CN1241129A - Breathable disposable absorbent article for topical adhesive attachment to skin of wearer - Google Patents

Abstract

The present invention relates to breathable absorbent articles particularly sanitary napkins, panty liners, adult incontinence products or sweat pads. In particular, the present invention relates to such breathable absorbent articles which are worn by direct attachment to the skin of the wearer in the area where absorption of bodily liquids is desired.

Description

The part sticks with glue agent and is fixed to gas-pervious disposable absorbent article on the wearer's skin

Invention field

The present invention relates to gas-pervious disposable absorbent article, particularly sanitary towel, scanties lining, adult incontinence products or sweat-blocking pad.The present invention be more particularly directed to the gas-pervious disposable absorbent article of this class, these articles for use are by being worn on the position that needs absorb body fluids on the skin that directly is fixed on the wearer.

Background technology

The general prior art that locally applies to the disposable absorbent article field on the wearer's skin is especially developed in Band-aid, Gypsum Fibrosum preparata (plaster) and binder field.These absorbent devices are breathability normally, with in case of emergency, for example wound occurred in the wearer's skin in this case, needs to absorb the body fluid that wound is discharged.In this sense, the performance parameter of absorbent device, as comfortable and use easily and use, painless removal, discreteness are subordinated to aseptic as wound, these standards of treatment support, mechanical protection.And these class wound covering absorbent device great majority are used for this class skin part, before using absorbent device, can remove the chaeta at these positions or not long chaeta or chaeta herein seldom.

The present invention does not relate to the wound covering absorbent device, and relates to absorb the breathability disposable absorbent article of nature from health rather than the effusive body fluid of wound.For example, breathability sanitary towel or the scanties lining that is used for genital area is exactly these class articles for use.Being worn on as the breathability incontinence article of people's genital area or the breathability sweat-blocking pad that is worn on axillary fossa also is theme of the present invention.

If these class articles for use are used for wearer's common growth when having on the skin part of hair of quite big quantity, the requirement of removing articles for use particularly important so easy and painlessly.These class articles for use have been done general disclosure in United States statutory invention registration H1602 or WO96/33683.The more details of these class articles for use has been done research in as PCT application WO95/16424.Disclosed in this document and had the hygienic article that is administered to the body and function adhesive on wearer's side (body adhesive) of sanitary towel along whole periphery.The subject matter that this document exists mainly is that safety is fixed on the skin, mentions simultaneously and uses the back at the separation problem that wearer is not caused these class articles for use under the undue pain.

The rheology standard of the open part labor body and function adhesive of WO95/16424.But this document does not almost relate to the painless removal problem of these class articles for use, because the rheology standard of describing comprises the compositions of depilation (promptly removing hair).Commercially available compositions is as the STREP MIELE (TM) that is sold by LaboratoriVaj S.p.A in Italy.The adhesive of the localized immobilization of mentioning in WO95/16424 comprises that also of today being used for is fixed to pressure-sensitive adhesive on the underwear with sanitary towel.And this document has only been discerned static rheological charactristics, but does not describe the dynamic rheology feature of body and function adhesive.

WO96/13238 discloses the body and function adhesive model that depends on frequency.But disclosed all measured values as on the 9th page, all are to carry out under-60 ℃～+ 120 ℃ temperature and under the actual frequency of 0.1～100 radian per second (rad/s).For the necessary data under the temperature that is applied (about 20 ℃, general bathroom, i.e. storage temperature), used Williams-Landel-Ferry (hereinafter claiming WLF) formula.

This WLF equation is an empirical formula, and only in specific scope effectively, can not be used to be extrapolated to temperature below the glass transition temperature that is lower than polymer adhesive as it, same WLF equation can not be used for based on the numerical value that obtains below the glass transition temperature.About the details of WLF equation and application thereof can find in following document: " Principles ofPolymer processing " (the Polymer Processing principle) of Z.Tadmor and C.G.Gogos, by John Wiley; " Viscoelastic Properties of Polymers " (viscoelastic properties of polymer) of Sons publication or J.D.Ferry is also by JohnWiley ﹠amp; Son publishes.Because this disappears from WO96/13238 already, so can not assess the suitability of disclosed data.And the disclosure content does not relate to self the adherent articles for use with breathability.

European patent application EP-638303 has disclosed uses the body and function adhesive so that make the side hoop remain on stand up position on the side hoop of sanitary towel.But Switzerland publication number CH-643730 has disclosed the purposes of the very long sanitary towel with outer chamfered edge, the body and function adhesive is arranged so that just in time provide the body and function adhesive areas in the outside in pubis hair growth district in four bights of outside.

The further improvement of the qualification of body and function adhesive and preparation directly is fixed to absorbent device improvement on the skin.But this close state of wearing has also produced problem because have on the outer surface of absorbent device can not be saturating plastic foil.This causes perspiring and the rising of articles for use internal temperature, is commonly referred to airtightly, and this can not receive the user of the sensitivity of these class articles for use at least.This problem in fact with the skin that is fixed to the wearer on articles for use more relevant than the articles for use that are fixed on the underwear because these articles for use are ventilative towards surface of wearer by it.

Based on above-mentioned prior art, an object of the present invention is to provide and be used to absorb from the wearer's body disposable absorbent article of effusive liquid naturally, these articles for use are fixed on the wearer's skin, simultaneously can painless removal absorbent device and can not suffer airtight.A further object of the present invention is to guarantee when removing absorbent device, does not have remaining adhesive to stay on wearer's the skin or hair.A further object of the invention provides disposable absorbent article, and these articles for use are worn near wearer's liquid outflow district, thereby make the liquid that flows to the absorbent device outside minimize or eliminate.For the disposable absorbent article that is worn on wearer's crotch portion, this shows as the improved safety that prevents the pollution of surrounding skin tissue and medicated clothing.

