WO2004094482A1 - 吸水性樹脂複合体およびその堆積物の製造方法 - Google Patents
吸水性樹脂複合体およびその堆積物の製造方法 Download PDFInfo
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- WO2004094482A1 WO2004094482A1 PCT/JP2004/005375 JP2004005375W WO2004094482A1 WO 2004094482 A1 WO2004094482 A1 WO 2004094482A1 JP 2004005375 W JP2004005375 W JP 2004005375W WO 2004094482 A1 WO2004094482 A1 WO 2004094482A1
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- Prior art keywords
- water
- absorbent resin
- fibers
- fiber
- resin composite
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/44—Polymerisation in the presence of compounding ingredients, e.g. plasticisers, dyestuffs, fillers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S526/00—Synthetic resins or natural rubbers -- part of the class 520 series
- Y10S526/918—Polymerization reactors for addition polymer preparation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S526/00—Synthetic resins or natural rubbers -- part of the class 520 series
- Y10S526/923—Ethylenic monomers containing at least one salt group
Definitions
- the present invention relates to a method for producing a water-absorbent resin composite and its deposit.
- the present invention relates to a method for producing a water-absorbent resin composite and a deposit thereof.
- the deposit of the water-absorbent resin composite produced by the present invention is thin, flexible, and openable.
- the water-absorbent resin composite and the deposit thereof produced by the present invention are preferably used for producing water-absorbent articles such as disposable diapers, sanitary napkins and other sanitary materials, industrial materials and the like. Background art
- water-absorbing resins that absorb a large amount of water have been widely used for sanitary materials, industrial materials, and the like.
- a water-absorbent resin is used as a composite with other materials, such as disposable diapers, the water-absorbent resin can be fixed before water absorption, fixed after water absorption, thinner as a composite, flexible, and highly absorbent.
- Japanese Patent Application Laid-Open No. 63-633723 discloses that a water-absorbent resin absorbs water or a water-containing solvent, kneads and disperses it with hydrophilic fibers in a state of being swollen, and then forms a dry powder frame or a water-soluble ethylenic resin.
- a composite comprising a hydrophilic base material in which at least a part of the fiber is embedded is disclosed by polymerizing the unsaturated monomer while mixing it with the hydrophilic fiber, followed by drying and pulverization.
- a composite comprising a water-absorbing resin and fibers can be obtained.
- the complex obtained by this technique must be ground before it can be used.
- Japanese Patent Publication No. 5-58030 describes a water-absorbent article comprising a fibrous base material at least partially composed of hydrophobic fibers and a water-absorbent resin adhered to the base material.
- This water-absorbent article is characterized in that at least a part of the water-absorbent resin is substantially spherical, wraps the base fiber, and is discontinuously attached.
- the base material is a fiber
- the water-absorbing resin is also fixed.
- the water-absorbent resin encloses the fibers, it is inevitable that the fibers hinder the swelling of the water-absorbent resin.
- the present invention has been made to solve the problems of the prior art described in the above publication. That is, according to the present invention, the fibers are stably fixed to the water-absorbent resin not only at the time of drying but also at the time of water absorption, and the water-absorbent resin can be fixed to the fibers at a high content and uniformly, and is flexible and thin. It is an object of the present invention to provide a method for efficiently producing a composite of a water-absorbent resin and a fiber and a deposit thereof, which can be formed and opened, and can be uniformly mixed with other materials.
- the fibers embedded in the water-absorbent resin particles and partially exposed to the resin particles are partially adhered to the surface of the resin particles without being embedded in the resin particles. It is an object of the present invention to provide a method for producing a water-absorbent resin composite having two types of fibers, that is, fibers in a very efficient manner.
- the present inventors have found that the object can be achieved by a method for producing a water-absorbent resin composite having the following specific steps and a deposit thereof.
- a water-absorbent resin composite containing one water-absorbent resin particle and two or more fibers is produced in a reactor from a polymerizable monomer and a fiber that form a water-absorbent polymer by polymerization.
- the method wherein the water-absorbent resin composite has the water-absorbent resin particles having a substantially spherical shape, and at least one of the two or more fibers has a part of the fibers embedded in the resin particles. And at least one of the fibers is exposed from the resin particles, and at least one of the two or more fibers has a portion of the fibers without being embedded in the resin particles.
- the method comprises the steps of: adhering to the surface of the resin particles, the method comprising: supplying a droplet containing the polymerizable monomer and a solvent before and / or during polymerization; and supplying a droplet from a first supply port of the reactor.
- the fibers of (1) are brought into contact in the gas phase to polymerize the polymerizable monomer. And then polymerizable monomer, solvent and fiber during polymerization.
- the water-absorbent resin composite is produced by contacting a droplet containing water in the gas phase with a second fiber supplied from a second supply port of the reactor, and further promoting the polymerization of the polymerizable monomer.
- a method for producing a water-absorbent resin composite comprising the steps of:
- the present invention also provides a method for producing a deposit of a water-absorbent resin composite, which comprises a step of depositing the water-absorbent resin composite obtained by this method to produce a deposit.
- the fibers are stably fixed to the water-absorbent resin not only at the time of drying but also at the time of water-absorption swelling, and the water-absorbent resin can be uniformly fixed to the fibers at a high content.
- Efficient composition containing a water-absorbent resin-fiber composite which is flexible and thin, can be opened itself, and can be evenly mixed with other materials Can be manufactured well.
- FIG. 1 is a cross-sectional view for explaining a water absorption capacity measuring instrument under pressure.
- FIG. 2 is a cross-sectional view for explaining a thickness measuring tool.
- FIG. 3 is a schematic diagram for explaining a jig for measuring rigidity by the heart loop method.
- FIG. 4 is a cross-sectional view showing the configuration of the water absorbent article.
- FIG. 5 is a schematic diagram showing a low tap type shaker.
- FIG. 6 is a cross-sectional view for explaining a jig for measuring a gel falling rate.
- FIG. 7 is a view showing a cutting line of the sample in the gel detachment rate measurement.
- FIG. 8 is a schematic view for explaining a nozzle used for producing a water-absorbent resin composite. ⁇
- FIG. 9 is a schematic diagram of the sample obtained in Example 1 and the results of observation by a scanning electron microscope (101 and 102).
- FIG. 10 shows the results of scanning electron microscope observation of the sample obtained in Example 2 (103 ⁇ 1 0 4).
- FIG. 11 shows scanning electron microscope observation results (105 and 106) of the sample obtained in Example 3.
- FIG. 12 shows the results of a scanning electron microscope observation (107 and 108) of the sample obtained in Example 4.
- FIG. 13 is a schematic view of the sample obtained in Comparative Example 1 and the results of observation by a scanning electron microscope (109 and 110).
- FIG. 14 is a schematic diagram of the sample obtained in Comparative Example 2 and the results of scanning electron microscope observation (11 1 and 11 2).
- FIG. 15 is a schematic view of the sample obtained in Comparative Example 3 and the results of observation by a scanning electron microscope (113 and 114).
- FIG. 16 is a schematic diagram of the sample obtained in Comparative Example 4 and a result of observation by a scanning electron microscope (115 and 116).
- 1 is an adapter
- 2 is a sample stand
- 3 is a sample
- 4 is a distance
- 1 1 is a wire mesh
- 1 2 is a cylindrical tube
- 1 3 is a petri dish
- 1 3 is a load
- 2 1 is a water-impermeable polyethylene.
- 2 2 is a tissue
- 2 4 is a high-density water-absorbent resin composite composition
- 2 5 is a tissue
- 2 6 is a water-permeable polyester fiber nonwoven fabric
- 3 1 is a water-absorbing article
- 3 2 is a cylinder
- 34 is an ataryl plate
- 41 is a center
- 42 is a cutting line
- 51 is a grip
- 52 is a sampler piece.
- a numerical range represented by using “to” means a range including numerical values described before and after “to” as a lower limit and an upper limit.
- the production method of the present invention is a method for producing a novel water-absorbent resin composite having a characteristic structure (hereinafter, “composite A”) and a deposit thereof.
- composite A a novel water-absorbent resin composite having a characteristic structure
- the composite A includes one substantially spherical water-absorbing resin particle and two or more fibers.
- a part of the fibers is embedded in the water-absorbent resin particles and a part is exposed from the water-absorbent resin particles.
- one or more fibers included in the composite A have a part of the fibers adhered to the surface of the water-absorbent resin particles without being embedded in the water-absorbent resin particles. That is, the essential components of complex A are the following three types.
- partially embedded fiber Fiber partially embedded in the water-absorbent resin particles and partially exposed from the water-absorbent resin particles (hereinafter “partially embedded fiber”) 3 On the surface of the water-absorbent resin particles Fibers that are bonded but not embedded in the water-absorbent resin particles (hereinafter “surface-bonded fibers”)
- the fibers bonded to the water-absorbent resin particles in the composite A that is, (1) partially embedded fibers (3) and surface-bonded fibers may be collectively referred to as “bonded fibers”.
- the dry weight ratio of the binding fiber and the water-absorbent resin particles in the composite A is preferably from 1: 1 to 1: 1,000,000, more preferably from 1: 2 to 1: 100,000. More preferably, the ratio is 1: 3 to 1: 10,000. 2.
- the water-absorbing resin plays a role in the complex A to absorb liquids such as water, urine, blood, and menstrual blood according to the purpose of use.
- the water-absorbent resin in the complex A is usually a polymer having a saturated water-absorbing ability capable of absorbing liquids such as water, urine, blood, menstrual blood, and the like at a normal temperature and a normal pressure by about 1 to 1,000 times its own weight.
- functional groups with high affinity for these liquids are added to the polymer chains. Must have.
