TDI based polyisocyanate mixture with a high solids content

US10730997B2 · kind B2 · utility

Assignee

• Covestro Deutschland AG · DE

Inventors

• Christoph Irle · Barcelona, ES
• Stefan Groth · Leverkusen, DE
• Ruiwen Wu · Leverkusen, DE
• Antonio Midolo · Cologne, DE
• Robert Maleika · Düsseldorf, DE
• Hongchao Li · Dongguan, CN
• Hao Liu · Beijing, CN

Key dates

• Filing date: Oct 18, 2017
• Grant date: Aug 4, 2020
• Expiry date: Oct 18, 2037

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D175/06
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

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 hasa) a solids content of from ≥51 to ≤90% by weight, based on the total weight of the polyisocyanate mixture andb) a content of monomeric tolylene diisocyanate of ≤0.9% by weight, based on the total weight of the polyisocyanate mixture, andthe 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.