CN1063762C - Porous sheet and absorbent article using the same - Google Patents
Porous sheet and absorbent article using the same Download PDFInfo
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- CN1063762C CN1063762C CN 96106884 CN96106884A CN1063762C CN 1063762 C CN1063762 C CN 1063762C CN 96106884 CN96106884 CN 96106884 CN 96106884 A CN96106884 A CN 96106884A CN 1063762 C CN1063762 C CN 1063762C
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Abstract
To obtain a porous sheet capable of industrially safely and continuously producing at high rate and having air permeability, moisture permeability and resistance to water and excellent feeling and high strength (high tear strength and tensile breaking point strength) and to obtain an absorbing material using the porous sheet. This porous sheet is obtained by stretching a sheet molded of a melted and blended material of a resin composition composed of (a) 50-90 pts.wt. of a crystalline polyolefin resin, (b) 50-10 pts.wt. of an organic compound having miscibility to the crystalline polyolefin resin (a) at a temperature higher than the melting point of the crystalline polyolefin resin (a) and generating phase separation to the crystalline polyolefin resin (a) at a temperature below the melting point of the crystalline polyolefin resin (a) and (c) 0.01-3 pts.wt. (an amount to 100 pts.wt. of the crystalline polyolefin resin (a)) in at least one direction. The crystal nucleating agent (c) is a metallic salt of phosphoric ester of an aromatic alcohol.
Description
The present invention relates to a kind of porousness sheet material and use the absorbent commodity of this sheet material, more specifically, the present invention relates to a kind of have excellent tensile strength and excellent water vapour permeability and water tolerance and can be at quantity-produced porousness sheet material under the high speed, and use this sheet material absorbent commodity.
The production of porousness sheet material is normally carried out by the following method, this method comprises carries out melt kneading with olefin resin such as polyethylene or polypropylene and 40% (weight) or higher mineral filler, molten mixture is molded as sheet material, and the sheet material that stretches and obtain along single shaft or biaxially oriented.The porousness sheet material that is obtained by aforesaid method has excellent ventilative and water vapour permeability can't cause the moisture coacervation, therefore is suitable for and makes wallpaper and wrapping paper.
If also make it have flexibility except that these excellent performances, then this porousness sheet material can be used as absorbent commodity, for example as the backsheet of disposable diaper etc.In order to make this porousness sheet material have flexibility, suggestion uses linear low density polyethylene as olefin resin.
Disposable diaper commonly used comprise be used to absorb the refuse of discharge as the cartridge of urine, cover absorber surface and directly with the bottom side of the top layer material of skin contact and covering cartridge and prevent the backsheet of leak of liquid, this three part formation one integral body bonded to each other.Opening at the front and back of disposable diaper loin and thigh has flexible facility in case stopping leak leaks, and disposable diaper also has fastening facility such as a pair of adhesive tape, and the front and back waist portions of diaper is linked together.
For easy to use, preferably use width to be about the fastening tape of 25mm.Yet, tear with the position of adjusting diaper or observe when whether having urinated will being bonded in fastening tape on the backsheet, owing to intensity difference makes that the softish backsheet is torn when drawing back fastening tape, thus must new diaper of replacing.For preventing that this phenomenon from taking place, broadband (being called tail band (landing tapes)) is disposed in suggestion on the backsheet of front waist, make that in use the fastening tape Pasting also can repeat to tear on this broadband.
But be to use tail band can cause many problems again, that is: (1) constitutes the quantity and the step increase of producing diaper of the parts of diaper; (2) tail band is all more expensive than any other diaper component, so use enough wide tail band (make thus the quantity increase of employed tail band) to increase cost; And (3) even used wide tail band, runs into fastening tape sometimes according to user's the bodily form and be adhered to situation on the backsheet beyond the tail band, and can not peel off.
The open 5-98057 of Japan special permission discloses a kind of high intensity, porous property sheet material, and it contains the composition of special polyolefin resin, filler, speciality plasticizer and free radical generating agent by blowing, and on machine direction uniaxial extension blown film and obtaining.With respect to by traditional method, the molten mixture that is molding olefin resin commonly used and mineral filler forms sheet material, stretches the porousness sheet material that obtains subsequently, the intensity of this sheet material has improvement, but the improvement of this degree still is not enough to the feasible tail band that no longer needs.
In addition, because it is different to contain before melt flow property and the molding of moulded parts of resin combination of free radical generating agent the melt flow property of composition, so the inevitable unwanted material cycle use that produces in being difficult to produce makes productive rate decline.
The open 5-38011 of Japan's special permission discloses a kind of microporous sheet that is obtained by following method, described method comprise a kind of special crystalline polymer of melt blending and a kind of can with the particular compound of described polymer blending, mixture is molded as sheet material, it is separated, the sheet material that stretches and obtain.Yet the intensity of this sheet material still is not enough to make no longer needs tail band.
In addition, even the intensity of described microporous sheet and water vapour permeability can reach requirement, this microporous sheet can not satisfy as with the absorbing products material of skin contact the fabric quality requirement of the satisfaction that should have.
The open 63-161035 of Japan's special permission discloses and has added a kind of particular compound as nucleator in the production process of porousness sheet material.But,, cause the reduction of water vapour permeability simultaneously though the adding of nucleator can improve the intensity of sheet material effectively.In addition, also have a problem to be, the inevitable variation of employed nucleator consumption will cause the physical properties of resulting sheet material great changes will take place in the production process.
Therefore, the object of the present invention is to provide a kind of porousness sheet material, it demonstrates satisfied fabric quality and very high intensity (the very high tensile strength at break of very high tear strength) and air permeability and good, water vapour permeability and water tolerance, it can be at a high speed and safely with commercial scale continuous production, the present invention also aims to provide a kind of absorbent commodity that uses this porousness sheet material.
