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:
Nov. 20, 2018
Filed:
Feb. 13, 2015
Covestro Deutschland Ag, Leverkusen, DE;
Frank Richter, Leverkusen, DE;
Covestro Deutschland AG, Leverkusen, DE;
Abstract
The invention relates to a method for modifying isocyanates, wherein at least one organic monomer isocyanate having an NCO functionality >1 is oligomerised in the presence of at least one catalyst, said method being characterised in that the catalyst comprises at least one specific compound having an NPN sequence selected from compounds of formula I (formula I), and/or from compounds of formula II (formula II) where HX represents an acid with a pKa value ≥2, Xrepresents the anion of an acid with a pKa value ≥2, and n represents an integer or fractional number between 0 and 20, wherein Y represents R(R)N— and/or one or more substituents of the structure of formula III (formula III) and wherein Rto Rindependently represent identical or different substituents selected from C-Calkyl-, C-Ccycloalkyl- and C-Caryl groups, or wherein Rand R, Rand R, Rand R, Rand R, Rand R, Rand R, Rand R, Rand R, Rand Rindependently represent identical or different substituents selected from C-Calkylene-, C-Ccycloalkylene-, C-Carylene groups, and can form a 3- to 12-membered ring with the N atom joined to the P atom. The invention also relates to the use of a catalyst of this type.