxylated amino formaldehyde condensate as a latent crosslinking agent. The adhesive does not become crosslinked until it is heated. After the tape has been applied and heated to crosslink the adhesive, the resultant bonds have outstanding resistance to peel forces combined with surprisingly good resistance to shear forces, especially at elevated temperatures.

Storable, crosslinkable pressure-sensitive adhesive tape

After priming the purlins of a post frame building with a blend of rubbery block copolymer and compatible tackifier resin, double-coated foam-backed pressure-sensitive adhesive tape is applied to the primed surfaces to secure the roof panels, which pressure-sensitive adhesive comprises rubbery block copolymer and compatible tackifier resin.

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Lake Elmo, MN, United States of America

Robert R Charbonneau