Through a large amount of research, the inventor finds that above-mentioned purpose can realize by using such porousness sheet material, this porousness sheet material can obtain by following method: with a kind of special crystalline polyolefin resin, a kind of special organic compound and a kind of specific nucleating, according to corresponding specified proportion melt blending between them.
Finished the present invention based on this discovery.Therefore, the invention provides a kind of porousness sheet material, this sheet material can prepare according to following method: the molten mixture of a kind of resin combination of melt blending, this resin combination comprises 50-90 weight part crystalline polyolefin resin (a), 50-10 weight part organic compound (b), when being equal to or higher than the fusing point of described crystalline polyolefin resin (a), this organic compound (b) and described crystalline polyolefin resin (a) but blend, but when being lower than the fusing point of described crystalline polyolefin resin (a), this organic compound will be separated and separates from crystalline polyolefin resin (a), and in the described crystalline polyolefin resin (a) of 100 weight parts, 0.01-3 weight part nucleator (c); Described melt blended material is molded as sheet material; At least in one direction described sheet material stretches; Wherein, described nucleator (c) comprises a kind of metal-salt of the aromatic ester of aryl phosphoric acid.
The present invention also provides a kind of absorbent commodity that comprises fluid permeability top layer material, liquid opacity backsheet and the cartridge between described top layer material and backsheet, and described absorbent commodity is characterised in that described backsheet comprises above-mentioned porousness sheet material.
Porousness sheet material of the present invention has satisfied fabric quality and very high intensity (tear strength and tensile strength at break) and air permeability and good, water vapour permeability and water tolerance.It can be in a continuous manner, and suitability for industrialized production promptly has excellent producibility efficiently and safely.
When absorbent commodity of the present invention is used as disposable diaper, there is not tail band, it is adhered thereto to make fastening tape tearablely to turn up the soil, and therefore has convenient and economic advantage.
Brief description of drawings
Fig. 1 is the stereographic map for the embodiment of disposable diaper of absorbent commodity of the present invention.
Below will at first describe porous sheet of the present invention in detail.
Porous sheet of the present invention is the stretched sheet that the resin combination molding from a kind of melt blending obtains, and described resin combination comprises the special crystalline polyolefin resin (a) that mixes with specific ratio, special organic compound (b) and special nucleator (c). If necessary, this resin combination also can further comprise stabilizing agent, colouring agent etc.
Among the present invention, the special crystalline polyolefin resin (a) that can be used in the described resin combination preferably mainly comprises a kind of acrylic resin. In addition, contain ethene or other vinyl monomer but its usage ratio does not affect the propylene copolymer of the crystal property of crystalline polyolefin resin (a) can use yet.
Especially, employed crystalline polyolefin resin (a) comprises the copolymer resin of acrylic resin, propylene-ethylene camphane section copolymer resin, propylene-ethylene random copolymer resin and propylene and other alpha-olefin. These resins can use separately also and can two or more be combined with.
In order to improve the physical propertys such as fabric quality and intensity, only otherwise affect the main character of crystalline polyolefin resin (a), crystalline polyolefin resin (a) also can with other resin alloy, for example with polyvinyl resin, the copolymer resin that comprises ethene and other vinyl monomer, polystyrene resin, mylar, polyamide, polycarbonate resin, polyacrylate resin and polymethacrylate resin blend.
When crystalline polyolefin resin (a) comprises above-mentioned copolymer resin or crystalline polyethylene resin, be converted into monomer ethylene/propylene weight than " i.e. (percetage by weight of ethene)/(percetage by weight of propylene) " preferably in 4/96 to 40/60 scope, be more preferably in 8/92 to 30/70 scope. When the part by weight of monomer is in above-mentioned scope, because its excellent fabric quality and intensity property (being tearing strength and tensile strength), porous sheet of the present invention is particularly suitable for the backsheet as absorbing products, particularly disposable diaper.
The melt index of crystalline polyolefin resin (a) preferably is not more than 3g/10 minute, is more preferably between 0.2-3g/10 minute.
If melt index surpasses 3g/10 minute, porousness sheet material tear strength that obtains or tensile strength reduce, and are difficult to obtain as absorbing products needed enough sheet strength during the backsheet of disposable diaper for example.Therefore, the higher limit of above-mentioned melt index is preferred.In order to obtain desirable intensity, can increase the thickness of described porousness sheet material.But the thickness that increases sheet material has not only reduced water vapour permeability but also has increased cost.If melt index is less than 0.2g/10 minute, need bigger power when in blocks extruding, cause production efficiency to descend.Therefore, above-mentioned scope is preferred.
Term as used herein " melt index " is meant the measured numerical value according to ASTMD-1238.
The more preferred example of crystalline polyolefin resin used in the present invention (a) comprises the blend of crystalline polypropylene resin, crystalline ethylene-propylene copolymer resins and these resins and a kind of polyvinyl resin, and the melt index of each described resin is between 0.2-2g/10 minute.
The special organic compound (b) that can be used in the resin combination of the present invention is so a kind of compound: when being equal to or higher than the fusing point of described crystalline polyolefin resin (a), it can be with described crystalline polyolefin resin (a) but blend, but when being lower than the fusing point of described crystalline polyolefin resin (a), this organic compound will be separated and separates from crystalline polyolefin resin (a).
Owing to the internal structure that makes sheet material have water vapour permeability when stretching is to be separated by the crystalline that is attended by crystalline polyolefin resin (a) to form, therefore, organic compound (b) is so a kind of compound: when being equal to or higher than the fusing point of described crystalline polyolefin resin (a), it can be with described crystalline polyolefin resin (a) but blend, but when being lower than the fusing point of described crystalline polyolefin resin (a), this organic compound will be separated and separates from crystalline polyolefin resin (a).
