Liquid crystal solutions having a base of cellulose and at least one phosphoric acid
US5938971A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 18, 1997 |
| Grant date | Aug 17, 1999 |
| Priority date | — |
| Expiry date | Mar 18, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2965
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Liquid-crystal solutions comprising cellulose dissolved in a solvent agent. They contain more than 10% by weight of cellulose, and are optically anisotropic at rest and at room temperature. The solvent agent contains more than 85% by weight of at least one phosphoric acid, this phosphoric acid or all of these phosphoric acids having the following average formula : EQU n(P.sub.2 O.sub.5), p(H.sub.2 O)!, PA1 with 0.33<(n/p)<1.0. A method of obtaining such solutions. Production of fibers or films from these solutions. Assemblages of such fibers of films. Articles reinforced by such fibers or films or assemblages, said articles being in particular tire casings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.