| 摘要 |
Polyester-polyimide resins having a hydroxyl value of 150 to 600 and containing repeating units derived from tris-(2-hydroxyethyl) isocyanurate or tris-(2-carboxyethyl) isocyanurate are known valuable film-forming agents in wire enamels. Enamels of low viscosity at high solids content can be prepared by dissolving the resins in solvent systems free from phenols and containing at least 30% (wt.) diacetylacetone, monoalkylesters of ethylene glycol, diethylene glycol and the like, and lower alkanoic acid esters of the ethers, and these solvent components are less irritating and partly less toxic than solvents employed heretofore. |
