Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1998-08-14
2000-10-24
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
2642111, 26421111, 26421114, 264233, D01D 518, D01F 202
Patent
active
061362441
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention pertains to a process for preparing cellulose fibres and filaments from a spinnable solution containing cellulose, the solution being spun using a centrifuge, the centrifuge having at least one spinning orifice, in which process the spinning solution after leaving the centrifuge is coagulated in a liquid, which liquid is enclosed in a jacket.
2. Description of Related Art
Such a process has been described in non-prepublished Netherlands international patent application WO 96/27700 in the name of Applicant.
As described in this application, various spinning solutions can be spun with the aid of a centrifuge. As compared with well-known wet spinning processes, such as the dry jet-wet spinning process, fibres and filaments can be made at a higher output rate when a centrifuge is used. Also, fibres/filaments can be made which possess superior properties for particular end uses, such as pulp.
Furthermore, compared with the known spinning processes, a spinning process using a centrifuge is not susceptible to filamentation while the spinning solution requires less fine filtration.
SUMMARY OF THE INVENTION
The invention pertains to the solution which is used to make cellulose fibres and filaments with the aid of a centrifuge. It was found that using this solution, which can be prepared very easily, makes it possible to produce cellulose fibres and filaments with very favourable properties, rendering these products highly suitable for use in textile as well as technical applications.
The invention consists in that in the process as described WO 96/27700 use is made of a solution containing 94-100 wt. % of the constituents:
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
Cellulose solutions which can be used, e.g. for example, in the process according to the present invention are isotropic and anisotropic solutions containing 94-100 wt. % of the constituents cellulose, phosphoric acid and/or its anhydrides, and water. Such anisotropic solutions are described in non-prepublished patent application WO 96/06208, isotropic solutions are described in non-prepublished patent application NL 1002236, both applications in the name of the Applicant.
Cellulose-containing spinnable solutions which are used in the process according to the present invention are obtainable by dissolving cellulose in a solvent containing 65-80 wt. % of phosphorus pentoxide.
Spinnable solutions are solutions suitable for conversion into fibres or filaments by means of extrusion, coagulation, and winding.
In the case of cellulose derivatised with phosphoric acid, the percentages by weight of cellulose in the solution listed in this patent specification refer to quantities calculated back on the cellulose. This applies in analogous fashion to the quantities of phosphorus mentioned in this specification.
Cellulose derivatized with phosphoric acid is included among the constituents making up 94-100 wt. % of the solution.
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, PPA).
In the present patent specification the solvent by definition is made up of the added phosphoric acid and/or its anhydrides and all the free water present in the solution. For that reason this description always includes in the solvent the water originating from the cellulose, which is usually added at a later time, while water from substances which are among the remaining constituents also is part of the solvent.
The phosphorus content of the solvent is determi
REFERENCES:
patent: 5401447 (1995-03-01), Matsui et al.
Rusticus Sven Jorgen
Van Andel Eleonoor
Akzo Nobel N.V.
Tentoni Leo B.
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