New polyisocyanate mixtures, a process for their preparation...

Details New polyisocyanate mixtures, a process for their preparation... New polyisocyanate mixtures, a process for their preparation...

C - Chemistry, Metallurgy

08

G

C08G 18/70 (2006.01) C08G 18/78 (2006.01) C08G 71/02 (2006.01) C08G 71/04 (2006.01)

Patent

CA 2527548

The present invention relates to polyacrylate-modified polyisocyanates which are i) prepared from aromatic, araliphatic, cycloaliphatic and/or aliphatic polyisocyanates having an NCO content of 5% to 25% by weight, an NCO functionality >= 2, a viscosity measured as solvent free resin of 150 to 200,000 mPa.cndot.s at 23°C, and ii) contain at least one structural unit of the formula (I) Image wherein R is hydrogen or a methyl group, R1 is an optionally heteroatom-containing hydrocarbon radical and R2 is a hydrocarbon radical having at least one isocyanate group and optionally urethane, allophanate, biuret, uretdione, isocyanurate and/or iminooxadiazinedione groups and n ist a number >= 1. The present invention also relates to a process for preparing these polyisocyanates and to binder compositions containing these polyisocyanates, which may be hydrophilically modified, and a compound having NCO-reactive groups.

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