| 摘要 |
<p>A process for producing an aqueous polyurethane coating is provided. A polyisocyanate, a polyol and a dimethylol alkane acid of the following formula, <CHEM> where R is an alkyl group of 2 to 10 carbon atoms, are reacted in the presence of an organic solvent having a boiling point of 50 to 120 DEG C to thereby prepare an urethane polymer solution. The organic solvent is removed from the urethane polymer solution, and the resultant urethane polymer is then dissolved or dispersed in water. The coating is of a substantially solvent-free form without reliance on any solvent having a high boiling point which results in impaired coating environment and reduced coat quality. The coat therefrom is widely useful for construction materials, automotive parts, electrical parts and textile products in particular and also is highly effective for preventing volatile of organic compound from becoming emitted in the atmosphere.</p> |
