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. 12, 1991
Filed:
Aug. 08, 1989
Applicant:
Inventors:
Hans-Joachim Scholl, Cologne, DE;
Josef Pedain, Cologne, DE;
Assignee:
Bayer Aktiengesellschaft, Bayerwerk, DE;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
544193 ; 544221 ; 544222 ; 524101 ; 528 48 ;
Abstract
The present invention is directed to catalysts obtained by mixing alkali fluorides with quaternary ammonium or phosphonium salts. The present invention is also directed to a process for the production of these catalysts by stirring alkali fluorides and quaternary ammonium or phosphonium salts in alcohol, separating any deposits formed, removing the alcohol and converting the catalyst into useful form by dilution in solvents or absorption onto support materials. Finally, the present invention is directed to the use of the new catalysts as trimerization catalysts for the production of polyisocyanates containing isocyanurate groups.