Patent ID: 7973125

Claim:
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.