WO2023120697A1 - 再生セルロース繊維、その製造方法、及びその繊維構造物 - Google Patents
再生セルロース繊維、その製造方法、及びその繊維構造物 Download PDFInfo
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- WO2023120697A1 WO2023120697A1 PCT/JP2022/047585 JP2022047585W WO2023120697A1 WO 2023120697 A1 WO2023120697 A1 WO 2023120697A1 JP 2022047585 W JP2022047585 W JP 2022047585W WO 2023120697 A1 WO2023120697 A1 WO 2023120697A1
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- eggshell membrane
- fiber
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
- D01F2/06—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from viscose
- D01F2/08—Composition of the spinning solution or the bath
- D01F2/10—Addition to the spinning solution or spinning bath of substances which exert their effect equally well in either
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/06—Wet spinning methods
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
- D01F2/06—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from viscose
Definitions
- the present invention relates to a regenerated cellulose fiber containing an eggshell membrane hydrolyzate, and more particularly to a regenerated cellulose fiber containing eggshell membrane components obtained by applying the eggshell membrane hydrolyzate to a regenerated cellulose fiber manufacturing process and a method for manufacturing the same.
- Eggshell membrane is the thin skin inside the eggshell, and cosmetics and wounds that take advantage of its properties such as cell-producing action of amino acids, adhesion to tissues due to its network structure, and moderate moisture retention and air permeability possessed by eggshell membrane. It has been known for a long time that it is effective as a coating material. However, eggshell membranes are insoluble in most solvents including water, and are difficult to form into fibers. Therefore, a hydrolysis treatment is performed to solubilize the eggshell membrane, and it is used as a water-soluble eggshell membrane component.
- the former first, as a method of incorporating fine particles of binchotan charcoal or chitosan for the purpose of imparting deodorant and antibacterial functions, for example, cellulose is converted to alkali cellulose, and then cellulose xan is reacted with carbon disulfide.
- a so-called kneading method in which the tate is dispersed in a spinning dope such as viscose obtained by dissolving the tate and spun.
- the particle size of the fine particles to be added must be limited in order to prevent yarn breakage and clogging of the spinneret. becomes.
- the present inventors have found that functional fibers can be obtained by using hydrolyzed eggshell membranes, which are highly safe and have biocompatibility (skin protection), in order to impart novel functions to regenerated cellulose fibers. I found what I can do. Accordingly, the present invention provides regenerated cellulose fibers containing hydrolyzed eggshell membranes.
- a regenerated cellulose fiber comprising an eggshell membrane hydrolyzate.
- the fiber according to any one of the preceding items, wherein the eggshell membrane hydrolyzate has a weight average molecular weight of about 10,000 to about 100,000.
- a method for producing regenerated cellulose fibers containing hydrolyzed eggshell membranes comprising: a step of hydrolyzing the eggshell membrane; a step of stopping the hydrolysis to obtain a solution containing an eggshell membrane hydrolyzate; a step of mixing a cellulose-containing spinning dope with a solution containing the eggshell membrane hydrolyzate to obtain an eggshell membrane hydrolyzate-containing spinning dope; coagulating and regenerating cellulose from the eggshell membrane hydrolyzate-containing spinning dope to produce regenerated cellulose fibers.
- (Item 7) A method according to any one of the preceding items, wherein said hydrolysis is carried out in an alkaline solution with an alkaline concentration of about 0.1 to about 10% (w/w).
- (Item 8) A method according to any one of the preceding items, wherein the hydrolysis is terminated by reaction with carbon disulfide and/or neutralization with an organic carboxylic acid.
- (Item 9) A method according to any one of the preceding items, wherein said termination is carried out with about 0.5 to about 1.0 equivalents of said organic carboxylic acid relative to the alkali used for hydrolysis.
- (Item 10) A method according to any one of the preceding items, wherein the organic carboxylic acid is citric acid.
- (Item 11) A fiber produced by the method according to any one of the above items.
- (Item 12) A fibrous structure comprising the fiber according to any one of the above items or the fiber produced by the method according to any one of the above items.
- the regenerated cellulose fiber of the present invention contains an eggshell membrane hydrolyzate with a molecular weight that exhibits the properties of eggshell membranes and a high cystine content.
- the regenerated cellulose fiber of the present invention can be produced by applying the conventional manufacturing process of regenerated cellulose fiber as it is. Manufacturing is possible.
- the regenerated cellulose fiber and its fiber structure of the present invention have the properties of eggshell membrane in addition to the properties of the original regenerated cellulose fiber, so they have functionality such as moisture absorption and release properties, deodorizing properties, and antibacterial properties.
- the regenerated cellulose fiber of the present invention has no restrictions on the shape and area of the fiber structure, only the area corresponding to the size of the egg can be collected, and the shape is not flat. You can also
- FIG. 1 is a photograph showing fibers kneaded with an eggshell membrane component according to one embodiment of the present invention.
- FIG. 2 is a photograph showing fibers (regular fibers) in which eggshell membrane components are not kneaded.
- regenerable cellulose fiber refers to a natural cellulose derived from wood or non-wood as a raw material, dissolved in a special solvent, reacted with a complexing agent, or solubilized by chemical modification to form a derivative. It refers to fibers obtained by regenerating fibrous cellulose by spinning in a spinning bath a spinning dope obtained by dissolving cellulose.
- regenerated cellulose fibers include, for example, rayon obtained by the viscose method (also referred to as viscose rayon), polynosic, cupra obtained by the cuprammonium method, and solvent-spun cellulose obtained by the solvent spinning method (also referred to as lyocell). and so on.
- the term “molecular weight” or “average molecular weight” refers to polyethylene oxide (PEO) conversion measured by gel permeation chromatography (GPC method) after dissolving the eggshell membrane hydrolyzate in a solvent. shows the weight average molecular weight (Mw) at .
- regenerated cellulose fibers comprising eggshell membrane hydrolyzate are provided.
- the origin of the eggshell membrane which is the material for the regenerated cellulose fiber of the present invention, is not particularly limited.
- poultry and bird eggshell membranes such as chicken, quail, turkey, duck, duck, goose, ostrich, guinea fowl, onagari, bantam, pigeon, mute swan, emu, or pheasant can be used.
