Polyimide and its use as a high-temperature adhesive.

摘要

This invention relates to a novel polyimide and describes method of its preparation, adhesives of the polyimide and the method for their application.

The polyimide has recurring units of the formula
<Chemistry id="chema01" num="0001"><Image id="ia01" he="31" wi="83" file="IMGA0001.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>(where R is a tetra-valent radical selected from the group consisting of aliphatic radical having not less than two carbons, cyclo-aliphatic radical, monoaromatic radical, condensed polyaromatic radical, and non condensed polyaromatic radical wherein aromatic radicals are mutually connected with a bond or a crosslinking function).

The polyimide can be prepared by reacting 2,6-bis(3--amino-phenoxy)pyridine with tetracarboxylic dianhydride in an organic solvent and imidizing resultant polyamic acid.

Various tetracarboxylic dianhydrides can be used and particularly preferred are pyromellitic dianhydride and 3,3',4,4'--benzophenonetetracarboxylic dianhydride.