| 摘要 |
<p>Polyol-polycarbonates having a molecular weight comprised within the range of from 750 to 2500, endowed with good rheologic characteristics and having a low glass transition temperature (Tg), are obtained by means of the reaction, under transesterification conditions, of (a) an organic carbonate; (b) a saturated alifatic alpha , omega -glycol; and (c) tris-(hydroxyethyl)-isocyanurate. These polyol-polycarbonates are useful as bases for paints in combination with polyisocyanates. Furthermore, the polyol-polycarbonates can be reacted with bicarboxy acids, or with cyclic anhydrides in order to yield the corresponding products with carboxy end groups which are useful as bases for paints in combination with melaminic or epoxy resins.</p> |
