Method for measuring terephthalic acid content and solvent for use in measurement
US11867647B2 · kind B2 · utility
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Key dates
| Filing date | May 10, 2019 |
| Grant date | Jan 9, 2024 |
| Priority date | — |
| Expiry date | Feb 25, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N24/08
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a first step, a sample liquid is fabricated by mixing a sample formed of a polyester or decomposition products of a polyester into a solvent. The solvent used here contains chloroform and 2,2,2-trifluoroethanol and has an organic base added thereto. The organic base is at least one of a primary amine, a secondary amine, a tertiary amine and a heterocyclic amine. In a second step, the amount of terephthalic acid in the sample liquid is measured through a nuclear magnetic resonance spectroscopy aiming at hydrogen atoms
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.