Laminating and coating adhesive, its manufacture and use
AssigneeWacker Chemie AG
InventorsEkkehard Merz, Robert Singer
Life of this patent
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Abstract
A laminating and coating adhesive based on an aqueous dispersion of (1) a copolymer of a vinyl ester, and/or an acrylic acid ester, and/or a further monomer and an ethylenically-unsaturated functional group-containing monomer having from 3 to 18 carbon atoms and hydroxy and carbonyl groups as functional groups, such as a monocarboxylic acid or dicarboxylic acid and/or N-methylol-(meth)-acrylamide, (2) an epoxy compound, and (3) an amine hardener. The adhesive gives a laminate bond with especially high resistance to peeling even in the case of thermal stress and/or in the presence of water.
Claims14
A laminating and coating adhesive in aqueous dispersion form comprising:
- (1) an aqueous dispersion of a copolymer of monomer units selected from the group consisting of:
- (a) a vinyl ester of an alkanoic acid having from 1 to 18 carbon atoms,
- (b) an acrylic acid ester of an alkanol having from 1 to 18 carbon atoms, and
- (c) mixtures thereof, with
- (d) from 0.1% to 10% by weight, based on the total monomer content of an ethylenically-unsaturated functional group-containing monomer having hydroxyl and carbonyl groups as functional groups selected from the group consisting of alkenoic acids having from 3 to 8 carbon atoms, alkenedioic acids having from 4 to 8 carbon atoms, N-methylolamides of said alkenoic acids and N-methylolamides and di-N-methylolamides of said alkenedioic acids, and
- (e) from 0 to 55% of other monomers copolymerizable with components (a), (b), (c) and (d),
- (2) from 0.05% to 20% by weight, based on the copolymer weight, of an expoxy compound having at least one epoxy group per molecule and having a mean epoxy equivalent weight of from 80 to 1,000, said epoxy compound being added after completion of copolymerization, and
- (3) from 0.05% to 20% by weight, based on the copolymer weight, of a polyamine hardener, said polyamine hardener being added after completion of copolymerization,
- said laminating and coating adhesive being capable of laminating at temperatures of between 60.degree. and 100.degree. C.
In the process for coating comprising applying an aqueous adhesive dispersion to a solid substrate, drying and recovering a solid substrate coated with an adhesive coating, the improvement consisting essentially of employing a laminating and coating adhesive in aqueous dispersion form comprising:
- (1) an aqueous dispersion of a copolymer of monomer units selected from the group consisting of:
- (a) a vinyl ester of an alkanoic acid having from 1 to 18 carbon atoms,
- (b) an acylic acid ester of an alkanol having from 1 to 18 carbon atoms, and
- (c) mixtures thereof, with
- (d) from 0.1% to 10% by weight, based on the total monomer content of an ethylenically-unsaturated functional group-containing monomer having hydroxyl and carbonyl groups as functional groups selected from the group consisting of alkenoic acids having from 3 to 8 carbon atoms, alkenedioic acids having from 4 to 8 carbon atoms, N-methylolamides of said alkenoic acids and N-methylolamides and di-N-methylolamides of said alkenedioic acids, and
- (e) from 0 to 55% of other monomers copolymerizable with components (a), (b), (c) and (d),
- (2) from 0.05% to 20% by weight, based on the copolymer weight, of an epoxy compound having at least one epoxy group per molecule and having a mean epoxy equivalent weight of from 80 to 1,000, said epoxy compound being added after completion of copolymerization, and
- (3) from 0.05% to 20% by weight, based on the copolymer weight, of a polyamine hardener, said polyamine hardener being added after completion of copolymerization,
- said laminating and coating adhesive being capable of laminating at temperatures of between 60.degree. and 100.degree. C.
Dependencies are inferred from the claim text.