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:
Mar. 08, 1977
Filed:
May. 02, 1975
Robert J Lockwood, East Haven, CT (US);
Harold E Reymore, Jr, Wallingford, CT (US);
Edward J Thompson, Watertown, 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) an alkali metal salt of an N-substituted amide, (ii) an alkali metal salt of an N-(2-hydroxyphenyl)methyl glycine, and optionally a tertiary amine trimerization catalyst. The use of these catalyst combinations in the preparation of polyisocyanurate foams results in the facile continuous formation of laminate board stock. The polyisocyanurate foams produced using the novel catalyst combinations of the invention are characterized by having high resistance to heat distortion and volume change.