The example of compound (b) comprises the compound that has the ester chain in mineral oil, ucon oil, whiteruss, paraffin and the molecule.
The example of mineral oil comprises natural aromatic/alicyclic/aliphatic hydrocarbon of removing volatile component, and has removed alicyclic/aliphatic hydrocarbon of aromatic components or the like by hydrogenation from above-mentioned aromatic series/alicyclic/aliphatic hydrocarbon.Also comprise the ethylene/alpha-olefin hydrocarbon oligomer that is called as synthetic mineral oil.
The example of ucon oil comprises ethylene/alpha-olefin hydrocarbon oligomer (for example " Lucant " that is produced by Mitsui petrochemical complex Industrial Co., Ltd) and polybutene (for example, " the Nisseki polybutene " produced by Japan petroleum chemical industry company limited).
Whiteruss comprises and is purchased product, for example " the Diana treated oil " produced by IdemitsuKosan K.K.; By " the Lub Flex " that shell chemical company limited produces, " Shell Flex " and " Dute Lex "; And " MolescoWhite " that produce by Matsumura Sekiyu Ken-kyusho K.K..
The example of paraffin comprises various paraffin, for example the paraffin wax product of being produced by NipponSeiro company limited.
The example that has the ester cpds of ester chain in the molecule comprises (1) aliphatics or aromatic series or polybase yl carboxylic acid and aliphatic hydrocarbon, alicyclic, or the ester that obtains of the dehydration condensation of aromatic list or polyhydroxy-alcohol and (2) had not only been contained hydroxyl by intramolecularly but also had been contained the dehydration condensation of compound of carboxyl and the ester cpds (being list or polyester compound) that obtains.
The compound that has the ester chain in the molecule can prepare with one or more carboxyl acid component and one or more alkoxide component.Preparation method to described ester cpds has no particular limits, and can adopt any known esterification process.
The example of ester cpds of the present invention not only comprises the compound that obtains after all carboxyls in the carboxyl acid component and all the hydroxyl complete reactions in the alkoxide component, also comprise partial esterification products, wherein, part carboxyl in the carboxyl acid component and/or the part of hydroxyl in the alkoxide component do not participate in reaction.
The compound that contains the ester chain in the employed molecule not only comprises the synthetic ester cpds, also comprises from crude substance, for example those ester cpds after collection and the purification in coconut and the soybean.
The special example that is used as the mineral oil of compound (b) comprises the lubricating oil that is used for machine, the whiteruss that is used for the technical oil of rubber and is used for fiber, and they can obtain from different oil companies.The special example that is used as the ester cpds of compound (b) comprises phthalic acid distearyl ester, triphen pregnancy acid three oil base esters, pyromellitic acid four oil base esters, hexanodioic acid distearyl ester, sebacic acid distearyl ester, three lauric acid front three alcohol radical propane esters and four capric acid pentaerythritol esters.
From above-mentioned material, select used organic compound (b) by this way, promptly make the difference of the solubility parameter between selected organic compound (b) and the described crystalline polyolefin resin (a) within several units, preferably 2 to 3.
Described mineral oil, ucon oil, whiteruss, paraffin and ester cpds can use separately, also can be used in combination.
Except crystalline polyolefin resin (a) and organic compound (b), resin combination used in the present invention also contains a kind of specific nucleating (c).
In general, if do not add nucleator, and during production porousness sheet material at the sheet that obtains by the molten mixture molding that stretches by a kind of crystalline polyolefin resin and a kind of compound, the sheet material that is molded to is because too crisp and can not be stretched to desired degree, or, promptly allow to stretch, its tensile property is very poor, and the rupture strength of the sheet material that stretching obtains is very low.Therefore, in order to improve tensility and between intensity and water vapour permeability, to obtain good balance, in actual applications, in described molten mixture, add a kind of nucleator.
Normally used nucleator comprises mineral filler such as talcum and titanium dioxide, sorbyl alcohol type nucleator such as Sorbitol dibenzal, hexanodioic acid and phenylformic acid.But mineral filler such as talcum and titanium dioxide are not effective nucleators; Though sorbyl alcohol type nucleator such as hexanodioic acid and phenylformic acid are effective nucleators, there is following problem.
In order to improve tensility and tension breaking tenacity, need to use the nucleator of increasing amount.But using the nucleator of increment is not only that intensity is improved usually, but simultaneously water vapour permeability is sharply descended.Therefore can not make all these physical propertiess all remain on very high level.In addition, when being approximately optimum consumption and adding nucleator, the fluctuation of nucleator consumption to be added will cause the variation of the physical properties, particularly water vapour permeability of resulting sheet material.That is to say that the variation of the consumption of nucleator to be added in process of production will directly cause the variation of the physical properties of resulting sheet material.
Among the present invention, the use of specific nucleating (c) makes it possible to provide at an easy rate a kind of and does not reduce water vapour permeability and porousness sheet material that tensile strength is improved.Even when being approximately optimum consumption and adding nucleator (c), described nucleator (c) also can make the variation of the physical properties of resulting sheet material be reduced to minimum degree, therefore can produce highly stablely.
Described nucleator (c) is a kind of metal-salt of the aromatic ester of aryl phosphoric acid.Can suitably use those compounds disclosed in the disclosed Japanese patent application 58-1736.The example of nucleator (c) is: phosphoric acid 2,2-methylene-bis (4,6-two-tert-butyl phenyl) ester sodium, phosphoric acid 2,2-methylene-bis (4,6-two-tert-butyl phenyl) ester lithium, phosphoric acid 2,2-methylene-bis (4,6-two-tert-butyl phenyl) ester calcium, phosphoric acid 2,2-methylene-bis (4,6-two-tert-butyl phenyl) ester barium, phosphoric acid 2,2-methylene-bis (4-methyl-6-tert-butyl phenyl) ester sodium, and di(2-ethylhexyl)phosphate-4-tert-butyl phenylester sodium or its mixture.
