CN1041275A - The absorbent structure of band gellant and the absorbing products that contains this structure - Google Patents
The absorbent structure of band gellant and the absorbing products that contains this structure Download PDFInfo
- Publication number
- CN1041275A CN1041275A CN 88106995 CN88106995A CN1041275A CN 1041275 A CN1041275 A CN 1041275A CN 88106995 CN88106995 CN 88106995 CN 88106995 A CN88106995 A CN 88106995A CN 1041275 A CN1041275 A CN 1041275A
- Authority
- CN
- China
- Prior art keywords
- gellant
- weight
- microns
- net
- granule
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Abstract
The present invention relates to be applicable to absorbent structure and absorbability latex agent composition as disposable absorbing products such as diaper, fecal incontinence product and catamenial articles.This absorbent structure comprises the non-brittle granule of hydrophilic fibers material and polymer gel agent.Gellant granule in this structure of selection adding is to have about 400～1680 microns median granularity of quality, and the very big and very little grain amount that preferably it had all remains under certain minimum content.The absorbent structure that use has the gellant granule of such particle property to make has unexpected high absorbability, and gellant wherein can use to such an extent that produce effect very much and effective percentage very.
Description
Vast expanse of whiteness relates to the fibrous reticular structure that is applicable to the body fluid that absorbs discharge, also relates to the absorbability latex agent composition that is specially adapted to this class formation.This structure can be incorporated into disposable absorbing products, such as sanitary towel, and baby diaper, adult's fecal incontinence pad etc.
By the coma that twines is that the absorbent structure that fleece constitutes is known in prior art.This structure promptly can be passed through absorption mechanism (at this moment, self has absorbed liquid fibrous material) and also can absorb the liquid such as the body fluid of discharging by wicking mechanism (at this moment, liquid is disperseed and is stored in the space between the fiber).A kind of method of improving the absorbent properties of this fiber net structure is to introduce so-called super-absorbent polymer therein, and it absorbs liquid and forms swollen hydrogel material.The hydrogel that generates can keep the liquid of body fluid of picture discharge and so in its structure.This class absorbent structure of introducing the formation hydrogel material with given shape (comprising fibrous) in fleece is disclosed in the United States Patent (USP) 4,610,678 of Weisman that JIUYUE in 1986 was published on the 9th and Goldman.
Granularity and the structural form granulous, that form the polymer (being gellant) of hydrogel that join in the absorbent structure can change in wide range.For example, above-cited United States Patent (USP) 4,610,678 points out that the particulate granularity of gellant that joins in this absorbent structure can be from about 30 microns to about 4 millimeters.Yet, in the business practice of reality, the gellant granule that in the absorbent cores of disposable diaper, uses, often be irregular, but its structural form is not very elongated, granularity is from about 45 microns to about 850 microns, and its median granularity of quality is from about 200 microns to 370 microns.For industrial hygiene and the consideration that is easy to make, generally select the granule of this shape and granularity for use.
Some gellant material that can buy is further manufactured the granule that is made of more short grained agglomerate, because in the process of and packaging operation synthetic at gellant, bigger agglomerate ratio is easier to dispose.But, it is believed that in the process of the disposable absorbent article that this agglomerate is joined manufacturing in industrial operation and in the process of this goods of later use, it has fragmentation to a certain degree.Therefore, in fact, the graininess gellant that is contained as this series products of diaper is perhaps than providing the gellant agglomerate that is used for making diaper smaller slightly with raw material form originally.
The gellant granule that no matter is used in the known absorption structure has which type of granularity and shape, and the general gellant all chemical fibre component than the essential part that constitutes structure is more expensive.Therefore, often to handle dexterously with adjusting being used for making material, structural form and the method for this absorbent structure, in order that make effective absorbability of the gellant material of using in the absorbability of absorbent structure and this structure reach maximum.In this way, the gellant of minimum can be used, and the absorbent properties target of expecting can be realized simultaneously.This so can make the production cost of absorbent structure reach minimum.
If in fact constantly need to improve the absorbent properties of absorbent structure, so, target of the present invention just provides the structural form of a class absorbent structure, and the effective capacity of the absorbability of its structure and gellant wherein can both be improved.
Another target of the present invention be by the particle size distribution of regulating and control the gellant material of using in the absorbent structure simply absorbability and gellant efficiency improvement are provided this class absorbent structure.
Another target of the present invention provides a kind of latex agent composition, and the particle property of said composition is controlled and is particularly suitable for to join in this class absorbent structure.
Another target of the present invention provides such as diaper, the physical training disposable absorbent article with trousers, fecal incontinence liner, sanitary towel etc., and these goods have used this class to have the absorbent structure that has improved absorbent properties to absorb core as it.
In one embodiment of the invention, stipulated to be applicable to the concrete pattern of the absorbent structure of disposable absorbent article.This class formation comprises by about 40～95%(weight) water-absorption fiber structure and about 5～60%(weight) non-fiber, the net that polymer gel agent non-brittle, that can form hydrogel constitutes together.The balanced gel amount of this polymer gel agent equals the synthetic urine of about 20 grams of every gram gellant at least.And these gellant granules have such particle size distribution, so that its median granularity of quality is about 400～1680 microns.No more than about 16%(weight preferably should be arranged) its granularity of granule less than 200 microns, and no more than about 16%(weight should be arranged) granule, its granularity is greater than 1410 microns.Gellant granule self is dispersed in the middle of the hydrophilic fibers that constitutes net fully.The mesh structure that obtains has about 0.06～0.3 gram per centimeter
3Density range.
In another example of the present invention, pointed out to be specially adapted to the absorbability latex agent composition of the netted structure of fibrous absorbability.This compositions comprises many non-fibrous, non-brittle gellant material granules, wherein, these many granules have with join aforementioned absorbent structure in the identical particle property of granule.Be used for forming the particulate gellant material of this class and comprise about 50～99.999%(mole) polymeric, the monomer and the about 0.001～5%(mole that contain undersaturated polymerizable acidic group) cross-linking agent.This its degree of neutralization is at least about 50% by the neutral gellant material of part, and gel content is at least the synthetic urine of about 20 grams of every gram gellant material.
In another example of the present invention, pointed out to have improved the absorbing products of absorbent properties.These goods include the liquid-tight backing of one deck, the plane materiel of one deck transflective liquid and the absorbent cores between backing and plane materiel.Absorb the netted structure of absorbability that core includes a kind of type as hereinbefore.
The accompanying drawing that provides has later been represented the cutaway view of disposable diaper, and this is a kind of version of using on a selective basis for absorbing products.
Absorbent structure of the present invention is net or felted thing, and they comprise fibrous and non-fibrous component, and latex agent composition of the present invention then only contains non-fibrous component.For purpose of the present invention, " fiber " and " fibrous " these two terms refer to the custom design of " specific " material, and the draw ratio of this certain material is approximately greater than 10.In contrast, " non-fibrous " granule is meant that its draw ratio is similar to or less than 10 material.
