Patent ID: 6949619

Claim:
A polyimide resin comprising recurring units of the following structural formulae (1) and (2) and prepared using a diamine bearing an aromatic ring having an amino radical attached thereto and another aromatic ring having a phenolic hydroxyl radical so that the polyimide resin has phenolic hydroxyl radicals in its skeleton, wherein X is at least one tetravalent organic radical selected from the group [I]; Y is a divalent organic radical comprising a diamine residue Y 1 having a phenolic hydroxyl radical represented by the formula [II] and an aromatic diamine residue Y 2 selected from the group [III]; Z is a siloxane diamine residue represented by the formula [IV]; Y 1 /(Y 1 +Y 2 ) being from 0.01 to 1 in a molar ratio, m and n are natural numbers, satisfying 0.1 ≦m/(m+n)≦0.99 and 10≦m+n≦500, wherein R is independently a hydrogen atom, halogen atom or substituted or unsubstituted monovalent hydrocarbon radical of 1 to 8 carbon atoms, wherein A is a radical selected from the group [IIa] and B is a radical selected from the group [IIb]: R is as defined above, and k is a natural number of 1 to 5, wherein R is as defined above, wherein R 1 is independently a C 1-8 alkylene or arylene radical, R 2 is independently a C 1-8 alkyl, alkoxy or aryl radical, and j is an integer of 4 to 60.