Except above-mentioned purpose, reduce or even sanitary towel, scanties lining and the sanpro of eliminating the abnormal smells from the patient that discharges from product also be desirable, because it is applied to a kind of odor seal is provided on the wearer's skin, sealing has prevented the abnormal smells from the patient of the liquid that absorbs or has arrived the outer and abnormal smells from the patient that forms of absorbent device by the liquid that absorbs.

Summary of the invention

The present invention relates to the part sticks with glue agent and is fixed to gas-pervious disposable absorbent article on the wearer of these class articles for use.These gas-pervious articles for use have a surface and the outer surface towards the wearer usually, and the articles for use below being worn on medicated clothing, outer surface is also referred to as the surface towards medicated clothing.Conventional sanitary towel and use adhesive sanitary towel towards garment side usually can not transflective liquid, air and water vapour.By comparison, articles for use of the present invention are by being the breathability that provides of permeable steam at least, because can reach best radiating effect (therefore prevented make soaked with sweat, be clamminess sensation) from permeable steam.But, preferably, articles for use also be air permeable towards garment side, but do not sacrifice to leak important can not liquid permeability.

In particularly preferred embodiment of the present invention, egative film contains porous formed film, and its mesopore is funnel shaped, and a substrate opening is arranged in the porch of funnel, and a summit opening is arranged in the exit of funnel.This porous formed film is positioned at the egative film of gas-pervious absorbent device, thus the more close absorbent article core of summit aperture efficiency substrate opening.

In another particularly preferred embodiment of the present invention, the breathable backsheet of ground floor and the second layer provides by having at least towards wearer's surface.The position of these layers be ground floor than the more close absorbent article core of the second layer, preferably ground floor is the porous formed film of foregoing air permeable, the second layer is microporous membrane or melt-blown nonwoven substrate.

Ventilative articles for use are included in towards wearer's surface and the absorbent article core structure between the surface of medicated clothing and are used for absorbing from the effusive naturally liquid of wearer.Gas-pervious disposable absorbent article of the present invention at least a portion on wearer surface, contain adhesive, be used for the part and stick with glue the surface that agent is fixed on articles for use the wearer.

A particularly preferred embodiment, the feature of adhesive especially is: have elastic modelling quantity under the temperature of 37 ℃ (100), be abbreviated as G ' 37, have viscous modulus under the temperature of 37 ℃ (100), be abbreviated as G " 37.Thereby select adhesive to be no more than 150% of G ' 37 under 1 radian per second with difference (Δ G ' 37) with dynamic elasticity character G ' 37 under the frequency of G ' under the frequency of 100 radian per seconds 37 and 1 radian per second, preferably 80%, or preferably less than 10000Pa.Thereby further select adhesive to be no more than 10000Pa in the difference of G under the frequency of 100 radian per seconds " G under the frequency of 37 and 1 radian per second " 37 (Δ G " 37), preferably be no more than 5000Pa, most preferably be not more than 1000Pa to have dynamic adhering performance.

Particularly preferably be the G ' 37/G of articles for use of the present invention in the whole frequency range of 1～100 radian per second " 37 ratio is more than or equal to 1, more preferably greater than or equal 1.6, most preferably more than or equal to 3.3.

At least " 37 ratio can change along with the increase of frequency the G ' 37/G in the frequency range of 1～100 radian per second, needn't be directly proportional with frequency change simultaneously." it should should most preferably should not be constant greater than 2 times preferably greater than 3 times that 37 ratio changes in frequency range to this G ' 37/G.

When 1 radian, the preferred value of G ' 37 is lower than 20000Pa, preferably is lower than 15000Pa, most preferably even less than 10000Pa." 37 value should not surpass 15000Pa, and it should be preferably less than 10000Pa, most preferably even less than 5000Pa on the other hand, G under the frequency of 1 radian per second.Above-mentioned rheology standard can satisfy by adhesive compound, this moment compositions comprise 51%～99.5% be the plasticized compound or the compositions of liquid in the time of 20 ℃, 0.5～20%, preferred 5～15% polymerizable compound or compositions and a kind of tackifying resin of solvable or swellable in plasticized compound or compositions, the amount ranges of this resin is 0～600% of a polymerizable compound weight.Plasticized compound or compositions are preferably from water, alcohol, preferably glycerine, glycol, Polyethylene Glycol, liquid polybutadiene, oil or its combination, polymerizable compound or compositions are preferably selected from block-copolymer-thermoplastic elastomer (TPE), styrene-block-copolymer and hydrogenant styrene-block-copolymer simultaneously.

Be more typically, preferred body and function adhesive is that part is hydrophobic at least, and is preferred 60%, and more preferably the adhesive of 80% weight is made of hydrophobic components, and it is hydrophilic most preferably not having a kind of material in the adhesive, and promptly it is made by hydrophobic components fully.

In particularly preferred embodiment of the present invention, adhesive covers less than 20%, perhaps even be more preferably less than the surface towards the wearer of 10% absorbent device.The present invention is the most favourable to be to be applied to sanitary towel or scanties lining field.

