Face-up coating of carpet backs with polyurethane
AssigneeBayer Antwerp N.V.
InventorsUlrich B. Holeschovsky, Jeffrey L. Robbins, Harry Stefanou, Leah Langsdorf, David Gibala, Robert R. Pollock
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Abstract
Tufted carpeting can be manufactured employing polyurethane adhesives and cured face up without dripping, when one or more drip-reducing process steps of adding a non-Newtonian thickener to the adhesive or forming a viscosified or cured film on the outer surface of the adhesive are practiced prior to entry of the greige good into the curing oven.
Claims14
In a process for the preparation of tufted carpeting wherein a tuft bind adhesive is applied to tufts penetrating a primary backing, the improvement comprising employing polyurethane adhesive as the tuft bind adhesive, and employing one or more drip-reducing processes, said processes selected from the group consisting of
- a) selecting as a tuft bind adhesive, a polyurethane adhesive containing a non-Newtonian thickener such that the viscosity measured at a shear rate of less than 1 sec−1 is more than double the viscosity measured at a shear rate of at least 50 sec−1, both viscosities measured at the same temperature;
- and
- b) selecting as a tuft bind adhesive, a polyurethane adhesive containing a viscosity index improving additive such that the decrease in viscosity of the adhesive at temperatures higher than ambient temperature is reduced as compared to an otherwise identical adhesive not containing the viscosity index improving additive;
- wherein said polyurethane adhesive is a liquid adhesive comprising one or more isocyanate-functional components, and one or more isocyanate-reactive components.
Dependencies are inferred from the claim text.