In first of one examples of series, the present invention relates to comprise the absorbent structure of the fiber mesh material of the non-fibrous particle that contains the absorbability gellant material.The key component of the netted structure of these absorbabilitys comprises hydrophilic fibrous material.For purpose of the present invention, if the body fluid of water or aqueous be easy to be distributed on the surface of fiber (and do not consider fiber in fact whether the absorption liquid body or do not form gel), then fiber is " hydrophilic ".Used hydrophilic fibers average diameter is about 1～200 micron.The average diameter of these hydrophilic fibers is preferably about 10～100 microns.In fact, all join the hydrophilic fibers in this class formation, and the fibre length that is at least 1 millimeter is preferably arranged.
Kind for the hydrophilic fibers material that uses in this class formation of the present invention is not vital.The hydrophilic fibers of any kind of that is suitable in habitual absorbent products also is applicable in herein the absorbent structure.The example of hydrophilic fibers material comprises cellulose, modified cellulose, artificial silk, polyester (as polyethylene terephthalate (DACRON)), hydrophilic nylon (HYDROFIL) etc.
The hydrophilic fibers that is suitable for also comprises the hydrophobic fiber that carried out hydrophilicity-imparting treatment with hydrophilizing agent.This fibrid comprises the thermoplastic fibre through surfactant processing or white carbon processing that is for example made by polyolefin (as polyethylene or polypropylene), polyacrylic acid, polyamide, polystyrene, polyurethane etc.In fact, the hydrophobic fiber of hydrophilicity-imparting treatment, himself water absorption is not good, when therefore in traditional absorbent structure, using, can not provide enough absorbabilities to net, but because its wicking properties is good, and be applicable in the absorbent structure of the present invention.This is because in the structure herein, the wicking properties of fiber is much more important than the absorbability of fibrous material self.
Because the reason on availability and the price generally preferentially selects for use cellulose fibre as cancellated hydrophilic fibers component here.Wood pulp cellulose preferably.
Perhaps be the cellulose fibre that useful especially other cellulosic fibre material has starching, twisting and curls in some absorbent structure herein, its available cross-linking agent makes cellulose fibre crosslinked and make in taking place.For example, at the United States Patent (USP) 3,224,926 of the nineteen sixty-five Berna-rdin that announces of December 21 days; The United States Patent (USP) 3,241,553 of the Steiger that on March 22nd, 1966 announced; The United States Patent (USP) 3,440,135 of the Chung that on April 22nd, 1969 announced; The United States Patent (USP) 3,658,613 of the Steiger that on April 26th, 1972 announced; All disclose this universal fiber in the people's such as Sangenis of the United States Patent (USP) announcement on July 12nd, 3,932,209 and 1977 of the Chatterjee that on January 13rd, 1976 announced the United States Patent (USP) 4,035,147, all these patents all are incorporated herein by reference at this.
The starching, twisting, the curling cellulose fibre that are used as a kind of good especially type of hydrophilic fibers component herein in the netted structure of absorbability comprise with for example C
2～C
8Dialdehyde carry out internally crosslinked cellulose fibre, though this fibrid is in the state of relative dehydration.Can be according to amount of twist (at least 4.5 sth. made by twisting joints of every millimeter dried fiber of its dried fiber and wet fiber, when humidity at least every millimeter to lack 0.5 and twist with the fingers joint, when moist preferably every millimeter have an appointment at least 3.0 twist with the fingers joint) and according to its fluid retention characteristic (on average the isopropyl alcohol hold-up is less than 30%; Average hydropexis amount is 28～50%) determine this fibrid.In european patent application of announcing on January 7th, 1,988 251,676 and the european patent application of announcing on January 13rd, 1,988 252,650 this starching, twisting, curling cellulose fibre there is more detailed narration.The patent application of these two parts of announcements all is with the name application of Procter Gamb-le company, and all is hereby incorporated by.
The hydrophilic fibers component of this structure generally accounts for about 40～95%(weight of this structure herein), be more preferably about 60～95%(weight).The hydrophilic fibers component preferably accounts for about 70～90%(weight of this construction weight).This ratio of hydrophilic fibers material has comprised the weight (if therein use) of hydrophiling auxiliary agent.
Here second of this absorbent structure kind of key component comprises the granule of dispersive, non-fibrous, non-brittle particular types polymer gel agent.This base polymer gellant is such some materials, when the fluid (being liquid) of it and water or body fluid and so on when contacting, can absorb this class fluid and forms hydrogel.By this way, the granule of polymer gel agent can receive and maintain the fluid that enters this absorbent structure, absorbability and/or the improved fluid retention performance strengthened is provided just for thus this structure.
It is polymeric material water-fast, lightly crosslinked, the neutral formation hydrogel of part substantially that used polymer gel agent granule generally comprises a kind of.This base polymer material can be by polymerisable, undersaturated, as to contain acidic group monomer preparation.Such as, this class monomer comprises alkene class unsaturated acids and the anhydride that contains at least one carbon-to-carbon alkene double bond.More particularly, this class monomer can be selected from alkene class unsaturated carboxylic acid and anhydride, alkene class unsaturated sulfonic acid and their mixture.When polymerization, this class monomeric unit will account for about 50～99.999%(mole of gellant material), preferably about 75～99.99%(mole).
The suitable unsaturated acid monomer that is used for preparing the used polymer gel agent of the present invention comprises the people's such as Brandt/Goldman/Inglin that on March 31st, 1987 announced United States Patent (USP) 4,654, its of application on June 10th, 039 and 1987 permitted published application book 060 again, listed material in 718, these two pieces all are incorporated herein by reference at this.The monomer of using on a selective basis comprises acrylic acid, methacrylic acid and 2-acrylamido-2-methyl propane sulfonic acid.Acrylic acid itself is particularly useful for making the polymer gel agent material.
In the polymer gel agent that forms hydrogel, the polymers compositions that is made by undersaturated acidiferous monomer can be grafted on the polymer chain of other kind, on starch or cellulose.It also is good especially that this acrylic acid-grafted starch material is used for herein.
The polymer gel agent of preferentially selecting for use that can prepare from the monomer of customary type comprises acryionitrile grafted starch, the acrylic acid grafted starch of hydrolysis, polyacrylate, copolymer-maleic anhydride and their compositions.Good especially is polyacrylate and acrylic acid-grafted starch.
Regardless of the essence of the main polymers compositions of the polymer gel agent of formation hydrogel used in the absorbent structure here, this class material generally will be lightly crosslinked.Crosslinkedly make that the polymer gel agent of used in the present invention formation hydrogel is water insoluble basically, therefore, the crosslinked gel content that has just partly determined the hydrogel that generates by used polymer gel agent and can extractive polymer property.The cross-linking agent that is suitable for is known in prior art, and it for example comprises detailed disclosed material in the people's such as Masuda that announce on February 28th, 1978 the United States Patent (USP) 4,076,663, and this patent is hereby incorporated by.The cross-linking agent of preferentially selecting for use is the diester or the polyester of unsaturated monocarboxylic or polycarboxylic acid and polyhydric alcohol, bisacrylamide and diallylamine or triallylamine.Good especially cross-linking agent is N, the triacrylate of N '-methylene-bisacrylamide, trimethylolpropane and triallylamine.General cross-linking agent can contain about 0.001～5%(mole of the formation aquogel polymer material of gained).Be more preferably, content of crosslinking agent is about 0.01～3%(mole of the polymer gel agent of used here formation hydrogel).