- Such functional groups include (partially) neutralized carboxylic acids, carboxylic acids, (partially) neutralized sulfonic acids, sulfonic acids, and hydroxy. Of these, partially neutralized carboxylic acids are preferred.
- an unsaturated carboxylic acid is preferable, and acrylic acid is particularly preferable.
- the molecular structure of this polymer may be linear, but it is necessary to maintain the shape even after absorbing and swelling the desired liquid. For this reason, a crosslinked polymer having a crosslinked structure between polymer chains is usually preferable so that the polymer chains are not dissolved.
- This cross-linking may be either chemical cross-linking such as covalent bonding or ionic bonding, or physical cross-linking by entanglement of polymer chains. From the viewpoint of chemical stability, chemical crosslinking is preferable, and covalent bond is more preferable. ⁇
- the preferred water-absorbing resin is a crosslinked unsaturated carboxylic acid polymer, and more preferably a crosslinked acrylic acid polymer.
- the water-absorbing resin in the composite A is substantially spherical particles.
- substantially spherical refers to a shape having a true sphere and an ellipsoid as a whole, and fine irregularities (ie, wrinkles, protrusions, depressions, etc.) may be provided on the surface. Also, voids such as pores or cracks may be present on the surface or inside.
- the particle size of the water-absorbent resin particles is preferably from 50 to 1,000 ⁇ .
- the particle size is more preferably from 100 to 900 m, particularly preferably from 200 to 800 ⁇ .
- the disadvantage is that grains form.
- the substantially spherical water-absorbing resin particles used in the present invention do not have such a disadvantage.
- it has the advantage that it can be densely packed because it can be densely packed compared to irregular-shaped products.
- the binding fibers are composed of partially embedded fibers and surface-bonded fibers. Less than, Each fiber will be described in detail.
- each fiber is firmly bonded to the water-absorbent resin before and after water absorption from the viewpoint of the fixability of the water-absorbent resin.
- the water-absorbing resin is one of the substances having the highest hydrophilicity, and in this sense, it can be said that the fibers having higher hydrophilicity have higher adhesive strength.
- Water contact 3 ⁇ 4 can be used as a quantitative measure of the hydrophilicity of the fiber. In other words, the smaller the contact angle, the smaller the bond strength, the greater the adhesive strength (ie, the greater the hydrophilicity), and the smaller the contact angle (the lower the hydrophilicity), the larger the contact angle. is there.
- a water-absorbent resin composite having a special shape containing at least two fibers per one water-absorbent resin particle using fibers having a contact angle of water of 60 ° or less on the fiber material surface.
- the contact angle of water on the surface of the fiber material is more preferably 50 ° or less, and most preferably 40 ° or less.
- highly hydrophilic fibers so-called hydrophilic fibers, include senorelose-based fibers such as pulp, rayon, cotton, and regenerated cellulose, and polyamide-based and polyvinyl alcohol-based fibers.
- hydrophilic fiber not only enhances the adhesive strength with the water-absorbent resin, but also has other functions of the hydrophilic fiber, such as an action of attracting water to the water-absorbent resin (so-called water conduction). Sex) can also be increased.
- pulp among hydrophilic fibers from the viewpoint of low irritation to skin and soft feel.
- hydrophobic fibers fibers having low hydrophilicity from the viewpoint of water permeability and water diffusibility, that is, hydrophobic fibers.
- polyester, polyethylene, polypropylene, polystyrene, polychlorinated vinyl, polyvinylidene chloride, polyacrylonitrile, polyurea, polyurethane, polyfluoroethylene, and polyvinylidene cyanide fibers can be mentioned.
- a hydrophilic fiber can be selected as the embedding fiber
- a hydrophobic fiber can be selected as the surface adhesive fiber. If such an embodiment is adopted, it can be expected that the hydrophobic fibers improve the diffusivity of water between the water-absorbing resins.
- the hydrophilicity and hydrophobicity of the series of each exemplified fiber are not absolute, and they are changed by a raw material monomer / modification or the like. For this reason, the hydrophilicity and hydrophobicity of the fibers used are evaluated by contact angle measurement.
- the contact angle depends on the shape of the fiber material to be measured, the smoothness of the surface, and the like.In the present invention, the contact angle is obtained by molding the fiber material into a film, and measuring the contact angle of distilled water on the smooth surface as described below. It is a value measured using a device that performs the measurement.
- preferred as the binding fibers are those having an average fiber length of 50 to 50,00O / zm. More preferably, it is 100 to 300, 000 jLt m, and even more preferably, it is 500 to 100, 000 / ⁇ m. If the fiber length is too long, the fiber adheres to a plurality of water-absorbent resins, so that the independence of each water-absorbent resin composite cannot be ensured, and it tends to be difficult to open a composition containing this composite. . Conversely, if the fiber length is too short, it tends to be difficult to embed and adhere to the water absorbent resin.
- the ratio of the particle size of the water-absorbent resin to the fiber length is preferably from 2: 1 to 1: 1,000. More preferably, the ratio is from 1: 1 to 1: 500, and particularly preferably from 1: 2 to 1: 100.
- the binding fiber used in the present invention preferably has a fiber diameter of 0.1 to 500 decitex, more preferably 0.1 to 100 decitex, and still more preferably 1 to 50 decitex. And particularly preferably 1 to 10 decitattas. If the fiber diameter is too large, the rigidity of the fiber is so large that not only embedding and adhesion to the water-absorbing resin become difficult, but also compression molding becomes difficult, which may be unfavorable for thinning. Also, for applications such as sanitary products, The feel is also undesirable. Conversely, if the fiber diameter is too small, water conductivity and diffusibility may not be ensured. In addition, the blocking phenomenon may not be prevented due to insufficient rigidity.
- the appearance of the fibers may be linear or have crimps such as crimps.
- the fiber type, fiber length, fiber diameter, and appearance are appropriately selected.
- Partially embedded fibers play a role in securing the fixability of the water absorbent resin. These fibers also improve the fixability of the water-absorbing resin before and after water absorption. That is, the fibers extending from the surface of the water-absorbent resin prevent the water-absorbent resin from rotating or translating when pressed. Some of these fibers are embedded in the water-absorbent resin and do not detach from the water-absorbent resin even after water absorption, so they can play an important role in the fixability after water absorption.
- the shape of the fiber used may be a hollow or side-by-side type having high rigidity in order to enhance water conductivity.
- the fibers When the partially embedded fibers are composed of hydrophilic fibers, the fibers have an effect of increasing the water conductivity of the water-absorbent resin. That is, water can be directly guided into the water-absorbent resin through the fibers. In order to exhibit this function more effectively, it is preferable to select and use the above-mentioned fibers having high water conductivity.
- these fibers also have a role of ensuring the independence of each water absorbent resin composite.
- the fibers prevent the water-absorbing resins from fusing due to steric hindrance in the later-described composite precursor polymerization process. That is, the fibers that elongate the surface of the water-absorbent resin hinder the contact between the water-absorbent resins during the polymerization progress of the composite precursor, thereby preventing the fusion of the water-absorbent resins.
- each water-absorbent resin composite maintains its independence, prevents adhesion to the reactor wall during the manufacturing process and the treatment process, and also allows the composition described later to have openability. it can.
- this fiber gives each of the water-absorbing composites an appropriate physical entanglement, and also gives a form retention property that when the composites are collected and formed into a mass, the composites do not easily fall apart under their own weight. That is, the composite A has a shape retention property by itself without adding free fibers and the like. Therefore, the composite A can impart opening properties when formed into a composition. In addition, it has a distinctive feature that it also has shape retention. In addition, this fiber gives Composite A a soft, smooth feel. Combined with the fact that the water-absorbent resin is substantially spherical, the composite A gives a very soft feel when pressed even in a dry state, and is therefore suitable for applications such as sanitary materials.
- the surface adhesive fibers have an effect of securing the fixability of the water-absorbing resin before absorbing water. Furthermore, after swelling, the fibers on the surface of the water-absorbent resin form a gap between the water-absorbent resins, and have an effect of securing a water flow path. In order to obtain this effect, the fibers do not necessarily have to adhere to the water-absorbent resin even after the water absorption, but it is preferable that at least the fibers are closely arranged on the surface of the water-absorbent resin. Therefore, it is advantageous that the fibers adhere to the surface of the water-absorbent resin before water absorption as in the present invention.
- fibers having a certain rigidity in order to form a gap between the water-absorbent resins and secure a flow path for water. Further, in combination with the above-mentioned partially embedded fibers, there is also an effect of securing the fixability of the water-absorbing resin before water absorption.
- the shape of the fibers used may be hollow or side-by-side type or the like in order to enhance the diffusivity.
- the surface-adhesive fibers are composed of hydrophilic fibers
- the swelling of the water-absorbent resin when the fibers absorb water prevents the water-absorbent resins from coming into contact with each other and blocking the water flow path.
- the surface-adhesive fibers are made of a hydrophobic resin
- the fibers exhibit a function of improving the diffusion of water between the water-absorbent resins. Further, this fiber has a role similar to that of the above-mentioned partially embedded fiber in ensuring the independence of each water-absorbent resin composite, shape retention, softness, and smooth feel, and gives the same effect.
- securing of water-absorbent resin and securing of water absorption capacity such as retention capacity and water absorption capacity under pressure Not compatible with That is, in order to ensure sufficient fixation not only before water absorption but also after water absorption, a strong adhesive force between the water-absorbing resin and the fiber, which surpasses the water-swelling expansion force, is required even after water absorption. As a matter of course, the fibers cause the water-absorbent resin to inhibit water absorption and swelling, and do not provide sufficient water absorption capacity.
- the bonding surface between the water-absorbent resin and the fiber is allowed to freely swell in order to secure water absorption capacity such as holding capacity and water absorption under pressure, the bonding surface between the water-absorbent resin and the fiber will be destroyed. Does not provide sufficient fixation.