Detailed Description Of The Invention

The present invention relates to be applied directly to the gas-pervious disposable absorbent article on the wearer's skin.Because breathability and application mode, these articles for use have absorbability, protect the user medicated clothing to avoid staiing, improving the physiological comfort of user body fluid, and produce easily and pack.Describe this gas-pervious disposable absorbent article below with reference to sanitary towel or menopad, but term " disposable absorbent article " especially comprises medicated underpants lining, adult-incontinence articles or sweat-blocking pad.Term used herein " sanitary towel " refers near be worn on the perineal region and planned to absorb and hold the multiple body fluid (as vagina Excreta, menstruation and/or urine) of discharging from health and once using the back to plan to throw away by the women articles for use.This disposable absorbent article preferably approaches, and most preferably 1～5mm is thick, can be flat basically before use, perhaps is preformed state.

Term used herein " connection " or " fixing " comprise wherein that first parts are directly connected to the configuration of second parts and wherein by first parts are connected on the intermediate member, thereby intermediate member is connected to the configuration that first parts on second parts are connected to second parts indirectly.

An embodiment preferred, sanitary towel of the present invention comprise liquid thoroughly top flat, be connected to liquid-tight egative film and the absorbent article core between top flat and egative film on the top flat.Sanitary towel has two first type surfaces, with Body contact or towards wearer's surface with towards or contact the surface of medicated clothing.

Top flat is submissive, soft feel and non-stimulated to wearer's skin.Top flat also can have elastic performance, makes it extensible in one or two direction or its whole extension of some part of top flat.In addition, top flat is a liquid, allows liquid (as menstruation and/or urine) to see through its thickness easily.Suitable top flat can be made by many materials, as weaving or non-woven material; The thermoplastic film of polymeric material such as porous formed thermoplastic film, porous plastic film and hydroforming; And the rare gauze of thermoplasticity.Suitable weaving and non-woven material can by natural fiber (as wood or cotton fiber), synthetic fibers (as polymer fiber such as polyester, polypropylene or polyethylene fibre) or natural and synthetic fibers or two-/combination of many-component fibre makes.

The used preferred top flat of the present invention is selected from the nonwoven top flat and the porous formed film top flat of high loft usually.Porous formed film especially is preferred in the top flat, because they can see through bodily exudate, and does not absorb them, and liquid is returned and the trend of returning wet wearer's skin reduces.Therefore, the surface of the formed film that contacts with the wearer keeps dry, and therefore reduces health and is stain, for the wearer provides a more comfortable sensation.Suitable formed film is at USP3, is described in 929,135, USP4,324,246, USP4,342,314, USP4,463,045 and USP5,006,394.The porous formed film top flat of particularly preferred microcosmic is at USP4, done disclosure in 609,518 and USP4,629,643.The used preferred top flat of the present invention comprises the formed film of describing in above-mentioned one or more patent, and by The Procter ﹠amp; (Cincinnati Ohio) sells with " DRI-WEAVE " in sanitary towel Gamble Company.

The present invention also considers not have homogeneous fluid passage to distribute, and only some top flat contains the top flat of fluid passage.To such an extent as to this class top flat has central authorities' liquid thoroughly of the fluid passage top flat of distribution like this usually, and periphery liquid thoroughly.

The surface towards the wearer of formed film top flat can be thereby that the hydrophilic flowing fluid ratio body surface that helps is not the hydrophilic top flat that sees through quickly.In a preferred embodiment, surfactant is joined in the polymeric material of formed film top flat, described in PCT publication number WO93/09741.In addition, can handle that it is become is hydrophilic with surfactant to the surface towards the wearer of top flat, as US4,950,254 is described.

Another kind of alternative plan is so-called hydridization top flat, and this top flat combines fibrous and membrane structure.The useful especially embodiment of this class hydridization top flat has been done disclosure in PCT publication number WO93/09744, WO93/11725 or WO93/11726.

When relating to top flat, consider multiple structure or single layer structure.A kind of multilamellar design that hydridization top flat above-mentioned comes to this, but consider that also other multilamellar top flat is as the secondary top flat design of advocating peace.

Absorbent structure or absorbent article core can comprise following parts: (a) optional main fluid Distribution Layer, preferably with optional secondary fluid Distribution Layer; (b) fluid storage layer; (c) the optional fiber that stores below the layer (" bottoming " (dusting)) layer of being positioned at; And (d) other optional feature.A. master/secondary fluid Distribution Layer

An optional feature of absorbent structure of the present invention is main fluid Distribution Layer and secondary fluid Distribution Layer.This main Distribution Layer be usually located at the following of top flat and with the top flat fluid communication.Top flat is used for final assignment for this main Distribution Layer the FLUID TRANSPORTATION of collecting and gives the storage layer.Fluid not only carries out along thickness by the conveying of main Distribution Layer, and carries out along the length and the width of absorbent product.Also be choose wantonly but preferred secondary fluid Distribution Layer be usually located at the following of main Distribution Layer and communicate with it.The purpose of this secondary fluid Distribution Layer is to collect fluid from main Distribution Layer easily, and it is transported to following storage layer rapidly.This helps the fluid displacement of the storage layer of lower floor to make full use of.Fluid distribution layer can be made of any material that is generally used for this class Distribution Layer.Particularly, keep fibrous layer capillaceous between fiber (even moist) to can be used as Distribution Layer.B. fluid storage layer

The fluid storage layer be usually located at main or secondary Distribution Layer below, and with they fluid communication.This fluid storage layer contains any hygroscopic material commonly used or its combination.It preferably comprises absorbent gelling formed material and suitable carriers, and the absorbent gelling formed material is commonly referred to " hydrogel ", " superabsorbent ", " hydrocolloid " material.

