Coating processes – Coating remains adhesive or is intended to be made adhesive – Pressure sensitive adhesive
Patent
1990-05-31
1991-09-17
Pianalto, Bernard
Coating processes
Coating remains adhesive or is intended to be made adhesive
Pressure sensitive adhesive
B05D 510
Patent
active
050494163
ABSTRACT:
There are disclosed normally tacky, pressure-sensitive adhesive compositions comprising one or more normally tacky polymers having a T.sub.g of about 0.degree. C. or less and containing (a) at least about 40 weight percent of at least one polymerized olefinically unsaturated carboxylic acid ester monomer in the polymer backbone and (b) pendant functional groups attached to the backbone and having the formula: ##STR1## wherein R.sub.1 is (i) a covalent bond which directly connects the carbonyl carbon atom of the --CHO group to a carbon atom in the backbone of the polymer or (ii) a divalent organic radical comprising a carbon atom which directly adjoins the carbonyl carbon atom of the --CHO group, the polymers also being normally tacky when cured. Such polymers have improved cohesive strength (shear holding value) with little or no detriment to adhesive tack or adhesion (peel resistance), and these improvements are realized without the necessity of incorporating crosslinking monomers such as N-methylolamides or other crosslinking agents. Pressure-sensitive adhesive, water-based emulsions containing such polymers and pressure-sensitive adhesive articles comprising a substrate having at least a portion of one surface thereof coated with the adhesive compositions are also disclosed.
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Kondzella Michael A.
Pianalto Bernard
Union Oil Company of California
Wirzbicki Gregory F.
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