CN1114450C - Porous sheet and absorbent articles using the same - Google Patents
Porous sheet and absorbent articles using the same Download PDFInfo
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- CN1114450C CN1114450C CN 94118398 CN94118398A CN1114450C CN 1114450 C CN1114450 C CN 1114450C CN 94118398 CN94118398 CN 94118398 CN 94118398 A CN94118398 A CN 94118398A CN 1114450 C CN1114450 C CN 1114450C
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Abstract
The invention discloses a porous sheet and an absorbent article using the same. This porous sheet is prepared by molding a sheet from a resin mixture containing 55-90 pts.wt. crystalline polyolefin resin having a melt index of 3g/10min or below and 45-10 pts.wt. compound having an ester bond in the molecule and having a volatilization temperature of 240 deg.C above and a melting point of 100 deg.C or below at atmospheric pressure. The porous sheet is excellent in moisture permeability and water resistance, has high tension strengths and has such excellent productivity.
Description
The present invention relates to a kind of porous sheet and use its absorbent article.Especially relate to and have high-tensile, but the porous chips that poisture-penetrability and hydraulic pressure resistance and high production rate are made, and use the absorbent article of this porous chips as backing.
By following such explained hereafter, this technology comprises porous chips routinely: resin (as polyethylene or the polypropylene) molten mixture that contains the inorganic filler that is no less than 40% weight is shaped to sheet material, single shaft to or the sheet material of biaxial stretching gained.The porous sheet that is obtained by this technology can not cause moisture condensation being fabulous aspect breathability and the poisture-penetrability, therefore can be used as wallpaper, wrapping paper etc.In addition flexibility also makes porous sheet be suitable for doing the back lining materials of disposable diaper etc.In order to obtain softish porous chips, advised using linear low density polyethylene as olefin resin.
General used disposable diaper comprises the absorber that is used to absorb Excreta (for example urine) basically, cover on absorber surface directly and the surface material of contact skin and the topped back lining materials that leaks of preventing at the absorber back side, these three parts are bonded in together and become one.It is telescopic making corresponding to the position of waist and lower limb, prevents to leak so that fit tightly.Disposable diaper also has fixed function, and for example fixing band can be secured together low back part and front waist portion with this fixing band.Most of fixing bands use width to be approximately 25mm in order to be easy to.In case diaper is applied to child and fixes on one's body and with fixing band, do not tear soft back lining materials (owing to not having intensity) to shreds and can not pluck any more diaper, whether even to put on again or should take when looking to urinate in order to be adjacent to better also is so, in this case, diaper can only change one new.For fear of this situation, advised on the back lining materials of front side, being provided for accepting and being maintained fixed the broadband (so-called lap belt) of band, thereon with the be adhesively fixed fixing band of rear side of the mode that can pluck.
But be to use lap belt to mean the increase on the diaper constituent material kind and produce the technologic increase of diaper.Lap belt is more expensive than other composition materials of diaper, therefore uses the lap belt with enough width will increase cost.In addition, even with wide lap belt, depend on that body sizes also can run into fixing band sometimes and adhere to situation on the back lining materials outside the lap belt position, and can not remove down.
Japanese Patent Application Publication bulletin No.98057/93 has described a kind of method of producing high intensity, porous sheet material, it comprises and will comprise the compositions blow molding of specific vistanex, filler, certain plasticizers and radical initiator, and blows good thin film in the simple tension of machine traffic direction.This sheet material closely doubles the stretched sheet of being made by common olefin resin and inorganic filler on intensity, but this improvement degree is not enough for saving lap belt.In addition, owing to contain the flow behavior that the melt flow characteristics of molded goods of the resin combination of radical initiator is different from the compositions before the molding, therefore will be difficult to reclaim for the inevitable nonuseable part (for example leftover pieces chip) that produces in the general production stage, the result has reduced productivity ratio.