For the specific ratio of above-described crystalline polyolefin resin (a) and organic compound (b), resin combination used in the present invention contains 50-90 weight part crystalline polyolefin resin (a) and 50-10 weight part organic compound (b); Preferably 60-80 weight part crystalline polyolefin resin (a) and 40-20 weight part organic compound (b).
If the ratio of organic compound (b) surpasses 50 weight parts, the mouldability of resin combination is very poor, and because organic compound (b) will leak out from the porousness sheet material in insufficient strength and the standing storage process, and the porousness sheet material that makes stretching obtain does not almost have practicality.If the ratio of organic compound (b) is lower than 10 weight parts, then can not adopt the tensile method to obtain having the porousness sheet material of desired water vapour permeability.
In the crystalline polyolefin resin (a) of per 100 weight parts, the usage ratio of the nucleator in the described resin combination (c) is the 0.01-3 weight part, is preferably the 0.01-1 weight part.
If the ratio of nucleator (c) surpasses 3 weight parts, resulting porousness sheet material can not have desired water vapour permeability.If the ratio of nucleator (c) is lower than 0.01 weight part, the insufficient strength of resulting porousness sheet material.
If desired, resin combination of the present invention also can contain other additive, as stablizer (as oxidation inhibitor) and tinting material, as titanium dioxide.Any known stablizer or tinting material can use, and it is not had special restriction.
If desired, resin combination of the present invention can further contain normally used modifier such as static inhibitor, lime carbonate and talcum, and its usage ratio is not for producing the trace of negative interaction to the basic physical properties of porousness sheet material of the present invention.
In the gross weight of resin combination, total add-on of these additives is preferably 0.01-10.% (weight), more preferably 0.1-5% (weight).
Porousness sheet material of the present invention is to make by the sheet that the molten mixture that stretches at least one direction by above-mentioned resin combination is molded to.
Term used herein " molding (or molding) " and " stretching " are elaborated preferred preparation method in conjunction with porousness sheet material of the present invention hereinafter.
The water vapour permeability of porousness sheet material of the present invention is preferably 0.2-4.0g/ (100cm
2.hr), 0.5-2.5g/ (100cm more preferably
2.hr).If water vapour permeability is lower than 0.2g/ (100cm
2.hr), then when this porousness sheet material is used as the backsheet of absorbing products, undesirably thickness or humidity will become.If water vapour permeability is higher than 2.0g/ (100cm
2.hr), water pressure resistance decline causes preventing the ability drop of leaking.
For as the absorbing products backsheet of disposable diaper for example, the water pressure resistance performance of described porousness sheet material is at least 1.5 meters, is preferably 2 meters or higher.
Porousness sheet material of the present invention is (generally being and the vertical direction of draw direction) on the direction of minimum value in tensile strength at break under the situation of uniaxial extension, and the tensile strength during fracture is preferably 100kgf/cm
2Or higher, 130kgf/cm more preferably
2Or higher, be preferably 160kgf/cm especially
2Or higher (extension at break is preferably 200% or higher, and more preferably 300% or higher, be preferably 400% or higher especially).The tear strength of porousness sheet material is preferably 200gf/mm or higher, more preferably 300gf/mm.
Porousness sheet material of the present invention is suitable for being used as for example backsheet of disposable diaper of absorbing products.In addition, it can also combine and provide as clothing or medical product with textiles, nonwoven fabric, paper etc., for example prevents water pref, prevents to catch a cold or prevents the goods of infectation of bacteria, the base material of the goods such as cotton, bedclothes, bandage and compress of sterilizing; Wrapping material as fresh provisions; As earning a bare living or the preservative property wrapping material of meiofauna, seed etc.; The material that accelerates the ripening as fruit etc.; As light screening material; As the separatory membrane that filters or prevent to spread.
A preferred method of preparation porousness sheet material of the present invention is described below.
At first, the molten mixture with resin combination described above is molded as sheet material.Described molten mixture preferably adopts normally used twin screw kneading extruder that described composition is mediated and obtained.In actual production process, preferably with described crystalline polyolefin resin (a) and nucleator (c) and additive, as stablizer and tinting material, if you are using, adopt the constant speed feeder from a hopper, to join in the forcing machine, organic compound (b) then joins the melting area (middle part of material letter) of forcing machine under pressure, described resin is plastified by volume pump at this.When the fusing point of organic compound (b) is higher than room temperature, preferably this compound is heated to the above temperature of its fusing point or fusing point so that its liquefaction and being injected in the barrel.If use stablizer and tinting material, it can be added from hopper with described resin, also can in advance it be mixed with organic compound (b), and under pressure, it be added with organic compound (b).
Described sheet material can obtain by following method: by a single screw extrusion machine that is connected in series with described twin screw extruder described molten mixture is transported in the mold head, and is extruded into sheet material by described extrusion dies.
Described molten mixture also can be extruded to the extrusion line material from twin screw extruder and cut into bead, bead can be joined to extrude in the single screw extrusion machine that has die head in flakes.
Described extrusion dies can be flat die or round mouth die head, in order to obtain higher film-making rate, preferably uses the round mouth die head.
