Polyimide resin composition

A polyimide resin composition substantially comprising 99.9.about.50 parts by weight of polyimide comprising a requisite structural unit consisting of one or more recurring structural units of the formula (1):

• ##STR69## wherein X is a radical selected from the group consisting of a direct bond, isopropylidene, hexafluoroisopropylidene, carbonyl, thio and sulfonyl, and R is a tetravalent radical having 2.about.27 carbon atoms and being selected from the group consisting of an aliphatic radical, alicyclic radical, monoaromatic radical, condensed polyaromatic radical and noncondensed aromatic radical connected to each other with a direct bond or a bridge member, and 0.1.about.50 parts by weight of polyimide having recurring structural units of the formula (5):
• ##STR70##

A polyimide resin composition substantially comprising 99.9.about.50 parts by weight of polyimide comprising a requisite structural unit consisting of one or more recurring structural units of the formula (1):

• ##STR71## wherein X is a radical selected from the group consisting of a direct bond, isopropylidene, hexafluoroisopropylidene, carbonyl, thio and sulfonyl, and R is a tetravalent radical having 2.about.27 carbon atoms and being selected from the group consisting of an alkyl radical, alicyclic radical, monoaromatic radical, condensed polyaromatic radical and noncondensed aromatic radical connected to each other with a direct bond or a bridge member, and 0.1.about.50 parts by weight of polyimide having recurring structural units of the formula (6):
• ##STR72##

A polyimide resin composition substantially comprising 99.9.about.50 parts by weight of polyimide comprising a requisite structural unit consisting of one or more recurring structural units of the formula (1):

• ##STR73## wherein X is a radical selected from the group consisting of a direct bond, isopropylidene, hexafluoroisopropylidene, carbonyl, thio and sulfonyl, and R is a tetravalent radical having 24.about.27 carbon atoms and being selected from the group consisting of an alkyl radical, alicyclic radical, monoaromatic radical, condensed polyaromatic radical and noncondensed aromatic radical connected to each other with a direct bond or a bridge member, and 0.1.about.50 parts by weight of polyimide having recurring structural units of the formula (7) ##STR74##

A polyimide resin composition substantially comprising 99.9.about.50 parts by weight of polyimide comprising a requisite structural unit consisting of one or more recurring structural units of the formula (1):

• ##STR75## wherein X is a radical selected from the group consisting of a direct bond, isopropylidene, hexafluoroisopropylidene, carbonyl, thio and sulfonyl, and R is a tetravalent radical having 2.about.27 carbon atoms and being selected from the group consisting of an alkyl radical, alicyclic radical, monoaromatic radical, condensed polyaromatic radical and noncondensed aromatic radical connected to each other with a direct bond or a bridge member, and 0.1.about.50 parts by weight of polyimide having recurring structural units of the formula (8) ##STR76##

A polyimide resin composition substantially comprising 99.9.about.50 parts by weight of polyimide comprising a requisite structural unit consisting of one or more recurring structural units of the formula (1):

• ##STR77## wherein X is a radical selected from the group consisting of a direct bond, isopropylidene, hexafluoroisopropylidene, carbonyl, thio and sulfonyl, and R is a tetravalent radical having 2.about.27 carbon atoms and being selected from the group consisting of an alkyl radical, alicyclic radical, monoaromatic radical, condensed polyaromatic radical and noncondensed aromatic radical connected to each other with a direct bond or a bridge member, and 0.1.about.50 parts by weight of polyether pyridine comprising a requisite structural unit consisting of one or more recurring structural units of the formula (4) ##STR78## wherein Y is a divalent radical represented by ##STR79##

A polyimide copolymer obtainable by reacting 0.5 to 0.95 mole of diamine represented by the formula (11) ##STR81## and 0.5 to 0.05 mole of diamine represented by the formula (13):

• ##STR82## with tetracarboxylic dianhydride represented by the formula (12):
• ##STR83## wherein R is a tetravalent radical having 2.about.27 carbon atoms and being selected from the group consisting of an alkyl radical, alicyclic radical, monoaromatic radical, condensed polyaromatic radical and noncondensed aromatic radical connected to each other with a direct bond or a bridge member.

A polymide based resin composition comprising 100 parts by weight of the polymide resin composition of any of claims 1-6 and 5 to 65 parts by weight of a fibrous reinforcement.

A polyimide based resin composition comprising 100 parts by weight of the polyimide resin composition of claim 7 and 5 to 65 parts by weight of a fibrous reinforcement.

A polyimide based resin composition comprising 100 parts by weight of the polyimide resin composition of claim 10 and 5 to 65 parts by weight of a fibrous reinforcement.

A polyimide based resin composition comprising 100 parts by weight of the polyimide resin composition of claims 8 or 9 and 5 to 65 parts by weight of a fibrous reinforcement.