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AssigneeNippon Telegraph and Telephone Corporation
InventorsAzusa Ishii, Takashi Miwa, Masamitsu Watanabe, Soichi Oka
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In a first step, a sample formed of a polyester or decomposition products of a polyester is dissolved in a pretreatment liquid containing a secondary amine to obtain a reaction product (amide) of the sample. In a second step, the obtained reaction product, amide, is mixed into a solvent containing deuterated chloroform and deuterated 1,1,1,3,3,3-hexafluoro-2-propanol to fabricate a sample liquid. In a third step, the amount of the amide in the sample liquid is measured through a nuclear magnetic resonance spectroscopy aiming at hydrogen atoms to determine the amount of acid anhydride in the sample.
1-6. (canceled)
A method for measuring an acid anhydride content, the method comprising:
The method according to claim ii, wherein, in the first step, the sample is dissolved in the pretreatment liquid to obtain the reaction product by setting a temperature of the pretreatment liquid at 30° C. or higher and at or below a boiling point of a component with a lowest boiling point contained in the pretreatment liquid.
A method for measuring an acid anhydride content, the method comprising:
A method for measuring an acid anhydride content, the method comprising:
Dependencies are inferred from the claim text.