| 摘要 |
The subject of the present invention is a composition comprising: at least one masked or unmasked polyisocyanate in the form of an aqueous emulsion whose mean size is between 0.1 and 10 micrometers and preferably smaller than 2 and larger than 0.2 micrometers, at least one polyhydroxylated polymer, advantageously a polyol, in the form of a second aqueous dispersion whose mean size is between 10 and 200 nanometers. This composition is defined in that the quantity of polyol in the mixture is chosen so as to meet one of the following two constraints: the polyol content, expressed in mass per cent, is at least equal to 35-0.75R, advantageously at least equal to 40-0.75R, preferably to 45-0.75R; the polyol content, expressed in mass per cent, does not exceed 45-2R, advantageously does not exceed 40-2R, preferably 35-2R with R equal to the ratio of the mean size (d50) of the emulsion to that of the polyol dispersion.
|