Operable polymer gel agent lightly crosslinked, that form hydrogel is generally used with the neutral form of part in these structures of the present invention.Be purpose of the present invention, when having the 25%(mole at least), preferably have the 50%(mole at least) the monomer that is used for forming polymer be when containing the acidic group monomer, can think that this class material is that part is neutral with salt-forming cation is neutral.The salt-forming cation that is suitable for comprises alkali metal, ammonium, replacement ammonium and amine.The monomeric percent of acidic group that contains that is neutralized in the used total monomer is considered to " degree of neutralization " here.Degree of neutralization preferably is no more than 98%.
Used polymer gel agent material must have the fluidic ability that is absorbed in the absorbent structure to be run into than higher in this absorbent structure.The absorbability of this class material can be come quantitatively by " gel volume " of the selected polymer gel agent of the present invention.
For the purposes of the present invention, can use the amount of the synthetic urine that is absorbed by any given polymer gel agent to define gel volume, and specification turn to the gram number of the synthetic urine of every gram polymer gel agent absorption.Can measure the gel volume of representing with synthetic urine by the suspension that about 0.1～0.2 part of dry polymeric gellant to be measured and about 20 parts of synthetic urine are made.With this suspension at room temperature, under demulcent stirring, keep time enough,, make to reach swelling equilibrium such as about 1 hour.Calculate the gel volume that the synthetic urine that absorbs with every gram polymer gel agent restrains the polymer gel agent that numerical table shows with the method that more is described in detail in one joint of method of testing in the back according to the weight fraction of polymer gel agent in the suspension with by the ratio of the liquid volume of discharging in the hydrogel that forms and the cumulative volume of suspension then.
These structures of the present invention particularly will be used in diaper, adult's fecal incontinence liner or physical training with those structures in the trousers, generally will use gel volume to be at least about those polymer gel agent of the synthetic urine/gram polymer gel agent of 20 grams.When by cellulose fibre (as wood pulp cellulose) when constituting this structure, be expected the polymer gel agent of using gel volume higher, that is to say that gel volume is between the synthetic urine/gram gellant of about 25～60 grams.
The structure that constitutes by the cellulosic fibre material of some kind (starching, twisting and the curling cellulose fibre narrated such as the front).If use the low slightly gellant of gel volume, when absorption fluids, in fact may be more efficiently so.The general lower gellant of gel volume tends to form the general higher hydrogel (United States Patent (USP) 4 that intensity is quoted by the front of gel strength, 654,039 and the method narrated in the published application 060,718 again of the U.S., come quantification with the hydrogel modulus of shearing).Therefore, in the structure herein, hydrophilic fibers is starching, twisting, curling cellulose fibre, preferably can use the polymer gel agent of the synthetic urine/gram gellant of about 20～35 grams of gel volume.
But another feature of useful especially polymerization gellant is related to the extracting polymer content that exists in the absorbent structure herein in the material of this formation hydrogel.Can be by allowing the sample of the polymer gel agent material that forms hydrogel contact the one sufficiently long period (for example at least 16 hours) and make it to reach extraction equilibrium with the synthetic solution of urinating, filter out the hydrogel of formation then from the supernatant, measuring at last in the filtrate that the content of polymer measures can extractive polymer content.In aforesaid United States Patent (USP) 4,654,039 and U.S. published application 060 again, but also stated the concrete grammar of measuring extracting polymer content in the polymer gel agent of using herein in 718.Useful especially polymer gel agent material in the structure herein, but its no more than polymer gel agent of balance extracting content weight in synthetic urine about 17%, preferably no more than about 10%
A basic feature of the present invention is to use non-fibrous, the non-brittle above-mentioned polymer gel agent granule with certain particle size characteristic in herein the structure.Particularly, have been found that the polymer gel agent when generally being added in this class absorbent structure greater than the particulate form of habitually practise so far, can realize in the ability of absorbent structure and the absorbent structure there being the ability of effective gellant and exceed unexpected improvement.In general, supplying with the bigger gellant particle requirement of this granularity uses one or more to eliminate or minimizing and hydrophilic fibers are introduced in the manufacturing or the process technology of less, the thinner gellant amounts of particles in this absorbent structure simultaneously.The upper limit to the gellant granularity has also been made regulation, because the granularity of too big gellant sees it is undesirable from the aesthetic standard of consumer.
Particularly, the present invention requires to use the median granularity of quality through selecting in this absorbent structure, and the polymer gel agent of certain particle deviation is preferably arranged with median granularity of quality.Be purpose of the present invention, granularity is defined as the particulate size of gellant by sieve analysis mensuration.For example, say in principle, being the granule that stays on 710 microns the sieve is considered to have the granularity greater than 710 microns at sieve aperture, is that to stay sieve aperture be that granule on 500 microns the sieve is considered to have 500～710 microns granularity to have passed through sieve aperture be that the granule of 500 tm screen is considered to its granularity less than 500 microns for 710 microns sieve and passed through sieve aperture.
Have again, be purpose of the present invention, given sample or a large amount of particulate median granularity of quality of gellant are defined as sample or the granularity when gellant is divided into equal two parts by quality in a large number, in other words, the granularity that the sample of half weight or gellant are arranged is greater than median granularity of quality, second half then granularity less than median granularity of quality.For example, be that then the median granularity of quality of gellant particle sample is 500 microns on 500 microns the sieve if there is the sample of half weight to stay sieve aperture.The general granularity standardizition that adopts a kind of standard (will stay on probability paper or the cumulative percentage of the particle sample by given sieve aperture is mapped to screen size) comes the quality measurement median particle, at this moment, 50% mass value is not equivalent to the screen size of Unite States Standard testing sieve.This class figure also is commonly used to be determined near the particle size distribution of mass median.
The polymer gel agent granule that uses in absorbent structure of the present invention must have from about 400～1680 microns median granularity of quality.The scope of the median granularity of quality that this class granule is preferentially selected for use is about 400～1190 microns, and no more than about 16%(weight is arranged simultaneously) this class gellant granule have granularity and no more than about 16%(weight less than 200 microns) this class granule have granularity greater than 1410 microns.The median granularity of quality scope that gellant granule of the present invention is more preferentially selected for use is about 400～700 microns, and no more than about 16%(weight arranged simultaneously) this class gellant granule have granularity less than 200 microns, no more than about 16%(weight) this class granule have granularity greater than 1200 microns.Better again situation is, the gellant granule that uses in this structure has about 410～650 microns median granularity of quality, no more than about 16%(weight is arranged simultaneously) the particulate granularity of this class less than 210 microns, no more than about 16%(weight) the particulate granularity of this class greater than 1000 microns.Best situation is that the particulate median granularity of quality of gellant is about 420～600 microns, and no more than about 16%(weight is arranged simultaneously) grain graininess less than 220 microns, no more than about 16%(weight is arranged) grain graininess greater than 900 microns.
