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...http://www.google.es/patents/US6328833?utm_source=gb-gplus-sharePatente US6328833 - Face-up coating of carpet backs with polyurethane