- both the partially embedded fiber and the surface adhesive fiber are essential. That is, a water-absorbent resin composite having only partially embedded fibers is not sufficiently effective in preventing the blocking phenomenon during water absorption. On the other hand, a water-absorbent resin composite having only surface-adhesive fibers does not have sufficient fixability of the water-absorbent resin after absorbing water. Therefore, both fibers are indispensable in order to exhibit the above-mentioned action before and after water absorption. The coexistence of both fibers has made it possible to ensure both the fixing properties of the water-absorbent resin and the water-absorbing ability, which are originally contradictory.
- the complex A has a feature that ensures not only the retention ability but also the water absorption ability under pressure while securing sufficient fixability not only before water absorption but also after water absorption.
- the types of the two fibers may be the same or different, and are appropriately selected for the purpose of use and the respective effects.
- One of the characteristics of the composite A is that not only the aggregate of the composite A has the opening property but also that the water-absorbent resin composite composition containing the complex A has the opening property. The point is that it can be. Such features are ensured because each complex is substantially independent. That is, it is desired that the fibers constituting one composite do not substantially adhere to the other composite. To this end, it depends on the manufacturing conditions, but can be obtained by appropriately selecting the fiber length of the fiber used as described above. The openability can be evaluated based on the stiffness of the worsted and the state of breakage of the water-absorbent resin particles after the worsting, as described later.
- the complex A not only has the aggregate of the complex A It is also characterized in that the water-absorbent resin composite composition containing the composite A can have shape retention.
- the binding fibers in the composite A give each of the water-absorbing composites an appropriate physical entanglement, and when the water-absorbent resin composite composition containing the composite A is formed into a lump, the composite fiber is easily weighed at its own weight. Provides form retention that does not fall apart.
- the water-absorbent resin composite composition obtained by the production method of the present invention (hereinafter referred to as “the composition of the present invention”) is characterized by containing the above-mentioned composite A, And other components such as composite B, composite C and free fibers.
- the dry weight ratio of the total fiber (bonded fiber + free fiber) to the water-absorbent resin is usually 70:30 to 2:98, preferably 50:50 to 5:95, and more preferably. Is 30:70 to 5:95.
- the ratio of the bonding fibers to the total fibers is usually 3 to 100%.
- the compositions of the present invention is preferably a bulk density of 0. 20 ⁇ 0. 85 gZcm 3, 0.
- composition of the present invention is independent and has a spreadability, the composition itself maintains the spreadability.
- the composition of the present invention usually contains the above-mentioned complex A in a weight fraction of 1 or less, preferably 0.1 or more, more preferably 0.2 or more, and more preferably 0.3 or more. More preferred.
- the average particle size of the water-absorbing resin constituting the composite A contained in the composition of the present invention is preferably from 50 to 1, and preferably from 100 to 900 m, and particularly preferably from 200 to 800 ⁇ .
- the average fiber length of the fibers constituting the composite ⁇ ⁇ contained in the composition of the present invention is preferably 50 to 50, and ⁇ ⁇ ⁇ . It is more preferably 100 to 300,000 ⁇ , and particularly preferably 500 to: LO, 00 0.
- the average fiber diameter of the fibers constituting the composite A contained in the composition of the present invention is preferably from 0.1 to 500 decitex, and more preferably from 0.1 to 100 decitex. More preferably, it is still more preferably 1 to 50 decitex, and particularly preferably 1 to 10 decitex.
- Composite B is a "water-absorbent resin composite comprising one or more water-absorbent resin particles and one or more fibers, wherein the water-absorbent resin particles are substantially spherical, and one or more fibers Is a water-absorbent resin composite in which some of the fibers are embedded in the resin particles and some of the fibers are exposed from the resin particles, and none of the fibers is adhered to the surface of the resin particles. It is. At least one of the bonding fibers bonded to the water-absorbent resin of the composite B is a partially embedded fiber, and does not include the surface-bonded fiber. That is, the essential components of the composite B are the following two types, and the surface adhesive fiber is not a component. 1 Water absorbent resin particles
- the fiber in the composite B can be selected in the same manner as the fiber described in the section of the binding fiber of the composite A.
- the weight fraction of the composite B in the yarn composition of the present invention is usually 0 to 90% by weight. If the amount of the complex B is too large, the fixability of the water-absorbing resin before water absorption tends to be impaired.
- Composite C is a "water-absorbent resin composite comprising one or more water-absorbent resin particles and one or more fibers, wherein the water-absorbent resin particles are substantially spherical, and one or more fibers Is a water-absorbing resin composite in which a part of the fibers are adhered to the surface of the resin particles, and the fibers are neither embedded in the resin particles.
- One or more of the bonding fibers bonded to the water-absorbent resin of the composite C are surface-bonded fibers and do not include partially embedded fibers. That is, the essential components of the complex C are the following two types, and Partially embedded fibers are not components.
- the fibers in the composite C can be selected in the same manner as the fibers described above in the section of the binding fiber of the composite A.
- the weight fraction of the complex C in the composition of the present invention is usually 0 to 90% by weight. If the amount of the complex C is too large, the gel fixability after water absorption tends to be impaired.
- Free fiber is "fiber that is neither embedded nor bonded in a water-absorbent resin”.
- the composition of the present invention may contain one or more free fibers. By adding free fibers, flexibility, softness, water conductivity, water permeability, water diffusivity, air permeability, and the like can be further improved.
- the fibers synthetic fibers, natural fibers, semi-synthetic fibers, inorganic fibers, and the like can be used as in the case of the binding fibers.
- the fiber used is selected according to the purpose of use of the water-absorbent resin composite composition.
- hydrophilic fibers cellulosic fiber such as pulp, rayon, cotton, and regenerated cellulose, and fiber such as polyamide and polyvinyl alcohol are selected.
- Use of such a hydrophilic fiber can enhance water conductivity to the composition.
- hydrophobic free fibers can be used as free fibers.
- polyester-based, polyethylene-based, polypropylene-based, polystyrene-based, polychlorinated-butyl-based, polyvinylidene-based, polyacrylonitrile-based, polyurea-based, polyurethane-based, polyfluoroethylene-based, and polyvinylidene-based fibers are used. You can choose. By using these hydrophobic fibers, water permeability and water in the composition Diffusion can be improved.
- the affinity of the free fiber with the water-absorbent resin or the affinity with the water-absorbent resin composite is not particularly limited.
- the type of fiber used as the free fiber may be the same as or different from the bond and fiber contained in the above-described composite A, composite B or composite C.
- a hydrophilic fiber can be selected as the binding fiber
- a hydrophobic fiber can be selected as the free fiber. If such an embodiment is adopted, the hydrophobic fiber exhibits a function of improving the diffusivity of water between the water-absorbent resin composites. From the viewpoint of blocking prevention, it is also important to select fibers in consideration of the rigidity and diameter of the fibers described later.
- Preferred free fibers for use in the composition of the present invention are those having a fiber length of 50 to 100,000 / m. It is more preferably from 100 to 500,000 ⁇ m, and still more preferably from 500 to 200,000 ⁇ m. If the fiber length is too long, it may be difficult to open the yarn. On the other hand, if the fiber length is too short, the mobility of the fiber itself is large, which may cause a problem such as leakage of the fiber from the yarn.
- the free fibers used in the composition of the present invention preferably have a fiber diameter of 0.1 to 500 decitex, more preferably 0.1 to 100 decitex, and still more preferably 1 to 5 decitex. It is 0 deciters, particularly preferably 1 to 10 decitex. If the fiber diameter is too large, the rigidity of the fiber is so large that not only mixing with the water-absorbent resin composite becomes difficult, but also compression molding becomes difficult, which may be unfavorable for thinning. In addition, it is uncomfortable and uncomfortable for applications such as sanitary products. Conversely, if the fiber diameter is too small, the above-mentioned water conductivity and diffusivity may not be ensured because the fibers are too thin. In addition, the lack of rigidity may prevent the blocking phenomenon.
- the dry weight ratio of the free fiber to the water-absorbent resin is usually 95: 5 to 0: 100, preferably 95: 5 to 5:95. If the ratio of the free fibers is too high, the effect of the water-absorbing resin may not be substantially exerted, and the bulk density may be reduced.
- the free fibers in the compositions of the present invention are usually less than 90% by weight. m. Manufacturing method
- the polymerizable monomer used for preparing the water-absorbent resin particles of the composite A is not particularly limited as long as it provides a water-absorbent resin. It is particularly preferable to use a polymerizable monomer whose polymerization is initiated by a redox initiator. This monomer is usually preferably water-soluble.
- Such monomers are aliphatically unsaturated carboxylic acids or salts thereof.
- unsaturated monocarboxylic acids or salts thereof such as acrylic acid or salts thereof, methacrylic acid or salts thereof; or unsaturated dicarboxylic acids or salts thereof such as maleic acid or salts thereof, itaconic acid or salts thereof
- acrylic acid or a salt thereof and methacrylic acid or a salt thereof, and particularly preferred is acrylic acid or a salt thereof.
- an aliphatic unsaturated carboxylic acid or a salt thereof is preferable as described above. Therefore, as the aqueous solution of the polymerizable monomer, an aliphatic unsaturated carboxylic acid or a salt thereof is mainly used. An aqueous solution as a component is preferred.
- the phrase “having an aliphatic unsaturated carboxylic acid or a salt thereof as a main component” means that the aliphatic unsaturated carboxylic acid or a salt thereof is 50 mol% or more, preferably 50 mol%, based on the total amount of the polymerizable monomer. It means that it is contained at 80 mol% or more.
- a water-soluble salt for example, an alkali metal salt, an alkaline earth metal salt, an ammonium salt and the like are usually used.
