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:
Aug. 04, 2020
Filed:
Oct. 18, 2017
Covestro Deutschland Ag, Leverkusen, DE;
Christoph Irle, Köln, DE;
Stefan Groth, Leverkusen, DE;
Ruiwen Wu, Leverkusen, DE;
Antonio Midolo, Köln, DE;
Robert Maleika, Dusseldorf, DE;
Hongchao Li, Shanghai, CN;
Hao Liu, Shanghai, CN;
Covestro Deutschland AG, Leverkusen, DE;
Abstract
The invention relates to a polyisocyanate mixture comprising at least one polyisocyanurate which is based on tolylene diisocyanate and has isocyanate groups and at least one polyurethane which is based on tolylene diisocyanate and has isocyanate groups, wherein the polyisocyanate mixture has a) a solids content of from ≥51 to ≤90% by weight, based on the total weight of the polyisocyanate mixture and b) a content of monomeric tolylene diisocyanate of ≤0.9% by weight, based on the total weight of the polyisocyanate mixture, and the polyisocyanurate which is based on tolylene diisocyanate and has isocyanate groups has a polydispersity D of from ≥1 to ≤1.5, based on the total weight of the polyisocyanurate which is based on tolylene diisocyanate and has isocyanate groups, where the polydispersity D is the ratio of weight average and number average molecular weight of the polyisocyanurate and the weight average and number average molecular weight is in each case determined by means of gel permeation chromatography using a polystyrene standard and tetrahydrofuran as eluent in accordance with DIN 55672-1:2016-03.