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:
Jun. 20, 1995
Filed:
Dec. 30, 1992
Herbert Gebauer, Krefeld, DE;
Pramod Gupta, Bedburg, DE;
Martin Hoppe, Leverkusen, DE;
Rolf Wiedermann, Odenthal-Voiswinkel, DE;
Bayer Aktiengesellschaft, Leverkusen, DE;
Abstract
An isocyanate terminated prepolymer based upon diphenylmethane isocyanates. This prepolymer is the reaction product of a diphenylmethane isocyanate mixture having from about 75 to about 95 wt % binuclear isomers and from about 5 to about 25 wt % polymeric isocyanate with a polyether polyol. The binuclear isomer content is generally from about 15 to about 40 wt % 2,4'-isomer and from about 2 to about 10 wt % 2,2'-isomer. The polyether polyol has a functionality of from about 3 to about 8, an OH number of from about 350 to about 1000 mg KOH/g and a molecular weight of from about 150 to about 1000. These prepolymers are particularly useful as starting materials for the production of light-colored, dimensionally stable rigid polyurethane foams.