Method for measuring acid anhydride content
US11782003B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 13, 2019 |
| Grant date | Oct 10, 2023 |
| Priority date | — |
| Expiry date | Dec 7, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N24/08
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a first step, a sample formed of a polyester or decomposition products of a polyester is dissolved in a pretreatment liquid containing 1,1,1,3,3,3-hexafluoro-2-propanol and an organic base to produce a reaction product of the sample, and in a second step, the obtained reaction product is mixed into a solvent (measurement solvent) containing deuterated chloroform and deuterated 1,1,1,3,3,3-hexafluoro-2-propanol to fabricate a sample liquid. Next, in a third step, the amount of the reaction product in the sample liquid is measured through NMR aiming at hydrogen atoms to determine the amount of an acid anhydride structure in the sample.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.