| 摘要 |
<p>Oxidatively drying, carboxy gp. contg epoxide-modified polyurethanes (or copolymer resins) are prepd. by reacting (I) (a) 25-45 wt.% unsatd. fatty acids of iodine no. 130-390 (b/2-35 wt.% satd. aliphatic, satd. cycloaliphatic or aromatic mono- or poly-carboxylic acids (anhydrides) having carboxyl gps. bonded to sec or tert. C atoms, or mixts. (c) 2-30 wt.% mono- or poly-hydric org-hydroxyl cpds alone or in admixt. (d) 4-12 wt.% polyoxyalkylone cpds contg >=1 atom of active H and having av. mol. wt. 200-50,000 and (e) 1-35 wt.% epoxide cpds. contg >=1 epoxide gp, reacted stepwise by heating at 155-260 degrees C unitl the reaction prod. has an acid no. 0-300, and the resulting hydroxyl esters reacted by warming at 70-120 degrees C; with (II), 0.05-50 wt.% isocyanates, the reaction between (I) and (II) being effected with a ratio of total hydroxyl equivalents to isocyanate equivalents of 0.01 to 1-1.45 to 1.</p> |
