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:
Dec. 26, 2000
Filed:
Dec. 08, 1998
Rick L Adkins, New Martinsville, WV (US);
Clarence D Blue, New Martinsville, WV (US);
Jeffrey S Bolton, Krefeld, DE;
Kirk J Bourgeois, Menominee, MI (US);
Mark R Kratz, League City, TX (US);
Brian H Peterson, Minneapolis, MN (US);
Roger C Suter, Friendly, WV (US);
Kenneth P Yonek, McMurray, PA (US);
Bayer Corporation, Pittsburgh, PA (US);
Abstract
This invention relates to a process for the reduction of color of polymethylene poly(phenylisocyanates). This process comprises mixing a polymethylene poly(phenylisocyanate) with an epoxide having an epoxide equivalent weight of about 44 to about 700, and heating this mixture to a temperature of from about 35 to about 150.degree. C. for at least about 15 minutes, with stirring. Suitable epoxides include epoxidized fatty acid monoglycerides, epoxidized fatty acid diglycerides, epoxidized fatty acid triglycerides, epoxidized dimer fatty acids and epoxidized trimer fatty acids.