Covestro Deutschland Ag

Covestro Intellectual Property Gmbh & Co. Kg

Antonio Midolo

Stefan Groth

Ruiwen Wu

Hao Liu

Christoph Irle

Robert Maleika

Hongchao Li

Hao Lui

The invention relates to a process for producing a polyisocyanate composition comprising addition of at least one isocyanate-inert solvent to at least one polyisocyanate, characterized in that the addition of the solvent is carried out in one or more stages and at least one of these stages is performed as a continuous dilution. The invention further relates to the polyisocyanate compositions obtainable by the process, to the use of the polyisocyanate compositions, to a two-component system containing the polyisocyanate composition and to composite systems produced with the two-component system.

Continuous dilution of polyisocyanates

The invention relates to a polyisocyanate which is based on tolylene 2,4-diisocyanate, tolylene 2,6-diisocyanate or a mixture of tolylene 2,4- and 2,6-diisocyanate and has isocyanurate groups, wherein the polyisocyanate has

TDI based low-viscosity polyisocyanates with isocyanurate groups

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 &#x2265;51 to &#x2264;90% by weight, based on the total weight of the polyisocyanate mixture and b) a content of monomeric tolylene diisocyanate of &#x2264;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 &#x2265;1 to &#x2264;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.

TDI based polyisocyanate mixture with a high solids content

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Cologne, Germany

Antonio Midolo