| 摘要 |
This invention relates to the process for the preparation of aqueous polyurethane dispersions, which comprises preparing an isocynate terminated carboxyl group containing prepolymer, by preparing a solution of a polyol in an organic solvent, adding an ionic group containing compound to this solution, heating this mixture at a controlled temperature, adding an isocyanate in the reaction mixtute optionally in the presence of a catalyst depending upon the isocynate, stirring, neutralizing and cooling the mixture at ambient temperatures and finally dispersing the mixture in water to obtain the product.
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