In aforesaid qualification, can further determine the particulate particle property according to qualifications of the gellant that uses herein by means of the standard sieve analysis to median granularity of quality and particle size distribution.Use typical sieve analysis,, measure and stay or/and pass through the percetage by weight of the sample of each sieve with the sieve that sample perhaps many gellant granule order is successively decreased by one group of screen size.For example american society for testing and materials (ASTM) has determined to carry out the standard method of this sieve analysis.A kind of such method has been used Ro-Tap test sieve shaker (manufacturing of W.S.Tyler company) and bushing screen (trade mark is U.S.Sieve Series or Tyler Stand-ard Sieve Series).To with the particulate particle size distribution of this technical measurement very detailed narration being arranged, this book is hereby incorporated by reference document at 21-13 to the 21-19 page or leaf of Perry ' s Chemical Engine-ers ' Handbook the 6th edition (McGraW-Hill books company 1984 publish).
To the gellant sample that the present invention uses on a selective basis and more uses on a selective basis, quote as follows with the particle size distribution characteristics that typical 5 sieve ASTM standard analytical processes are measured:
Screen size U.S. series Tyler distributes according to qualifications and distributes more according to qualifications
(micron) substitutes the sieve suitable label of label (weight %) (weight %)
1410 do not pass through 12 orders＜0.1 0～0.05 by No. 14
1190 do not pass through 14 orders＜1.0 0～0.5 by No. 16
841 do not pass through 20 order 10-35 15～25 by No. 20
297 do not pass through 48 orders＞50 60～70 by No. 50
149 do not pass through 100 orders＜15 10～14 by No. 100
149 pass through No. 100 by 100 orders≤5 1～3
The process technology of using when making gellant by being controlled at can make it to reach or approaching required particle size distribution by telomerized polymer gellant granule.This often comprises polymerization, drying, cutting, grinding and/or the coalescent condition that changes and monitor gellant.How no matter make,, just need carry out the further processing as sieving, make the grain fraction of gellant drop on that part of granule outside the particle size distribution of aforementioned requirement to remove the meeting that may exist in case made the granule of gellant.Want to make the big granule of those granules that the gellant polymerization-drying-cutting technique than common employing is made, a best techniques is to make smaller particles be agglomerated into bigger agglomerate.Therefore can use coalescence technology to improve the particulate median granularity of quality of gellant, the granule that is in coalescent form that is applicable to this structure so also just is provided.In prior art, coalescence technology is known, and it can comprise also can be not included in the coalescing medium that uses the moisture content additive in the less gellant granule or use binding agent or other type.
No matter whether the gellant granule that uses in this absorbing structure be coalescent form, all should be non-brittle.Be purpose of the present invention, if a kind of granule, its degree of stability is enough to resist the power that run into and not broken and be split into granule than small component excessively in habitual absorbent structure manufacturing and/or use, so this granule is exactly non-brittle.This means that gellant granule of the present invention should be stabilized to and be enough to not be broken into more short grained degree, promptly can not allow the particles coalesce body that obtains fall before the swelling outside the granularity limited range of front defined.
The amount that joins the satisfactory polymer gel agent of particle size distribution in the absorbent web structure of the present invention is equivalent to about 5～60% of this construction weight.If being less than about 5% ability that this structure will be kept by the aqueous body fluid that structure absorbed, the gelling dosage that uses diminishes.And gelatinization agents content is higher than such as about 60%(weight) more than, even be higher than about 40%(weight) time, it is believed that the predictive role that uses general bigger gellant granule to improve absorbability and effective gellant ability will reduce.Therefore, the best about 10～40%(weight of absorbent structure for this reason of gellant granule).
Except the hydrophilic fibers and polymer gel agent component of necessity, this absorbent structure also can comprise various optional materials.For example, this optional material can comprise fluid distribution auxiliary agent, antimicrobial, PH regulator, spice etc.If there are these optional components to exist, about 30%(weight of general no more than the structure of its content).
Can use any providing to form the method for net or technology manufacturing by fiber and non-fibrous gellant grains of composition and contain the hydrophilic fibers that is necessary and this absorbent structure of polymer gel agent granule component.In a kind of like this fiber/particle compositions, the gellant granule should fully be dispersed between the hydrophilic fibers that forms net.For the purposes of the present invention, if there is no one gellant granule only is to be in contact with one another and so tangible situation that do not contact with perhaps many hydrophilic fibers to each other, and so, the gellant granule is exactly that " fully disperseing " is between hydrophilic fibers.This preferably means, do not have in this absorbent structure any zone or position (for example 1 cubic centimetre or bigger zone or position) content of gellant therein surpasses 60% limit of front defined.
In this netted structure, polymer gel agent granule must be fully decentralized, but its distribution can be also can be uneven uniformly.Particularly, in this cancellated some position or zone, the content of gellant can be higher than other positions or the zone of this structure.In a such example, at the Concentraton gradient that can exist gellant along this thickness of structure dimensional directions, accepting fluidic body structure surface or close surface, the concentration of gel is minimum, and in the opposite one side of thickness direction or near this place, the concentration of gellant is the highest.
Aspect the absorbent properties of the absorbing products that determines this structure and this structure of use, the density of this absorbent structure has certain importance.The density of this absorbent structure is generally about 0.06～0.3 gram per centimeter
3, more preferably about 0.09～about 0.22 gram per centimeter
3The typical unit weight of this absorbent structure is about 0.02～0.12 gram per centimeter
2
The density value of this structure can be calculated by unit weight and slide calliper rule.Under the qualification pressure of 0.137 pound/square inch (0.94 kPa), carry out kind of calliper.Density and unit weighs value have comprised the weight that forms hydrogel particle.In the scope of total, it is uniform that the density of this structure need not.In the density range of defined, structure of the present invention can contain higher relatively and relatively low position or the zone of density of density in front.
Can apply the shop method by air-flow the mixture of hydrophilic fibers and the particulate substantially dry of polymer gel agent is made absorbent structure of the present invention, as if wishing or need that the net that makes can carry out compacting.In the United States Patent (USP) 4,610,678 of Weisman that JIUYUE in 1986 was announced on the 9th and Goldman the method is had explanation more fully, this patent is hereby incorporated by reference document.
As United States Patent (USP) 4,610,678 is pointed, and the air-flow that makes of the method net that applies the shop preferably includes not agglutinating substantially fiber thus, and preferably its water content is equal to or less than 10%.Applying shop or any other traditional method with air-flow when making net of the present invention, should careful disposal and carry this polymer gel agent granule, become smaller particles to avoid these grain breakages.When the gellant granule is in coalescent state, when agglomerate is perhaps more crisp than non-coalescent granule, more want so.If among cancellated manufacturing or after making, dispose the gellant granule curtly, agglomerate for example, so, perhaps the granule (even this granule is " non-brittle ") that in fact adds in this structure can no longer have the desired particle size distribution characteristics of aforementioned regulation.
