Rhone-poulenc-textile

Henry Rodier

Jacques Menault

Pierre Chion

Jean-Paul Sacre

The present invention relates to new polymer solutions which make it possible to obtain shaped articles such as yarns and fibres, films, sheets and the like. These solutions consist of cellulose having a degree of polymerization of at least 200, polyvinyl chloride, dimethyl sulphoxide and formaldehyde, the weight ratio cellulose/polyvinyl chloride being 0.05 to 0.5, preferably 0.1 to 0.5, the ratio formaldehyde/cellulose being 0.2 to 2 and the total polymer concentration being 6 to 20%, preferably 10 to 18%. Such solutions are particularly suitable for the manufacture of filaments consisting of fibrils substantially orientated along the axis of the fibre and closely interlaced, the cellulose macromolecules being partially involved in a crystal lattice characteristic of cellulose II. The filaments possess valuable properties for textile use.

Solutions, which can be shaped, from mixtures of cellulose and polyvinyl

New polymer solutions, processes for producing such solutions, shaped articles made from these solutions, and process of making such articles, are disclosed. The polymer solutions contain cellulose having a degree of polymerization of at least 200, an acrylonitrile polymer, dimethylsulphoxide and formaldehyde. The weight ratio of cellulose/acrylonitrile polymer is 0.05 to 1, preferably 0.1 to 1, the weight ratio of formaldehyde/cellulose is 0.2 to 2, and the total concentration of polymer in the solution is 12 to 30% by weight, preferably 18 to 26% by weight. The solutions of the present invention are particularly suitable for the production of filaments consisting of fibrils orientated approximately along the axis of the fibre and closely interwoven, with the cellulose macromolecules being partially involved in a crystal lattice characteristic of cellulose II. The filaments possess valuable properties for use in textiles, such as, for instance, in garments.

Cellulose-acrylonitrile polymer solutions, articles, and methods of

New polymer solutions, processes for producing such solutions, shaped articles made from these solutions, and process of making such articles, are disclosed. The polymer solutions contain cellulose having a degree of polymerization of at least 200, an acrylonitrile polymer, dimethylsulphoxide and formaldehyde. The weight ratio of cellulose/acrylonitrile polymer is 0.05 to 1, preferably 0.1 to 1, the weight ratio of formaldehyde/cellulose is 0.2 to 2, and the total concentration of polymer in the solution is 12 to 30% by weight, preferably 18 to 26% by weight. The solutions of the present invention are particularly suitable for the production of filaments consisting of fibrils orientated approximately along the axis of the fibre and closely interwoven, with the cellulose macromolecules being partially involved in a crystal lattice characteristics of cellulose II. The filaments possess valuable properties for use in textiles, such as, for instance, in garments.

Cellulose-polyacrylonitrile-DMSO-formaldehyde solutions, articles, and

The present invention relates to new polymer solutions which make it possible to produce shaped articles, such as yarns and fibres, films, sheets and the like. These solutions consist of cellulose having a degree of polymerisation of at least 200, polyamide-imide, dimethyl sulphoxide and formaldehyde, with a weight ratio cellulose/polyamide-imide of 0.05 to 1, preferably 0.1 to 1, a ratio formaldehyde/cellulose of 0.2 to 2 and a total concentration of 6 to 25%, preferably 15 to 20%. These solutions are particularly suitable for the production of filaments which consist of fibrils substantially orientated along the axis of the fibre and closely intersecting, the cellulose macromolecules being partially involved in a crystal lattice characteristic of cellulose II. The filaments possess valuable properties for use in textiles.

Solutions, which can be shaped, from mixtures of cellulose and

A process for producing shaped articles of cellulose is disclosed, wherein a solution of cellulose in dimethylsulphoxide (DMS0) and formaldehyde, at a formaldehyde/cellulose weight ratio of 0.2 to 2, and at a cellulose concentration of at least 6% by weight based on the volume of DMSO, is spun into a coagulant bath. The coagulant bath contains water, DMSO and ammonia or an ammonium salt, with the DMSO present in an amount of about 25 to 60 weight percent of the mixture of DMSO and water. The ammonia or ammonium salt is present in an amount, calculated as ammonia, of at least 1 gram per liter in the mixture of DMSO and water. The use of the coagulant bath of the present invention permits the cellulosic solution to be formed into shaped articles, and especially into filaments which are useful in the textile field. Other shaped articles which can be made from the cellulosic solution include fibers, threads, membranes, films, and sheets.

Process for producing cellulosic shaped articles

A process for producing shaped articles of cellulose is disclosed, wherein a solution of cellulose in dimethylsulphoxide (DMSO) and formaldehyde, at a formaldehyde/cellulose weight ratio of 0.2 to 2, and at a cellulose concentration of at least 6% by weight, based on the volume of DMSO, is spun into a gaseous atmosphere containing ammonia. The process of the present invention permits the cellulosic solution to be formed into shaped articles in a very rapid and economical manner. The invention is especially useful in the production of filaments which can be used in the textile field, but other shaped articles, such as fibers, threads, films and sheets, can also be made from the cellulosic solution.

Cellulose fiber process

A process for producing shaped articles of cellulose is disclosed, wherein the process includes steps of contacting a shaped solution of cellulose in DMSO and formaldehyde, containing at least 6% by weight of cellulose based on the volume of DMSO, and containing formaldehyde in a weight ratio of formaldehyde/cellulose of about 0.2 to about 0.6, with a coagulating solution of DMSO and water at a temperature no greater than 10.degree. C. The coagulant bath generally contains 30 to 50% by weight of DMSO, and the solutions are readily coagulated at coagulation speeds appropriate for commercial practice, and generally the coagulation occurs in less than 20 seconds. The products produced by the present process are shaped articles such as filaments, fibers, films, sheets and membranes, and especially filaments which are suitable for use in the textile field.

Process for producing shaped articles of cellulose

Spinnable, shapable solutions of celluose are disclosed, wherein the solutions contain native cellulose in a mixture of dimethylsulphoxide (DMSO) and formaldehyde. The cellulose has a degree of polymerization (DP) of at least 400 and a concentration in the mixture of at least 6% by weight, based on the volume of DSMO. The formaldehyde/cellulose weight ratio is 0.2 to 2, and the solutions have a water content no greater than 5,000 ppm by weight. The solutions are obtained by dissolving the cellulose in a mixture of DMSO and formaldehyde, at a formaldehyde/cellulose weight ratio of at least 1, and thereafter the formaldehyde/cellulose weight ratio is reduced, if necessary, to the final level of about 0.2 to 2. The solutions can be converted into films, membranes, sponges, varnishes, paints, and especially into filaments, with the filaments being generally similar in properties to regenerated cellulose filaments.

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Sainte Foy Les Lyon, France

Henry Rodier