- the degree of neutralization is appropriately determined according to the purpose. In the case of acrylic acid, the neutralization degree of 20 to 90 mol% of the carboxyl groups is neutralized with an alkali metal salt or an ammonium salt. Is preferred. If the degree of partial neutralization of the acrylic acid monomer is too low, the water absorbing ability of the resulting water absorbent resin tends to be significantly reduced.
- an alkali metal hydroxide or bicarbonate or the like or a hydroxide such as ammonium hydroxide is preferable.
- An alkali metal hydroxide is preferred. Examples thereof include sodium hydroxide and a hydroxide-bearing realm.
- polymerizable monomers copolymerizable therewith such as (meth) acrylamide, (poly) ethylene glycol (meth) atalylate, and 2-hydroxyxethyl
- alkyl acrylates such as methyl acrylate and ethyl acrylate are copolymerized in an amount not to deteriorate the performance of the resulting water-absorbent resin.
- (meth) acryl means both “acryl” and “methacryl”.
- those that give a water-absorbing resin are not used as a trapping component for aliphatic unsaturated carboxylic acids or salts thereof, but are mainly used as an aqueous solution of a polymerizable monomer that gives a water-absorbing resin. It can also be used as a monomer. (Monomer concentration)
- the concentration of the polymerizable monomer in the aqueous polymerizable monomer solution containing the above-mentioned aliphatic unsaturated carboxylic acid or a salt thereof as a main component is preferably 20% by weight or more, more preferably 25% by weight or more. If the concentration is less than 20% by weight, the water-absorbing resin after polymerization may not have sufficient water absorbing ability.
- the upper limit is preferably about 80% by weight from the viewpoint of taking up the polymerization reaction solution.
- Aliphatic unsaturated carboxylic acids or salts thereof, particularly acrylic acid or salts thereof, may themselves form a self-crosslinked polymer, but may be used together with a crosslinking agent to positively form a crosslinked structure.
- a cross-linking agent is used in combination, the water-absorbing performance of the generally formed water-absorbing resin is improved.
- copolymerizable with the polymerizable monomer Polyvalent compound such as N, N, -methylenebis (meth) acrylamide,
- (Poly) Ethylene glycol poly (meth) acrylates and water-soluble compounds having two or more functional groups capable of reacting with carboxylic acid for example, poly (ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, etc.) Glycidyl ether and the like are preferably used. Particularly preferred among these are N, N, -methylenebis (meth) acrylamide.
- the amount of the crosslinking agent to be used is 0.01 to 1% by weight, preferably 0.01 to 0.5% by weight, based on the charged amount of the monomer.
- polymerization initiator used in the present invention those used in aqueous solution radical polymerization can be used.
- examples of such a polymerization initiator include inorganic and organic peroxides, such as ammonium alkali metal, particularly persulfates such as potassium, hydrogen peroxide, t-butyl peroxide and acetyl chloride.
- a polymerization initiator known as an azo compound can also be used.
- 2,2,1-azobis (2-amidinopropane) dihydrochloride which has a certain degree of water solubility, may be mentioned.
- the polymerization is initiated by the decomposition of the radical polymerization initiator.
- a commonly known technique is pyrolysis.
- polymerization is initiated by adding an unheated polymerization initiator to the monomer of the reaction solution that has been heated to the decomposition temperature of the polymerization initiator in advance, but this also refers to this case. Belongs to the category.
- Preferred as the polymerization initiator used in the present invention is a combination of an oxidizing agent and a reducing agent, which forms a redox system which is somewhat water-soluble.
- oxidizing agents include persulfates such as hydrogen peroxide, ammonium persulfate and potassium persulfate, t-butyl hydroperoxide, cumene hydroperoxide and other ceric salts, permanganate Salt, chlorite, hypochlorite and the like. Of these, hydrogen peroxide is particularly preferred.
- the use amount of these oxidizing agents is from 0.01 to 10% by weight, preferably from 0.1 to 2% by weight, based on the polymerizable monomer.
- the reducing agent is capable of forming a redox system with the oxidizing agent.
- sodium sulfite sodium sulfite such as sodium bisulfite, sodium thiosulfate, cobalt acetate, copper sulfate, ferrous sulfate, L-ascorbic acid or L-ascorbic acid alkali metal salt
- L-ascorbic acid or alkali metal L-ascorbic acid is particularly preferred.
- the amount of these reducing agents to be used is from 0.001 to 10% by weight, preferably from 0.01 to 2% by weight, based on the polymerizable monomer.
- the fiber type and shape are appropriately selected as described above. -It is preferred that the fibers are evenly dispersed as microscopically as possible. In general, fibers tend to form lumps of fibers by entanglement, but the apparent fiber lumps diameter is preferably 20 mm or less, more preferably 10 mm or less, and most preferably 5 mm or less. Needless to say, it is preferable that the fibers are independent of one fiber. Generally, a technique called fiber opening is used to ensure uniformity. In addition, "opening" includes the concept of both defibration and fiberization. The defibration includes tearing a sheet-like material such as nylon into strips or fibers. In addition, fibrillation includes slicing raw cellulose into pulp.
- the production method of the present invention comprises, in a gas phase, a droplet containing a polymerizable monomer and a solvent before and during or during polymerization and a first fiber supplied from a first supply port of a reactor.
- a step of bringing into contact (first step), a step of promoting the polymerization of the polymerizable monomer (second step), and a droplet containing the polymerizable monomer, the solvent and the fiber being polymerized is then fed from the second supply port of the reactor.
- the step of bringing the second fiber into contact with the supplied second fiber in the gas phase (third step) and the step of further promoting the polymerization of the polymerizable monomer (fourth step) are sequentially performed.
- the manufacturing method of the present invention may include steps other than these four steps.
- a specific mode is not particularly limited as long as one or more fibers can be brought into contact with a droplet containing a polymerizable monomer in a gas phase.
- the polymerizable monomer contained in the droplet must be in contact with the first fiber in the first step, before or during polymerization.
- the monomer conversion upon contact with the fiber is preferably in the range of 0 to 80%. It is more preferably in the range of 0 to 70%, most preferably in the range of 0 to 60%. If the conversion is too high, the fibers to be contacted may not be embedded or adhered to the water absorbent resin. At the time of contact with the first fiber, the polymerizable monomer is more preferably undergoing polymerization.
- the droplets may contain a crosslinking agent, a polymerization initiator, and the like.
- the amounts of the crosslinking agent and the polymerization initiator added to the polymerizable monomer are as described above.
- the method for forming the droplet is not particularly limited.
- a redox polymerization initiator is disposed in an aqueous solution of a polymerizable monomer that gives a water-absorbing polymer, for example, an aqueous solution of a polymerizable monomer containing an aliphatic unsaturated carboxylic acid or a salt thereof as a main component.
- the polymerization of the monomer can be started to initiate the reaction, and the reaction mixture during the polymerization containing the monomer and the produced polymer after the start of the reaction can be formed into droplets in the gas phase.
- a method of forming droplets by mixing a second liquid composed of an aqueous solution containing a polymerizable monomer in the gas phase can be mentioned.
- the first liquid and the second liquid are ejected from separate nozzles so that the liquids flowing out of the nozzles cross at an angle of 15 degrees or more and collide in a liquid column state Can be carried out.
- intersection angle between the first liquid and the second liquid flowing out of each nozzle is appropriately selected according to the properties of the polymerizable monomer used, the flow ratio, and the like. For example, if the linear velocity of the liquid is high, the intersection angle can be reduced.
- the temperature of the first liquid is usually from normal temperature to about 60 ° C, preferably from normal temperature to about 40 ° C
- the temperature of the second liquid is also usually from normal temperature to about 60 ° C, preferably Is from room temperature to about 40 ° C.
- the size of the droplets is particularly preferably in the range of 50 to 1,000 m. Spatial density of the droplets in the reactor from 0.1 to 1 0, is preferably 0 0 0 g / m 3. If the upper limit is exceeded, a water-absorbent resin that does not come into contact with the fibers will be produced. Problem arises.
- the gaseous phase gas that provides a reaction field for initiating such polymerization and forming droplets during the progress of polymerization nitrogen, helium, carbon dioxide, and other inert gases are preferred, but air may also be used. .
- air may also be used.
- the humidity in the gas Even when only water vapor is used.However, if the humidity is too low, the water in the aqueous monomer solution evaporates before the polymerization proceeds, and the monomer precipitates out. The speed may drop significantly or the polymerization may stop prematurely.
- the temperature condition of the gas is not lower than room temperature and not higher than 150 ° C, preferably not higher than 100 ° C.
- the direction of gas flow is related to the direction of travel of the liquid column and droplet.
- the formed droplet contacts the first fiber in the first step.
- the number of times of corrosion with the first fiber is not particularly limited. Preferred is when the droplet contacts multiple fibers.
- the first fiber is supplied from a first supply port of the reactor.
- the cross-sectional shape of the first supply port may be any shape such as a circle, an ellipse, and a rectangle, and may have a U-shaped cross-section that is open at the top.
- the supply port may be provided with an opening so as to go around the inner wall of the reaction vessel. In this case, it is preferable that the opening part around the inner wall is provided at the same height (level) of the reaction vessel.
- the number of the first supply ports may be one or plural. For example, a plurality of supply ports having a circular cross section may be provided so as to go around the inner wall of the reactor at equal intervals.
- a guide path for supplying the first fiber to an appropriate position in the reactor is provided before or after the first supply port.