In another example of the present invention, the present invention relates to itself to be particularly suitable for being added in the netted structure of fibrous absorbability latex agent composition as absorbent.This compositions comprises the granule of many non-fibrous non-brittle polymer gel agent materials.What gellant material itself and front were described in detail is same type.These many gellant granules also have with propose in front for the identical particle property of gellant granule that joins in the absorbent structure example of the present invention.
In another example of the present invention, it has related to the absorbing products that this absorbent structure that was described in detail is in front used as key component." absorbing products " means herein can absorb big water gaging and the consumer products of other fluid (being liquid) as body fluid.The example of absorbing products comprises disposable diaper, sanitary towel, fecal incontinence liner, napkin, facial tissue, lavatory pad etc.Absorbent structure of the present invention is specially adapted to goods such as picture diaper, fecal incontinence articles for use and sanitary towel.
Absorbing products herein generally comprises the more hydrophobic plane materiel of the liquid-tight backing of one deck, one deck transflective liquid and the absorption core that contains absorbent structure of the present invention between backing and plane materiel.The liquid-tight backing can comprise any material, and as polyethylene or polypropylene, its thickness is approximately 1.5 Mills, and it can assist fluid is retained in the absorbing products.The plane materiel of more hydrophobic saturating liquid can comprise any material as polyester, polyolefin, artificial silk etc., and it comes down to porous and the permission fluid arrives in the following absorbent structure by this layer fast.
Good especially herein absorbing products is a disposable diaper.The disposable diaper that includes absorbent structure of the present invention can be with traditional diaper manufacturing technology manufacturing, but with absorbent structure replacement of the present invention or replenish normally used wood pulp cellulose net in the conventional diaper (" air felt ") core.In the Duncan of announcement on January 31st, 1967 and the United States Patent (USP) Re26 of Baker, 151; The United States Patent (USP) 3,592,194 of the Duncan that on July 13rd, 1971 announced; Duncan that on January 13rd, 1970 announced and the United States Patent (USP) 3 of Gellert, the United States Patent (USP) 3,860 of the Buell that on January 14th, 489,148 and 1975 announced, goods to the disposable diaper pattern in 003 have sufficient narration, and these patents are at this document all incorporated by reference.As purpose of the present invention, the disposable diaper of preferentially selecting for use comprises that one deck contains the absorption core of absorbent structure of the present invention, the reverse side overlaid of the overlapping or coextensive with it core face that plane materiel and one deck and plane materiel covered or coextensive liquid-tight backing with the one side of core.It is wide that the width of backing cans be compared to core most, and the marginal portion that exceeds core backing in addition so just is provided.Diaper is preferably made the hourglass structure.
What represent in the accompanying drawing is a example according to disposable urine cloth products of the present invention.The diaper structure of hourglass shape comprises one deck liquid-tight backing (101) among the figure.Being positioned on the backing (101) is hourglass shape absorbent cores (102), and it contains absorbent structure of the present invention.This layer core contains the hydrophilic fibers material, as wood pulp cellulose.What distribute in absorbing core (102) is the polymer gel agent granule (103) that disperses, and these granules have the aforesaid particle size distribution that meets the requirements.Being positioned at that the hourglass shape absorbs above the core (102) is liquid level layer (104).
Because absorbent structure of the present invention has high absorbability to menses and urine, although this ability is measured with synthetic urine, this structure also is applicable to sanitary towel very much.The same with the situation of disposable diaper, by going to replace with the absorbent structure that contains gellant of the present invention simply or the absorbent cores (general is the net of wood pulp cellulose) of additional conventional sanitary towels, just can make the sanitary towel that uses this absorbent structure by traditional sanitary towel.Weight such as this replacement can be, this can cause volume to reduce and ability increases, perhaps also can than etc. the amount lacked of weight replace, sacrifice the increase of a part of absorbability like this, and obtained the benefit that reduces volume.Its thickness of the absorbent structure that uses in the sanitary towel for about 0.1～2 millimeter better, preferably about 0.3～1 millimeter.
An example of sanitary towel comprises a pad, the hydrophobic plane materiel of one deck and the liquid-tight bottom of one deck of absorbent structure of the present invention.Plane materiel places the relative both sides of this absorbent structure with backing.Also can at random twist in this absorbent structure in the thin paper of sealing.For plane materiel, ground and the suitable material of sealing thin paper all is known in prior art.In Duncan that announces on March 18th, 1975 and the United States Patent (USP) 3,871,378 of Smith sanitary towel and the material that wherein is suitable for there is more detailed narration, the disclosure document incorporated by reference herein.
With following all examples narration when of the present invention, provided polymer gel agent granule and contained some performance of these particulate absorbent structure.In the report part, these performances can be used following test determines:
The gel content of gellant
Gel content swollen polymer sample in the synthetic urine of several five equilibriums that the gram numerical table of the synthetic urine that is absorbed with the agent of every gram polymer gel shows is measured.The amount that is aggregated this synthetic urine of thing gellant actual absorption is measured by following method, and this comprises and use the synthetic urine solution contain blue dextran, so that the amount of the synthetic urine that the absorbed of using optical absorption measurement to calculate not to be generated is entered.
A) preparation of blue dextran solution
0.3 part of blue dextran of dissolving (Sigma D-5751) is made 0.03% blue dextran (BD) solution in 1000 parts of synthetic urine (SU) solution.Synthetic urine is 15.0 part 1% TRITON X-100,60.0 parts of NaCl, 1.8 parts of CaCl
22H
2O and 3.6 parts of MgCl
26H
2O, reuse distilled water diluting to 6000 part.The solution that makes is about 0.25 at the absorptance at its absorption maximum place of 617 millimicrons.
B) hydrogel balance
With (ⅰ) 20 parts synthetic urine (SU) solution and (ⅱ) 20 parts of blue dextrans (BD) solution the aliquot of the polymer gel agent of formation hydrogel to be measured is carried out swelling.The suspension of preparation double in blue Portugal polymers (BD) solution.For most of hydrogels, need 0.1～0.25 part formation hydrogel dry powder with respect to the blue dextran reference solution sufficiently high spectrophotometric reading to be arranged so that obtain.Under demulcent stirring rod stirs,, generally be enough to reach swelling equilibrium in equilibrium at room temperature 1 hour.After balance, from each gel suspension, separate 3 milliliters equivalent clear liquid, centrifugalize then with decantation.
C) measure gel content
With precision is the absorptivity (ABS) of each clear liquid of spectrophotometer measurement of 0.001 absorbance units.To synthesize urine solution as object of reference, its ABS=0.0.The clear liquid told of the synthetic urine suspension of blue dextran never, its absorbance should not surpass 0.01A and show because residual hydrogel particle or residual additives caused scattering further centrifugalize if numerical value is higher.The absorbance of blue dextran clear liquid should surpass blue dextran at least with reference to 0.1 absorbance units of solution.If absorption value is lower than this scope, show that needs adjustment is used for preparing the amount of the polymer gel agent of gel suspension.
