Process for the production of adhesive-repellent coatings
AssigneeBeiersdorf AG
InventorsPeter Gleichechagen, Gunter Klaass
Life of this patent
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Abstract
A process for the production of adhesive-repellent coatings, particularly for the production of surface coatings on the backs of pressure sensitive tapes, comprising the radical emulsion polymerization products, in an aqueous alkaline medium, of a monomer mixture of maleic monoamides or maleic monoesters, styrene or its derivatives or a mixture of styrene or its derivatives with acrylic alkyl esters, plus optional cross linking monomers and polar monomers.
Claims31
A process for the production of adhesive repellent coatings comprising producing a copolymer by radical emulsion-polymerization under alkaline conditions in an aqueous medium of monomers comprising
- (a) 5% to 85% by weight, based on total weight of said monomers, of at least one compound of maleic monoamide or maleic monoester, said compound having a hydrocarbon radicals of 12 to 32 carbon atoms, wherein up to about 50% of said compounds may be replaced by fumaric esters,
- (b) 15% to 95% by weight, based on total weight of said monomers, of a substance taken from the class consisting of styrene, styrene derivatives, and a mixture of said styrene or said styrene derivatives with an acrylic alkyl ester, said substance being present in an amount at least equimolar with (a),
- (c) 0 to 20% by weight, based on total weight of said monomers, of at least one cross linking agent having a plurality of polymerizable carbon double bonds, or having reactive functional groups,
- (d) 0 to 20% by weight, based on total weight of said monomers, of polar materials having at least one carboxyl group, whereby an aqueous emulsion having a solids content is produced, applying said emulsion to a substrate to form a coating, and drying said coating at a temperature of at least 100.degree. C.
Dependencies are inferred from the claim text.