- the space density of the fibers in the reactor is preferably in the range of 0.05 to 1,000 g / m 3 when the fibers are partially embedded in the water absorbent resin. If the upper limit is exceeded, fibers that are not embedded in the water-absorbent resin composite will be generated.If the upper limit is not exceeded, a water-absorbent resin that does not embed the fibers will be generated, and the yield of the water-absorbent resin composite will relatively decrease. Problems arise. In order to supply the fibers as finely and uniformly as possible, it is preferable to supply the fibers as a multiphase flow with the gas.
- the weight ratio of the fiber and the gas supplied as a multiphase flow is preferably 1: 1 or less, and the linear velocity of the gas is preferably in the range of 1 to 50 m / sec.
- the linear velocity of the gas exceeds 50 m / sec, the weight of the reaction field
- the trajectory of the ongoing reaction mixture may be disturbed and sticking to the inner surface of the reactor may be a problem.
- the uniformity of the fiber may not be ensured.
- the temperature of the gas supplied as a multiphase flow within a range that does not significantly inhibit polymerization.
- the temperature is from room temperature to 150 ° C, preferably 10 ° C or less. It is. From the viewpoint of fiber transport, the lower the humidity in the gas is, the better the force s is.If the humidity is too low, the humidity in the reactor is reduced, and the water in the monomer aqueous solution evaporates before the polymerization proceeds, and the monomer is removed. Precipitation may result, resulting in a significant decrease in the polymerization rate or termination of the polymerization in the middle.
- the second step is a step in which the polymerization of the polymerizable monomer contained in the droplet contacted with the first fiber in the first step proceeds.
- the second step is to increase the conversion of the polymerizable monomer when it comes into contact with the second fiber in the third step, compared to the conversion of the polymerizable monomer when it comes into contact with the first fiber in the first step. What to do.
- the polymerization rate of the polymerizable monomer in the droplet is extremely high. Therefore, the polymerization of the polymerizable monomer proceeds in a short time after the droplet comes into contact with the first fiber until it comes into contact with the second fiber. If the droplets come in contact with the first fiber and the second fiber successively while falling, the polymerizable monomer is polymerized during the drop after contacting the first fiber and contacting the second fiber. Progresses.
- a means for accelerating the polymerization reaction may be provided.
- the polymerization reaction may be promoted by applying heat to the droplets by a method such as passing through a heating zone.
- the second step is preferably performed such that the conversion of the polymerizable monomer is increased by 10% to 80%. It is more preferably in the range of 10 to 70%, most preferably in the range of 10 to 60%.
- the conversion rate in each contact field is appropriately determined according to the monomer type, fiber type, and the like.
- the third step is a step of bringing a droplet containing a polymerizable monomer, a solvent, and a fiber being polymerized into contact with a second fiber supplied from a second supply port of the reactor in a gas phase.
- the conversion of the polymerizable monomer when coming into contact with the second fiber is preferably 10% to 90%, more preferably 10% to 80%, and more preferably 10%. More preferably, it is about 70%.
- the polymerizable monomer comes into contact with the first fiber at a relatively low conversion stage. Therefore, as the polymerizable monomer gradually changes to a polymerizable polymer as the polymerization proceeds thereafter, the first fiber is embedded by the polymerizable polymer. In the finally obtained water-absorbent resin composite, the first fibers are fibers partially embedded in the resin particles and partially exposed from the resin particles.
- the polymerizable monomer comes into contact with the second fiber at a relatively high conversion stage. For this reason, even if the subsequent polymerization proceeds, the second fiber is not embedded in the polymerizable polymer, but only adheres to the surface of the polymerizable polymer. Therefore, in the water-absorbent resin composite finally obtained, the second fiber is a fiber partially adhered to the surface of the resin particle without being embedded in the resin particle.
- the second fiber supplied in the third step may be the same fiber as the first fiber or a different fiber. Further, fibers of the same material but having different fiber diameters / fiber lengths may be used. Further, the details of the second supply port for supplying the second fiber can be freely designed similarly to the first supply port. Also, the method and means for supplying the second fiber from the second supply port can be freely selected in the same manner as the method and means for supplying the first fiber from the first supply port.
- the present invention can be efficiently carried out.
- the first supply port and the second supply port are installed at the same height, the first supply port supplies the first fiber upward, and the second supply port supplies the first fiber.
- the present invention can also be implemented by supplying the second fiber downward. All such variations can be adopted as long as the production method of the present invention can be implemented.
- the fourth step is a step in which the polymerization of the polymerizable monomer contained in the droplet contacted with the second fiber in the third step proceeds.
- the water-absorbent resin composite of the present invention comprising the water-absorbent resin particles and fibers can be finally formed.
- a means for accelerating the polymerization may be applied as in the second step.
- the polymerization need not be completed while the droplets are in the gas phase. That is, the present invention includes a mode in which the polymerization is not completed while the droplet is falling in the reactor, and the polymerization proceeds even after the drop.
- the pressure difference between the upper and lower portions of the mesh is preferably 100 to 100,000 Pa.
- the mesh has a belt shape so that the water-absorbent resin composites that are successively deposited can be continuously extracted from the reactor. That is, it is possible to efficiently obtain the deposit by continuously supplying the droplets and fibers to the reactor and continuously extracting the produced water-absorbent resin composite deposit.
- the fibers In order to obtain a greater structure of the composite B, it is preferable to supply the fibers at a stage where the polymerization rate is relatively low (for example, in the range of 0 to 60%). In order to obtain a large amount, it is preferable to supply the fibers at a stage where the conversion is relatively high (for example, in the range of 30 to 90%). Since the water-absorbent resin composites are independent of each other in the sediment, they can be easily opened. For the fiber opening, the fiber opening method described in the description of the fiber can be used as appropriate, but an apparatus and conditions under which the water-absorbent resin is not damaged by a mechanical impact are preferable.
- an additional step may be performed in addition to the above four steps.
- a residual monomer treatment step a surface cross-linking step, and a step of adding additives such as a catalyst, a reducing agent, a deodorant, a human urine stabilizer, and an antibacterial agent to add other functions are added. Is also good.
- the method of treating the residual monomer includes: 1) a method of promoting polymerization of the monomer,
- Examples of the method for promoting the polymerization of the monomer of 1) include a method of further heating the composite of the water-absorbent resin and the fiber, and a method of heating after adding a catalyst or a catalyst component that promotes the polymerization of the monomer to the water-absorbent resin. Irradiating with ultraviolet rays, irradiating with electromagnetic radiation or particulate ionizing radiation.
- the water-absorbent resin composite is heated at 100 to 250 ° C. to polymerize the monomers remaining in the water-absorbent resin composite. .
- the method of adding a catalyst or a catalyst component that promotes the polymerization of monomers to the water-absorbent resin composite is as follows.
- a reducing agent solution may be applied to the water absorbent resin.
- the reducing agent sodium sulfite, sodium bisulfite, L-ascorbic acid, etc. used as a redox polymerization initiator may be used. Usually, these are used as a 0.5 to 5% by weight aqueous solution of the water-absorbing resin. Apply to the composite.
- the amount of the reducing agent applied is preferably 0.1 to 2% by weight based on the dry resin.
- the water-absorbent resin composite provided with the reducing agent is then heated to polymerize the monomer.
- the heating may be performed, for example, at 100 to 15.0 ° C. for about 10 to 30 minutes. This heating lowers the water content of the water-absorbent resin composite, but if the water content is high, it is further dried with a dryer to obtain a water-absorbing material for the product.
- a normal ultraviolet lamp may be used. Irradiation intensity, irradiation time, and the like vary depending on the type of fiber used, the residual monomer impregnation amount, and the like. Is an ultraviolet lamp of 10 to 200 WZ cm, preferably 30 to 120 W / cm, an irradiation time of 0.1 second to 30 minutes, and a lamp-composite interval of 2 to 3 O cm.
- the water content in the water-absorbent resin composite at this time is generally 0.1 to 40 parts by weight, preferably 0.1 to 1.0 parts by weight, per 1 part by weight of the polymer. Department is adopted.
- a water content of less than 0.01 parts by weight or more than 40 parts by weight is not preferred because it has a significant effect on the reduction of residual monomers.
- the atmosphere for irradiating the ultraviolet rays can be used under vacuum, in the presence of an inorganic gas such as nitrogen, argon or helium, or in air.
- the irradiation temperature is not particularly limited, and the object can be sufficiently satisfied at room temperature.
- the water-absorbent resin composite As a method for irradiating the water-absorbent resin composite with radiation, high-energy radiation such as accelerated electrons or gamma rays is used.
- the dose to be applied varies depending on the amount of residual monomer in the complex, the amount of water, etc., but is generally from 0.1 to 100 Mrad, preferably from 0.1 to 50 Mrad. . If the dose exceeds 100 megarads, the water absorption becomes extremely small. If the dose is less than 0.01 megarads, the water absorption capacity and water absorption rate aimed at in the present invention are large, and it is difficult to obtain a particularly small residual monomer.
- the water content of the water-absorbent resin composite at this time is generally 40 parts by weight or less, preferably 10 parts by weight or less, per 1 part by weight of the polymer. If the water content exceeds 40 parts by weight, the effect of improving the water absorption rate is small, and it is not preferable because it has a remarkable effect on the reduction of the unpolymerized monomer.
- Atmosphere when irradiating the composite with high energy radiation The gas may be used in a vacuum or in the presence of an inorganic gas such as nitrogen, argon, helium, or in air. The preferred atmosphere is air. Irradiation in air increases water absorption capacity and water absorption rate and reduces residual monomer in particular.
- the irradiation temperature is not particularly limited, and the object can be sufficiently achieved at room temperature.
- Examples of the method for introducing the monomer of 2) to other derivatives include a method of adding amine, ammonia and the like, and a method of adding a reducing agent such as bisulfite, sulfite and pyrosulfite.
- a method for removing the monomer in 3 for example, a method of extracting with an organic solvent and distilling off the solvent can be mentioned.