D) gel content calculates
By the weight fraction of polymer gel agent in (ⅰ) gel suspension and (ⅱ) displaced volume and suspension cumulative volume recently calculate the gel content that shows with the synthetic gram numerical table of urinating in the agent of every gram polymer gel.Because the molecular weight of blue dextran is higher, it is discharged from hydrogel, so this ratio is relevant with the absorbance that records.Come the calculated for gel amount with following formula:
Gel content=［ (BD solution gram number)/(polymer gel agent gram number *) ］ *
[1-(ABS of BD solution)/(ABS of the ABS-SU clear liquid of BD clear liquid) ］
*Be corrected to dry weight reference
Absorbent structure density
The density measure of report is at 9.6 gram per centimeters entirely
2Carry out under the qualification pressure of (0.94 kPa).Use is carried out improved exact science penetrometer to kind of calliper and is measured.
The absorbability of structure
Can measure the absorbability of absorbing structure with balance requirement absorption rate testing method.In this test, is a diameter that to place diameter be that 7.5 centimetres sintered glass (4～8 microns of Por E(ASTM) Ace Glass makes for this absorbent structure sample of 5.4 centimetres) on, it keeps in touch with the liquid that is equipped with in the synthetic urine container.In this covering device, this container is placed on the dish of Mettler AE160 analytical balance.This just guarantees to read serially the weight of synthetic urine in the container, just obtains the weight of the synthetic urine that absorbed by this absorbent structure by difference.The height of sintered glass and the altitude mixture control of container are to approaching same level.0.2 pound qualification weight (1.38 kPas) per square inch is placed on above the sample of this absorbent structure.In case just can measure the gram number of the synthetic urine that every gram structure is absorbed when reaching balance with this device.
The disposable absorbent article that this absorbent structure is described and contains this structure with following example.
Example 1
The method of applying the shop with air-flow will about 80%(weight) wood pulp cellulose and about 20%(weight) crosslinked make about 0.072 gram per centimeter of unit weight with the particulate basic uniform mixture of the neutral sodium polyacrylate gellant of part
2Absorbent structure.Then the fiber mesh material that makes is suppressed into density and is about 0.21 gram per centimeter
3Structure.The wood pulp cellulose that uses is that southern softwood adds Libiee pine fiber (loose through Foley).The balanced gel amount of gellant is about the synthetic urine of every gram gellant 24 grams, degree of neutralization about 70%.
The granule of gellant sieves like this, uses the NO.25/35 screening in this absorbent structure.25/35 granule that contains of screening is to stay granule on the Unite States Standard test sieve (the alternative label NO.35 that sieves of U.S.'s series) of 500 microns sieve apertures by the Unite States Standard test sieve (U.S.'s series substitutes sieve label NO.25) of 710 microns sieve apertures.After sieving 30 minutes, between Unite States Standard test sieve (Fisher), collect this sizing with Ro-Tap sieve shaker (Tyler company).
With the method that provides in front method of testing one joint, measure the absorbability of particulate the structure of gellant that contains this screening, obtain it and be the synthetic urine of every gram structure 11.4 grams.Because the balanced capacity of known comparable 100%Foley open structure under 0.2 pound/square inch is about 6.0 gram/grams, just might calculate effective absorbability of gellant in said structure.Contain ability (with the gram expression) between gellant structure and the comparable 100%Foley open structure by mensuration, again with this difference divided by just accomplishing this point with the gellant dry weight of gram expression.Therefore, effective absorbability of this gellant that determines with the method represents that the polymer gel agent of the formation hydrogel that per unit adds is at the unit increment aspect the balanced capacity of this absorbent structure.Fa Ming purpose for this reason, the comparable structure of no gellant are the structures that a kind of and the loose component of the Foley that contains the gellant structure have same unit weight and equal densities.About 0.057 gram per centimeter of unit weight to a kind of so comparable structure of this example 1
2, and density is about 0.17 gram per centimeter
3The effective absorbability of gellant in this structure that calculates with this method for the structure of example 1 is the synthetic urine of every gram gellant 33.0 grams.
Example 2
With identical type but the absorbent structure similar that sieves that different gellant granule manufacture has an approximately uniform gelatinization agents content to example 1.The method that also is used in narration in method of testing one joint is measured the balance absorbability of these structures.Also use then with example 1 in the similar methods of narration calculate effective absorbability of gellant in each structure.
The description of test product and the absorbability that records are listed in the table I.
The table I
The granularity of polymer gel agent (PGA) is to the influence of balance absorbability
The effective PGA absorbability of PGA particle size range structure absorbability
Structure number (micron) (gram/gram) (gram/gram)
1 500-710 11.5
＊33.3
＊
2 355-500 11.2 31.3
3 180-250 10.6
＊28.5
＊
4 125-180 9.9
＊25.0
＊
5 90-125 9.7 23.8
*Twice measurement average
The data of table I show, structure 1 of the present invention and structure 2 and use the general less particulate similar structures of gellant (structure 3～5) to compare provide higher absorbability that effective absorbability of higher gellant also is provided both for this structure.
Example 3
With same component, make the absorbent structure similar to example 1 and example 2 but change the particulate content of gellant and granularity in this structure.The absorbability of this structure and effective absorbability of the gellant in each this structure have also been measured.This class formation and their absorbability are listed in the table II.
The table II
The influence of polymer gel agent (PGA) content
The effective PGA ability of structure absorbability
PGA is similar to content (gram/gram) (gram/gram)
(weight %) bulky grain
1Granule
2Bulky grain
1Granule
2
0 6.0
＊6.0
＊- -
10 9.3
＊7.9
＊40
＊26
＊
20 11.5
＊9.7 33
＊24
30 12.8
＊11.1
＊29
＊24
＊
1.500～700 microns
2.90～125 microns
*The meansigma methods of repeated measure
The data of table II show, along with the increase of total gelatinization agents content in the structure, owing to use the improvement effect than the effective absorbability of the caused gellant of the gellant of coarsegrain progressively to reduce.
