Process for production of polyamide
US9260563B2 · kind B2 · utility
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10Claims
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Key dates
| Filing date | Nov 24, 2010 |
| Grant date | Feb 16, 2016 |
| Priority date | — |
| Expiry date | Aug 22, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G69/28
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An economical batchwise production method of polyamide with good quality by the polycondensation in which a diamine component including 70 mol % or more of a xylylenediamine which includes 20 mol % or more of p-xylylenediamine is added to a dicarboxylic acid component in a batchwise reaction tank equipped with a partial condenser. The diamine component is added while maintaining the whole reaction system in fluid state under pressure. The pressure is reduced during the time that the molar ratio is within a specific range while continuing the addition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.