Release coating composition
AssigneePermacel
InventorWinifred C. Dabroski
Life of this patent
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Abstract
An aqueous release coating composition comprising a perfluorinated ester polymer and a film-forming polymer is described.
Claims7
A method for the production of pressure sensitive adhesive paper tape comprising the steps of:
- (a) mixing in aqueous solution a water-based film-forming polymer and a perfluorinated ester polymer, thereby forming a water-based backsize release coating composition, said composition comprising an aqueous mixture of
- (i) a water-based film-forming polymer and
- (ii) a perfluorinated ester polymer containing from about 30 to about 50 percent fluorine, said perfluorinated ester polymer being present in an amount of from about 0.5 to about 3.0 percent, dry weight of perfluorinated ester polymer per dry weight of water-based film-forming polymer;
- (b) impregnating a paper tape backing with a solvent-based or latex-based saturant to improve internal properties of the backing;
- (c) coating the backing on the backside surface with the release coating composition;
- (d) drying and fluxing the coated backing at a temperature of from about 250.degree. to 300.degree. F.;
- and
- (e) coating the backing on the side surface opposite to the backside with a pressure sensitive adhesive.
A pressure-sensitive adhesive tape comprising a paper backing having two surfaces, said paper being impregnated with an internal property improving latex or solvent-based saturant and having a coating on the backside surface of a release coating composition and a coating on the opposite surface of a pressure-sensitive adhesive, said release coating composition comprising an aqueous mixture of (a) a water-based film-forming polymer and (b) a perfluorinated ester polymer containing from about 30 to about 50 percent fluorine, said perfluorinated ester polymer being present in an amount of from about 0.5 to about 3.0 percent, dry weight of perfluorinated ester polymer per dry weight of water-based film-forming polymer, said coating composition being coated and then dried and fluxed at a temperature of about 250.degree. to about 300.degree. F.
Dependencies are inferred from the claim text.