Example 4
Being about the synthetic urine/gram of 49 grams and degree of neutralization with gel content is about 70% crosslinked sodium polyacrylate gellant and prepares and similar absorbent structure described in the example 1.The sizing of this gellant is that the gellant granule can be stayed on the Unite States Standard test sieve (U.S.'s series substitutes sieve label NO.35) of 500 microns sieve apertures by the Unite States Standard test sieve (U.S.'s series substitutes sieve label NO.25) of 710 microns sieve apertures.These gellant granules are added in the Foley open structure with about 15% content.The unit unit weight of the fiber mesh material that makes is about 0.05 gram per centimeter
2Then this net is suppressed into about 0.19 gram per centimeter of density
3Structure
Example 5
With the effective capacity of gellant in the balance absorbability of the structure in the example 4 and the structure and structural similarity but use the particulate situation of gellant of less sizing to compare.The result is shown in the table III
The table III
The influence of polymer gel agent (PGA) granularity
Use the PGA of high gel content
The effective PGA of PGA content PGA particle size range structure absorbability absorbs
Structure number (weight %) (micron) (gram/gram) ability (gram/gram)
1 15.2
＊500-710 12.2
＊46.6
＊
2 14.5 355-500 12.1 48.0
3 14.6 180-250 11.1 41.3
4 13.0 125-180 10.3 39.4
5 14.5 90-125 10.0 33.5
*The meansigma methods of twice measurement
The data of table III show, gellant for this higher gel content, structure 1 of the present invention and structure 2 and those use the general less particulate similar structures of gellant (structure 3～5) to compare, and both also provide effective absorbability of higher gellant for structure provides higher absorbability.
Example 6
Make disposable diaper with absorbent structure of the present invention as absorbent core layer.This absorbent structure is the hourglass shape mixture that a kind of air-flow applies the shop, and it comprises that 26.6 gram wood pulp celluloses (Foley is loose) and 5 gram gel contents are about the synthetic urine/gram of 30 grams and degree of neutralization is about 70% cross-linked sodium polyacrylate polymer gel agent granule.Basically, the particulate granularity of whole polymer gel agent is between about 355～500 microns.This particulate median granularity of quality is about 430 microns.
The gellant skewness of this absorbent structure is 20% at the weight percentage of the anterior gellant of diaper, is 13% at the furcation of diaper, is 12% at the rear portion of diaper.This structure is compacted and makes its average density be about 0.15 gram per centimeter
3, and averaging unit weight is about 0.05 gram per centimeter
2
That is narrated in the United States Patent (USP) 3,860,003 of the general Buell that announces by on January 14th, 1975 in the diaper of making, has used this hourglass shape absorbent structure as absorbing core like that.In such diaper, the core of hourglass shape is wrapped and is clipped between polypropylene plane materiel and the polyethylene backing with sealing thin paper.Compare with the similar diaper that the gellant that uses less sizing makes, utilize the absorbability of this gellant, make the structure of this diaper effective especially.
Claims (20)
1, a kind of absorbent structure that is applicable to disposable absorbing products, described absorbent structure comprise the net that the compositions by following two components constitutes,
A. the hydrophilic fibers that is about 40～95% (weight) of this structure, and
B. non-fibrous, the non-brittle polymer gel agent granule that can form hydrogel that is about 5～60% (weight) of this structure, its balanced gel amount is at least about the synthetic urine/gram gellant of 20 grams, described particulate median granularity of quality is about 400～1680 microns, in described net, described granule fully is dispersed between described hydrophilic fibers;
The density of described net is about 0.06～0.3 gram per centimeter
3
2, according to a kind of absorbent structure of claim 1, wherein
A. hydrophilic fibers is to account for the about 70～90%(weight of structure) cellulose fibre;
The polymer gel agent that B. can form hydrogel accounts for about 10～40%(weight of structure), and this is to be selected from a kind of lightly crosslinked of polyacrylate and acrylic acid grafted starch and the neutral polymer of part, but the content of balance extracting polymer in synthetic urine that contains in the described gellant is no more than about 17%(weight); And
C. the particulate median granularity of quality of this gellant is about 400～1190 microns, simultaneously, has in the described granule to be no more than about 16%(weight) granularity less than 200 microns, have to be no more than about 16%(weight) granularity greater than 1410 microns.
3, according to a kind of absorbent structure of claim 2, wherein the particulate median granularity of quality of gellant is about 400～700 microns, simultaneously, have in the described granule to be no more than about 16%(weight) granularity less than 200 microns, have to be no more than about 16%(weight) granularity greater than 1200 microns.
4, according to a kind of absorbent structure of claim 2, wherein hydrophilic fibers is a wood pulp cellulose, and the gel content of wherein polymer gel agent is about the synthetic urine/gram gellant of 25～60 grams.
5, according to a kind of absorbent structure of claim 2, wherein hydrophilic cellulose fibers is starching, twisting and curling cellulose fibre, and the gel content of wherein polymer gel agent is about the synthetic urine/gram gellant of 20～35 grams.
6, according to a kind of absorbent structure of claim 2, wherein when using the ASTM assay on U.S.'s sieve series, the gellant granule has following particle size distribution:
U.S.'s sieve series instead of numbers distribution (weight %)
Not by No. 14＜0.1
Not by No. 16＜1.0
Not by No. 20 10-35
Not by No. 50＞50
Not by No. 100＜15
By No. 100≤5
7, a kind of in the netted structure of fibrous absorbability particularly suitable as the compositions of absorbability gellant, described compositions comprises that many water insoluble substantially, lightly crosslinked, part neutralize, can form non-fibrous, the non-brittle granule of the polymer gel agent material of hydrogel, wherein:
(A) described polymer gel agent material comprises:
(ⅰ) about 50～99.999%(mole) polymeric unsaturated, polymerizable, contains the monomer of acidic group; And
(ⅱ) about 0.001～5%(mole) cross-linking agent;
The degree of neutralization of described polymer gel agent material is at least about 50%, and gel content is at least about the synthetic urine/gram gellant material of 20 grams; And
(B) described many particulate median granularity of quality are about 400～1680 microns.
8, according to the compositions of claim 7, wherein
(A) the polymer gel agent material is selected from polyacrylate and acrylic acid grafted starch, but and its balance extracting polymer content in synthetic urine be no more than about 17%(weight), and
(B) many particulate median granularity of quality are about 400～1190 microns, simultaneously, have in the described granule to be no more than about 16%(weight) granularity have less than 200 microns be no more than about 16%(weight) granularity greater than 1410 microns.
9, according to the compositions of claim 8, the gel content of wherein said polymer gel agent material is the synthetic urine/gram gellant of about 25～60 grams, and the particulate median granularity of quality of wherein said many gellant is about 400～700 microns, simultaneously, have in the described granule and be no more than about 16%(weight) granularity less than 200 microns, have to be no more than about 16%(weight) granularity greater than 1200 microns.
10, according to the compositions of claim 8, wherein said many gellant granules are when have following particle size distribution during with the ASTM assay on U.S.'s sieve series:
U.S.'s sieve series instead of numbers distribution (weight %)
Not by No. 14＜0.1
Not by No. 16＜1.0
Not by No. 20 10～35
Not by No. 50＞50
Not by No. 100＜15
By No. 100≤5
11, according to the compositions of claim 8, wherein the gellant granule is coalescent state.
