Liquid-crystalline polyester production method
US7005497B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 14, 2004 |
| Grant date | Feb 28, 2006 |
| Priority date | — |
| Expiry date | Sep 14, 2024 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/605
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A liquid-crystalline polyester production method with a shortened reaction time and improved productivity per unit time by using an organic basic compound containing one nitrogen atom in a molecule is achieved by a liquid-crystalline polyester production method comprising carrying out acylation reaction and/or ester-exchange in the presence of an organic basic compound containing one nitrogen atom in one molecule and satisfying the following inequality (1):0<A+0.4×B (1)wherein, A and B satisfy A={(Ech+−Ec)/(Eph+−Ep)}−1 and B=(φf/φfp)−1;Ec denotes the heat of formation of the organic basic compound; Ech+ denotes the heat of formation of a compound coordinated by proton; Ep denotes the heat of formation of pyridine; and Eph+ denotes the heat of formation of pyridine coordinated by proton to the nitrogen atom; φf and φfp independently denote parameters relevant to the steric angles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.