Storable, crosslinkable pressure-sensitive adhesive tape
AssigneeMinnesota Mining and Manufacturing Company
InventorGaylord L. Groff
Life of this patent
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Abstract
Pressure-sensitive adhesive tape, the adhesive layer of which is a copolymer of alkyl acrylate such as isooctyl acrylate and acid such as acrylic acid which differs from the prior art 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, it exhibits excellent resistance to common organic solvents and also exceptional resistance to shear failure, especially at elevated temperatures. The adhesive has excellent electrical-insulating properties.
Claims9
A tape comprising a backing and a pressure-sensitive ahdesive layer comprising a copolymer of
- (a) more than 90 parts of acrylic acid ester of nontertiary alcohol, the molecules of which have from 1-14 carbon atoms, the average being at most 12 carbon atoms, and
- (b) at least one copolymerizable monoethylenic monomer selected from the group consisting of acrylic acid, methacrylic acid and itaconic acid,
- wherein the improvement comprises:
- the adhesive layer includes in an amount within the range of about 0.1 to 10 percent by weight of the copolymer, a lower-alkoxylated amino formaldehyde condensate having C.sub.1-4 alkyl groups, said copolymer being substantially uncrosslinked until being heated.
Dependencies are inferred from the claim text.