- chickens are preferred because they are easily available, are prolific as an egg-laying species, produce large eggs, and are well-established for mass breeding.
- the eggshell membrane has eggshells attached to it, and if it is hydrolyzed in this state, the eggshells remain insoluble, clogging the spinneret during wet spinning and causing damage to the spinneret, which is not preferable.
- the eggshell membrane containing the eggshell may be immersed in an aqueous solution of hydrochloric acid, phosphoric acid, etc., the eggshell dissolved in water, filtered and washed with water to remove in advance, or the After hydrolyzing the raw eggshell membranes to make them soluble in the solvent, the solvent-insoluble eggshells may be physically removed by filtration, centrifugation, or the like.
- the eggshell membranes are preferably pulverized in advance for smooth hydrolysis of the eggshell membranes.
- the size is not particularly limited.
- the crushed eggshell membrane preferably has a diameter of about 0.1 ⁇ m or more and about 5 mm or less, more preferably about 1 ⁇ m or more and about 1 mm or less.
- the eggshell membrane of the present invention can be hydrolyzed and used for fiber production.
- hydrolysis of eggshell membranes it is known that solubilized eggshell membranes having a relatively large molecular weight can be obtained by hydrolyzing at a high temperature in the presence of an alkali (Japanese Patent No. 6288686).
- Hydrolysis in the presence of alkali requires a step of neutralization with an acidic substance in order to stop the decomposition reaction, and there is a problem that the neutralization step reduces the cystine content, which is a feature of eggshell membranes.
- an eggshell membrane hydrolyzate with a high cystine content can be obtained by allowing a proteolytic enzyme having an optimum pH in the alkaline region to act (Japanese Patent Application Laid-Open No. 2018-177713). It is difficult to obtain a solubilized eggshell membrane protein having a large molecular weight as described above, and the protease itself, which is a catalyst, is expensive, resulting in high production costs.
- eggshell membranes can be dissolved in thiopropionic acid or the like and spun by an electrospinning method to provide a fiber assembly (Japanese Patent Application Laid-Open No. 2009-89859, Patent No. 5166953). Not only does the manufacturing method require a special device, but the fiber aggregate does not have a natural eggshell membrane structure because the eggshell membrane component itself is used as a fiber. It is enough.
- the eggshell membrane hydrolysis treatment hydrolyzes the eggshell membrane so that it can become the regenerated cellulose fiber of the present invention.
- the resulting hydrolyzate has a weight average molecular weight (Mw) of about 10,000 to about 100,000, preferably about 15,000 by GPC (gel permeation chromatography). 000 to about 80,000, more preferably about 30,000 to about 60,000.
- Mw weight average molecular weight
- the eggshell membrane hydrolysis treatment in the present invention is such that the cystine and cysteine content in the eggshell membrane components in the resulting hydrolyzate is about 5% or more, about 8% or more, about 10% or more, about 12% or more.
- the hydrolysis treatment of eggshell membranes includes acids (hydrochloric acid, sulfuric acid, etc.), alkalis (sodium hydroxide, potassium hydroxide, etc.), proteolytic enzymes (enzymes of microbial origin, enzymes of plant origin, enzymes of animal origin), etc. However, it is preferably carried out with an alkali, more preferably in an alkaline aqueous solution.
- the hydrolyzed eggshell membrane which is the material for the regenerated cellulose fiber of the present invention, may be a hydrolyzate with sodium hydroxide, an alkali metal such as lithium hydroxide and potassium hydroxide, or an alkaline earth such as calcium hydroxide.
- a metal aqueous solution or the like can also be used. Since peptide bonds that constitute proteins are extremely stable bonds, they can be decomposed non-enzymatically using alkali, so they can be decomposed by heating at high pH and high temperature, and relatively weakly alkaline alkali is used. In some cases, it can be treated at high temperature for a long time.
- eggshell membranes can be hydrolyzed using proteolytic enzymes such as pepsin, trypsin, renin, papain, caspase, chymotrypsin, protease, and peptidase, and acids such as citric acid, hydrochloric acid, and sulfuric acid.
- proteolytic enzymes such as pepsin, trypsin, renin, papain, caspase, chymotrypsin, protease, and peptidase
- acids such as citric acid, hydrochloric acid, and sulfuric acid.
- an eggshell membrane in the case of hydrolysis with an alkali such as sodium hydroxide, is prepared as a raw material, and an alkali is added to the eggshell membrane and stirred.
- the stirring conditions at this time may be such that the raw material and the alkali are sufficiently stirred and the alkali hydrolyzes the peptide bonds in the raw material to appropriately obtain the hydrolyzed eggshell membranes of the present invention.
- the alkali concentration is preferably about 0.1 to about 20%, more preferably about 0.5 to about 10%. If it is less than about 0.1%, a sufficient hydrolyzate cannot be obtained, and if it is more than about 20%, the hydrolysis rate is too fast and it is difficult to control the degree of hydrolysis, which is not preferable.
- the hydrolysis temperature is preferably about 10 to about 90°C, more preferably about 40 to about 80°C. If the temperature is less than about 10°C, hydrolysis hardly progresses, and if it is about 90°C or more, it is difficult to control the degree of hydrolysis, which is not preferable.
- the reaction time when the eggshell membranes are treated with alkali can be appropriately changed depending on the reaction temperature, alkali concentration, target molecular weight, etc., as long as the eggshell membranes are adequately hydrolyzed. It is not particularly limited.
- the reaction time can be from about 30 minutes to about 6 hours, preferably from about 1 hour to about 4 hours.
- the solvent required for hydrolysis is preferably water, but water-soluble organic solvents such as methanol, ethanol, acetone, n-propanol, isopropanol, etc. may be used in combination. Hydrolysis with an aqueous solvent is preferred from the viewpoint of work environment and waste water treatment.
- the hydrolysis reaction in the present invention is performed at a timing when the resulting hydrolyzate has a weight average molecular weight (Mw) of about 10,000 to about 100,000, preferably about 15,000 to about 80,000. More preferably, it is stopped at a timing of about 30,000 to about 60,000.
- Mw weight average molecular weight
- the hydrolysis reaction can be accomplished by any means in the art. In a preferred embodiment, there are two methods for stopping the hydrolysis of eggshell membranes, and either method may be used.