As the another kind of method of producing porous sheet, Japanese Patent Application Publication bulletin No.38011/93 has described the method that is used to produce the pore sheet material, it comprises specific crystalline polymer and the specific compound melt kneading that can be blended in this mixture, said composition is shaped to sheet material, in cooling step, form and be separated the sheet material of stretching gained.Although the porous sheet of Sheng Chaning has the stretched sheet two made by common olefin resin and inorganic filler to triple high strength in this way, this intensity does not reach the level that does not need lap belt yet.According to the inventor's research, the porous chips that can stand to remove from it fixing band need have at least 4 times of the porous chips that made by common process, preferred 5 times high strength.
In addition, according to the method that thin porous sheet is produced in above-mentioned being used to, used chemical compound has lower volatilization temperature, and is tending towards causing in forming process and smolders, and this has not only brought environmental pollution, but also the danger of catching fire is arranged.Have, volatile material (so-called gum in theeyes) adheres to cause on the die lip and burns phenomenon again.In order to address such production issues, be cost to sacrifice productivity ratio, make-up machine is often ended, so that take cleaning apart.
The purpose of this invention is to provide the absorbent article of a kind of porous sheet and these porous chipses of use, it demonstrates tangible improvement intensity and breathability, poisture-penetrability and hydraulic pressure resistance, and can keep the safety in production with industrialization continuously rapidly.
On the basis of extensively investigation, the inventor finds: having the exponential crystalline polyolefin resin of particular melt provides a kind of porous sheet with superelevation tensile yield strength with the molten mixture of chemical compound under specific mixing ratio with specific volatilization temperature and specific fusing point.Based on this discovery, the present invention achieves the goal.
The invention provides a kind of porous sheet of making as follows, this method comprises: resin combination is molded into a sheet material, this resin combination comprise contain its molecules of crystalline polyolefin that the melt index of from 55 to 90 weight portions is no more than 3g/10 minute and from 10 to 45 weight portions ester bond, under ambient pressure volatilization temperature be not less than 240 ℃, fusing point is not higher than 100 ℃ chemical compound, and this sheet material of uniaxial tension at least.
The present invention also provides a kind of absorbent article, and it comprises the upper layer of material of a liquid permeable and the backing sheet material of impermeable liquid, and the absorber of drawing together between, and wherein the backing sheet material is a porous sheet recited above.
Porous sheet according to the present invention has high intensity and breathability, poisture-penetrability and hydraulic pressure resistance.It can be produced with high-speed secure continuation mode (that is: high industrial productivity).
According to absorbent article of the present invention, when as diaper, do not have overlapping part, hold out against peeling off of fixing band, and have convenient economic advantage.
Details are as follows with the absorbent article that uses these porous chipses to porous sheet:
Porous sheet of the present invention is a kind of stretched sheet of resin combination, and said composition comprises the chemical compound (ester compounds made in the back abbreviation) that has ester bond in crystalline polyolefin resin and its molecule.If wish that this resin combination can further comprise filler, pigment etc.
Can be used for crystalline polyolefin resin of the present invention and mainly comprise acrylic resin, in addition, propylene-ethylene copolymers resin or the copolymer resin that comprises propylene, ethylene and/or can not influence crystalline other vinyl monomer on a small quantity also can use.The melt index of crystalline polyolefin resin is not for being higher than 3g/10 minute, and preferably from 0.2 to 3 gram is/10 minutes.Especially the melt index of crystalline polypropylene resin is from 0.2 to 2 gram/10 minutes, and crystalline ethylene-propylene copolymer resins (ethylene contents is no more than 20% weight, is usually used in extrusion molding) is preferred.From the viewpoint of quality (texture) and intensity (yield strength), the crystalline ethylene-propylene copolymer resins that has from 3 to 15% weight ethylene for the back lining materials as absorbent article is most preferred.Two or the mixture of multiple these polymer and copolymer also be available.
