MXPA96005993A - Disposable garment absorbed fluid of the cue - Google Patents

Abstract

The present invention relates to superabsorbent polymeric particles being used in a liquid absorbing center of a disposable body fluid absorbing garment, the polymeric particles comprising first polymer particles having a relatively high water absorption rate and second polymer particles having a water absorption rate lower than that of the first polymer particles in 10 seconds or more, the second polymer particles are integrally bonded to the first polymer particles

Description

GARMENT DISPENSES YOU TO SQRBEPQRfl PE FLUIDS FROM THE BODY DESCRIPTIVE MEMORY The present invention relates to a disposable fleece absorbing garment of the body such as a disposable diaper or a sanitary towel. It is well known in a preparation of this type to cover a liquid absorbing center comprising fluffy pulp and superabsorbent polymer particles with a liquid-compatible sheet. It is also well known that superabsorbent polymer particles tend to become viscous and agglomerate with each other in gel blocks, absorb water. These gei-axis blocks prevent the fluids from penetrating into the absorbing center of liquids and can make the body fluids darken, when blocks of gei are formed in the area, the upper surface of the center. One axis of the media to avoid * that the particles of superabsorbent polymers form said gel axis blocks is to disperse the particles of superabsorbent polymer is in this case fibrous material absorbing water axis as spongy pulp, which is used with the polymer particles so that the Dual inelive particles are suitably separated from each other. However, said measure is not practical due to a limitation imposed on a size of the liquid absorbing center. A case may occur in which the ejected polymer particles can not be used so effectively as to achieve an expected effect for the liquid absorbing center. To overcome this problem, it is possible to contemplate mixing * polymer particles having a relatively high water absorption rate with polymer axis particles having a relatively low water absorption rate. For example, the polymer particles of these two types which are different in their water absorption-absorption speeds are mixed together so that a mixture thereof can form a single layer in a liquid absorbing center. However, it may be difficult to mix them together, the polymer particles of these types are of significantly different particle sizes. It is further contemplated to arrange in such a manner that the polymeric particles of these two types can form separate layers in a liquid absorbing center without mixing with each other in which polymer particles (ie, have a relatively high water absorption velocity). The low form forms an upper layer while the particles having a relatively high water absorption axis speed form a lower layer and a fluffy pulp is disposed between these two layers. complex liquids because the polymer particles must be fed back times in the process In view of the problems as described above, a main object of the invention is to prevent superabsorbent polymer particles from easily forming gel blocks into a center absorber of liquids The object previously, according to the inv In this embodiment, a disposable Muido absorbing garment of the body having a liquid absorbing center comprising a mixture of water absorbing fibrous material and superabsorbent polymer particles, and a liquid permeable sheet partially covering the absorbing center of the body, is achieved by means of the shaft. liquids, the axle-absorbent garment absorbeejora shaft fluids of the body being characterized porgue: The polymer particles comprise first particles of polymer has a water absorption time of less than 10 seconds as idenbaba the conditions < - | ue that are given below and according to the polymer axis particles that have a longer water absorption axis time, since the first part of the polymer axis in 10 seconds or more and integral with the first polymer particles: Conditions of measurement for times j water absorption: (1) 25 ml of water in 0.9% saline solution is emptied into a precipitated 50 ml beaker and shaken at 500 rprn. by means of a magnetic stirrer equipped with a rotating element jue has a diameter of 7 inm and a length of 20 inrn; and (2) A gram-axis particle of superabsorbent polymer is emptied into a beaker during stirring and a time required by these polymer particles to absorb the total amount of water in saline is determined by simple sight. Figure 1 is a perspective view showing an axle that can be disposed as an embodiment of the invention with a detached part; Figure 2 is a sectional view taken along the line TI-II in Figure 1; and Figure 3 is a schematic block diagram illustrating superabsorbent polymer shaft particles. Details of the invention will be understood more fully from the following description of a disposable diaper as a specific embodiment of the invention made with respect to the accompanying drawings. A diaper l shown in Figure 1 in a perspective view with a detached part comprises a sheet assuming liquid permeable 2, a waterproof backing sheet 3 and a liquid absorbing center 4 disposed between these two sheets 2, 3. Axial portions of these two sheets 2, 3 extending outward from the entire peripheral edge of the hub 4 are placed one on top of the other and are hermetically joined to the water one with the other .. The diaper 1 is composed longitudinally of a frontal region (frontal body) 6, a posterior region (posterior body 7) and a groin region 8 that extends between these regions (5, 7.