In order to obtain higher film-making productive rate, the cooling conditions during molding is very important.That is, when the resin combination of the described fusing of cooling, be necessary the crystalline growth degree (being the crystalline size) of crystallization control polyolefin resin, preferably crystallite size be controlled in 2 to 8 microns the scope.For example, if cause forming fine crystalline very soon if speed of cooling causes forming very large crystallization or speed of cooling very slowly, to produce adverse influence to the even stretching of the stretching step of carrying out subsequently, and the intensity of resulting sheet material and water vapour permeability are low.Therefore, the consumption of wishing the nucleator (c) of cooling conditions by selecting optimization and optimization is produced described porousness sheet material.
Preferred cooling conditions is: be 0.1-3 second the fusing point needed cooling time that makes the temperature of temperature when die head is extruded of the molten mixture of described resin combination drop to crystalline polyolefin resin (a); The temperature that makes described resin combination from melt temperature 100 ℃ of needed cooling times that further descend be 2-20 second.For example, using fusing point is 175 ℃ crystalline polypropylene resin during as crystalline polyolefin resin (a), and the melt kneading temperature of resin combination is from 220-240 ℃, and melt temperature is from 158-160 ℃, therefore be 0.8-2.0 second last cooling time, and be 5-20 second a back cooling time.Term as used herein " melt temperature " is meant corresponding to the temperature of the fusing point of the material with incomplete crystalline texture or refers to have the fusing point of the material of crystalline texture completely.
The sheet material that will make thus stretches subsequently.Stretching can be carried out by the following method: at first carry out uniaxial extension along machine direction (MD), carry out biaxial stretch-formed subsequently, the biaxial stretch-formed elder generations such as adopting tenter machine, blow moulding machine, extrusion mandrel mould that comprises is along stretching on the MD direction, subsequently along carrying out the tensile step on the cross-wise direction (TD); That carries out simultaneously is biaxial stretch-formed, is included in to carry out the tensile step on MD and the TD direction simultaneously.Draft temperature preferably is not less than room temperature, and hangs down 10 ℃ at least than the fusing point of described resin combination, particularly preferably is low 30 ℃ at least.Keep balance between the mechanical properties in order to make, and have certain intensity retention rate and excellent water vapour permeability and a water tolerance, stretch ratio in one direction is at least 1.1 (that is, the length/original length after the stretching=1.1), is preferably 1.2-4, be preferably 1.3-4 especially, that is, under the situation of uniaxial extension, for along the MD direction, or under biaxial stretch-formed situation, for being 1.1-4 not only along the MD direction but also along the stretch ratio of TD direction.
Be elaborated below in conjunction with 1 pair of absorbing products of the present invention of accompanying drawing.Make as the disposable diaper of an illustrative embodiment of absorbing products although explain special reference, porousness sheet material of the present invention also can be used for other absorbing products, for example is used for incontinent person's underpants and sanitary towel.
The disposable diaper of conduct absorbing products of the present invention shown in Figure 1 comprises fluid permeability top layer material 2, liquid opacity backsheet 3 and the cartridge (not shown) between top layer material 2 and backsheet 3, and wherein backsheet 3 comprises porousness sheet material of the present invention.
In more detail, disposable diaper 1 comprises the refuse that absorption is discharged, and Niao cartridge for example, the top layer material 2 that covers absorber surface are directly and skin contact, and the backsheet 3 that covers the back of cartridge prevents leak of liquid, and this three part adheres to into as a whole.Disposable diaper 1 is provided with elastomerics 7,7, preventing liquid from back waist region 5 ' and front waist region 5 and leak around 6,6 places, zone of shank, and is provided with fastening tape 11 with back waist region 5 ' and front waist region 5 fastenings.For the purpose of easy to use, preferred and typically use the fastening tape that width is about 25mm.
Porousness sheet material of the present invention is as backsheet 3.Consider that from the needed flexibility of disposable diaper, the needed elasticity of preparation disposable diaper, user's security and production cost aspect the thickness of the backsheet of disposable diaper is preferably the 25-55 micron, more preferably the 30-45 micron.
In order to make the fastening tape of described disposable diaper 1 can strippingly directly not adhere on the backsheet by so-called tail band (landing tapes), under the thickness condition of employed backsheet, the tear strength of backsheet should be not more than 8gf, preferably be not more than 10gf, especially preferably be not more than 12gf.Therefore, in order to make thickness be, for example the tear strength of 35 microns backsheet is 8gf, and then the tear strength of its unit thickness should be 228gf/mm.
Similarly, on the minimum intensity direction, in the wide sheet material of each centimetre, the tensile strength when described backsheet ruptures should be not less than 350gf, preferably is not less than 450gf, especially preferably is not less than 550gf.Therefore, in order to make thickness be, for example the tensile strength at break of every centimetre of 35 microns backsheet is 350gf, and then the tensile strength of its unit surface should be not less than 100kgf/cm
2
Because (tensile strength of tear strength during as 230gf/mm or higher and fracture is 100kgf/cm to have used porousness sheet material of the present invention as the disposable diaper of absorbing products of the present invention
2) as backsheet, described disposable diaper has enough intensity.Therefore therefore, absorbing products of the present invention does not need to use the broadband that is used for fastening, does not need to tear backsheet and diaper can be adjusted and check.Even tear and check that when whether urinating, described backsheet can be not destroyed yet will adhering to fastening tape on the backsheet.If the water vapour permeability of backsheet is in above-described scope, these goods are very comfortable when wearing, and near the humidity user's skin can not increase.
