Aromatic polyamide pulp and its preparing process
US5767228A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 4, 1996 |
| Grant date | Jun 16, 1998 |
| Priority date | — |
| Expiry date | Oct 4, 2016 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H13/26
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to an aromatic polyamide pulp and its preparing process which has both excellent physical properties and high degree of polymerization wherein aromatic diamine is reacted with aromatic diacid chloride in amides and/or urea-based polymerization solvent containing inorganic salts and/or a little of Lewis acid compound. The present invention can easily provide the pulp of high polymerization degree and high orientation by stirrer in the continuous transferable polymerization-orientation-gelation apparatus within a short time without use of a tertiary amine affecting human body and without regard to isotropic or anisotropic, and continuous or uncontinuous ejection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.