Process for making a spun article from cellulose material
US6756001B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 13, 2002 |
| Grant date | Jun 29, 2004 |
| Priority date | — |
| Expiry date | Aug 14, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2965
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The invention concerns a coagulating agent for liquid crystal solutions with a base of cellulose substances, characterised in that it contains at least one water soluble additive selected from the group consisting of ammonia, amines of salt of these compounds, the additive being such that the pH of the said coagulating agent is greater than 6. A preferable additive is a salt elected from the group consisting of ammonium formates, acetates and phosphates, mixed salts of these compounds, or mixtures of these constituents, in particular diammonium orthophosphates (NH4)2HPO4. The invention also concerns a method for spinning a liquid crystal solution with a base of cellulose substances, using a coagulating agent as per the invention, in particular the method called the “dry-jet-wet-spinning” as well as spun articles, fibers or films, obtained by these methods. The invention further concerns a cellulose fiber having toughness higher than 40 cN/tex, an initial modulus of elasticity higher than 1200 cN/tex and high fatigue strength: its breaking load degeneration &Dgr;F after 350 fatigue cycles in the so-called “specimen test”, under a compression rate of 3.5% and …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.