New developments in polybenzhydrolimide resins: Application in the field of heat resistant coatings, adhesives and laminates

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Abstract
The approach to obtaining fully cyclised polyimides is based on the interactions between a benzhydrol group carried in the polyimide main chain and the solvent. The CH of the benzhydrol function is an efficient 1H‐NMR probe in order to follow the extent of imide cyclisation, as shown using benzhydrol tetracarboxylic dimethylester (5.95 ppm), the corresponding diamide diacid (6.20 ppm) and the final imide (6.35 ppm).Three types of polybenzhydrolimides are described. A linear AABB polymide was prepared from benzhydrol tetracarboxylic dimethylester obtained by hydrogenation of the corresponding industrial ketonic tetraacid diester. The solution properties of the polyimide and the extent of imide cyclisation are discussed.The synthesis of a linear AB polymer from (3‐aminophenyl)‐4‐hydroxymethyl monomethylphthalate is described. This product is used as silver filled adhesive for electronic applications.A cyclised nadimide end‐capped benzhydrolimide oligomer (Mw=1940, Mn = 1370) is soluble in diglyme. The crosslinking of this oligomer starts at 275°C and the properties of the network according to the curing cycle are discussed.

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