The absorbent gelling formed material can absorb a large amount of aqueous body fluids usually, and can also keep the liquid of these absorptions under middle pressure.These absorbent gelling formed materials can even or non-homogeneous being dispersed in the suitable carriers.If carrier itself is moisture absorption, also can use suitable carriers separately.

Suitable sucting wet gel material used herein is the most common to contain water-insoluble, crosslinked slightly substantially, the neutral polymer gel material of part.When contacting with water, this material forms hydrogel.This base polymer material can be by polymerisable, undersaturated acidiferous monomer preparation well known in the art.

Suitable carriers comprises that routine is used for the material of absorbent structure, as natural, modification or synthetic fibers, particularly is the modification of fine hair and/or tissue paper form or the cellulose fibre of non-modification.Suitable carriers can be used together with sucting wet gel material, but also can be used alone or in combination carrier.Concerning sanitary towel/scanties lining, most preferably tissue paper or tissue paper lamination thing.

An embodiment of absorbent structure prepared in accordance with the present invention comprises tissue paper itself is folding and double-deck tissue paper lamination that form.These layers can be connected to each other.Sucting wet gel material or other optional material can be included between these layers.

Can use the cellulose fibre of modification, as stiffening cellulose fibre.Also can use synthetic fibers, comprise the synthetic fibers of making by following material: cellulose acetate, polyvinyl fluoride, Vingon, acrylic compounds (as Orlon), polyvinyl acetate, insoluble polyvinyl alcohol, polyethylene, polypropylene, polyamide (as nylon), poly-vinegar, bicomponent fibre, tricomponent fibre and composition thereof etc.Preferably, fiber surface is hydrophilic or is processed into hydrophilic.Store layer and can comprise that also filler as perlite, kieselguhr, Vermiculitum etc. is to improve the stand-up of liquid.

If sucting wet gel material anisotropically is dispersed in the carrier, storing layer can be local uniform, and promptly one or several direction in the scope that stores layer has the distribution gradient.Non-uniform Distribution also can refer to partly or entirely surround the carrier lamination of absorbent gelling formed material.C. Ren Xuan fiber (" bottoming ") layer

A contained optional feature of absorbent article core of the present invention is near storing layer, common fibrous layer below storing layer.The fibrous layer of this lower floor is commonly referred to " bottoming " layer, because it provides substrate for the sucting wet gel material in the deposition storage layer in the process of producing absorbent article core.Really, be at sucting wet gel material under the situation of macrostructure such as fiber, sheet or strip, can not contain this fiber " bottoming " layer.But, should provide the fluidic ability of some additional processing as length direction fast Absorption fluid by " bottoming " layer along pad.D. other optional feature of absorbing structure

Absorbent structure of the present invention can comprise other optional feature that exists usually in the moisture absorption net.Rare gauze (scrim) of reinforcement for example, can be set in each layer of absorbent structure or between each layer.To such an extent as to rare gauze that this class is strengthened should have the interface barrier that such configuration can not form FLUID TRANSPORTATION.Consider the structural integrity that occurs usually owing to heat bonding, concerning the absorbent structure of heat bonding, it is normally unwanted that this strengthens rare gauze.

Contained another composition in the absorbent structure of the present invention, and preferably to be arranged on be odor control agent near main or the secondary fluid Distribution Layer or as its part.Optional active carbon or active carbon and other odor control agent that is coated with odor control agent, zeolite that described odor control agent is particularly suitable or the clay material of adding in the absorbent structure.These compositions can any suitable form add, but add with discrete particulate forms usually.Breathable backsheet

Absorbent device of the present invention contains the breathable backsheet as the basic element of character.The main effect of breathable backsheet be prevent to absorb with remain in absorbent device in effluent article such as nightwear and the underwear getting wet and contact absorbent device.In order to finish this effect, egative film extends and can reach on the top flat along whole absorbent structure usually, and by around the folding part that forms top flat of absorbent structure.Therefore, can top flat be carried out reach US4, the 342,314, the 6th hurdle, the capable disclosed top flat configuration of 47-62 under the selectivity punching need not.

Except stoping liquid by the egative film conveying, breathable backsheet also allows water vapour and preferred water steam and air by its conveying, thereby allows air from egative film and absorbent device turnover itself.

The used suitable breathable backsheet of the present invention can be selected from all breathable backsheets as known in the art.In principle, two types breathable backsheet is arranged, promptly gas-pervious and liquid-tight monolayer breathable backsheet and have two-layer at least egative film, this two-layer combining provides gas-pervious and liquid-tight.The term " liquid-tight " that the present invention is used for breathable backsheet only relates to prevention liquid from the effusive barrier of articles for use.In principle, do not think and to enter fluid removal in the articles for use by breathable backsheet outside this term.

The used suitable monolayer breathable backsheet of the present invention comprises those as describing those in GBA2184389, GBA2184390, GBA2184391, US4591523, US3989867, US3156242 and EP application number 95120653.1.

Suitable bilayer that the present invention is used or multi-layered gas-permeable egative film comprise those that those are exemplified in US3881489, US4341216, US4713068, US4818600, EPO203821, EPO710471, EPO710472, European Patent Application No. 95120647.3,95120652.3,95120653.1 and 96830097.0.

The egative film that satisfies defined requirement in European Patent Application No. 96830343.8 is particularly preferred, and more preferably wherein absorbent device generally also satisfies wherein described requirement.