12, a kind of absorbing products that improves absorbent properties, described goods comprise:
A. the liquid-tight backing of one deck;
B. the plane materiel of one deck transflective liquid; And
C. the absorption core between described backing and described plane materiel, described absorption core comprise the net that the compositions by following component constitutes:
(ⅰ) be about 40～95%(weight of net) hydrophilic fibers; And
(ⅱ) be about 5～60%(weight of net) non-fibrous, the non-brittle granule of polymer gel agent of formed hydrogel, its balanced gel amount is at least about the synthetic urine/gram gellant of 20 grams, described particulate median granularity of quality is about 400～1680 microns; In described net, described granule fully is dispersed between described hydrophilic fibers;
The density of described net is about 0.06～0.3 gram per centimeter
3
13, according to the absorbing products of claim 12, wherein
A. in this net, hydrophilic fibers is a cellulose fibre, and it accounts for 70～90%(weight of net);
B. in this net, the polymer gel agent that forms hydrogel accounts for 10～40%(weight of net), and this is a kind of lightly crosslinked, neutral polymer of part that is selected from polyacrylate and acrylic acid grafted starch, but the content of balance extracting polymer in synthetic urine that described gellant contains is no more than about 17%(weight); And
C. in this net, the particulate median granularity of quality of gellant is about 400～1190 microns, simultaneously, has in the described granule to be no more than about 16%(weight) granularity less than 200 microns, have to be no more than about 16%(weight) granularity greater than 1410 microns.
14, according to the absorbing products of claim 13, wherein in net, the particulate median granularity of quality of polymer gel agent is about 400～700 microns, simultaneously, have in the described granule and be no more than about 16%(weight) granularity less than 200 microns, have to be no more than about 16%(weight) granularity greater than 1200 microns.
15, according to the absorbing products of claim 13, wherein in net, hydrophilic cellulose fibers is a wood pulp cellulose, and wherein in net, the gel content of polymer gel agent is about the synthetic urine/gram gellant of 25～60 grams.
16, according to the absorbing products of claim 13, wherein in net, hydrophilic cellulose fibers is starching, twisting and the cellulose fibre that curls, and wherein in net, the gel content of polymer gel agent is the synthetic urine/gram gellant of about 20～35 grams.
17, according to the absorbing products of claim 13, wherein in net, the gellant granule is when have following particle size distribution during with the ASTM assay on U.S.'s sieve series:
U.S.'s sieve series instead of numbers distribution (weight %)
Not by No. 14＜0.1
Not by No. 16＜1.0
Not by No. 20 10～35
Not by No. 50＞50
Not by No. 100＜15
By No. 100≤5
18, a kind of disposable urine cloth products according to claim 13, wherein,
A. described plane materiel is coextensive with a face of described core;
B. described backing is coextensive with described core on the face opposing face of the core that is covered by described plane materiel, and backing is wideer than core, and therefore the marginal portion that extends in core backing in addition is provided; And
C. described absorption core is the hourglass shape
19, according to a kind of diaper goods of claim 18, wherein, in the net of absorbent cores, polymer gel agent granule exists Concentraton gradient, and the concentration of higher relatively polymer gel agent is arranged than the zone of the net of close plane materiel in the net zone of the most close backing.
20, a kind of absorbing products of the sanitary towel's form according to claim 13, wherein the density of net is about 0.09～0.22 gram per centimeter in the absorbent core layer
3
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88106995 CN1027040C (en) | 1987-08-19 | 1988-09-30 | Absorbent structures with gelling agent and absorbent articles containing such structures |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US8713787A | 1987-08-19 | 1987-08-19 | |
| CN 88106995 CN1027040C (en) | 1987-08-19 | 1988-09-30 | Absorbent structures with gelling agent and absorbent articles containing such structures |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1041275A true CN1041275A (en) | 1990-04-18 |
| CN1027040C CN1027040C (en) | 1994-12-21 |
Family
ID=25742490
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88106995 Expired - Lifetime CN1027040C (en) | 1987-08-19 | 1988-09-30 | Absorbent structures with gelling agent and absorbent articles containing such structures |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1027040C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112218665A (en) * | 2018-06-27 | 2021-01-12 | 金伯利-克拉克环球有限公司 | Absorbent article comprising nanoporous superabsorbent particles |
| US11596924B2 (en) | 2018-06-27 | 2023-03-07 | Kimberly-Clark Worldwide, Inc. | Nanoporous superabsorbent particles |
-
1988
- 1988-09-30 CN CN 88106995 patent/CN1027040C/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112218665A (en) * | 2018-06-27 | 2021-01-12 | 金伯利-克拉克环球有限公司 | Absorbent article comprising nanoporous superabsorbent particles |
| US11596924B2 (en) | 2018-06-27 | 2023-03-07 | Kimberly-Clark Worldwide, Inc. | Nanoporous superabsorbent particles |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1027040C (en) | 1994-12-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1043416C (en) | Porous, absorbent, polymeric macrostructures and methods of making the same | |
| EP0304319B1 (en) | Absorbent structures with gelling agent and absorbent articles containing such structures | |
| CN1079698C (en) | Absorbent gelling material made of at least two hydrogel-forming particles and prepn. thereof | |
| CN1035715C (en) | Absorbent structures containing stiffened fibers and superabsorbent material | |
| CN1031035C (en) | Absorbent structures containing superabsorbent material and web of wetlaid stiffened fibers | |
| US8426670B2 (en) | Absorbent structure, absorbent article, water-absorbent resin, and its production process and evaluation method | |
| US5061259A (en) | Absorbent structures with gelling agent and absorbent articles containing such structures | |
| DE602004005830T2 (en) | Particulate water-absorbing material | |
| US5610220A (en) | Powder-form polymers which absorb, even under pressure, aqueous liquids and blood, a method of producing them and their use in textile articles for body-hygiene applications | |
| DE60027622T2 (en) | Water-absorbent resin powder, its production process and its application | |
| US6300275B1 (en) | Resilient superabsorbent compositions | |
| KR100444022B1 (en) | Fluid-absorbing polymers, process for the preparation and use thereof | |
| US6054541A (en) | Process of manufacturing precursor of an absorbing agent | |
| KR100678288B1 (en) | Water-absorbent resin and its production process | |
| CN1050304C (en) | Particulate, absorbent, polymeric compositions containing interparticle crosslinked aggregates | |
| US5549590A (en) | High performance absorbent particles and methods of preparation | |
| CN1411381A (en) | High permeability, low absorption capacity polymers | |
| EP0884037A1 (en) | Absorbent article and production process therefor | |
| EP1448242A1 (en) | Crosslinked polyamine coating on superabsorbent hydrogels | |
| JP2002509993A (en) | Improved method of absorbing structure by wet deposition method | |
| CN1678356A (en) | Superabsorbent polymers and method of manufacturing the same | |
| CN1093285A (en) | The adhesion hygroscopicity particulate porous hygroscopic macrostructure surface-crosslinked with cationic amino-epichlorohydrin adducts | |
| CN1933858A (en) | Absorbent member for absorbent articles comprising swellable polymers of high permeability which are capable of forming hydrogels | |
| JP2002505912A (en) | Absorbent structure including a liquid storage member with improved ability to dewater the distribution member | |
| CN1241947A (en) | Antimicrobial-coated hydrogel forming absorbent polymers |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
| OR01 | Other related matters | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |