| 摘要 |
PURPOSE: A manufacturing method of polyesterimide varnish is provided to manufacture ester imide varnish which has a similar composition with a conventional composition and improved softening properties. CONSTITUTION: A manufacturing method of polyester imide varnish comprises a step of esterification excluding divalent alcohol and pre-reacting only one or more heat resistant trivalent or higher polyfunctional heat resistant alcohols and one or more polyfunctional basic acids or esters thereof to obtain heat resistant polyfunctional acid; and a step of mixing divalent alcohol, trivalent alcohol, or higher polyfunctional acid anhydride and a mono amino group and an amine-based compound with an additional functional group for additional esterification and amidification. |
