TDI BASED POLYISOCYANATE MIXTURE WITH A HIGH SOLIDS CONTENT

WIPO Patent Application WO/2018/076198

A1

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.

IRLE CHRISTOPH (DE)
GROTH STEFAN (DE)
WU RUIWEN (DE)
MIDOLO ANTONIO (DE)
MALEIKA ROBERT (DE)
LI HONGCHAO (CN)
LIU HAO (CN)

PCT/CN2016/103356

May 03, 2018

October 26, 2016

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COVESTRO DEUTSCHLAND AG (DE)
COVESTRO POLYMERS CHINA CO LTD (CN)

C07C265/14; C08G18/76; C08G18/79; C09D175/04

WO2007064921A2

2007-06-07

JP2001240839A	2001-09-04
JP2003268065A	2003-09-25
EP1403300A1	2004-03-31
JP2003221426A	2003-08-05

CHINA PATENT AGENT (H.K.) LTD. (CN)

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