The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 25, 2014
Filed:
Feb. 22, 2007
Philip Berthels, Veltem-Beisem, BE;
Raf Elen, Oplinter, BE;
Luc Van Essche, Kortenberg, BE;
Huntsman International LLC, The Woodlands, TX (US);
Abstract
Process for preparing a polyurethane foam, according to the free rise process, the foam having a free rise density of 5-40 kg/m, comprising reacting at an index of 40-80 a polyisocyanate composition consisting of diphenylmethane diisocyanate and of homologues of diphenylmethane diisocyanate, said homologues having an isocyanate functionality of 3 or more, and wherein the polyisocyanate composition has an average isocyanate functionality of 2.10-2.40 and a 2,4'-diphenylmethane diisocyanate content of 6-45% by weight with the proviso that the relationship between this functionality (F) and content (C) is: −123F+287≦C≦−123F+311, and a polyoxyethylene polyoxypropylene polyol (polyol b1) having an oxyethylene content of 5-30% by weight, a nominal functionality of 2-4 and an average equivalent weight of 1000-3000, and comprising using 5-20 parts by weight, per 100 parts by weight of polyol b1, of water as blowing agent, an effective amount of a catalyst enhancing urethane formation, and an effective amount of a surfactant. Foams are claimed as well. The foams show good sound absorption and/or sound insulation.