Method of evaluating polymide dissolution rate, method of producing polymide, and polymide obtained using same methods

1. A method of evaluating a dissolution rate of a polyimide by Raman spectroscopy, wherein a Raman spectral intensity I(a) of imide groups contained within the polyimide is measured, and I(a) is compared with a Raman spectral intensity I(b) of imide groups contained within a polyimide with a known dissolution rate, wherein the polyimides are obtained using an aromatic tetracarboxylic dianhydride and/or an aromatic diamine, and, wherein an intensity ratio I(a 1 )/I(a 2 ) between a Raman spectral intensity I(a 1 ) of imide groups and a Raman spectral intensity I(a 2 ) of aromatic rings contained within the polyimide is compared with an intensity ratio I(b 1 )/I(b 2 ) between a Raman spectral intensity I(b 1 ) of imide groups and a Raman spectral intensity I(b 2 ) of aromatic rings contained within the polyimide with a known dissolution rate.

2. The method of evaluating a dissolution rate according to claim 1 , wherein a correlation equation between an intensity ratio I(b 1 )/I(b 2 ) between a Raman spectral intensity I(b 1 ) of imide groups and a Raman spectral intensity I(b 2 ) of aromatic rings contained within the polyimide with a known dissolution rate, and a dissolution rate of the polyimide is used as a calibration curve.

3. The method of evaluating a dissolution rate according to claim 1 , wherein the aromatic rings are benzene rings.

4. A method of producing a polyimide, comprising (1) obtaining a polyamic acid using the tetracarboxylic dianhydride and the diamine, and (2) obtaining the polyimide by heating the polyamic acid, wherein an evaluation of dissolution rate is made using the method of evaluating a dissolution rate according to claim 1 , and reaction control is conducted based on a result of the evaluation of dissolution rate.

5. A method of producing a polyimide according to claim 4 , wherein the evaluation of dissolution rate is conducted on-line or in-line.

6. A method of producing a polyimide according to claim 4 , wherein the dissolution rate evaluation is conducted during the process (2), and a heating temperature and/or a heating time is controlled based on a result of the dissolution rate evaluation.

7. A method of producing a polyimide according to claim 6 , wherein a viscosity evaluation of the polyimide is conducted during the process (2), and a heating temperature and/or a heating time is controlled based on results of the dissolution rate evaluation and the viscosity evaluation.

8. A method of producing a polyimide, comprising (1) obtaining a polyamic acid using a tetracarboxylic dianhydride and a diamine, (2) obtaining the polyimide by heating the polyamic acid, and (3) evaluating a dissolution rate of the polyimide, wherein, in said evaluating, a Raman spectral intensity I(a) of imide groups contained within the polyimide is measured, wherein I(a) is compared with a Raman spectral intensity I(b) of imide groups contained within a polyimide with a known dissolution rate, wherein the polyimides are obtained using an aromatic tetracarboxylic dianhydride and/or an aromatic diamine, and, wherein an intensity ratio I(a 1 )/I(a 2 ) between a Raman spectral intensity I(a 1 ) of imide groups and a Raman spectral intensity I(a 2 ) of aromatic rings contained within the polyimide is compared with an intensity ratio I(b 1 )/I(b 2 ) between a Raman spectral intensity I(b 1 ) of imide groups and a Raman spectral intensity I(b 2 ) of aromatic rings contained within the polyimide with a known dissolution rate, and reaction control is conducted based on a result of the measurement of the Raman spectral intensity I(a) of imide groups contained within the polyimide.

9. A method of producing a polyimide according to claim 8 , wherein a viscosity of the polyimide is also measured, and reaction control is conducted based on a result of the measurement of the Raman spectral intensity of imide groups and a result of the measurement of viscosity.

10. A method of producing a polyimide according to claim 8 , wherein measurement of the Raman spectral intensity of imide groups contained within the polyimide is conducted on-line or in-line.

11. A polyimide obtained by conducting an evaluation using the method of evaluating a dissolution rate according to claim 1 .

12. A polyimide obtained by a method of producing a polyimide according to claim 8 .

13. A semiconductor device that uses the polyimide according to claim 12 .

14. The method of evaluating a dissolution rate according to claim 1 , wherein said polyimide with a known dissolution rate is a polyimide having the same repeating units as said polyimide whose dissolution rate is being evaluated.

15. The method of evaluating a dissolution rate according to claim 1 , wherein when I(a)>I(b), the dissolution rate of the polyimide being evaluated is slower than that of the polyimide with a known dissolution rate, and wherein when I(a)<I(b), the dissolution rate of the polyimide being evaluated is faster than the dissolution rate of the polyimide with a known dissolution rate.

16. A method of evaluating a dissolution rate of a polyimide by Raman spectroscopy, wherein a Raman spectral intensity I(a) of carboxyl groups within the polyimide is measured, wherein I(a) is compared with a Raman spectral intensity I(b) of carboxyl groups contained within a polyimide with a known dissolution rate, wherein the polyimides are obtained using an aromatic tetracarboxylic dianhydride and/or an aromatic diamine, and, wherein an intensity ratio I(a 1 )/I(a 2 )between a Raman spectral intensity I(a 1 ) carboxyl groups and a Raman spectral intensity I(a 2 ) of aromatic rings contained within the polyimide is compared with an intensity ratio I(b 1 )/I(b 2 ) between a Raman spectral intensity I(b 1 ) of carboxyl groups and a Raman spectral intensity I(b 2 ) of aromatic rings contained within the polyimide with a known dissolution rate.

17. A method of producing a polyimide, comprising (1) obtaining a polyamic acid using a tetracarboxylic dianhydride and a diamine, and (2) obtaining the polyimide by heating the polyamic acid, wherein an evaluation of dissolution rate is made using the method of evaluating a dissolution rate according to claim 16 , and reaction control is conducted based on a result of the evaluation of dissolution rate.

18. A method of producing a polyimide, comprising (1) obtaining a polyamic acid using a tetracarboxylic dianhydride and a diamine, and (2) obtaining the polyimide by heating the polyamic acid, wherein an evaluation of dissolution rate is made using the method of evaluating a dissolution rate according to claim 1 , and reaction control is conducted based on a result of the evaluation of dissolution rate.

19. A polyimide obtained by a method of producing a polyimide according to claim 18 .

20. A method of producing a polyimide according to claim 18 , wherein a viscosity of the polyimide is also measured, and reaction control is conducted based on a result of the measurement of the Raman spectral intensity of imide groups and a result of the measurement of viscosity.

21. A method of producing a polyimide according to claim 18 , wherein measurement of the Raman spectral intensity of imide groups contained within the polyimide is conducted on-line or in-line.

22. A polyimide obtained by conducting an evaluation using the method of evaluating a dissolution rate according to claim 1 .