Pressure-sensitive adhesive

Details Pressure-sensitive adhesive Pressure-sensitive adhesive

1982-04-12

1983-01-25

Robinson, Ellis P.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Adhesive outermost layer

428343, 428411, 428483, 428520, 428522, C09J 702, C08L 3500, C08L 3906

Patent

active

043703801

ABSTRACT:
An optically clear blend of (1) a water-soluble polymer of a vinyl lactam having the structure ##STR1## in which X represents an alkylene bridge having three to five carbon atoms or a copolymer thereof with 1 to 80 mole percent of a copolymerizable monomer containing a polymerizable ethylenic unsaturation; and (2) a tacky water-insoluble copolymer of (A) an ester or a mixture of esters having the structure ##STR2## in which R' represents hydrogen or methyl and R.sub.1 represents alkyl having from 1 to 14 carbon atoms and (B) from 1 to 12% by weight, based on the copolymer, of an ethylenic monomer containing an acid group, the vinyl lactam polymer or copolymer being present in an amount from 1 to 30% by weight of the blend and having a glass transition temperature from 20.degree. to 150.degree. C., and the tacky copolymer having a glass transition temperature below 0.degree. C. and being present in an amount from 70 to 99% by weight of the blend and having a viscosity less than 50,000 cp at 350.degree. F. The blend is useful as a pressure-sensitive adhesive composition.

REFERENCES:
patent: 3027347 (1962-03-01), Fikentscher et al.
patent: 3928262 (1975-12-01), Ono et al.
Boyer-Kawenoki, Compt. Rend., Ser. C, vol. 263, p. 278, (Chem. Abs., vol. 65, 20283d), 1966.

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