- the acid to be introduced may be either a strong acid or a weak acid, but in the case of a strong acid such as hydrochloric acid or sulfuric acid, hydrolyzed eggshell membranes are precipitated at the stage of adding about 0.5 equivalent of the acid.
- a strong acid such as hydrochloric acid or sulfuric acid
- hydrolyzed eggshell membranes are precipitated at the stage of adding about 0.5 equivalent of the acid.
- it is preferably a weak acid because it produces a strong sulfur smell and drops cystine and/or cysteine.
- the weak acid may include an acid exhibiting an acid dissociation constant (pKa) in water of 0 or more, preferably about 0.2 or more, more preferably about 1.0 or more. , more preferably about 1.5 or more, more preferably about 2.0 or more, still more preferably about 3.0 or more, and the upper limit is not particularly set.
- pKa acid dissociation constant
- acetic acid pKa 4.6
- carbonic acid pKa 6.4
- oxalic acid pKa 1.0
- citric acid pKa 3.1
- the organic carboxylic acid used in the present invention is not particularly limited, but is preferably a weak acid such as citric acid, since hydrolyzed eggshell membranes do not precipitate as an insoluble matter in an amount up to equivalent neutralization.
- the amount of organic carboxylic acid used for neutralization is about 0.5 to about 1.0 equivalents of acid, more preferably about 0.6 to about 0.8 equivalents, relative to the alkali agent used. If the amount is less than about 0.5 equivalents, hydrolysis proceeds over time, and if the amount is about 1.0 equivalents or more, the hydrolyzed eggshell membrane components are precipitated, which is not preferable.
- the organic carboxylic acid is not particularly limited as long as it can neutralize hydrolysis, but preferably includes weak acids such as citric acid, acetic acid, carbonic acid, or oxalic acid. Acids are preferred because they are used in applications such as textiles and cosmetics.
- either one of terminating the hydrolysis with carbon disulfide as described above and neutralizing the hydrolysis with an organic carboxylic acid such as citric acid may be performed, or both may be used together to stop or neutralize hydrolysis.
- the eggshell membrane hydrolyzate obtained as described above has a weight average molecular weight (Mw) determined by GPC (gel permeation chromatography) of about 10,000 to about 100,000, preferably about 15,000 to about 80. ,000, more preferably from about 30,000 to about 60,000.
- Mw weight average molecular weight
- the solubility in water increases when spinning into rayon fibers, resulting in a low residual rate. It is not preferable because the residual rate of
- the eggshell membrane hydrolyzate of the present invention has a molecular weight of about It can be maintained within 30%, within about 20%, preferably within about 15%, more preferably within about 10%, and even more preferably within about 5%.
- Regenerated cellulose fibers are obtained by dissolving natural cellulose derived from wood or non-wood as a raw material, dissolving the cellulose in a special solvent, reacting with a complexing agent, or forming a derivative by chemical modification. It is a fiber obtained by spinning a spinning dope in a spinning bath and regenerating it into fibrous cellulose. It has been popular for a long time as an artificial fiber with properties similar to those of natural fibers, such as excellent hygroscopicity. Regenerated cellulose fibers are fibers similar to cotton, and although they are a substitute for natural fibers, various attempts have been made to impart new properties to them.
- cationic substances such as quaternary ammonium compounds (JP-A-52-91913) or casein (Cisalpha, Lacisana), soybeans, albumin, fibroin (JP-B-38-18563).
- JP-A-9-241920) and a wool solution JP-A-9-241920 have been proposed.
- these methods have problems in compatibility with viscose, have manufacturing defects in spinning, and are poor in marketability.
- a strong alkaline solution (pH 13 or higher) is used to disperse protein, and the reaction is carried out at a high temperature of 50°C or higher. Then, the reaction product is obtained as a viscous resin. Furthermore, the yield is expressed as the above resin content, and the amount of protein remaining in the resin is unknown.
- the eggshell membrane component is kneaded into the regenerated cellulose fiber by a manufacturing method that does not require a special device and can be handled by the current manufacturing process, and the fiber and the eggshell membrane exhibit excellent functions.
- a method for producing the same is provided.
- the regenerated cellulose fiber of the present invention is a regenerated cellulose fiber containing an eggshell membrane hydrolyzate, wherein about 0.5 parts by mass or more of the eggshell membrane hydrolyzate is added to about 100 parts by mass of cellulose. up to about 25 parts by weight.
- the regenerated cellulose fiber of the present invention is a method for producing a regenerated cellulose fiber containing hydrolyzed eggshell membranes, comprising a step of hydrolyzing the eggshell membranes, and stopping the hydrolysis to hydrolyze the eggshell membranes. mixing a spinning dope containing cellulose with a solution containing the eggshell membrane hydrolyzate to obtain a spinning dope containing the eggshell membrane hydrolyzate; coagulating and regenerating cellulose from the spinning dope contained to produce regenerated cellulose fibers.
- the method for producing a regenerated cellulose fiber of the present invention includes, for example, a cuprammonium method in which a spinning stock solution obtained by solubilizing cellulose by forming a cuprammonium complex is spun;
- the viscose method in which the spinning dope (viscose) obtained by solubilizing cellulose xanthate by reacting carbon sulfide is spun, and the solvent spinning, in which the spinning dope obtained by dissolving cellulose in a special solvent is spun. law, etc.
- viscose rayon fibers obtained by the viscose method are particularly useful.
- the step of hydrolyzing eggshell membranes in the presence of an alkali the step of stopping the hydrolysis to obtain a solution containing an eggshell membrane hydrolyzate, the viscose stock solution containing cellulose, A step of mixing the solution containing the eggshell membrane hydrolyzate to prepare a viscose solution; and a step of extruding the viscose solution from a spinning nozzle into a spinning bath to coagulate and regenerate cellulose to produce rayon.
- eggshell membrane component-containing viscose rayon fibers produced by the viscose method can be obtained through the following steps. (1) Step of hydrolyzing eggshell membranes in the presence of an alkali and then adding carbon disulfide to stop the hydrolysis (2) Hydrolyzing the eggshell membranes in the presence of an alkali and then neutralizing with an organic carboxylic acid for hydrolysis. step (3) of stopping the step (4) (3) of blending the eggshell membrane hydrolyzate obtained through the step of (1) or (2) with the viscose spinning stock solution to obtain a viscose rayon fiber by a wet spinning method; ) Process of processing the viscose rayon fiber obtained through the process of ) into staple
- the fiber of the present invention has functionality, and since eggshell membrane is a natural material for the fiber, it is preferably a fiber derived from a natural product, particularly a regenerated cellulose fiber.