Next to the upper edge 9 of the rear region * 7 and the transversely opposite side edges 10 of the groin axis region 8, an elastic member 13 for opening the waist and elastic members 14 for a pair of leg openings are arranged respectively between the upper ho and the spline blade 2, 3 and are bound under an elastically stretched condition to an inner surface of at least one of these two sheets 2, 3. Opposite lateral edges 16 opposite of the rear region 7 are provided with tape fasteners 15. Figure 2 is a sectional view taken along the line II-II in Figure 1. As shown, the center 4 comprises an upper layer 21, a lower layer 22 and a paper 20 is covered by the upper and lower layers 21, 22. The upper layer 21 has a basis weight of 190 g / a and comprises a mixture of fluff pulp 25 of 90% on weight and terrnoplastic fibers 26 of 10%. The lower layer 2? It has a base weight of 430g /? nS! and comprises 50% by weight fluff pulp, 5% by weight by weight organic fibers and 27% by weight superabsorbent polymer particles by weight. In the lower layer, the polymer particles 27 are distributed between an upper layer 28a and a lower layer 28b. These two layers 28a, 20b respectively comprise a mixture of fluff pulp 25 and the thermoplastic fibers 25. The upper and lower layers 21, 22 are heat-treated so that the thermoplastic fibers 25 can be completely heat-bonded inside. of each layer 21, 22 as well as between the two layers 21, 22 and thus avoid a loss of configuration eg the center 4 as a toe. The thin paper 23 goes to protect such components as the fluff pulp 25 against dispersion and at the same time facilitate the handling of the center 4 during a diaper manufacturing process. It should be understood that thin paper 23 can be selected from center 4, unless necessary. The superabsorbent polymer particles 27 schematically illustrated by Figure 3 on an enlarged scale comprise first polymer particles 27a of a relatively high relative absorption rate and a relatively small particle size and the second polymeric particles 27b bound to the polyrnery particles. 27a and having a relatively low water axis absorption axis velocity and a relatively large particle size. The particle sizes of the polyps 27 particles are on a scale of 0.2 - 0.8 m. The first polymer particles 27a and the second polimeric particles 27b must have a differential water absorption time of 10 or so seconds and the first polyphenolic particles 27a must have * a water absorption time shorter than 10 seconds depending on the temperature of the water. the conditions as described above. Measuring conditions for water absorption time: (1) 25 rnl of water in 0.9% saline are emptied into a 50 nrn beaker and shaken at 500 r.p. . by means of a magnetic stirrer equipped with a rotating element having a diameter of 7 nm and a length of 20 mm. (2) One gram of superabsorbent polymer particles is emptied into the beaker during stirring and a time required for the polimeric particles to absorb the full amount of the salt water is determined visually. The polymer particles 27 with a complex of the polymeric first and second particles 27a, 27b can be obtained, for example, by adding the second polimeric particles 27b to a polymerisation systems of water-soluble ethylenically higher ethylenically monomer to produce the first polyrneck particles 27a. A process for producing the polymetallic particles 27 will be described more specifically. Water-soluble etiienically unsaturated inonorbents include non-ionic monomers such as methacrylate, methacrylamide-2-methylpropanesulonic acid, and alkaline salts thereof., metacplamua, N, Nd? met? lacr? lamiela, 2-hydroxyethyl metacplato, and etiol-rnata-acrylarnide, and an arnino group containing unsaturated monorials such as dietary lamemoethene rnetacrylate, nitrogenated nitrogenated nitroacrylate and d and laminopropylmethacrylate and quaternary compounds axis the same. Two or more of these water-soluble ethylenically more saturated onomeros can be used in the form of a mixture. It should be understood that the methacrylic acid and derivatives thereof can be replaced by acrylic acid and derivatives thereof. These ethylenically unsaturated water-soluble monomers are generally used in a solution of aqueous solution. A reversed phase suspension polymerization is applied to the water-soluble monomeric ethelene monomers and a suitable hydrocarbon is used as the solvent. The hydrocarbon solvent includes an aliphatic hydrocarbon solvent, an alicyclic hydrocarbon solvent and an aromatic hydrocarbon solvent. The aliphatic hydrocarbon solvent includes N-hexane, N-heptane and ligroin. The alicyclic hydrocarbon solvent includes cyclopentane, rnet, cyclopentane, cyclohexane and ethycyclohexane. The aromatic hydrocarbon solvent includes benzene, toluene and xylene. These solvents <The hydrocarbon can be used in the form of a mixture of 2 or more hydrocarbon solvents. During the reversed-phase suspension polymerization, the hydrocarbon solvent is added as a surface-active agent or a protective colloid to a ring-shaped molecule. These tensioacid agents and protective colloid of macromolecules can be used together. The surfactant agent can be selected from those which allow reverse phase suspension polymerization of mono and ethically unsaturated water-soluble, for example, non-ionic surfactants such as fatty acid ester and sorbitol ester. of polyglycrylic fatty acid, sucrose fatty acid ester, sorbitol fatty acid ether, polyoxiet full alkylphenyl ether. Protective colloids of macrocells include ethylcellulose, ethylhydroxyethylcellulose, polyethylene oxide by oxidation, modified polyethylene by rnaleic anhydride, modified polybutadiene with anhydride maleate, EPDM (ethylene-propylene-diene terpolymer) modified with rnaleic anhydride. These nonionic surfactants and protective colloid of acrornollecules can be used with an ammonium surfactant agent such as fatty acid axes, alkylbenzene sulphonic acid, alkylmethyltaupna, sulfuric acid ester of polyalkylene glycol, or sulfonic acid of epoxy. What is polioxieti? An effective amount of surfactant and / or protective colloid * of crosslinkings is generally 0.1-5 wt.% And most preferably 0.2-3 wt.% Aqueous ionically soluble water soluble inonorne solution. For the water-soluble polymeric axis polymerization, suitable water-repelling agents can be used. Such cross-linking agents include: di- or tp-methacrylic acid esters of polyols such as ethylene glycol, propylene glycol, trirnethylolpropane, glycene-polyoxyethylene glycol, polyoxypropylene glycol, polyglycerin; or unsaturated pol esters obtained by the reaction of these polyes with acid such as amino acid and fumaric acid; bis-acp licks such as N, N'-inetiienbisacp lanieja; di- or tri-methacrylic acid steres obtained from the reaction of polyepoxide with rnetacrylic acid; carbarylene esters of dirnetacrylic acid obtained from the reaction of polyisocyanates such as tol or full tolue diisocyanate, hexanthylene dusocyanate with methacrylic acid and hydroxyethy, diallyl starch; allylcellulose, diallyl phthalate; N, N ', N "-trolyl isocyanurate, and divinylbenzene The crosslinking agents also include, for example, diglycidyl ether compounds, halogenoepoxy compounds and isocyanate-based compounds, an effective amount of said crosslinking agents is 0.001 - 5% by weight of monoether et i ionically water-soluble msatur-ado For polymerization reaction any suitable radical axis axis polymerization initiators can be used The initiators include water-soluble ad-i-axis initiators such as potassium persulfate, ammonium persulfate and sodium persulfate, and oil soluble radical initiators such as bezoyl peroxide and azobisisobutyrorutone, an effective amount of these nucleic acids is 0.005 - 1.0 mole% A temperature at which the polymerization is carried out is generally at the scale of 20 - 110 ° C and preferably on the scale of 40 - 80 ° C dispensing from the novelties that will be used.

