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AssigneeWacker Chemical Corporation
InventorsJoel Erwin Goldstein, Ronald Joseph Pangrazi
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This invention is directed to alkylphenol ethoxylate (APE)-free polymer binders formed by aqueous free radical emulsion polymerization and having specific peel and cure properties. The APE-free polymeric binders have a peel value, when adhered to a heated metal surface, of 35% to 200% of the peel value shown by a standard APE-based polymer binder control and exhibit a cure profile such that at least 55% cure is achieved within 30 seconds at a temperature required for cure, and a wet tensile strength at 30-seconds of cure of at least 1000 g/5 cm. Wet tensile strength is used as a measure of cure. Binders having the peel and cure properties described herein can be considered for use in crepe processes, especially DRC processes.
In a crepe process that comprises applying a polymer binder to a nonwoven web, drying, and creping the nonwoven web on a creping drum, the improvement which comprises using an alkylphenol ethoxylate free aqueous polymer emulsion binder formed by aqueous free radical emulsion polymerization of one or more ethylenically unsaturated monomers and one or more crosslinking monomers, said binder having a peel value of 35% to 200% of a standard alkylphenol ethoxylate-based vinyl acetate-ethylene polymer emulsion control, a cure profile in which 55% cure is achieved within 30 seconds of being exposed to a temperature required for cure, and a wet tensile strength at 30 seconds of cure of at least 1000 g/5 cm.
Dependencies are inferred from the claim text.