Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1988-01-19
1989-07-11
Schofer, Joseph L.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428522, 1562757, 1562755, 156327, 427 541, 4272084, B05D 308, B05D 302, B05D 510
Patent
active
048471372
ABSTRACT:
A pressure-sensitive adhesive is provided which is a copolymer of an acrylate monomer which contributes to the visco-elastic properties of the copolymer and a copolymerizable mono-ethylenically unsaturated aromatic ketone comonomer free of ortho-aromatic hydroxyl groups by means of which the copolymer can be crosslinked upon exposure to ultraviolet radiation such that the amount of crosslinking comonomer and the degree of polymerization of the copolymer are controlled to obtain a creep compliance value of at least about 1.2.times.10.sup.-5 cm.sup.2 /dyne, the adhesive exhibits an enhanced level of initial adhesion when applied to skin but resists objectionable adhesion build-up over time. A preferred crosslinking ethylenically unsaturated hydroxyl-free aromatic ketone comonomer is p-acryloxybenzophenone.
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Kellen James N.
Taylor Charles W.
Hulse Dale E.
Kirn Walter N.
Kulkosky Peter F.
Minnesota Mining and Manufacturing Company
Schofer Joseph L.
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