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:
Nov. 22, 1983
Filed:
Sep. 20, 1982
Glenn R Svoboda, Grafton, WI (US);
William L Carlstrom, West Bend, WI (US);
Richard T Stoehr, West Bend, WI (US);
Freeman Chemical Corporation, Port Washington, WI (US);
Abstract
Low smoke isocyanurate modified polyurethane foams are prepared from polyols and a stoichiometric excess of reactive isocyanates providing an --NCO/--OH index of 1.3-3.0, preferably from 1.6-2.3. Catalysts for the trimerization reaction of the isocyanate to the isocyanurate form are employed. The polyol used in the present invention includes from 5-100% of a digestion product which is prepared by digesting polyalkylene terephthalate residues in organic polyols. The foams produced by the method of the present invention possess unexpected properties in such areas as flame spread, smoke, and low friability. The use of the polyols described above can substantially reduce product cost, allowing the isocyanurate modified polyurethane foams of the present invention to be utilized in commercial applications.