The commercial water absorbing polymers could be adapted as the superabsorbent polyester particles to be added to the water-soluble unsaturated ethylene-free polymerization system. More specifically, said polymers include water-absorbing polymers containing the iethex such as starch-acrylonitrile-graft copolymer hydrolyzate and neutralized product of alnnion-acrylic acid graft copolymer, saponified product of vinyl acetate-ester copolymer of acrylic acid, partially neutralized product of polyacrylic acid, anhydropium-isobutylene-axle copolymer, and water-soluble, ethiomically unsaturated monomer product. An effective amount of superabsorbent polymers particles to be added to the polymerization system is in the range of 5-50% by weight of the ethylene-soluble water-soluble monomer contained in this system. The water-absorbing polymer particles can be added to the aqueous solution of ethylene-unsaturated water-soluble monomer before the polymerization starts or can be added to the polymerization system after the monomer has been dispersed, or else unsaturated, soluble in water. water in the solvent hydrocarbon shaft. The garment of the present invention includes superabsorbent polyacrylic particles comprising the first polymeric particles having a relatively high water absorption rate and the second polymeric particles having a water absorption velocity lower than that of the first particles. polymeric in 10 seconds or more and integrally joined to the first polymeric particles. With this complex of superabsorbent polyrnepic particles, when the fluids of the body flow towards a layer formed by many polyrnomeric particles being in close contact with each other, a part of the fluids of the body is absorbed by the first polymeric particles located in a surface area. of the layer. As a result, the first polymeric particles inflate and tend to prevent the body fluids from penetrating further downward. On the other hand, the second polymer particles having a relatively high water absorption rate do not swell easily and are provided between the first pollen particles swollen with voids, and the fluids in the body pass through them. The fluids in the body come in contact with the first polyrnec particles that are below the holes and are absorbed by the particles. In this way, the presence of the second poly particles is effective to prevent the stratified superabsorbent polymer particles from forming gel blocks in the < je surface of the lower layer. Therefore, the first polymer particles below the surface area can be used effectively.

Claims (1)

NOVELTY OF I ft INVENTION CLAIMS

1. An executable fluid absorbing body article having a liquid absorber center comprising a mixture of a water absorbent fibrous material and superabsorbent poly-epoxide particles and a liquid-permeable article at least partially covering the absorber center. The liquid disposable garment absorber of the body is characterized in that: the polimeric particles comprise first polishing particles having a water absorption time shorter than 10 seconds as measured under the conditions given below and second particles. polirnericae that have a water absorption time as long as the first pol pollen particles in 10 seconds or more and that are integrally joined to the first polyrnomeric particles: (1) 25% water in 0.9% saline solution is emptied in a 50 nl beaker and shake at 500 rp . by means of a shaft a magnetic stirrer equipped with a rotating element having a diameter 7 axis rnm and a length 20 rnrn; and (2) one gram of superabsorbent pol poly particles is emptied into the beaker during stirring, and a time required for the polyphenolic particles to absorb the salt water amount is determined visually.