Optically anisotropic spinning solution comprising a mixture of P-aramid and aliphatic polyamide, and fibers to be made therefrom
US5962627A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 1997 |
| Grant date | Oct 5, 1999 |
| Priority date | — |
| Expiry date | Apr 22, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31725
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
It has been found that fibers which incorporate very good mechanical properties as well as very good adhesive properties can be made from an optically anisotropic spinning solution containing a mixture of a paraphenylene groups-containing, wholly aromatic polyamide component and another polyamide component if for the para-aromatic polyamide component full or partial use is made of copolymer in which 2,6-naphthylene units are present in addition to the paraphenylene units and the other polyamide component is an aliphatic polyamide. Preferably, the weight ratio of the para-aromatic polyamide component to the aliphatic polyamide component is 95:5 to 85:15. The aromatic copolyamide containing paraphenylene and 2,6-naphthylene is preferably obtained by polymerising paraphenylene diamine (PPD) and a stoichiometric amount of a mixture composed of terephthalic acid dichloride (TDC) and 2,6-naphthylene carboxylic acid dichloride (NDC) in a molar ratio TDC:NDC of 99:1 to 80:20.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.