- the water-absorbent resin composite is immersed in a water-containing organic solvent to extract and remove residual monomers.
- a water-containing organic solvent ethanol, methanol, acetone or the like can be used, and its water content is preferably from 10 to 99% by weight, particularly preferably from 30 to 60% by weight.
- the higher the water content the higher the ability to remove residual monomers.
- energy consumption in the subsequent drying step increases.
- the time for immersing the complex in the aqueous organic solvent is usually about 5 to 30 minutes, and it is also preferable to employ a means for promoting the extraction of the residual monomer such as moving the complex. After the immersion treatment, it is usually treated with a dryer and dried.
- the residual monomer in the water-absorbent resin can be reduced by heating saturated steam at 110 ° C to 120 to 150 ° C and contacting the composite as superheated steam.
- the remaining monomer is simultaneously vaporized and escapes from the water-absorbent resin. According to this method, both the removal of the residual monomer and the drying of the product can be performed.
- the surface of the water-absorbent resin can be cross-linked with a cross-linking agent for the purpose of improving the water-absorbing performance.
- a cross-linking agent is added to the surface of the powdery water-absorbing polymer particles. It is known that the properties of the resin particles are improved by heating and then crosslinking the surface after imparting an appropriate amount of water, and a crosslinked structure is selectively formed on the surface. It is believed that the shape can be maintained without inhibiting swelling.
- a solution of a surface crosslinking agent is applied to the water-absorbent resin composite.
- the surface cross-linking agent examples include polyfunctional compounds copolymerizable with polymerizable monomers such as N, N, methylene bis (meth) acrylamide, (poly) ethylene glycol bis (meth) acrylate, and (poly) ethylene glycol diglycidyl.
- polymerizable monomers such as N, N, methylene bis (meth) acrylamide, (poly) ethylene glycol bis (meth) acrylate, and (poly) ethylene glycol diglycidyl.
- a compound having a plurality of functional groups capable of reacting with a carboxylic acid group such as ether is used.
- These surface crosslinking agents are usually used in an amount of 0.1 to 1% by weight, preferably 0.2 to 0.5% by weight, based on the water-absorbent resin composite.
- These surface cross-linking agents are diluted with water, ethanol, methanol, or the like so as to be uniformly applied to the entire water-absorbent resin composite, so as to be 0.1 to 1% by weight, particularly 0.2 to 0% by weight. It is preferably used as a 5% by weight solution. It is generally preferable to apply the crosslinking agent solution by spraying the crosslinking agent solution onto the water-absorbent resin composite using a sprayer, or by applying the crosslinking agent solution with a mouth brush. After excessively applying the cross-linking agent solution, the surplus cross-linking agent solution may be removed by squeezing the resin particles lightly with a pressing roll or blowing air to such an extent that the resin particles are not crushed.
- the application of the crosslinking agent solution may be performed at room temperature.
- the water-absorbent resin composite to which the crosslinking agent solution has been applied is then heated to cause a cross-linking reaction to proceed, thereby selectively forming a cross-linked structure on the surface of the water-absorbent resin.
- the conditions for the cross-linking reaction may be appropriately selected depending on the cross-linking agent used, but the reaction is usually performed at a temperature of 100 ° C. or higher for 10 minutes or longer.
- a cross-linked unsaturated carboxylic acid polymer or a cross-linked partially neutralized atarilic acid polymer can be preferably used as the water-absorbing resin.
- additives can be added to the water-absorbent resin composite or the water-absorbent resin composite composition in order to impart a desired function according to the intended use.
- additives include stabilizers for preventing polymer decomposition and deterioration due to the liquid to be absorbed, antioxidants, deodorants, deodorants, fragrances, and foaming agents. Stabilizer) ⁇
- JP-A-63-118375 discloses a method of containing an oxygen-containing reducing inorganic salt and Z or an organic antioxidant in a polymer
- JP-A-63-153060 discloses a method of containing an oxidizing agent.
- JP-A-63-127754 discloses a method of incorporating an antioxidant
- JP-A-63-272349 discloses a method of incorporating a sulfur-containing reducing agent
- JP-A-63-146964 discloses a metal chelating agent
- JP-A-63-15266 discloses a method of containing a radical chain inhibitor
- JP-A-1-275661 discloses a method of containing a phosphinic acid group or a phosphonic acid group-containing amine compound or a salt thereof.
- JP-A-64-29257 discloses a method of adding a polyvalent metal oxide
- JP-A-2-255804, and JP-A-3-179008 describe a method of coexisting a water-soluble chain transfer agent during polymerization. Has been proposed. All of these can be used in the present invention.
- JP-A-6-306202, JP-A-7-53884, JP-A-7-62252, JP-A-7-113048, JP-A-7-145326, and JP-A-7-145263 Materials and methods described in JP-A-7-228788 and JP-A-7-228790 can also be used.
- human urine, human blood, and menstrual stabilizers are sometimes called human urine stabilizer, human blood stabilizer, and menstrual stabilizer, respectively.
- Antimicrobial agents are used to prevent spoilage due to the absorbed liquid.
- antibacterial agents “New development of sterilization and antibacterial technology”, pp. 17-80 (Toray Research Center (1994)), “Antibacterial testing of antifungal agents, evaluation methods and product design”, pp. 128-344 N.T.S (1997)), Japanese Patent No. 2760814, Japanese Patent Application Laid-Open No. 39-179114, Japanese Patent Application Laid-Open No. 56-31425, Japanese Patent Application Laid-Open No. 57-25813, Japanese Patent Application Laid-Open No.
- JP-A-5-9344 JP-A-5-68694, JP-A-5-161671, JP-A-5-179053, JP-A-5-269164 Gazette, JP 7 It can be appropriately selected and those introduced in 165981 JP.
- Examples include alkylpyridinium salts, benzalkonium chloride, chlorhexidine dalconate, zinc pyridione, and silver-based inorganic powder.
- Representative examples of quaternary nitrogen-based antibacterial agents include methylbenzetuium chloride, benzalkonium chloride, dodecyltrimethylammonium bromide, tetradecyltrimethylammonium bromide and hexadecyltrimethylammonium bromide. Can be mentioned.
- Heterocyclic quaternary nitrogen-based antibacterial agents include dodecylpyridinium chloride, tetradecylpyridinium chloride, cetylpyridinium chloride (CPC), tetradecyl-4-ethylpyridinium chloride, and tetradecyl-4-methyl.
- Pyridinium chloride can be mentioned.
- bis-biguanides include 1,6 1-bis (4-chlorophenol) diguanide hexane, which is known as black hexidine and its water-soluble 1 "raw salt. Particularly preferred is hydrochloride of black hexidine , Acetate and dalconate.
- carbanilides include 3,4,4,1-trichlorocarbanilide (TCC, trichlorocarban) and 3 -— (trifluoromethyl-4,4, dichlorocarbanilide (IRGASAN).
- TCC 3,4,4,1-trichlorocarbanilide
- IRGASAN 3- (2,4-dichlorophenoxy) phenol
- metal compounds include graphite and tin salts such as zinc chloride, zinc sulfide, and the like.
- Rare earth salts of surfactants are disclosed in EP-A-108 191. Rare earth salts of this type include straight-chain C10-18 alkyls. A lanthanum salt of rubenzen sulfonate can be exemplified.
- deodorants, deodorants, and fragrances are used to prevent or reduce the unpleasant odor of the absorbed liquid.
- Deodorants, deodorants, and fragrances are described in, for example, “New Deodorants and Deodorants, Technologies and Prospects” (Toray Research Center (1994)), Japanese Unexamined Patent Publication No. Sho 59-1505448 Japanese Unexamined Patent Application Publication No. Sho 60-158'861, Japanese Unexamined Patent Application Publication No. Sho 61-181, No. 52, Japanese Unexamined Patent Application Publication No. 1-153748, Japanese Unexamined Patent Publication No.
- JP-A-2-12442 JP-A-1-2655956, JP-A-2-411155, JP-A-2-253847, JP-A-3-2
- deodorants and deodorants include iron complexes, tea extract components, and activated carbon.
- fragrances include fragrances (citral, cinamic aldehyde, heliotopin, phorfa, polnylacetate), wood vinegar, paradichlorobenzene, surfactants, higher alcohols, terpene compounds (limonene, binene, camphor, Polneol, eucalyptol, eugenol).
- fragrances neutral, cinamic aldehyde, heliotopin, phorfa, polnylacetate
- wood vinegar paradichlorobenzene
- surfactants higher alcohols
- terpene compounds limonene, binene, camphor, Polneol, eucalyptol, eugenol
- Foaming agent, foaming aid foaming aid
- a foaming agent and a foaming aid can be used together in order to increase the water absorption performance of the water-absorbent resin by making it porous and increasing the surface area.
- the foaming agent and the foaming aid for example, those introduced in “Rubber / Plastic Compounding Chemicals” (Lapper Digest Co., Ltd., 1989, pp. 259-267) can be appropriately selected. Examples include sodium bicarbonate, nitrosyl sulfide, azo compounds, sulfonyl hydrazide and the like.
- the foaming agent is suitably added before or during the polymerization step in the process of producing the water-absorbent resin.
- Human urine stabilizers, human blood stabilizers, antibacterial agents, deodorants, and fragrances can be added in the water-absorbent resin composite production process, water-absorbent resin composite composition production process, and water-absorbent article production process. is there. Of course, it can be applied to the fiber in advance.
- the composition of the present invention is prepared by mixing and dispersing a separately prepared complex B and / or complex C and / or free fiber with respect to the above-mentioned complex A as produced ( Post-mixing method)
- it is prepared by a method of simultaneously obtaining the composition in the polymerization step of the complex A (simultaneous mixing method), and then, if necessary, adding a treatment such as consolidation.