Breathable backsheet of the present invention contains one deck at least, the layer of preferred two-layer at least porous steam.The layer of suitable permeable steam comprises film and the shaping perforated membrane that film, monolithic membrane, the macroscopic view of two dimension, plane micropore and macropore are expanded.Hole in the layer of the present invention can be any configuration, but preferably spherical or oval-shaped.The hole also can multiple size.In preferred embodiments, the hole preferably distributes on the whole surface of layer equably, but also can consider to have only on the surface layer of certain zone punching.

The average diameter in the hole that the used two dimensional surface shape film of the present invention has is 5～200 microns.The average diameter that is applicable to the hole that two dimensional surface shape microporous membrane of the present invention has is 150～5 microns, preferred 120～10 microns, most preferably 90～15 microns.The average diameter in the hole that typical two dimensional surface shape macroporous membrane has is 200～90 microns.Be applicable to that the film of macroscopic view expansion of the present invention and the aperture that shaping perforated membrane (three-dimensional films) has usually are 100～500 microns.Its mediella comprises the film of macroscopic view expansion or embodiment of the present invention of porous formed film, and egative film has usually greater than the long-pending aperture area of total backsheet surface of 5%, preferred 10～35%.

The suitable two dimensional surface shape film of egative film can be made by any material known in the art, but is preferably made by common commercially available polymeric material.Suitable material be known in this field be used for so-called breathable fabric as GORE-TEX (TM) or Sympatex (TM) section bar material.Other suitable material comprises Minnesota Mining and Manufacturing Company, St.paul, Minnesota, the XMP-1001 of USA.Term used herein " two dimensional surface shape layer " refer to thickness less than 1 millimeter, preferably less than 0.5 millimeter layer, its mesopore has the diameter of average homogeneous along its length, and it can not stretch out in outside the plane of layer.Porous material as egative film of the present invention can adopt any method production known in the art, as those methods of EPO 293482 and the description of list of references wherein.In addition, the size in the hole that is produced by this method can increase (being that single shaft or twin shaft stretch this layer) by apply a power on the plane of backsheet layer.

Suitable porous formed film comprises the film with discrete hole, and the horizontal plane towards the medicated clothing face that described hole exceeds this layer stretches to absorbent article core, thereby forms projection (three-dimensional films).Projection has the aperture that is positioned at its terminal.Preferred described projection has infundibulate, is similar to US3,929,135 shapes of describing.The aperture that is positioned at the hole on plane and is positioned at the terminal of projection own can be a ring-type or acyclic, and condition is that the size or the area of cross section of projection end aperture is littler than cross sectional dimensions or the area towards the substrate face endoporus that are positioned at this layer.The preferred porous formed film of this class is unidirectional, thus they towards the direction of absorbent article core at least basically (if not fully) have the liquid conveying capacity of a direction.The film of the suitable macroscopic view expansion that the present invention is used comprises those films as describing among US4637819 and the US4591523.

Suitable monolithic membrane comprises available from the Hytrel of U.S. DuPont Corporation with at Index 93Congress, Session TA " Adding value to Nonwovens ", J-C.Cardinal and Y.Trouilhet, DuPont de Nemours International S.A., these materials of other that describe among the Switzerland.

Egative film of the present invention also comprises additional backsheet layer except that the layer that contains described permeable steam.This extra play can be positioned at egative film described porous steam the layer on.This extra play can be any material, as fibrous nonwoven layer, particularly hydrophobic fiber and meltblown fibers preferably, or the layer of the present invention's other porous steam described above, as long as they keep the basic breathability of articles for use, the anti-liquid conveying property of advantageous embodiment egative film.The adhesive that localized immobilization is used

Articles for use of the present invention described above are directly used on the skin of user.Particularly, sanitary towel is used in the fluid discharge district genital area on every side by general women's user.The term that the present invention uses " skin " not only relates to the concrete skin of user really, and comprises mucous tissue and the common hair that occurs at the genital area of sanitary towel's user.

For articles for use of the present invention being fixed on the skin of user, also be necessary at the adhesive (as being called the body and function adhesive) that on the specific region of the top flat side of wearer's articles for use, provides localized immobilization to use.

Can consider the different designs of this aspect, thereby still preferred periphery along top flat provides the body and function adhesive to stay the zone line of the articles for use that do not have adhesive.Thereby this will the most suitably make things convenient for the top flat of liquid thoroughly that does not have adhesive above the placement of articles for use be placed on the body fluid release aperture near, to such an extent as to do not have possibility leak or the situation of overflowing under, the liquid of release is transported in the absorbent structure of absorbent device immediately.

But, the body and function adhesive is arranged on the circle of closure on the periphery of top flat and there is no need, but it can be arranged in the zone that increases progressively as point or discrete line, thereby the separation between the different fixing position provides additional comfortableness for the wearer of these class articles for use.

In order to satisfy purpose of the present invention, should consider following content.The physics of body and function adhesive, rheology and adhesive property

Even use the body and function adhesive at human body skin hair and viscosity tissue, as pressure-sensitive adhesive, be understood that the most distinctive rheologic behavio(u)r of body and function adhesive compound, can only regard typical pressure-sensitive adhesive (PSA hereinafter referred to as) with great difficulty as according to this class material of discriminating.

In fact, known to the those of ordinary skill of adhesive area, the feature that PSA is different from the tool characteristic of other material that can temporarily cling article (as water) is its rheological parameters, particularly elastic modulus G ' along with the frequency change of the stress that is applied is very big.More specifically, when the frequency of the stress that is applied during from typical bonding frequency change to typical releasing bonding frequency, promptly during hereinafter described 1 radian per second to 100 radian per second, the size of the G ' of PSA can increase more than the several magnitude.