Describe the present invention in further detail hereinafter with reference to embodiment, but be understood that and the invention is not restricted to this.Embodiment 1-6 and comparing embodiment 1-8
The porousness sheet material
Be selected from following crystalline polyolefin resin (a)-1 and crystalline polyolefin resin (a)-2 crystalline polyolefin resin (a), be selected from the organic compound (b) of following organic compound (b)-1 and organic compound (b)-2 and nucleator (c) and mix from following nucleator (c)-1 to (c)-3, make the resin combination that prescription with following table 1 is formed.Described resin combination obtains sheet material according to molding methods molding described below.Crystalline polyolefin resin (a)-1
Density is 0.91g/cm
3, melt index is that 0.5g/10min and fusing point are 169 ℃ crystallization sym-propene polymer resin (Chisso Sekiyu KagakuK.K. produce " WT 6048 ").Crystalline polyolefin resin (a)-1
Density is 0.91g/cm
3, melt index is that 0.5g/10min and fusing point are 169 ℃ crystallization sym-propene polymer resin (Chisso Sekiyu Kagaku K.K. produce " HT 1050 ").Organic compound (b)-1
Mineral oil is " by " the oily PW-90 of Diana processing " (the abbreviating " PW-90 " as) of Idemitsu Kosan K.K. production; Burning-point is 272 ℃, and aniline point is 127.7 ℃, and the ratio of aromatic hydrocarbon/naphthenic hydrocarbon/paraffinic hydrocarbons is 0/29/71 ".Organic compound (b)-2
Mineral oil is " by " the oily PW-380 of Diana processing " (the abbreviating " PW-380 " as) of Idemitsu Kosan K.K. production; Burning-point is 300 ℃, and aniline point is 144.0 ℃, and the ratio of aromatic hydrocarbon/naphthenic hydrocarbon/paraffinic hydrocarbons is 0/27/73 ".Nucleator (c)-1
Phosphoric acid 2,2-methylene-bis (4,6-two-tert-butyl phenyl) ester sodium is " by " ADEKA STAB NA-11 " (the abbreviating " NA-11 " as) of Asahi Denka KogyoK.K. production; Fusing point is 400 ℃ or higher ".Nucleator (c)-2
1,3,2, the 4-Sorbitol dibenzal is " by " EC-1 " of ECKagaku K.K. production; Fusing point: 215-220 ℃ (abbreviate as " EC-this ") ".Nucleator (c)-3
" " the Taipake CR-60 " that produced by IshiharaSangyo Kaisha company limited (abbreviates TiO as to titanium dioxide (TiO2)
2); Median size: 209nm ".
Each compound in organic compound (b)-1 and the organic compound (b)-2 is when being equal to or higher than the fusing point of described crystalline polyolefin resin (a), can with described crystalline polyolefin resin (a)-1 or 2 blend, but when being lower than described fusing point, will being separated and from described crystalline polyolefin resin, separating.
Table 1
| Resin (a) | Organic compound (b) | Nucleator (c) | ||||||
| (a)-1 | (a)-2 | (b)-1 | (b)-2 | (c)-1 | (c)-2 | (c)-3 | ||
| Embodiment | 1 | 69 | - | 31 | - | 0.05 | - | - |
| 2 | 69 | - | 31 | - | 0.035 | - | - | |
| 3 | 69 | - | 31 | - | 0.065 | - | - | |
| 4 | - | 66 | - | 31 | 0.03 | - | 3 | |
| 5 | - | 66 | - | 31 | 0.021 | - | 3 | |
| 6 | - | 66 | - | 31 | 0.039 | - | 3 | |
| Comparing embodiment | 1 | 69 | - | 31 | - | - | - | - |
| 2 | 69 | - | 31 | - | - | 0.13 | - | |
| 3 | 69 | - | 31 | - | - | 0.091 | - | |
| 4 | 69 | - | 31 | - | - | 0.169 | - | |
| 5 | 69 | - | 31 | - | - | - | 3 | |
| 6 | - | 66 | - | 31 | - | 0.1 | 3 | |
| 7 | - | 66 | - | 31 | - | 0.07 | 3 | |
| 8 | - | 66 | - | 31 | - | 0.13 | 3 | |
Molding carries out according to the method for the following stated.The kneading method
Use a twin screw extruder (diameter: 45mm, L/D=30).Crystalline polyolefin resin (a) and nucleator (c) are joined in the hopper, and organic compound (b) then is injected into the middle part of extruder barrel by toothed gear pump, and described material is carried out melt kneading.(according to the size of viscosity) if desired can be preheating to organic compound (b) and be no more than 100 ℃ temperature.This molten mixture is extruded into the line material with a die head, makes its solidification and granulation with water cooling.Output speed is 20kg/hr.The temperature of the barrel C1 part (hopper) of forcing machine is set at 150 ℃, and the temperature of C2 and C3 part is set at 220 ℃, and the temperature of C4 part is set at 200 ℃, and the temperature of C5-C7 part and head is set at 180 ℃.
The pellet that obtains is molded as sheet material according to the film of the following stated.Film
Adopt air cooling blown film device with resulting pellet molding film forming, described device comprises a single screw extrusion machine (diameter: 40mm; L/D=28), this forcing machine is connected with one and is provided with round mouth die head (diameter: 200mm).Distance between die head and the folder rod is 5 meters.The temperature of the barrel C1 part (hopper) of forcing machine is set at 190 ℃, and the temperature of C2 and C3 part is set at 220 ℃, and the temperature of C4 part and die head is set at 200 ℃.Tubular film bubble forced cooling and use to be blown into 20 ℃ air inflation from the air ring, with 6 meters/minute speed discharging, obtaining width is 60 centimetres of sheet materials that thickness is the 40-45 micron.
The sheet material that the obtains drawing process according to the following stated is stretched to obtain the porousness sheet material.Drawing process
Adopt 1 meter wide rod with stretching 1.4 times on the 50 ℃ of lower edge machine directions of sheet material that obtain, then 120 ℃ of annealing.The thickness of all resulting porousness sheet materials is the 35-40 micron.