- Viscose rayon fibers are preferred.
- the viscose rayon fiber is a step of obtaining cellulose xanthate by converting natural cellulose derived from wood or non-wood into alkali cellulose and then reacting carbon disulfide to obtain cellulose xanthate. It is manufactured by a step of obtaining viscose and a step of spinning the viscose to obtain regenerated cellulose fibers.
- the carbon disulfide-terminated eggshell membrane hydrolyzate is mixed with viscose, which is an aqueous solution of cellulose xanthate obtained by reacting alkali cellulose with carbon disulfide, at room temperature in any proportion. can be blended in.
- eggshell membrane hydrolyzate neutralized with an organic carboxylic acid can also be blended at room temperature in any proportion, and when mixed with viscose, it is present in viscose even in the presence of an alkaline agent. It can be stabilized by terminating hydrolysis with carbon disulfide.
- the viscose to which the hydrolyzed eggshell membrane component has been added can be spun using conventional viscose rayon spinning equipment under known conditions.
- the raw viscose contains, for example, about 7% by mass to about 10% by mass of cellulose, about 5% by mass to about 8% by mass of sodium hydroxide, and about 2% by mass to about 8% by mass of carbon disulfide. 3.5% by mass or less may be included.
- the temperature of the raw viscose is preferably maintained between about 18°C and about 23°C.
- the amount of the eggshell membrane component added to the viscose in the eggshell membrane hydrolyzate is about 0.5% by mass or more and about 25% by mass as the eggshell membrane component with respect to about 100% by mass of cellulose in the starting viscose. or less, more preferably about 1.0% by mass or more and about 20% by mass or less, and even more preferably about 2.0% by mass or more and about 15% by mass or less.
- the eggshell membrane component-containing viscose rayon fibers of the present invention can be spun using, for example, a common circular nozzle.
- the spinning nozzle it is preferable to use a circular nozzle having a diameter of 0.05 mm or more and 0.12 mm or less and a hole number of 1000 or more and 20000 or less, depending on the target production volume.
- the spinning nozzle is used to extrude the spinning viscose liquid into the spinning bath for spinning and coagulation regeneration.
- the spinning speed is preferably in the range of 30 m/min or more and 80 m/min or less.
- the stretching ratio is preferably 39% or more and 55% or less.
- the drawing rate indicates how much the sliver speed after drawing is increased when the sliver speed before drawing is 100.
- the magnification is 1 before stretching and 1.39 times or more and 1.55 times or less after stretching.
- the spinning bath for example, sulfuric acid of about 95 g/L or more and about 130 g/L or less, zinc sulfate of about 10 g/L or more and about 17 g/L or less, sodium sulfate (mirabilite) of about 290 g/L or more and about It is preferred to use a strongly acidic bath containing 370 g/L or less. A more preferred sulfuric acid concentration is about 95 g/L or more and about 120 g/L or less.
- the eggshell membrane component-containing regenerated cellulose fibers obtained as described above are cut into a predetermined length and subjected to a normal scouring treatment.
- the scouring process can be carried out in the order of hot water treatment, hydrosulfurization treatment, bleaching and pickling by a usual method.
- Bleaching can be carried out under the same conditions as for ordinary rayon fibers, and sodium hypochlorite or hydrogen peroxide may be used. In one embodiment, bleaching with sodium hypochlorite (sodium hypochlorite) is preferred.
- the regenerated cellulose fiber of the present invention contains about 0.5 parts by mass or more and about 25 parts by mass or less relative to about 100 parts by mass of cellulose. Preferably, about 1.0 to about 20 parts by mass, more preferably about 2.0 to about 15 parts by mass. If the content of the eggshell membrane hydrolyzate is less than about 0.5 parts by mass, the characteristics of the eggshell membranes cannot be sufficiently exhibited, and if it exceeds about 25 parts by mass, the fiber strength is remarkably lowered.
- the regenerated cellulose fiber of the present invention has a molecular weight of eggshell membrane hydrolyzate of about 10,000 to about 100,000, preferably about 15,000 to 80,000, more preferably about 15,000 to about 80,000, as measured by GPC. is from about 30,000 to about 60,000. If the molecular weight is less than about 10,000, the solubility in water increases, so that the residual ratio when spinning into rayon fibers becomes low, and if the molecular weight exceeds about 100,000, the spinnability tends to decrease. I don't like it because
- the regenerated cellulose fiber of the present invention is not particularly limited by its fineness.
- the fineness is in the range of 0.3 to 30 dtex. More preferably, it is in the range of 1-12 dtex. If the fineness is less than 0.3 dtex, the strength of the regenerated cellulose fiber may decrease, and the productivity tends to decrease. If the fineness exceeds 30 dtex, the spinnability tends to decrease due to poor regeneration.
- the regenerated cellulose fiber of the present invention is not particularly limited by its fiber length.
- the fiber length is preferably 0.1 to 200 mm, and can be appropriately set according to the application.
- it can be used as a regenerated cellulose fiber and used as a long fiber bundle without cutting the fiber after scouring.
- the fiber of the present invention is formed from eggshell membrane components derived from natural ingredients and regenerated cellulose, and thus is soft and has excellent adhesion to human skin tissue.
- the shape or area of the fiber assembly There are no restrictions on the shape or area of the fiber assembly. Therefore, it is possible to eliminate the drawbacks of natural eggshell membranes that only an area corresponding to the size of the egg can be collected and that the shape is not flat, and it is preferably used as an inner material or a cosmetic face mask.
- the fiber or the fiber aggregate of the present invention contains an eggshell membrane component, so that it can have substantially the same properties as natural eggshell membranes. .
