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:
Jan. 18, 1977
Filed:
May. 19, 1975
Harold E Reymore, Jr, Wallingford, CT (US);
John K Zane, East Haven, CT (US);
The Upjohn Company, Kalamazoo, MI (US);
Abstract
A novel catalyst combination for the trimerization of polyisocyanates to polyisocyanurates is disclosed. The catalyst combination comprises (i) a tertiary amine trimerization catalyst, (ii) an alkali metal salt of an N-substituted amide, and (iii) a dibutyl tin di(alkanoate) compound. The use of this catalyst combination in the preparation of polyisocyanurate spray foams enables the systems to be sprayed in either a 1:1 or 2:1 by volume ratio, or ratios between these limits interchangably with no alterations being required in reactant formulations. The polyisocyanurate foams produced using the novel catalyst combination of the invention are characterized by having high resistance to flame and heat distortion.