- a water-absorbent resin composite composition mixed with the above composition can be produced.
- a solid mixing device capable of mixing powders, powder and fibers, or fibers can be used as a mixer. Specifically, this is described in detail in “Chemical Engineering II” (Yoshitoshi Oyama, Iwami Zensho, pp. 196, 229).
- Rotary mixers such as multi-purpose machines, V-type mixers, double-cone mixers, and cubic mixers, screw-type mixers, Ripon-type mixers, rotating disk-type mixers, fluidizing-type mixers And the like.
- the composition of the present invention can be substantially obtained. That is, when the droplets are brought into contact with the fiber at a low polymerization rate, a composite B-containing composition is obtained, and when the droplets are brought into contact with the droplets at a high polymerization rate, a composite C-containing composition is obtained.
- the fibers may be supplied, mixed, and dispersed at the time of producing the water-absorbent resin composite in a manner that does not substantially contact the water-absorbent resin in the progress of polymerization or the water-absorbent resin in the water-absorbent resin composite.
- a composition containing fibers is obtained.
- Consolidation is performed while appropriately adjusting conditions such as pressure, temperature, and humidity.
- a plate press, a roll press, or the like can be used as the press.
- the pressure may be within a range where the water-absorbent resin particles are not broken. If the water-absorbent resin particles break, the broken particle pieces will separate from the fibers and leak from the absorbent product, which is the final product. This will degrade the performance of the article.
- the fibers When heating in the consolidation process, it can be heated to a temperature below the melting point of the fiber used. When heated above the melting point, the fibers bind together to form a network, impairing the function of the composite.
- humidifying during the consolidation process usually humidify using steam.
- the humidification conditions can improve the density of the yarn and the product, and improve the adhesion of the water-absorbent resin particles to the fibers.
- the fiber can be easily opened like the aggregate of the composite A.
- the fiber opening method described in the above description of the fiber can be used as appropriate.
- a solution having a concentration of 1 to 10% by weight was prepared using a solvent capable of dissolving or dispersing the used fibers.
- the amount of fiber retention in the reaction field is calculated by assuming that the fiber moves from top to bottom along the flow of air supplied together as a multiphase flow, and the amount of retention is calculated as the volume of the entire reaction field. By dividing, the spatial density of the fiber in the reaction field was calculated.
- a beaker containing about 150 g of methanol was placed so that the liquid level of methanol was located at the position where the fiber was introduced, and droplets of the reaction mixture that had started polymerization were formed in the gas phase. Approximately 1 g of polymerization-in-progress droplets were allowed to fall into the methanol in the beaker.
- the polymerization rate was calculated from the respective weights according to the following formula (Mp is the weight of the polymer, Mm is the weight of the monomer).
- the fibers are separated using an agent that selectively decomposes the water absorbent resin in the composite, and the fiber weight was determined by weighing.
- the weight of the water-absorbent resin composite A obtained in 3) was defined as Wc.
- This water-absorbent resin complex A was charged into a 50 ml closed glass container, and an aqueous solution obtained by dissolving 0.03 g of L-ascorbic acid in 25 g of distilled water was added to swell, and the mixture was swollen at 40 °. C for 24 hours.
- ⁇ Easy worsting, and the water-absorbing resin particles after worsting are hardly damaged.
- ⁇ Worsting is felt, and when the worsting is performed, the water-absorbing resin particles after the worsting are damaged.
- X There is a strong sense of resistance to such an extent that it cannot be worsted, or a strong sense of resistance to worsting.
- a required amount of a physiological saline (0.9% by weight aqueous sodium chloride solution) was prepared in advance.
- the ratio of the binding fiber to the water-absorbent resin in the water-absorbent resin composite is determined in the same manner as in 3.3) above, so that the weight of the water-absorbent resin in the water-absorbent resin composite becomes about 1 g.
- the water-absorbent resin composite was collected and the weight (W1) was measured.
- the weight (W2) of the fibers in the water-absorbent resin composite was calculated from the ratio of the water-absorbent resin to the fibers.
- This water-absorbent resin composite was placed in a 250-mesh nylon bag (20 cm ⁇ 10 cm) and immersed in 500 ml of physiological saline at room temperature for 30 minutes.
- Water holding capacity S of physiological saline was calculated according to the following equation.
- the units of W1 to W3 are all g.
- AUL Water absorption capacity under pressure
- the water-absorbent resin composite was collected so that the weight of the water-absorbent resin in the water-absorbent resin composite was about 0.16 g, and the weight was measured.
- the weight of a cylindrical tube 12 with a wire mesh 11 was measured. These weights are referred to as the weight Sd (g) of the water-absorbent resin composite and the weight Td (g) of the cylindrical tube, respectively.
- the basis weight of the water absorbent resin is P [g / m 2 ]
- the dry weight ratio of the free fiber and the water absorbent resin is F [w / w]
- the densified water-absorbent resin composite compositions produced by the above procedures were evaluated and measured by the following procedures, respectively.
- the densified water-absorbent resin composite composition was cut into 5 cm ⁇ 5 cm, and the thickness of the densified absorbent resin composite composition was measured in accordance with JIS 1-1096 (FIG. 2).
- Thickness (mm) Sample measurement (mm) _ Planck measurement (mm)
- the densified water-absorbent resin composite composition was cut into 5 cm ⁇ 5 cm, the weight was measured, and the bulk density was determined from the following equation. Five samples were measured, and the average value was determined.
- a sample piece 52 was mounted in a heart loop on the horizontal bar grip 51 shown in FIG. 3 so that the effective length of the sample piece was 20 cm.
- L (cm) between the top of the horizontal bar and the lowest point of the loop was measured.
- L is defined as rigidity. Five samples were measured, and the average value was determined.
- a diaper as a water-absorbing article was produced by the following procedure using a densified water-absorbing resin composite and an artificial product.
- a tissue 22 (basis weight 14 g / m 2 )
- a densified water-absorbent resin composite composition 24 water-absorbent resin 300 Fig. 4 shows the order of gZm 2 and size of 10 cm X 40 cm
- tissue 25 (basis weight 14 g / m 2 )
- water-permeable polyester fiber nonwoven fabric 26 (basis weight SS gZm 2 ).
- the absorbent article produced by the above procedure was measured and evaluated by the following procedure.
- the water-absorbent article was cut into a size of 10 cm ⁇ 10 cm (open on all four sides), and the weight was measured. From the weight ratio of the water-absorbent resin in the water-absorbent resin composite, the total amount of the water-absorbent resin was determined.
- a water-absorbent article cut into a standard mesh sieve (inner frame having an inner diameter of 150 mm, a depth of 45 mm, and a mesh of 20) specified in JIS Z 8801 was fixed to the center with a tape.
- the amount of the water-absorbing gel falling off the water-absorbent article when the force acting to rub the water-absorbent article was repeatedly applied was measured by the following procedure.
- a water-absorbent article 31 is placed on a flat surface, and a cylinder 32 with an inner diameter of 40 mm and an open top is attached at the center.
- An ataryl plate 34 (100 ⁇ 100 ⁇ 10 mm, total weight 150 g) in which the through holes 33 are provided at substantially equal intervals was placed as shown in FIG.
- Artificial urine (composition described later) 150 ml was placed in a cylinder, and the water-absorbent article absorbed water.
- the sample was left at room temperature for 30 minutes, and as shown in FIG. 7, 42 was cut off at a distance of 5 cm from the center 41 of the water absorbent article. Measure the weight of the cut part Specified.
- Solution B was prepared.
- the prepared solution A and solution B were mixed using the nozzle shown in FIG.
- the inner diameter of the nozzle in Fig. 8 is 0.13 mm, and five nozzles for each solution are arranged at 1 cm intervals.
- the intersection angle between solution A and solution B flowing out of the nozzle was adjusted to 30 degrees, and the distance to the nozzle tip was adjusted to 4 mm.
- Solution A and solution B were heated to 40 ° C., respectively, and supplied by pumps at a flow rate of 5 m / sec.
- Solution A and solution B merge at the exit of each pair of nozzles, form a liquid column of about 1 Omm each, then form droplets while proceeding with polymerization while in the gas phase (in air, temperature 50 ° C).
- the spatial density of the droplets in the reactor which was estimated from the space capacity of the reactor, the monomer supply amount, and the falling speed of the droplets, was 2 g / m 3 .
- the temperature of the air in the multiphase flow was room temperature, and the linear velocity was 1 OmZ second.
- the polymerization rates at 0.8 m and 1.6 m below the tip of the nozzle were 15% and 40%, respectively.
- the fibers used were pulp with a fiber diameter of 2.2 dtex, a length force of S 2.5 mm, and a water contact angle of 0 °.
- the feed rate was 11.5 gZ each. Estimated from the space capacity of the reaction field, the fiber supply rate, and the fiber falling velocity Spatial density of reaction fields of the fibers was 8 g Zni 3.
- the resin particles were substantially spherical, and were a water-absorbent resin composite containing one water-absorbent resin particle and two or more fibers.
- a part of the fibers is embedded in the resin particles and a part of the fibers is exposed from the resin particles, and at least one of the two or more fibers has at least one fiber.
