| abstract |
In the present invention, tetracarboxylic dianhydride containing 3,3 ', 4,4'-biphenyltetracarboxylic dianhydride as an essential component is a starting component of tetracarboxylic dianhydride, and is represented by 0.5 to diamine represented by the following general formula. Diamines comprising 30 mol% relate to novel polyimides which are the starting components of diamines.n n n n n n n n Wherein A is a direct bond or a crosslinkable group, each of R 1 to R 4 represents a substituent selected from hydrogen, hydroxyl, carboxyl, C1-6 hydrocarbon, C1-6 alkoxy and carboalkoxy, R 1 And at least one of R 2 is not hydrogen and at least one of R 3 and R 4 is not hydrogen)n n n Tetracarboxylic dianhydride, which is an essential polycarboxylic acid, includes 3,3 ', 4,4'-biphenyltetracarboxylic dianhydride, which generates only low adhesive strength, and has a high adhesive property and improved moisture permeability without surface treatment. Mids, polyimide films, and laminates can be obtained.n n n Polyimide, polyimide film, laminate, tetracarboxylic dianhydride, diamine |