Resulting porousness sheet material is estimated according to following described method.The evaluation 1 of porousness sheet material) tear strength:
From the test piece that described porousness sheet material downcuts a 60mm * 30mm, long side of test piece is parallel to the draw direction of porousness sheet material.Form a grooving in the direction parallel with long side, this grooving begins up to the end of short side, to make a sample test piece from the central position of test piece.To be fixed in the chuck of Tensilon Elongation test device by the two ends that described grooving separates, and make test piece be the T type, and tear with 300/mm minute draw speed along draw direction.Measure the average load that obtains in the chart and be tear strength.Tensile strength and extension at break when 2) rupturing:
Described institute permeability sheet material edge and the vertical direction of draw direction are cut into the bar of 10 mm wides.Adopting the chuck distance is that 50 millimeters draw speeds are 300mm/ minute Tensilon Elongation test device tensile strength and the extension at break when measuring fracture.3) water vapour permeability:
Measure according to JIS Z0208.4) water pressure resistance:
Method B according to JIS L 1093 measures.
Table 2
| Tensile strength (kgf/ during fracture | Extension at break (%) | Tear strength (gf/) | Water vapour permeability [g/ (100cm 2·hr)] | Water pressure resistance (m) | ||
| Embodiment | 1 | 1 4 0 | 4 5 0 | 2 9 0 | 1. 9 | ＞2 |
| 2 | 1 4 0 | 4 1 0 | 3 2 0 | 1. 9 | ＞2 | |
| 3 | 1 6 0 | 5 3 0 | 3 4 0 | 1. 8 | ＞2 | |
| 4 | 1 3 0 | 4 3 0 | 3 2 0 | 2. 1 | ＞2 | |
| 5 | 1 2 0 | 3 9 0 | 2 9 0 | 2.3 | ＞2 | |
| 6 | 1 4 0 | 4 5 0 | 3 7 0 | 1. 9 | ＞2 | |
| Comparing embodiment | 1 | - | - | - | - | - |
| 2 | 1 2 0 | 3 6 0 | 3 2 0 | 1. 9 | ＞2 | |
| 3 | 9 0 | 1 8 0 | 2 0 0 | 2.2 | ＞2 | |
| 4 | 1 7 0 | 5 8 0 | 4 6 0 | 0. 5 | ＞2 | |
| 5 | - | - | - | - | - | |
| 6 | 1 4 0 | 4 1 0 | 3 2 0 | 2. 0 | ＞2 | |
| 7 | 1 0 0 | 2 1 0 | 2 0 0 | 2.3 | ＞2 | |
| 8 | 1 6 0 | 5 5 0 | 4 3 0 | 0.3 | ＞2 | |
Porousness sheet material from the composition that contains nucleator (c)-1 (NA-11) makes demonstrates stable physical properties, and promptly its change in physical is very little, and the balance between each character is fine.
The porousness sheet material of comparing embodiment 1 is to make from the resin combination identical with the porousness sheet material of preparation embodiment 1, be not have nucleator (c)-1 in the described composition, its intensity is so low, it is being stretched to enough stretch rates so that before the sheet material that obtains had water vapour permeability, sheet material promptly ruptured.
The porousness sheet material of comparing embodiment 2-4 is to make from the resin combination identical with the porousness sheet material of preparation embodiment 1-3, just nucleator (c)-1 usefulness EC-1 in the employed composition of embodiment 1-3 replaces, the shortcoming of resulting porousness sheet material is, along with the fluctuation of EC-1 consumption, its physical properties changes a lot.In addition, the balance between each physical properties also is inferior to the balance between each physical properties of the resulting porousness sheet material of embodiment 1-3 greatly.
The porousness sheet material of comparing embodiment is to make from the composition of use titanium dioxide as nucleator, and titanium dioxide wherein shows the effect as nucleator seldom.Even it is about 3% that the consumption of employed titanium dioxide is increased to, resulting sheet material promptly ruptures before enough stretchings carrying out, and is similar with the porousness sheet material of comparing embodiment 1.
The porousness sheet material of embodiment 4-6 and comparing embodiment 6-8 is to make from the resin combination identical with the resin combination of the porousness sheet material for preparing embodiment 1-3 and comparing embodiment 2-4, just variation has taken place in organic compound (b) wherein, and further add titanium dioxide, rather than as nucleator so that the sheet material that obtains has opacifying power.
The porousness sheet material of embodiment 4-6 has excellent character, and the balance between each physical properties is also very excellent, and when working as the consumption fluctuation of the nucleator that is added, physical properties is also very stable.
On the contrary, the balance between each physical properties of the porousness sheet material of comparing embodiment 6-8 is very poor, and 2-4 is similar with comparing embodiment.
Embodiment 7-9 and comparing embodiment 9-11
Absorbing products
Use porousness sheet material that embodiment 1-3 (corresponding to embodiment 7-9) and comparing embodiment 2-4 (corresponding to comparing embodiment 9-11) obtain as backsheet respectively, make disposable diaper as shown in Figure 1 as absorbing products, described diaper comprises a top layer material, a cartridge and a backsheet.
The disposable diaper of embodiment 7-9 and comparing embodiment 9-11 is tested with 10 testing experiment persons.
The result is, the backsheet of the disposable diaper of embodiment 7-9 has satisfied quality (testing by sense of touch, flexibility and less scroop sound), the fastening tape that adheres on the described backsheet is easy to peel off, and diaper can produce feeling of oppression and heat hardly or play fash.
On the contrary, the disposable diaper of comparing embodiment 10 causes when peeling off fastening tape at the backsheet position and destroys.And the disposable diaper of comparing embodiment 11 is poor because of water vapour permeability, and causes producing feeling of oppression and heat and play a fash.