Therefore, can draw by under given frequency values, provide rheological parameters particularly the value of the G ' material that will plan to use to be defined as " adhesive " be unallowed.This may make the people misread, because under the non-existent situation of other characteristic, can cause comprising the material that does not have actual value.Therefore, it is believed that rheological properties must consider that item is a basis with kinetics.

This be not only applicable to elastic modulus G ', and ", therefore also be applicable to tan (δ)=G "/G ' that is applicable to viscous modulus G.Well-knownly be that not only the variation of G ' is bigger for typical PSA under the frequency of being considered, and G " variation bigger; G " may level off to G ', perhaps even bigger than G ', promptly tan (δ) approximately or even greater than 1, particularly removing under the agglutinating typical frequency.

Do not wish to accept the end of opinion, this can be interpreted as meaning that major part is used for removing agglutinating energy expenditure internal friction (causing that therefore it is not effective removing on the bonding), although should cause showing as very big cohesive force on the fact macroscopic view.

For the bonding condition that provides, promptly under the frequency of about 1 radian per second, the absolute value of elastic modelling quantity should be too not high, otherwise adhesive can be too hard, expects on the agglutinating surface and can not finally connect or be molded into it.Have lower G " absolute value so that it is important having good cohesion limit, this is valuable especially for being applied directly on the human body, simultaneously material keeps soft and can mildly be attached on the skin.

At last, the glass transition temperature Tg that it will be recognized by those of ordinary skills PSA is the useful parameter that more comprehensively and at length defines the classification of useful PSA material.

As mentioned above, the material that is used as body and function adhesive of the present invention has rheological properties, and they are as measuring under 37 ℃ of reference temperatures of body temperature He under a series of frequencies.Have now found that, when being applied to the body and function adhesive on the articles for use, under lower frequency, forming the adhesive contact, and bonding takes place to remove under the speed of removing articles for use.This speed represents with frequency 100 radian per seconds, and has now found that the low frequency that forms adhesive bonds is on the order of magnitude of 1 radian per second.Therefore, the used frequency range of the present invention is 1～100 radian per second.Should satisfy following series of features:

A) percentage of the elastic modulus G in frequency range ' 37 changes and to be less than or equal to 150% of G ' 37 under 1 radian per second, preferably is lower than its 100%, and more preferably less than its 80%, the advantageous variant absolute value is lower than 10000Pa.This is satisfied by the body and function adhesive that exemplifies below, and as the G ' 37 of Promeon RG-63B under identical frequency range that quote in the prior art be changed to 331%, this is that the present invention is unacceptable.

B) " 37 percentage variation is not more than 10000Pa to viscous modulus G in frequency range, preferably is not more than 5000Pa, most preferably is not more than 1000Pa.

C) at least in the frequency range of 1～100 radian per second, G ' 37/G " 37 ratios should be preferably 1 or greater than 1, are more preferably more than 1.6 or 1.6, most preferably be more than 3.3 or 3.3, preferably be no more than 50 simultaneously.

Should be noted in the discussion above that G ' and G under the applying frequency of getting 1 radian per second under 37 ℃ the temperature ".In the practical application of articles for use of the present invention, the variations in temperature of body and function adhesive is very big when the physical holding of the stock temperature of articles for use and use.As the temperature that stores near the warmer the stew can should approach 0 ℃ and be stored in the storeroom or the temperature in the bathroom that do not have heating but window winter up to 37 ℃.But, because articles for use of the present invention directly are applied on the skin and the wearer does not want to use too cold article usually, the actual temperature of body and function adhesive will reach very soon 37 ℃ or even before using by wearer's preheating.Therefore, think the most suitable selection adhesive bonds characteristic under body temperature.

As noted above, rheological charactristics is also relevant with the value of glass transition temperature Tg.For body and function adhesive of the present invention, Tg should preferably be lower than-15 ℃,, most preferably is lower than-25 ℃ more preferably less than-20 ℃.The preferred chemistry of body and function adhesive and compositions feature

For the top preferred rheology that satisfies the body and function adhesive and the needs of physical characteristic, can use following preparation standard in addition.It should be noted that the most compositions that is used as the body and function adhesive has gelationus basically structure, preferably glue.This comes from the following fact:

-key component is the material that at room temperature is liquid.

-macromole or polymers compositions are compared with less amount with plasticizer and are existed.In preferred embodiments, it forms the three-dimensional network that is formed by intermolecular physics or chemical bond.Useful especially secondary or physical bond is to contain those keys that exist in the system of inlay section thermal plastic elastic body.

More specifically, compositions contains:

A) 0.5～20%, the solubilized of preferred 5-15% weight or swell in macromolecular polymeric material in the plasticizer cited below or the mixture of this class material.As non-limiting instance, the macromolecular or polymer material of this class is natural and/or synthetic, as natural gum or derivant such as natural gum and gelatin, its derivant and alginate; Polyacrylic (polyacrilics); Polyvinyl alcohol; Polyethylene glycol oxide; Polyvinylpyrrolidone (PVP) or polyvinylether, its copolymer and derivant; Cellulose derivative; The block copolymer thermoplastic elastomer, preferably cinnamic block copolymer is more preferably styrene/ethylene-butylene/styrene (SEBS), styrene/isoprene/styrene (SIS) and the styrene/ethylene-propylene/styrene (SEPS) of hydrogenation level.

B) mixture of the plasticised mass of 51～99.5% weight or plasticised mass, it at room temperature is a liquid.As non-limiting instance, plasticizer can be water, various alcohol (as glycerol particularly), glycol, Polyethylene Glycol, liquid polybutene, natural or artificial oil such as vegetable oil, mineral oil or its combination.

