Provided is a laminate which comprises a layer of a polyimide resin and a layer of an unvulcanized rubber composition, and wherein the rubber composition contains (A) a rubber component, (B) 20-100 parts by mass of a polyamide polyether elastomer per 100 parts by mass of the rubber component (A), (C) a condensation product of formaldehyde and a compound represented by formula (1) (wherein each of R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 is independently selected from the group consisting of a hydrogen atom, a hydroxyl group, an alkyl group having 1-8 carbon atoms, a hydroxyalkyl group having 1-8 carbon atoms and an alkoxide group having 1-8 carbon atoms), (D) a methylene donor and (E) a vulcanizing agent. A laminate according to the present invention exhibits improved bonding strength between a layer of a polyimide resin and a layer of a rubber composition.

A nitrile group-containing copolymer rubber containing 10 to 30 wt % of an ,-ethylenically unsaturated nitrile monomer unit, 1 to 10 wt % of a fumaric acid monoester monomer unit, and 1 to 50 wt % of an ,-ethylenically unsaturated monocarboxylic acid ester monomer unit and having an iodine value of 120 or less.

By the use of special cross-linkers that contain at least two isocyanate groups, hydroxyl group-containing optionally hydrogenated nitrile rubber polymers can be successfully cross-linked. Preferred cross-linkers contain allophanate, biuret, uretdione, uretonimine, bridged carbamate, carbodiimide, isocyanurate, iminooxadiazinedione or oxadiazinetrione structural elements.

By the use of special cross-linkers that contain at least two isocyanate groups, hydroxyl group-containing optionally hydrogenated nitrile rubber polymers can be successfully cross-linked. Preferred cross-linkers contain allophanate, biuret, uretdione, uretonimine, bridged carbamate, carbodiimide, isocyanurate, iminooxadiazinedione or oxadiazinetrione structural elements.

A nitrile rubber composition including a filler (B) in a content of 50 to 90 parts by weight and an adipic acid ester-based plasticizer and/or an ether ester-based plasticizer (C) in a content of 0 to 29.9 parts by weight in relation to 100 parts by weight of a nitrile group-containing highly saturated copolymer rubber (A) including an ,-ethylenically unsaturated nitrile monomer unit in an proportion of 14 wt % or more and less than 21 wt %, and having an iodine value of 120 or less.

A nitrile rubber composition including a filler (B) in a content of 50 to 90 parts by weight and an adipic acid ester-based plasticizer and/or an ether ester-based plasticizer (C) in a content of 0 to 29.9 parts by weight in relation to 100 parts by weight of a nitrile group-containing highly saturated copolymer rubber (A) including an ,-ethylenically unsaturated nitrile monomer unit in an proportion of 14 wt % or more and less than 21 wt %, and having an iodine value of 120 or less.

A nitrile rubber composition including a filler (B) in a content of 50 to 90 parts by weight and an adipic acid ester-based plasticizer and/or an ether ester-based plasticizer (C) in a content of 0 to 29.9 parts by weight in relation to 100 parts by weight of a nitrile group-containing highly saturated copolymer rubber (A) including an ,-ethylenically unsaturated nitrile monomer unit in an proportion of 14 wt % or more and less than 21 wt %, and having an iodine value of 120 or less.

A metal foil with resin is a metal foil with resin including a metal foil and a resin layer disposed on the metal foil, resin layer being obtained by half-curing a resin composition. The resin composition contains a first component that is a polymer, a second component that is a polyarylene ether copolymer, and a third component that is an epoxy resin. The first component has structures represented by formulae (1) and (2) below, with no unsaturated bond between carbon atoms. The third component has two or more epoxy groups per molecule. The second component is compatible with the first component, and the third component is incompatible with the first component. In the formulae (1) and (2), a ratio between x and y is x:y=0:1 to 0.35:0.65, R1 represents hydrogen atom or methyl group, and R2 represents hydrogen atom or an alkyl group. ##STR00001##

A metal foil with resin is a metal foil with resin including a metal foil and a resin layer disposed on the metal foil, resin layer being obtained by half-curing a resin composition. The resin composition contains a first component that is a polymer, a second component that is a polyarylene ether copolymer, and a third component that is an epoxy resin. The first component has structures represented by formulae (1) and (2) below, with no unsaturated bond between carbon atoms. The third component has two or more epoxy groups per molecule. The second component is compatible with the first component, and the third component is incompatible with the first component. In the formulae (1) and (2), a ratio between x and y is x:y=0:1 to 0.35:0.65, R1 represents hydrogen atom or methyl group, and R2 represents hydrogen atom or an alkyl group. ##STR00001##

Provided is a crosslinked rubber having excellent workability and heat resistance, and a crosslinkable rubber composition that can be used to form the crosslinked rubber. The crosslinkable rubber composition contains: a rubber including a carboxyl group-containing ethylenically unsaturated monomer unit; an amine-based crosslinking agent having a melting point of at least 50 C. and no higher than 180 C.; and one or more carbon nanotubes. The crosslinked rubber is obtainable through crosslinking of the crosslinkable rubber composition. The carbon nanotubes preferably have a BET specific surface area of from 600 m.sup.2/g to 2,000 m.sup.2/g.