POLYURETHANE AQUEOUS DISPERSIONS AND PREPARATION METHOD
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United States of America Patent
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Issued Date -
Apr 10, 2003
app pub date -
Mar 7, 2000
filing date -
Mar 25, 1998
priority date (Note) -
Abandoned
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Abstract
The invention relates to a process for preparing aqueous polyurethane dispersions, which comprises the following steps: (a) formation of a prepolymer having NCO functional groups by reaction, in a solvent, of a polyisocyanate, a polydiene having hydroxyl terminal groups and a mass {overscore (M)}.sub.n of at least 2000 and a diol containing neutralized acid functional groups, the NCO functional groups being in excess with respect to the OH functional groups; b) dispersion of the prepolymer in water; (c) addition of a diamine-type chain extender; (d) evaporation of the solvent in order to obtain an aqueous polyurethane-urea dispersion. It also relates to aqueous dispersions essentially containing no solvent and containing 30 to 40% by weight solids; the coatings that are obtained from these dispersions are particularly hydrophobic.
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