- the composite was a water-absorbing composite having a structure in which a part of the fiber was adhered to the surface of the resin particle without being encapsulated in the resin particle. (Schematic diagram in FIG. 9, 101 and 102)
- Example 3 The same as in Example 1 except that polyethylene terephthalate (PET) with a fiber diameter of 1.7 decitex, a length of 0.9 mm and a water contact angle of 80 ° was used instead of the pulp used as the fiber To obtain a product. It was confirmed that the product was a water-absorbent resin composite having the same structure as in Example 1. (103 and 104 in FIG. 10) Example 3-Instead of pulp used as fiber, fiber diameter 1.7 is decitex, length is 0.9 mm and water contact angle is Production was carried out in the same manner as in Example 1 except for using nylon at 50 ° to obtain a product. The product was confirmed to be a water-absorbent resin composite having the same structure as in Example 1. (105 and 106 in Fig. 11) Example 4
- PET polyethylene terephthalate
- pulp used as fiber it has the same fiber diameter and length as nylon, which has a fiber diameter of 1.7 dtex, a length of 0.9 mm, and a water contact angle of 50 °.
- Production was carried out in the same manner as in Example 1 except that a fiber mixture having a 1: 1 weight ratio with rayon having an angle of 0 ° was used to obtain a product.
- the product was confirmed to be a water-absorbent resin composite having the same structure as in Example 1. (107 and 108 in Fig. 12)
- Example 1 except that the pulp used as the fiber was polytetrafluoroethylene (PTFE) with a fiber diameter of 1.7 decitex, a length of 0.9 mm, and a water contact angle of 108 ° instead of the pulp used as the fiber.
- PTFE polytetrafluoroethylene
- the product was confirmed to be a water-absorbent resin composite having the same structure as in Example 1. Comparative Example 1
- Example 2 A product was obtained in the same manner as in Example 1 except that the fiber was supplied only from the fiber supply port located 0.8 m below the tip of the nozzle. Observation of this product with a microscope revealed that it was a composition comprising the following two types of water-absorbent resin composites.
- Example 2 A product was obtained in the same manner as in Example 1 except that the fiber was supplied only from the fiber supply port located 1.6 m below the tip of the nozzle. Observation of this product with a microscope revealed that it was a composition comprising the following two types of water-absorbent resin composites.
- Water-absorbing composite having the same structure as in Example 1
- the stainless steel beaker was immersed in a bath temperature of 50 ° C., and with stirring, 0.84 g of 30% hydrogen peroxide solution was added to perform polymerization. After about 1 minute, the maximum temperature was 110 ° C. Thereafter, the substrate was kept in a hot bath at 50 ° C for 2 hours and then cooled to 20 ° C to obtain a water-absorbent resin.
- a one-part spray nozzle was used in place of the nozzle of Example 1, the liquid temperature was maintained at 25 ° C, and the liquid was supplied by a pump so that the flow rate became 40 m / min.
- the monomer solution was dropped in the gas phase (in air, at a temperature of 25 ° C) while the polymerization proceeded as droplets.
- the spatial density of the droplets in the reactor which was estimated from the space volume of the reactor, the monomer supply amount, and the falling speed of the droplets, was 3 g Zm 3 .
- the temperature of the air in the multiphase flow was 25 ° C, and the linear velocity was 10 m / s.
- the polymerization rate of 0.8 m below the tip of the nozzle was less than 1%.
- the fiber used was polyethylene terephthalate (PET) with a fiber diameter of 1.7 dtex, a length of 0.9 mm, and a water contact angle of 80 °.
- the feed rate was 11.5 gZ min.
- the spatial density of the fibers in the reaction field was 8 g / m 3 , which was estimated from the space capacity of the reaction field, the fiber supply amount, and the fiber falling velocity.
- the droplets collide with the fibers in the gas phase to form a water-absorbent resin composite precursor, and the transport part installed 3 m below the tip of the nozzle is collected as sediment on a belt conveyor that is a mesh belt.
- the pressure difference between the top and bottom of the mesh was controlled to be 1.0000 Pa by sucking it under the mesh with a blower.
- the recovered product was placed in an oven at 80 ° C, polymerization of the attached monomer aqueous solution was performed for 30 minutes, and thereafter, hot air treatment was performed at 140 ° C to obtain a water-absorbent resin composite.
- the collected material was sieved to remove free fibers, but the water-absorbent resin was also used as an adhesive between the fibers, and there were virtually no free fibers.
- a product comprising the water-absorbent resin and the fiber was obtained.
- water-absorbent resin composites produced in Examples 1 to 5 and Comparative Examples 1 to 4 water-absorbent resin composite compositions were prepared, and before each densification treatment, each composite and free fibers were prepared. Weight ratio The free weight ratio of free fiber and water absorbent resin was measured. It was considered that this ratio did not change due to the subsequent consolidation treatment. Further, for the densified water-absorbent resin composite composition obtained by compaction treatment of the water-absorbent resin composite composition, the thickness, bulk density, rigidity, and restoration rate were measured.
- an absorbent article was produced using the densified water-absorbent resin composite composition, and the water-absorbent resin detachment rate and the gel detachment rate were measured.
- Table 1 summarizes the results of each measurement and evaluation.
- the water-absorbent resin composite and its composition produced by the method of the present invention are suitably used as industrial materials such as disposable diapers, sanitary materials such as sanitary napkins, and other water-absorbent articles.
- the water-absorbent resin composite and the composition thereof produced by the method of the present invention include JP-A-63-267370, JP-A-63-10667, JP-A-63-295251, JP-A-63-270801, JP-A-63-294716, JP-A-64-64602, JP-A-1-231940, JP-A-1-243927, JP-A-2-30522 Japanese Patent Application Laid-Open Nos. 2-153731, Hei 2-213851, Hei 3-21385, Hei 4-133728, Hei 11-156188, etc. Can be appropriately used according to the purpose.
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Absorbent Articles And Supports Therefor (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
Description
Claims
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US8802799B2 (en) | 2005-09-07 | 2014-08-12 | Basf Se | Neutralization process |
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WO2005037875A1 (ja) * | 2003-10-16 | 2005-04-28 | Mitsubishi Chemical Corporation | レドックス重合法、吸水性樹脂複合体および吸収性物品 |
TWI344469B (en) | 2005-04-07 | 2011-07-01 | Nippon Catalytic Chem Ind | Polyacrylic acid (salt) water-absorbent resin, production process thereof, and acrylic acid used in polymerization for production of water-absorbent resin |
TWI394789B (zh) | 2005-12-22 | 2013-05-01 | Nippon Catalytic Chem Ind | 吸水性樹脂組成物及其製造方法、吸收性物品 |
EP1837348B9 (en) * | 2006-03-24 | 2020-01-08 | Nippon Shokubai Co.,Ltd. | Water-absorbing resin and method for manufacturing the same |
WO2011008204A1 (en) * | 2009-07-15 | 2011-01-20 | Technical Textiles | Ionized performance fabric with antimicrobial/antibacterial/antifungal properties |
US8952116B2 (en) | 2009-09-29 | 2015-02-10 | Nippon Shokubai Co., Ltd. | Particulate water absorbent and process for production thereof |
US8541528B2 (en) * | 2010-02-24 | 2013-09-24 | Basf Se | Process for producing water-absorbing particles |
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JPH0291129A (ja) * | 1988-09-28 | 1990-03-30 | Nippon Shokubai Kagaku Kogyo Co Ltd | 吸水性複合体の製造方法 |
JPH0967403A (ja) * | 1995-06-19 | 1997-03-11 | Mitsubishi Chem Corp | 吸水性複合体およびその製造法 |
JPH09137072A (ja) * | 1995-09-14 | 1997-05-27 | Nippon Shokubai Co Ltd | 吸水性複合体、その製造方法および吸水性物品 |
JPH10113556A (ja) * | 1996-10-09 | 1998-05-06 | Mitsubishi Chem Corp | 吸水性複合体及びその製造方法 |
JPH1193073A (ja) * | 1997-09-17 | 1999-04-06 | Kao Corp | ポリマーと繊維との複合体の製造法 |
WO2000027624A1 (fr) * | 1998-11-06 | 2000-05-18 | Mitsubishi Chemical Corporation | Composite absorbant l'eau, procede de preparation de ce dernier et article absorbant l'eau |
Family Cites Families (2)
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JP2000198805A (ja) * | 1998-11-06 | 2000-07-18 | Mitsubishi Chemicals Corp | 吸水性複合体およびその製造方法 |
JP3895624B2 (ja) * | 2001-03-28 | 2007-03-22 | 三菱化学株式会社 | 吸水性複合体およびその製造方法 |
-
2004
- 2004-04-15 WO PCT/JP2004/005375 patent/WO2004094482A1/ja active Application Filing
- 2004-04-15 CN CNA2004800166162A patent/CN1805975A/zh active Pending
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Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0291129A (ja) * | 1988-09-28 | 1990-03-30 | Nippon Shokubai Kagaku Kogyo Co Ltd | 吸水性複合体の製造方法 |
JPH0967403A (ja) * | 1995-06-19 | 1997-03-11 | Mitsubishi Chem Corp | 吸水性複合体およびその製造法 |
JPH09137072A (ja) * | 1995-09-14 | 1997-05-27 | Nippon Shokubai Co Ltd | 吸水性複合体、その製造方法および吸水性物品 |
JPH10113556A (ja) * | 1996-10-09 | 1998-05-06 | Mitsubishi Chem Corp | 吸水性複合体及びその製造方法 |
JPH1193073A (ja) * | 1997-09-17 | 1999-04-06 | Kao Corp | ポリマーと繊維との複合体の製造法 |
WO2000027624A1 (fr) * | 1998-11-06 | 2000-05-18 | Mitsubishi Chemical Corporation | Composite absorbant l'eau, procede de preparation de ce dernier et article absorbant l'eau |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US8802799B2 (en) | 2005-09-07 | 2014-08-12 | Basf Se | Neutralization process |
EP1940766B2 (de) † | 2005-09-07 | 2019-09-04 | Basf Se | Neutralisationsverfahren |
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US7339016B2 (en) | 2008-03-04 |
US20060079630A1 (en) | 2006-04-13 |
CN1805975A (zh) | 2006-07-19 |
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