METHOD FOR MEASURING TEREPHTHALIC ACID CONTENT AND SOLVENT FOR USE IN MEASUREMENT

Title:

METHOD FOR MEASURING TEREPHTHALIC ACID CONTENT AND SOLVENT FOR USE IN MEASUREMENT

Document Type and Number:

WIPO Patent Application WO/2019/225356

Kind Code:

A1

Abstract:

In this method for measuring terephthalic acid content, a sample liquid in which a solvent is mixed with a sample comprising a polyester or a polyester degradation product is prepared in a first step S101. The solvent used comprises 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. The amount of terephthalic acid in the sample solution is measured by nuclear magnetic resonance spectroscopy for hydrogen atoms in a second step S102.

Inventors:

ISHII AZUSA (JP)
MIWA TAKASHI (JP)

Application Number:

PCT/JP2019/018734

Publication Date:

November 28, 2019

Filing Date:

May 10, 2019

Export Citation:

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Assignee:

NIPPON TELEGRAPH & TELEPHONE (JP)

International Classes:

G01N24/08

Foreign References:

JP2017219517A	2017-12-14
JP2001201471A	2001-07-27
JP2006045513A	2006-02-16
JP2008224284A	2008-09-25
JP2001126534A	2001-05-11

Other References:

A.W.BIRLEY ET AL.: "Unsaturated polyesters based on terephthalic acid: 2.Quantitative characterization of prepolymers by proton magnetic resonance spectroscopy", POLYMER, vol. 19, 1978, pages 1433 - 1436, XP025889092, DOI: 10.1016/0032-3861(78)90096-4
C JACKSON ET AL.: "Size Exclusion Chromatographic Mobile Phase Optimization for Nylon Using Online Light Scattering and Viscometry Detectors", POLYMERIC MATERIALS SCIENCE AND ENGINEERING, vol. 69, 1993, pages 270 - 271

Attorney, Agent or Firm:

YAMAKAWA, Shigeki et al. (JP)

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