Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber
Patent
1998-08-25
2000-05-30
Edwards, N.
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Rod, strand, filament or fiber
428364, 264187, D01F 1102, D21B 100
Patent
active
060689196
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention pertains to cellulose fibres obtainable by spinning a solution containing 94-100 wt. % of the constituents cellulose, phosphoric acid and/or its anhydrides, and water.
2. Description of Related Art
Such fibres have been described in non-prepublished patent application WO 96/06208 in the name of the applicant, describing cellulose fibres, filaments, and yarn obtained by spinning an anisotropic cellulose solution prepared by dissolving cellulose in a solvent containing 65-80 wt. % of phosphorus pentoxide.
As disclosed in this application, the fibres, filaments, and yarns which are prepared using the cellulose solution described in the application are especially suitable for specific technical uses, for example, as reinforcing material for rubber articles such as vehicle tires and conveyor belts. The fibres, filaments, and yarns described in WO 96/06208 are characterized by a comparatively high breaking tenacity (>500 mN/tex), a comparatively high modulus (>15 N/tex), and a comparatively low elongation at break (<7%). However, such fibres are less suitable for use in textiles due to, among other things, the relative discomfort that comes with wearing such high-modulus fibres, and particular technical applications due to their comparatively low elongation at break.
SUMMARY OF THE INVENTION
The present invention pertains to cellulose fibres which are more suitable for use in textiles and particular technical applications than the cellulose fibres described in WO 96/06208. The invention pertains to cellulose fibres which have an elongation at break of more than 7%.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
The term phosphoric acid in this patent application refers to all inorganic acids of phosphorus and their mixtures. Orthophosphoric acid is the acid of pentavalent phosphorus, that is H.sub.3 PO.sub.4. Its anhydrous equivalent, that is the anhydride, is phosphorus pentoxide, P.sub.2 O.sub.5. In addition to orthophosphoric acid and phosphorus pentoxide there is, depending on the quantity of water in the system, a series of acids of pentavalent phosphorus with a water-binding capacity in between those of phosphorus pentoxide and orthophosphoric acid, such as polyphosphoric acid, H.sub.6 P.sub.4 O.sub.13, or PPA.
The weight percentage of phosphorus pentoxide in the solvent is calculated by starting from the overall quantity by weight of phosphoric acid including its anhydrides and the total quantity of water in the solvent, converting the acids into phosphorus pentoxide and water, and calculating the percentage of said overall quantity by weight made up by phosphorus pentoxide. In this description water derived from cellulose or from substances which are part of the other constituents and water which is added to obtain the solution are not included in the calculation of the concentration of phosphorus pentoxide in the solvent.
The weight percentage of phosphorus pentoxide in the solution is calculated by starting from the overall quantity by weight of phosphoric acid including its anhydrides and the total quantity of water in the solution, converting the acids into phosphorus pentoxide and water, and calculating which percentage of the overall quantity by weight is made up by phosphorus pentoxide. For that reason in this description water derived from cellulose or from substances which are part of the other constituents and water which is added to obtain the solution are included in the calculation of the concentration of phosphorus pentoxide in the solution.
The weight percentage of cellulose in the solution is calculated by starting from the overall quantity by weight of all constituents in the solution.
Cellulose derivatized with phosphoric acid is included among the constituents making up 94-100 wt. % of the solution to be spun. In the case of cellulose derivatized with phosphoric acid the percentages by weight of cellulose in the solution listed in this patent specification refer to quantities calculated back on the cellu
REFERENCES:
patent: 4725394 (1988-02-01), O'Brien
patent: 4839113 (1989-06-01), Villaine et al.
patent: 5817801 (1998-10-01), Boerstoel et al.
patent: 5856004 (1999-01-01), Maatman et al.
Boerstoel Hanneke
Maatman Hendrik
Veurink Jannes
Westerink Jan Barend
Ypma Marco
Akzo Nobel N.V.
Edwards N.
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