Abstract: A method for producing an adhered or sealed anodized aluminum product or a glass product surface-treated by metal or a metal compound, by using as adhesive or sealant a curable composition, in an adhering treatment or sealing treatment of an adhesion substrate composed of anodized aluminum or glass surface-treated by metal or a metal compound, wherein the curable composition comprising (A) a saturated hydrocarbon polymer having at least one silicon-containing group crosslinkable by forming a siloxane bond and having a hydroxyl group or a hydrolyzable group bonded to the silicon atom, and (B) a silane coupling agent selected from a group comprising an epoxy group-containing silane coupling agent and an isocyanate group-containing silane coupling agent.

Abstract: The present invention provides a copolyimide characterized in that the copolyimide contains units represented by formulas (I) and (II) ##STR1## (wherein R.sub.0 represents an aromatic tetracarboxylic residue). The polyimide has excellent thermal dimensional stability, and can be fabricated by using conventional inexpensive materials.

Abstract: Disclosed is a film of polyimide having repeating units of formula (1) and a birefringence (.DELTA.n) of at least 0.13: ##STR1## wherein R.sup.1 is an aromatic group having a valency of 4, at carbon atoms constituting the aromatic ring, and R.sup.2 is an aromatic group having a valency of 2, at carbon atoms constituting the aromatic ring. This polyimide film exhibits good thermal dimensional stability.

Abstract: A polyimide copolymer having a repeating unit of formula (I): ##STR1## wherein each of R.sub.1 and R.sub.2 is independently ##STR2## and R.sub.1 and R.sub.2 are different from each other, R.sub.0 is an aromatic group having a valency of 4, and m is a positive integer. The polyimide copolymer is excellent in heat resistance, mechanical properties (e.g., tensile elongation) and thermal dimensional stability.