C) tackifying resin of the weight of 0～600% macromolecule polyalcohol, its main scope are to adjust Tg, particularly based on the Tg of the system of synthetic polymer.

D) 0～10%, more preferably 0～5% weight is used to be convenient to agglomerative material with stable hydrophilic or hydrophobic liquid plasticizer.These can be used for the oily system, as C ₈～C ₂₂Fatty acid, its slaine and its polyoxy for derivant; Lanolin derivative; Silicon dioxide; Bentonite, montorillonite clay and derivant thereof, polyamide, wax or its mixture.

Also can contain every kind of consumption up to 10% the conventional additives that changes agent etc. for antiseptic, antioxidant, ultraviolet (UV) resistant agent, pigment, mineral filler, rheology known in the art.

When forming chemical crosslinking in the system, cross-linking agent can preferably exist with the amount up to 5% weight.Chemical crosslinking also can be by having different functional groups the mutual neutralization of polymer form, as the reaction between acid polyacrylic and the poly-polysaccharide.

The compositions of the body and function adhesive of gained is according to key component, and promptly the character of liquid plasticizer can be divided into three classes:

1) hydrophobic composition, the concurrent mixture of the oil of normally a kind of oil of plasticizer or plant or mineral sources wherein, polymer normally dissolves in or swells in the synthetic polymer in the oil, preferably elastomer.

2) mixed phase compositions, wherein hydrophobicity and hydrophilic component (may in plasticizer and polymer) form two or more separating mutually.In this case, emulsifier/surfactant preferably exists to form inconsistent alternate stable emulsion with suitable content.For body and function adhesive of the present invention, preferably to compare with hydrophilic component be main to hydrophobic components.

3) hydrophilic composition, normally water/glycerol/glycol etc. and/or its mixture of plasticizer wherein, and polymer phase is synthetic (as polyacrylic) or natural (as natural gum) source or its mixture.

What should emphasize is, knownly with medical domain different with prior art that quote is, hydrophilic compositions is not preferred, and hydrophobic and mixed phase compositions 1) and 2) be preferred in an application of the invention.

This part depends on technical reason, because the used many hydrophilic compositions of medical domain show too low elastic property and the cohesiveness useful to the present invention.Preferred other reason hydrophobic or the mixed phase compositions is that the present invention is applied to the probability that the sanitary towel field comprises that the body and function adhesive contacts with the liquid that will absorb especially.Because the liquid that will absorb all is moisture class usually, contacts and to cause a certain amount of aqueous body fluids suction body to stick with glue in the agent so stick with glue agent with hydrophilic body.

Such result is rheologic behavio(u)r and its function that changes the body and function adhesive, causes antihygienic outward appearance, and causes body fluid direct and contact skin in long time, and this is not that any disposable absorbent article of the present invention is needed usually.In addition, this also may constitute potential defective to user.Because some hydrophilic compositions may be many microorganisms even the good culture medium that comprises pathogen.

And hydrophilic body and function adhesive also can be thought of as cold and wet, and when using clean sanitary towel or oxter perspiration pad, it can not meet the expectation of ordinary consumer.Other problem comes from and particularly contains water and have the trend that drying is fallen as the body and function adhesive of plasticizer, unless they are sealed to impermeable packing.

Absorbent device of the present invention can be by this area any method preparation commonly used.Adhesive applications can not caused big problem for those of ordinary skills to the top flat side of absorbent device, because it can provide by similar techniques, as being generally used for medicated underpants fixing glue stick.The gross area towards the wearer surface of the absorbent device that is covered by the body and function adhesive should not surpass 20%, preferably be no more than 10%.Preferably, adhesive is near the periphery of absorbent device, and membranaceous top flat (or when egative film is folded on the top flat), adhesive is preferably on liquid-tight that a part of film.

Body and function adhesive on the articles for use (common as medicated underpants fixing glue stick) needs protection before use.This protection need be by paper release liner such as siliconization or that surfactant was handled, and condition is that this paper is the good adherent surfaces that the body and function adhesive of special selection is used.

In principle, absorbent device of the present invention is bearing on the wearer by the body and function adhesive, and does not need extra supporter to fix.But, on backsheet side, provide a nonskid coating so that prevent that sanitary towel from shifting out original position gradually also is possible as sanitary towel.And, do not want even medicated underpants fixing glue stick is required for the present invention, thus neither be preferred, and they are not got rid of outside content of the present invention by strictness yet.

Embodiment 1

Use the Kraton G-1651 of 9.9% weight, cinnamic styrene/ethylene-the butylene/styrene block copolymer that promptly contains 33% weight, and available from Shell Co., the Kaydol of 59.3% weight (a kind of paraffin mineral oil available from Witco Co.) prepares the used compositions based on oil of the present invention.

And said composition contains 301 parts of tackifying resin/100 part Kraton polymer.Tackifying resin is Escorez 5300, a kind of hydrogenant resin available from Exxon Co..

Use is available from the magnesium stearate of the Carlo Erba S.p.A gellant that helps as oil usefulness, and its consumption is 0.7% weight.

Add Irganox 1010, a kind of antioxidant available from Ciba-Geigy, its consumption is 0.3% weight.

