COATING MATERIAL WITH HIGH SCRATCH RESISTANCE

摘要

The present invention relates to a coating material comprising at least one aliphatic or cycloaliphatic polyisocyanate having an NCO functionality of at least 2, preferably 2.8 to 6, optionally at least one binder, preferably a hydroxyl-containing binder, at least one adduct of an isocyanatotrialkoxysilane and a polyhydric alcohol, with more than 90, more preferably more than 95, most preferably more than 99 percent of the hydroxyl groups in the polyhydric alcohol having been converted by reaction with the isocyanatotrialkoxysilane, and less than 0.1 wt % of the isocyanate groups from the isocyanatotrialkoxysilane being reactive in the adduct, at least one catalyst selected from the group consisting of Lewis acids, phosphoric acid or phosphorous acid and esters thereof, blocked or non-blocked sulphonic acids, sulphuric acid, carboxylic acids having a melting point >60° C. and tetraalkylammonium carboxylates, optionally at least one auxiliary, preferably at least one further crosslinker, and/or adjuvant, and optionally organic solvents, and also to a process comprising providing, applying to a surface and curing the coating material, to a coating obtainable by curing the coating material, and to use of the coating material for coating a metal, glass, plastic or wood surface.

主权项

1. A coating material comprising
an aliphatic or cycloaliphatic polyisocyanate having an NCO functionality of at least 2, optionally a binder, an adduct of an isocyanatotrialkoxysilane and a polyhydric alcohol, where more than 90 percent of the hydroxyl groups in the polyhydric alcohol have been converted by reaction with the isocyanatotrialkoxysilane, and less than 0.1 wt % of the isocyanate groups from the isocyanatotrialkoxysilane are reactive in the adduct, a catalyst selected from the group consisting of a Lewis acid, phosphoric acid, phosphorous acid and an ester thereof, blocked or non-blocked sulphonic acids, sulphuric acid, carboxylic acids having a melting point >60° C. and tetraalkylammonium carboxylates, an auxiliary selected from the group consisting of an isocyanate-free crosslinker, an additive, a stabilizer and an adjuvant, and optionally an organic solvent.