Polyimide, polyimide film and laminated body
View Patent ↗A polyimide wherein a tetracarboxylic dianhydride including 3,3′,4,4′-phenyltetracarboxylic dianhydride as the essential component is the starting tetracarboxylic dianhydride component, and an amine comprising between 0.5 and 30 mole percent of a diamine represented by the following general formula is the starting diamine component. (wherein A is a direct bond or a crosslinking group, and R 1 -R 4 each represent a substituent). It is possible to obtain a polyimide, a polyimide film and a laminated body with an improved adhesion property and an improved moisture permeation rate, even without surface treatment, comprising, as the essential tetracarboxylic dianhydride, 3,3′,4,4′-biphenyltetracarboxylic dianhydride which has conventionally only yielded polyimides with low adhesive strength.
1. A polyimide comprising:
a tetracarboxylic dianhydride comprising 3,3′,4,4′-biphenyltetracarboxylic dianhydride as an essential component as a starting tetracarboxylic dianhydride component, and
a first amine comprising between about 0.5 and about 30 mole percent of a diamine, 4,4′ methylene-bis-(2,6-dimethylaniline), and the polyimide has a saturated water absorptivity of 1.3-3%.
2. The polyimide according to claim 1 further comprising a second starting diamine, which is para-phenylenediamine.
3. The polyimide according to claim 2 , wherein the starting dicarboxylic dian-hydride component is 3,3′,4,4′-biphenyltetracarboxylic dianhydride.
4. The polyimide according to claim 1 , wherein the starting dicarboxylic dianhydride component is 3,3′,4,4′-biphenyltetracarboxylic dianhydride.
5. The polyimide according to claim 1 , having a relative moisture permeation rate not lower than 2.5.
6. A polyimide film having on at least one side a layer comprising a polyimide according to claim 1 .
7. The polyimide film according to claim 6 , having an elastic modulus of at least about 400 kg/mm 2 and less than about 900 kg/mm 2 .
8. A polyimide film having on at least one side a layer comprising a polyimide according to claim 2 .
9. A polyimide film having on at least one side a layer comprising a polyimide according to claim 3 .
10. A polyimide film having on at least one side a layer comprising a polyimide according to claim 4 .
11. A laminated body obtained by laminating a base onto at least one side of a layer comprising a polyimide according to claim 1 , either directly or via a heat-resistant adhesive.
12. A laminated body obtained by laminating a base onto at least one side of a layer comprising a polyimide according to claim 2 , either directly or via a heat-resistant adhesive.
13. A laminated body obtained by laminating a base onto at least one side of a layer comprising a polyimide according to claim 3 , either directly or via a heat-resistant adhesive.
14. A laminated body obtained by laminating a base onto at least one side of a layer comprising a polyimide according to claim 4 , either directly or via a heat-resistant adhesive.
15. The laminated body according to claim 11 , wherein the base is a metal layer.
16. The laminated body according to claim 15 , wherein the base is a metal foil.
17. The laminated body according to claim 16 , wherein the metal foil is a copper foil.