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:
May. 04, 1976
Filed:
Jul. 09, 1974
Applicant:
Inventors:
William J Farrissey, Jr, Northford, CT (US);
Abdul-Munim Nashu, Hamden, CT (US);
Assignee:
The Upjohn Company, Kalamazoo, MI (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ; B01J / ;
U.S. Cl.
CPC ...
260 / ; 260 / ; 260 / ; 252182 ; 252426 ;
Abstract
A novel catalyst combination for the trimerization of polyisocyanates to polyisocyanurates is disclosed. The catalyst combination comprises (i) a tertiary amine trimerization catalyst, and (ii) a quaternary ammonium salt of an alkanoic acid. The use of this catalyst combination in the preparation of polyisocyanurate foams enables the foaming speeds to be varied from relatively slow to fast in the absence of foam shrinkage. The foams produced in accordance with the present invention are useful in applications calling for relatively fast rise characteristics such as in laminate production.