Abstract

Polyesterimide varnishes are made by polycondensing and imidating a mixture of trimellitic anhydride, 4,4'-diamino-diphenyl methane, glycol, dimethyl terephthalate and trihydric alcohol (eg tris(hydroxyethyl) isocyanurate or glycerol) and optionally p,p'-dihydroxy-diphenyl-dimethyl methane, wherein the glycol or part of the glycol is 2-methyl-1,3-propanediol and/or 2-butyl-2-ethyl-1,3-propanediol. A transesterification catalyst may be added to the mixture and the resulting polyesterimide resin may subsequently be dissolved in an organic solvent with a crosslinking catalyst added.

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