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AssigneeWacker Chemie AG
InventorsJohn Richard BOYLAN, Dennis SAGL
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A crepe process includes applying an adhesive composition to a nonwoven web, drying, and creping the nonwoven web on a creping drum. The improvement includes using an adhesive composition that includes an aqueous copolymer dispersion obtained by emulsion polymerization of a monomer mixture including 65 to 94.5% by weight of vinyl acetate, 5 to 30% by weight of ethylene, (meth)acrylamide, and 0.1 to 4% by weight of an N-methylol functional monomer. The N-methylol functional monomer constitutes from 25 to 85% by weight of the combined amounts of acrylamide and N-methylol functional monomer, which combined amounts constitute from 0.5 to 5% by weight of the monomer mixture. The emulsion polymerization is performed in the presence of 1 to 10% by weight of polyvinyl alcohol, based on the total weight of all monomers used for the polymerization. The adhesive composition does not include alkylphenol ethoxylates, phosphate ester surfactants, or sodium laureth sulfate.
In a crepe process that comprises applying an adhesive composition to a nonwoven web, drying, and creping the nonwoven web on a creping drum, the improvement comprising using an adhesive composition that comprises an aqueous copolymer dispersion obtained by emulsion polymerization of a monomer mixture comprising 65 to 94.5% by weight of vinyl acetate, 5 to 30% by weight of ethylene, (meth)acrylamide, and 0.1 to 4% by weight of an N-methylol functional monomer, wherein the N-methylol functional monomer constitutes from 25 to 85% by weight of the combined amounts of acrylamide and N-methylol functional monomer, said combined amounts constituting from 0.5 to 5% by weight of the monomer mixture;
The process of any preceding claim, wherein the monomer mixture comprises from 0.3 to 3.0% by weight of the N-methylol functional monomer.
The process of any preceding claim, wherein the N-methylol functional monomer is N-methylolacrylamide.
The process of any preceding claim, wherein acrylamide and N-methylolacrylamide are present in a 1:1 mole ratio in the monomer mixture.
The process of any preceding claim, wherein the copolymer has a Tg in a range from −10° C. to +20° C.
The process of any preceding claim, wherein the copolymer has a Tg in a range from 0° C. to 15° C.
The process of any preceding claim, wherein the polyvinyl alcohol has a degree of hydrolysis in a range from 86% to 89 mol %.
The process of any preceding claim, wherein the process is a double recreping process.
A double recreped nonwoven web made by the process of any preceding claim.
Dependencies are inferred from the claim text.