- the eggshell membrane component itself contributes to the fiber formation, it is different from the case where the eggshell membrane component is simply made into a film or the case where the eggshell membrane component is simply attached to the surface of synthetic fibers or natural fibers. , the unique properties of the eggshell membrane are strongly exhibited. Therefore, when fibers or fiber aggregates are applied to wound dressings, by mimicking the network structure of natural eggshell membranes, the cell-producing action of amino acids, the adhesion to tissues due to the network structure, and moderate moisture retention. , air permeability, and sealing performance due to the filter effect.
- the fibers of the present invention or fiber aggregates thereof are provided with physical properties not found in natural eggshell membranes (for example, high fiber strength) by blending the fibers with a binder. can do. Therefore, it can be preferably applied as a wound dressing superior to natural eggshell membranes.
- the fiber structure includes fiber bundles such as spun yarns, tows, and filaments, fabrics such as woven fabrics, knitted fabrics, nonwoven fabrics, paper, and flocked fabrics, and sewing the fabrics. It can include molded articles, batting (wadding), molded articles, liquid products mixed and dispersed with resin components such as PVA and polylactic acid, films, and molded articles.
- the content of the fiber of the present invention in the fiber structure of the present invention can be any value as long as the effect of the fiber structure of the present invention is not impaired.
- the content of the fibers of the present invention in the fiber structure of the present invention is at least about 5% by weight, at least about 10% by weight, at least about 15% by weight, at least about 20% by weight, based on the total weight of the fiber structure. , or at least about 30% by weight.
- the proportion of the regenerated cellulose fiber of the present invention used in the fiber structure of the present invention is not particularly limited. is preferably about 10% by mass or more, more preferably 20% by mass or more, and still more preferably 30% by mass or more.
- Example 1 Production Example 1 of Fibers Containing Eggshell Membrane Components
- An eggshell membrane solution was prepared as follows to produce a fiber containing an eggshell membrane component.
- the raw viscose used contained 8.5% by mass of cellulose, 5.7% by mass of sodium hydroxide, and 2.7% by mass of carbon disulfide. The temperature was kept at 20°C.
- the obtained spinning solution was spun at a spinning speed of 50 m/min and a draw rate of 43% by a two-bath tension spinning method to obtain a fiber having a fineness of 1.7 dtex.
- the composition of the first bath was a Mueller bath (50° C.) containing 100 g/L of sulfuric acid, 15 g/L of zinc sulfate and 350 g/L of sodium sulfate.
- a nozzle having 4000 holes with a hole diameter of 0.06 mm was used as a spinneret for discharging the spinning solution.
- Example 2 Production Example 2 of Fibers Containing Eggshell Membrane Components
- An eggshell membrane solution was prepared as follows to produce a fiber containing an eggshell membrane component. Charge amounts are shown in Table A below.
- a fiber of Example 2 was obtained in the same manner as in Example 1, except that the hydrolyzed eggshell membrane solution prepared by the above method was used.
- Example 3 Production Example 3 of Fibers Containing Eggshell Membrane Components
- An eggshell membrane solution was prepared as follows to produce a fiber containing an eggshell membrane component. Charge amounts are shown in Table A.
- a fiber of Example 3 was obtained in the same manner as in Example 1, except that the hydrolyzed eggshell membrane solution prepared by the above method was used.
- Example 4 Production Example 4 of Eggshell Membrane Component-Containing Fiber
- An eggshell membrane solution was prepared as follows to produce a fiber containing an eggshell membrane component.
- ⁇ Preparation of Eggshell Membrane Solution> The water-washed chicken egg shell membrane (10 kg) was added to a 5% aqueous solution of caustic soda (90 kg) and stirred at 55-65°C for 3 hours for hydrolysis treatment. Then, the mixture was cooled to 50° C., an aqueous citric acid solution prepared by dissolving 5 kg of citric acid in 10 kg of water was added, and filtered through a filter cloth to obtain a hydrolyzed eggshell membrane liquid (120 kg).
- Example 4 was obtained in the same manner as in Example 1 except that the hydrolyzed eggshell membrane solution prepared by the above method was used.
- Example 5 Production Example 5 of Fibers Containing Eggshell Membrane Components
- An eggshell membrane solution was prepared as follows to produce a fiber containing an eggshell membrane component. ⁇ Preparation of Eggshell Membrane Solution> Charge amounts are shown in Table A.
- Example 5 was obtained in the same manner as in Example 1 except that the hydrolyzed eggshell membrane solution prepared by the above method was used.
- Example 6 Production example 6 of eggshell membrane component-containing fiber
- a pulverized eggshell membrane product was prepared as follows to produce a fiber containing an eggshell membrane component. ⁇ Preparation of pulverized eggshell membrane> Charge amounts are shown in Table A.
- Example 6 was obtained in the same manner as in Example 1 except that the hydrolyzed eggshell membrane solution prepared by the above method was used.
- Comparative Example 1 A fiber of Comparative Example 1 was obtained in the same manner as in Example 1, except that the hydrolyzed eggshell membrane solution was aged for 3 days without carbon disulfide treatment or organic acid neutralization after the eggshell membrane was hydrolyzed. rice field.
- Table 1 shows the eggshell membrane component content in the rayon obtained in Examples 1 to 6 and Comparative Example 1.
- FIG. 1 shows a photograph of fibers kneaded with an eggshell membrane component
- FIG. 2 shows a photograph of fibers without kneaded eggshell membrane components.
- the eggshell membrane component content was obtained by measuring the nitrogen content based on the "Semi-Kjeldahl method" listed in the Japanese Pharmacopoeia and multiplying the nitrogen conversion factor of the eggshell membrane by 6.55 to obtain the eggshell membrane content.
- Comparative Example 1 showed that the residual rate was low when spinning into rayon fibers.
- a decrease in the molecular weight (Mw) is considered to be one of the reasons for the decrease in the survival rate of eggshell membrane components.
- the molecular weight (Mw) after standing still for 7 days is 8,000. It is considered that this is because the molecular weight is relatively quickly decreased (about one day) because post-treatment such as neutralization is not performed, and the molecular weight is about 10,000 or less at the time of spinning.
- Table 2 shows the antibacterial test results of the rayon of Examples 1 to 6 and Comparative Example 1.
- the antibacterial test was performed according to the antibacterial test for textile products (JIS L 1902:2015) fungal liquid absorption method, and Staphylococcus aureus was used as the test bacterium.
