Patent ID: 8580913

Claim:
A polyimide resin containing at least one kind selected from the group consisting of a repeating unit represented by the following formula (1) and a repeating unit represented by the following formula (2): or a polyimide resin containing at least one kind selected from the group consisting of a repeating unit represented by the formula (1) and a repeating unit represented by the formula (2) and at least one kind of a repeating unit other than the repeating unit represented by the formula (1) or (2), which is represented by the following formula (3): (in the formula, X represents a divalent aliphatic group having from 2 to 39 carbon atoms, a divalent alicyclic group having from 3 to 39 carbon atoms, a divalent aromatic group having from 6 to 39 carbon atoms or a divalent group composed of a combination thereof; at least one kind of a bonding group selected from the group consisting of —O—, —SO 2 —, —CH 2 —, —C(CH 3 ) 2 —, —OSi(CH 3 ) 2 —, —C 2 H 4 O— and —S— may intervene in a main chain of X; and X may have at least one kind of a functional group selected from the group consisting of a carboxyl group, a hydroxyl group and a carbonyl group), wherein a proportion of the total sum of the repeating unit represented by the formula (1) and the repeating unit represented by the formula (2) is 50% by mole or more of the whole of the repeating units; and the polyimide resin contains a material obtained by reacting an end-capping component (W) which is 5-norbornene-2,3-dicarboxylic anhydride on a molecular end thereof, and wherein the polyimide resin is obtained by reacting a tetracarboxylic acid component (Y), a diamine component (Z) and said end-capping component (W), the polyimide resin being prepared in a ratio of from 0.8 to 0.98 moles for the tetracarboxylic acid component (Y) and from 0.4 to 0.02 moles for the end-capping component (W), respectively, per mole of the diamine component (Z), and the sum of the tetracarboxylic acid component (Y) and a half of the end-capping component (W) does not exceed one mole per mole of the diamine component (Z).