Therefore, compositions finally has following percentage composition:

Kraton G-1651 9.9% weight

Kaydol 59.3% weight

Escorez 5,300 29.8% weight

Magnesium stearate 0.7% weight

Irganox 1,010 0.3% weight

In the time of 37 ℃, compositions table reveals following rheological properties:

A) elastic modelling quantity when 1 radian per second, G ' 37=6876Pa;

B) ratio of elastic modelling quantity and viscous modulus when 1 radian per second, G ' 37/G " 37=12.49,

The ratio of elastic modelling quantity and viscous modulus when 100 radian per seconds, G ' 37/G " 37=7.01;

C) when 100 radian per seconds when G ' 37 and 1 radian per second the ratio of G ' 37 be 1.308.

Above-mentioned composition is judged as comfortable when being used on the skin responsive, hirsutism.Comparative Examples

Use the Kraton G-1651 of 7.1% weight, a kind of styrene/ethylene-butylene/styrene block copolymer that contains 33% weight styrene, merge Co. in Shell, with the Kaydol of 41.9% weight, a kind of paraffin mineral oil available from Witco Co. is prepared the compositions based on Componotine oil.

And compositions contains 704 parts of tackifying resin/100 part Kraton polymer.Tackifying resin is Regalrez 3102, a kind of hydrocarbon resin available from Hercules Co..

Use is available from the magnesium stearate of the Carlo Erba S.p.A gellant that helps as oil usefulness, and its consumption is 0.7% weight.

Add Irganox 1010, a kind of antioxidant available from Ciba-Geigy, its consumption is 0.3% weight.

So compositions finally has following percentage composition:

Kraton G-1651 7.1% weight

Kaydol 41.9% weight

Regalrez 3,102 50.0% weight

Magnesium stearate 0.7% weight

Irganox 1,010 0.3% weight

In the time of 37 ℃, compositions table reveals following rheological property:

A) elastic modelling quantity when 1 radian per second, G ' 37=3059Pa;

B) ratio of elastic modelling quantity and viscous modulus when 1 radian per second, G ' 37/G " 37=2.53,

At the ratio of 100 radian per second amount elastic modelling quantity and viscous modulus, G ' 37/G " 37=0.74;

C) when 100 radian per seconds when G ' 37 and 1 radian per second the ratio of G ' 37 be 4.944.

Above-mentioned composition is judged as very uncomfortable when being used on the skin of forearm.It is unacceptable being administered on the skin of responsive hirsutism.

Claims (10)

1. a part sticks with glue agent and is fixed to gas-pervious disposable absorbent article on the wearer of described articles for use, said articles for use have a surface and the surface towards medicated clothing towards the wearer, described articles for use is characterized in that at described surface and the described absorbent article core that contains between the surface of medicated clothing towards the wearer:

The described surface of described articles for use towards medicated clothing be at least permeable steam and breathability is provided,

Described articles for use at least a portion on wearer surface, contain adhesive, be used for the part and stick with glue agent articles for use are fixed,

Described adhesive has an elastic modulus G ' 37 and a viscous modulus G under the temperature of 37 ℃ (100) " 37,

Select described adhesive having dynamic elasticity character, thereby be not more than 150% of under 1 radian per second G ' 37, preferably be not more than 10000Pa at the G ' under the frequency of 1 radian per second 37 with at the difference DELTA G ' 37 of the G ' under the frequency of 100 radian per seconds 37, and

Select described adhesive having dynamic adhesion properties, thereby " 37 are not more than 10000Pa, preferably are not more than 5000Pa at the difference DELTA G of the G under the frequency of 1 radian per second " 37 and under the frequency of 100 radian per seconds G " 37.

2. the gas-pervious absorbent device of claim 1, wherein under the frequency of 1 radian per second, G ' 37 is less than 20000Pa, preferably less than 15000Pa, most preferably less than 10000Pa.

3. each gas-pervious absorbent device in the claim 1～2, wherein, under the frequency of 1 radian per second, " 37 less than 15000Pa, preferably less than 10000Pa, most preferably less than 5000Pa for G.

4. each gas-pervious absorbent device in the claim 1～3, wherein said adhesive is the compositions of following material, contains:

51～99.5% weight in 20 ℃ of plasticized compounds that are in a liquid state or compositions;

0.5 the solubilized of～20% weight or swellable are in the polymer or the compositions of described plasticized compound or compositions;

Tackifying resin, its consumption are 0～600% of described polymer or composition weight.

5. the gas-pervious absorbent device of claim 4, wherein:

Described plasticized compound or compositions are selected from water, alcohol, glycol or its combination; And

Described polymerizable compound or compositions are selected from block-copolymer-thermoplastic elastomer (TPE), styrene-block-copolymer or hydrogenant styrene-block-copolymer.

6. each gas-pervious absorbent device among the claim 1-5, wherein the described adhesive of 80% weight is made of hydrophobic components, and most preferably all components of described adhesive is hydrophobic.

7. each gas-pervious absorbent device among the claim 1-6, wherein said adhesive cover less than 20%, preferably less than 10% described towards the wearer surface.

8. each gas-pervious absorbent device among the claim 1-7, wherein said surface towards the wearer is provided by the egative film of air permeable, described egative film contains porous formed film, preferred described hole is funnel shaped, one substrate opening is arranged in the porch of funnel, it is to make the more close absorbent article core of summit aperture efficiency substrate opening that one summit opening, the position of this porous formed film are arranged in the exit of funnel.

9. each gas-pervious absorbent device among the claim 1-8, wherein said surface towards the wearer is provided by breathable backsheet, described egative film contains the ground floor and the second layer at least, the position of described egative film is to make ground floor than the more close absorbent article core of the second layer, preferably described ground floor is the porous formed film of air permeable, and the most preferably described second layer is microporous membrane or melt-blown nonwoven substrate.

10. each articles for use are sanitary towel or scanties lining among the claim 1-9.