- the antibacterial properties were evaluated by the antibacterial activity value, and those with an antibacterial activity value of 2.0 or more were indicated as "O", and those with an antibacterial activity value of less than 2.0 were indicated as "X”.
- the fiber of the present invention has the fiber structure of the eggshell membrane, it can be used for inner materials, face mask materials, wound dressings, wet therapy materials, wound sheets, bedsore sheets, cosmetic sheets/packs, and the like. .
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Abstract
Description
(項目1)
卵殻膜加水分解物を含む再生セルロース繊維。
(項目2)
前記再生セルロースが、ビスコースレーヨンを含む、上記項目に記載の繊維。
(項目3)
前記繊維が、セルロース約100質量部に対して、前記卵殻膜加水分解物を約0.5質量部以上、約25質量部以下含む、上記項目のいずれか一項に記載の繊維。
(項目4)
前記卵殻膜加水分解物の重量平均分子量は、約10,000~約100,000である、上記項目のいずれか一項に記載の繊維。
(項目5)
加水分解卵殻膜を含有する再生セルロース繊維を製造する方法であって、
卵殻膜を加水分解する工程と、
前記加水分解を停止して卵殻膜加水分解物を含む溶液を得る工程と、
セルロースを含む紡糸原液と、前記卵殻膜加水分解物を含む溶液とを混合して、卵殻膜加水分解物含有紡糸原液を得る工程と、
前記卵殻膜加水分解物含有紡糸原液からセルロースを凝固再生させて再生セルロース繊維を作製する工程と
を含む、方法。
(項目6)
前記卵殻膜の加水分解がアルカリ存在下で行われる、上記項目に記載の方法。
(項目7)
前記加水分解が、約0.1~約10%(w/w)のアルカリ濃度のアルカリ溶液中で実施される、上記項目のいずれか一項に記載の方法。
(項目8)
前記加水分解の停止が、二硫化炭素との反応及び/または有機カルボン酸での中和によって行われる、上記項目のいずれか一項に記載の方法。
(項目9)
加水分解に使用したアルカリに対して、約0.5~約1.0当量の前記有機カルボン酸によって前記停止が行われる、上記項目のいずれか一項に記載の方法。
(項目10)
前記有機カルボン酸がクエン酸である、上記項目のいずれか一項に記載の方法。
(項目11)
上記項目のいずれか一項に記載の方法によって製造された繊維。
(項目12)
上記項目のいずれか一項に記載の繊維、または上記項目のいずれか一項に記載の方法によって製造された繊維を含む、繊維構造物。
以下に本開示の好ましい実施形態を説明する。以下に提供される実施形態は、本開示のよりよい理解のために提供されるものであり、本開示の範囲は以下の記載に限定されるべきでない。したがって、当業者は、本明細書中の記載を参酌して、本開示の範囲内で適宜改変を行うことができることは明らかである。また、本開示の以下の実施形態は単独でも使用されあるいはそれらを組み合わせて使用することができる。
[卵殻膜]
本発明の再生セルロース繊維の材料となる卵殻膜の由来は特に限られるものではない。例えば、卵殻膜としては、ニワトリ、ウズラ、シチメンチョウ、カモ、アヒル、ガチョウ、ダチョウ、ホロホロチョウ、オナガドリ、チャボ、ハト、コブハクチョウ、エミュー、またはキジなどの家禽鳥類の卵殻膜を用いることができる。本発明の一実施形態においては、入手が容易で、産卵種としても多産であり、卵も大きく大量飼育方法が確立しているという点でニワトリが好ましい。
本発明の一実施形態において、卵殻膜の加水分解をスムーズに行うために卵殻膜を予め粉砕しておくことが好ましく、加水分解をスムーズに行い得る程度に粉砕されていれば、その粉砕後のサイズは特に限られない。一実施形態において、粉砕した卵殻膜はその径が約0.1μm以上、約5mm以下であることが好ましく、約1μm以上、約1mm以下であることがより好ましい。この範囲の卵殻膜とすることにより、卵殻膜を加水分解する際に、均一に加水分解することができる。卵殻膜の径を約0.1μm未満にするには製造上も困難であり、加水分解した卵殻膜成分の分子量が低くなり過ぎ、好ましくない。
本発明の卵殻膜は加水分解して繊維製造に供することができる。
卵殻膜の加水分解については、アルカリ存在下、高温で加水分解することにより、分子量が比較的大きい可溶化卵殻膜が得られることが知られている(特許6288686)が、この文献に記載されたアルカリ存在下での加水分解では分解反応を停止させるために酸性物質で中和する工程が必要であり、中和工程で卵殻膜の特長であるシスチン含量が低下するという問題がある。
本発明における加水分解反応は、得られる加水分解物において、重量平均分子量(Mw)が約10,000~約100,000となるタイミングで、好ましくは約15,000~約80,000となるタイミングで、さらに好ましくは約30,000~約60,000となるタイミングで停止されることが好ましい。加水分解反応は、当該分野で任意の手段によって達成され得る。好ましい実施形態において、卵殻膜の加水分解を停止する工程には次の2つの方法があり、いずれの工程を用いてもよい。
加水分解反応終了後、約30℃まで冷却し、二硫化炭素を投入してアルカリ存在下で加水分解を停止する。加水分解が終了した後、加水分解を停止するために速やかに冷却することができ、氷等の寒剤を系内に投入することもできる。
加水分解反応後、速やかに約50℃まで冷却し、アルカリ加水分解に使用したアルカリ剤の約0.5~約1.0当量の酸を速やかに投入し、加水分解を停止する。投入する酸としては強酸であっても弱酸であってもいずれであってもよいが、塩酸や硫酸などの強酸では約0.5等量の酸を添加した段階で加水分解卵殻膜が析出し、更に硫黄臭の発生が激しくシスチン及び/またはシステインの脱落があるため、弱酸であることが好ましい。一実施形態において、弱酸としては、水中での酸解離定数(pKa)が0以上を示す酸を挙げることができ、好ましくは約0.2以上であり、さらに好ましくは約1.0以上であり、さらに好ましくは約1.5以上であり、さらに好ましくは約2.0以上であり、さらに好ましくは約3.0以上であり、上限は特に設定されない。例えば、酢酸のpKa=4.6、炭酸のpKa=6.4、シュウ酸のpKa=1.0、クエン酸のpKa=3.1、安息香酸のpKa=4.0等が挙げられる。