Claims (5)
1, a kind of porousness sheet material, it makes by the following method: the molten mixture of a kind of resin combination of melting mixing, this resin combination comprises the crystalline polyolefin resin (a) of 50-90 weight part, the organic compound of 50-10 weight part (b), wherein said organic compound (b) comprises the compound that has the ester chain in mineral oil, ucon oil, whiteruss, paraffin or the molecule; When being equal to or higher than the fusing point of described crystalline polyolefin resin (a), organic compound (b) and described crystalline polyolefin resin (a) but blend, but when being lower than the fusing point of described crystalline polyolefin resin (a), organic compound (b) will be separated and separates from crystalline polyolefin resin (a), and in the described crystalline polyolefin resin (a) of 100 weight parts, the nucleator of 0.01-3 weight part (c); Described molten mixture is molded as sheet material; At least in one direction described sheet material stretches; Wherein, described nucleator (c) comprises a kind of metal-salt of the aromatic ester of aryl phosphoric acid.
2, porousness sheet material as claimed in claim 1, wherein said nucleator (c) comprises at least a being selected from by phosphoric acid 2,2-methylene-bis (4,6-two-tert-butyl-phenyl) ester sodium, phosphoric acid 2,2-methylene-bis (4,6-two-tert-butyl-phenyl) ester lithium, phosphoric acid 2,2-methylene-bis (4,6-two-tert-butyl-phenyl) ester calcium, phosphoric acid 2,2-methylene-bis (4,6-two-tert-butyl-phenyl) ester barium, compound in the phosphoric acid 2,2-methylene-bis (4-methyl-6-tert butyl phenyl) ester sodium and di(2-ethylhexyl)phosphate-4-tert-butyl-phenyl ester sodium form one group.
3, porousness sheet material as claimed in claim 1, the water vapour permeability of wherein said porousness sheet material is 0.2-4.0g/ (100cm
2.hr), the water pressure resistance of described porousness sheet material is at least 1.5m.
4, porousness sheet material as claimed in claim 1, wherein said porousness sheet material are on the direction of minimum value in tensile strength at break, and the tensile strength during fracture is 100kgf/cm
2Or higher, extension at break is 200% or higher, tear strength is 200gf/mm or higher.
5, a kind of absorbing products comprises fluid permeability top layer material, liquid opacity backsheet and the cartridge between top layer material and backsheet, and the backsheet of wherein said absorbing products comprises the described porousness sheet material of claim 1.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP151917/1995 | 1995-06-19 | ||
| JP151917/95 | 1995-06-19 | ||
| JP15191795A JP3474677B2 (en) | 1995-06-19 | 1995-06-19 | Porous sheet and absorbent article using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1143565A CN1143565A (en) | 1997-02-26 |
| CN1063762C true CN1063762C (en) | 2001-03-28 |
Family
ID=15529028
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96106884 Expired - Fee Related CN1063762C (en) | 1995-06-19 | 1996-06-19 | Porous sheet and absorbent article using the same |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP3474677B2 (en) |
| CN (1) | CN1063762C (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6632850B2 (en) | 2001-04-04 | 2003-10-14 | 3M Innovative Properties Company | Microporous materials and methods of making the same |
| US8003725B2 (en) | 2002-08-12 | 2011-08-23 | Exxonmobil Chemical Patents Inc. | Plasticized hetero-phase polyolefin blends |
| US7652094B2 (en) | 2002-08-12 | 2010-01-26 | Exxonmobil Chemical Patents Inc. | Plasticized polyolefin compositions |
| US7998579B2 (en) | 2002-08-12 | 2011-08-16 | Exxonmobil Chemical Patents Inc. | Polypropylene based fibers and nonwovens |
| US7531594B2 (en) | 2002-08-12 | 2009-05-12 | Exxonmobil Chemical Patents Inc. | Articles from plasticized polyolefin compositions |
| US7652092B2 (en) | 2002-08-12 | 2010-01-26 | Exxonmobil Chemical Patents Inc. | Articles from plasticized thermoplastic polyolefin compositions |
| US7271209B2 (en) | 2002-08-12 | 2007-09-18 | Exxonmobil Chemical Patents Inc. | Fibers and nonwovens from plasticized polyolefin compositions |
| CN100345896C (en) | 2002-08-12 | 2007-10-31 | 埃克森美孚化学专利公司 | Plasticized polyolefin compositions |
| US8192813B2 (en) | 2003-08-12 | 2012-06-05 | Exxonmobil Chemical Patents, Inc. | Crosslinked polyethylene articles and processes to produce same |
| US8389615B2 (en) | 2004-12-17 | 2013-03-05 | Exxonmobil Chemical Patents Inc. | Elastomeric compositions comprising vinylaromatic block copolymer, polypropylene, plastomer, and low molecular weight polyolefin |
| WO2007011541A1 (en) | 2005-07-15 | 2007-01-25 | Exxonmobil Chemical Patents Inc. | Elastomeric compositions |
| JP5861832B2 (en) * | 2011-06-30 | 2016-02-16 | Jnc株式会社 | Microporous membrane |
| WO2015115289A1 (en) * | 2014-01-28 | 2015-08-06 | 東レ株式会社 | Porous film, moisture-permeable waterproof sheet, complex, and protective clothing |
| CN105686727A (en) * | 2015-09-08 | 2016-06-22 | 高文雷 | A pair of multifunctional shorts |
-
1995
- 1995-06-19 JP JP15191795A patent/JP3474677B2/en not_active Expired - Lifetime
-
1996
- 1996-06-19 CN CN 96106884 patent/CN1063762C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH093226A (en) | 1997-01-07 |
| CN1143565A (en) | 1997-02-26 |
| JP3474677B2 (en) | 2003-12-08 |
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