再生セルロース繊維は、木材あるいは非木材に由来する天然セルロースを原料として、特殊な溶剤に溶解、錯体形成剤との反応、あるいは化学修飾による誘導体の形成などにより可溶化したセルロースを溶解して得られる紡糸原液を紡糸浴中で紡糸し繊維状のセルロースに再生して得られる繊維であり、優れた吸湿性を有するなど天然繊維に近い特性を有する人造繊維として古くから親しまれている。再生セルロース繊維は、綿に近い繊維であり、また天然繊維の代替ではあるものの、これに更に新たな特性を付与しようとする試みも種々実施されている。
(1)卵殻膜をアルカリ存在下で加水分解した後に二硫化炭素を加え加水分解を停止する工程
(2)卵殻膜をアルカリ存在下で加水分解した後に有機カルボン酸で中和することにより加水分解を停止する工程
(3)(1)または(2)の工程を経て得られた卵殻膜加水分解物を紡糸原液ビスコースと配合し湿式紡糸法によりビスコースレーヨン繊維を得る工程
(4)(3)の工程を経て得られたビスコースレーヨン繊維をステープルに加工する工程
本発明の一実施形態において、二硫化炭素で加水分解を停止させた卵殻膜加水分解物は、アルカリセルロースを二硫化炭素と反応させたセルロースザンテートの水溶液であるビスコースと任意の割合で室温での配合が可能である。また他の実施形態において、有機カルボン酸で中和した卵殻膜加水分解物も任意の割合で室温での配合が可能であり、ビスコースと混合するとアルカリ剤存在下であってもビスコースに存在する二硫化炭素により加水分解が停止されることにより安定化させることができる。
一実施形態において、加水分解卵殻膜成分を添加したビスコースは通常のビスコースレーヨン紡糸設備を使用して、公知の条件により紡糸が可能である。一実施形態において、原料ビスコースは、例えば、セルロースを約7質量%以上約10質量%以下、水酸化ナトリウムを約5質量%以上約8質量%以下、二硫化炭素を約2質量%以上約3.5質量%以下含んでもよい。一実施形態において、原料ビスコースの温度は約18℃以上約23℃以下に保持するのが好ましい。
一実施形態において、上記のようにして得られた卵殻膜成分含有再生セルロース繊維を所定の長さにカットして通常の精練処理を行う。精練工程は通常の方法により、熱水処理、水硫化処理、漂白、酸洗いの順で行うことができる。漂白は通常のレーヨン繊維と同一条件により行うことができ、次亜塩素酸ナトリウムまたは過酸化水素を使用してもよい。一実施形態において、次亜塩素酸ナトリウム(次亜塩素酸ソーダ)で漂白を行うのが好ましい。
本発明の一局面において、本明細書の他の箇所で説明した加水分解卵殻膜を含有する再生セルロース繊維、またはそれを製造する方法によって得られた繊維を含有する繊維構造物が提供される。一実施形態において、繊維構造物としては、紡績糸、トウ、フィラメント等の繊維束状のもの、織物、編物、不織布、紙、フロック加工生地等の布地状にされたもの、当該布地を縫製等してなる成形体、中綿(詰綿)、モールド成型体、PVA、ポリ乳酸等の樹脂成分と混合し分散した液状品、及びフィルム、成形体を含むことができる。
本明細書において引用された、科学文献、特許、特許出願などの参考文献は、その全体が、各々具体的に記載されたのと同じ程度に本明細書において参考として援用される。
以下のようにして卵殻膜溶液を調製し、卵殻膜成分を含有する繊維を製造した。
水洗した鶏卵卵殻膜(500g)を5%苛性ソーダ水溶液(3500g)に入れ、55~65℃で3時間攪拌し加水分解した。その後、30℃まで冷却し二硫化炭素120gを投入し、1時間反応させた。その後にろ布ろ過して卵殻膜加水分解液(4000g)を得た。
得られた卵殻膜加水分解液の分子量は、以下のGPC条件によって測定した。
装置:HLC-8320GPC(東ソー製)
移動相:30%メタノール水溶液(v/v)
酢酸ナトリウム0.5%(w(g)/v(mg))含有
カラム:TSKgel G6000PWxl(東ソー製)
TSKgel G5000PWxl(東ソー製)
TSKgel G4000PWxl(東ソー製)
検出器:RI&UV(210nm)
流量:1ml/min
カラム温度:40℃
サンプル濃度:0.25%(w(g)/v(mg))
注入量:50μl
校正曲線用標準物質:PEO
[紡糸原液の調製]
調製した加水分解卵殻膜液を卵殻膜成分がセルロース100質量部に対して10質量部となるように原料ビスコースに添加し、撹拌混合を行った。
得られた紡糸液を、2浴緊張紡糸法により、紡糸速度50m/分、延伸率43%で紡糸して、繊度1.7dtexの繊維を得た。第1浴(紡糸浴)の組成は、硫酸100g/L、硫酸亜鉛15g/L、硫酸ナトリウム350g/L含むミューラー浴(50℃)を用いた。また、紡糸液を吐出する紡糸口金には、孔径0.06mmのホールを4000個有するノズルを用いた。
上記で得られたビスコースレーヨンの糸条を、繊維長38mmにカットし、精練処理を行った。精練処理は熱水処理後に水洗を行い、続いて水硫化処理、漂白(次亜塩素酸ソーダ)、酸洗いの順で行った。油剤を付与した後に圧縮ローラーにより余分な水分と油剤を除去し、その後、乾燥処理(60℃、7時間)を行い、実施例1のレーヨン繊維を得た。
以下のようにして卵殻膜溶液を調製し、卵殻膜成分を含有する繊維を製造した。
仕込み量は以下の表Aのとおりである。
以下のようにして卵殻膜溶液を調製し、卵殻膜成分を含有する繊維を製造した。
仕込み量は表Aのとおりである。
以下のようにして卵殻膜溶液を調製し、卵殻膜成分を含有する繊維を製造した。
<卵殻膜溶液の調製>
水洗した鶏卵卵殻膜(10kg)を5%苛性ソーダ水溶液(90kg)に入れ、55~65℃で3時間攪拌し加水分解処理を行った。その後、50℃まで冷却しクエン酸5kgを水10kgに溶解したクエン酸水溶液を投入し、ろ布ろ過して加水分解卵殻膜液(120kg)を得た。
上記の方法で調製した加水分解卵殻膜液を使用した以外は実施例1と同様にして実施例4の繊維を得た。
以下のようにして卵殻膜溶液を調製し、卵殻膜成分を含有する繊維を製造した。
<卵殻膜溶液の調製>
仕込み量は表Aのとおりである。
上記の方法で調製した加水分解卵殻膜液を使用した以外は実施例1と同様にして実施例5の繊維を得た。
以下のようにして卵殻膜粉砕品を調製し、卵殻膜成分を含有する繊維を製造した。
<卵殻膜粉砕品の調製>
仕込み量は表Aのとおりである。
上記の方法で調製した加水分解卵殻膜液を使用した以外は実施例1と同様にして実施例6の繊維を得た。
卵殻膜を加水分解した後、二硫化炭素処理も有機酸中和処理も行わずに3日間経時した加水分解卵殻膜液を使用した以外は実施例1と同様にして比較例1の繊維を得た。
実施例2の操作と同様にして卵殻膜を加水分解した後、二硫化炭素を卵殻膜に対し57%添加し1時間反応させた。反応後に二硫化炭素が分離して反応器の底に滞留しており、二硫化炭素が過剰であることを確認した。加水分解卵殻膜液に二硫化炭素が存在しており、紡糸工程における安全性が確保できないため繊維化は行わなかった。
実施例6の操作と同様にして卵殻膜を加水分解した後、加水分解に使用した苛性ソーダの1.49当量のクエン酸で中和した。中和後に加水分解卵殻膜の析出が認められクエン酸が過剰であることを確認した。加水分解卵殻膜液に不溶物が存在するため紡糸時に口金が目詰まりする可能性があり紡糸は行わなかった。
実施例1~6および比較例1において得られたレーヨン中に含まれる卵殻膜成分含量を求めた結果は表1のとおりである。また一例として、卵殻膜成分を練り込んだ繊維の写真を図1に、練り込んでいない繊維の写真を図2に示した。卵殻膜成分含量は日本薬局方収載「セミケルダール法」に基づき窒素含量を測定し、卵殻膜の窒素換算係数6.55をかけて卵殻膜含量とした。
実施例1~6および比較例1のレーヨンの抗菌性試験結果は表2のとおりである。抗菌性試験は繊維製品抗菌性試験(JIS L 1902:2015)菌液吸収法に準じて行い、供試菌は黄色ブドウ球菌を用いた。抗菌性は抗菌活性値で評価し、抗菌活性値が2.0以上のものを「〇」、2.0未満のものを「×」と記載した。
以上のように、本開示の好ましい実施形態を用いて本開示を例示してきたが、本開示は、特許請求の範囲によってのみその範囲が解釈されるべきであることが理解される。本明細書において引用した特許、特許出願及び他の文献は、その内容自体が具体的に本明細書に記載されているのと同様にその内容が本明細書に対する参考として援用されるべきであることが理解される。本願は、日本国特許庁に2021年12月24日に出願された特願2021-210846に対して優先権主張をするものであり、その内容はその全体があたかも本願の内容を構成するのと同様に参考として援用される。
Claims (12)
- 卵殻膜加水分解物を含む再生セルロース繊維。
- 前記再生セルロースが、ビスコースレーヨンを含む、請求項1に記載の繊維。
- 前記繊維が、セルロース約100質量部に対して、前記卵殻膜加水分解物を約0.5質量部以上、約25質量部以下含む、請求項1または2に記載の繊維。
- 前記卵殻膜加水分解物の重量平均分子量は、約10,000~約100,000である、請求項1~3のいずれか一項に記載の繊維。
- 加水分解卵殻膜を含有する再生セルロース繊維を製造する方法であって、
卵殻膜を加水分解する工程と、
前記加水分解を停止して卵殻膜加水分解物を含む溶液を得る工程と、
セルロースを含む紡糸原液と、前記卵殻膜加水分解物を含む溶液とを混合して、卵殻膜加水分解物含有紡糸原液を得る工程と、
前記卵殻膜加水分解物含有紡糸原液からセルロースを凝固再生させて再生セルロース繊維を作製する工程と
を含む、方法。 - 前記卵殻膜の加水分解がアルカリ存在下で行われる、請求項5に記載の方法。
- 前記加水分解が、約0.1~約10%(w/w)のアルカリ濃度のアルカリ溶液中で実施される、請求項5または6に記載の方法。
- 前記加水分解の停止が、二硫化炭素との反応及び/または有機カルボン酸での中和によって行われる、請求項5~7のいずれか一項に記載の方法。
- 加水分解に使用したアルカリに対して、約0.5~約1.0当量の前記有機カルボン酸によって前記停止が行われる、請求項8に記載の方法。
- 前記有機カルボン酸がクエン酸である、請求項8または9に記載の方法。
- 請求項5~10のいずれか一項に記載の方法によって製造された繊維。
- 請求項1~4のいずれか一項に記載の繊維、または請求項5~10のいずれか一項に記載の方法によって製造された繊維を含む、繊維構造物。
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| EP22911398.0A EP4455377A1 (en) | 2021-12-24 | 2022-12-23 | Recycled cellulose fibers, method for producing same, and fiber structure of same |
| JP2023569567A JP7568246B2 (ja) | 2021-12-24 | 2022-12-23 | 再生セルロース繊維、その製造方法、及びその繊維構造物 |
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- 2022-12-23 JP JP2023569567A patent/JP7568246B2/ja active Active
- 2022-12-23 CN CN202280085739.XA patent/CN118475736A/zh active Pending
- 2022-12-23 EP EP22911398.0A patent/EP4455377A1/en active Pending
- 2022-12-23 WO PCT/JP2022/047585 patent/WO2023120697A1/ja not_active Ceased
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Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2023120697A1 (ja) | 2023-06-29 |
| CN118475736A (zh) | 2024-08-09 |
| EP4455377A1 (en) | 2024-10-30 |
| JP7568246B2 (ja) | 2024-10-16 |
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