If the melt index of vistanex was greater than 3 grams/10 minutes, the undercapacity of the porous sheet of gained is with as absorbent article (for example: back lining materials disposable diaper).The thickness of sheet can be gained in strength, but itself has reduced permeability again and increased cost, and only increases the deficiency that thickness can not sufficiently compensate tearing toughness.If melt index is less than 0.2g/10 minute, then need bigger power during extrusion sheet.
Be meant the value of under 230 ℃, the load of 2.16kgf, measuring according to ASTMD-1238 at this used term " melt index ".
Can be used for ester compounds of the present invention and can be single-or petchem, these chemical compounds be by aliphatic series or aromatics list-or polybasic carboxylic acid and aliphatic or alicyclic or aromatics list-polyhydric alcohol between or per molecule in not only had hydroxyl but also had dehydrogenation polycondensation reaction acquisition in the chemical compound of carboxyl.Polybasic carboxylic acid preferably in aliphatic series or aromatic carboxylic acid's component.Preferably aromatics two, three or quaternary carboxylic acid in aromatic polycarboxylic acid, phthalic acid, 1,2 for example, 4-benzenetricarboxylic acid and 1,2,4,5-benzenetetracarboxylic acid.Aliphatic carboxylic acid preferably comprises aliphatic series two or tricarboxylic acid.Monobasic alkylol preferably in pure component.
Ester compounds preferably include those by aromatic polycarboxylic acid and monobasic alkylol obtain (as, single-or petchem) and those (as, single or petchem) by aliphatic polycarboxylic acid and the acquisition of monobasic alkylol.The list that obtains by polyhydric alcohol (especially polynary alkylol) and monocarboxylic acid (especially aliphatic monocarboxylic acid)-or the polyester chemical compound also be preferred.From the viewpoint of environmental conservation and safety, be preferred by the polyester chemical compound of aliphatic dicarboxylic acid or tricarboxylic acid and the acquisition of monobasic alkylol.
In these ester compounds more preferably (for example: phthalic acid, 1 by monobasic alkylol and aromatic polycarboxylic acid, 2, the 4-benzenetricarboxylic acid, 1,2,4, the 5-benzenetetracarboxylic acid) or aliphatic polycarboxylic acid's (for example: adipic acid, decanedioic acid, citric acid) obtain those, and obtain by polyhydric alcohol (for example: glycerol, diglycerol, trimethyl alcohol radical propane, tetramethylolmethane, Bis(pentaerythritol) or sorbitan) and aliphatic monocarboxylic acid's (for example: capric acid, lauric acid, Palmic acid, stearic acid or oleic acid).Add in the ester compounds of preferred gained can not cause gel not a small amount of polybasic carboxylic acid (for example: adipic acid).Consider environmental conservation and safety, the polyester chemical compound that is obtained by aliphatic carboxylic acid and aliphatic alcohol is preferred.
These ester compounds can be formed by one or more above-mentioned carboxyl acid component and above-mentioned one or more alkoxide component chemical compound, and this preparation technology does not have particular restriction, can use known any esterification techniques.
Oh group in hydroxy-acid group in all carboxyl acid component and all pure components does not need all to react, and that is to say that the partial esterification product that has wherein kept unreacted carboxylic group of part and/or oh group also can be used as ester compounds of the present invention.
Be used for its volatilization temperature of ester compounds of the present invention and be not less than 240 ℃, preferably be not less than 250 ℃ (under ambient pressures), its fusing point is not higher than 100 ℃, preferably is not higher than 80 ℃.
The resin combination that comprises crystalline polyolefin resin and ester compounds is from 180 ℃ to 250 ℃, preferably is shaped to sheet material from 190 ℃ to 240 ℃ forming temperature.If the volatilization temperature of ester compounds is lower than 240 ℃ under ambient pressure, then volatile substance trends towards causing and smolders in forming process.The cigarette of volatile substance causes environmental pollution in the forming process, and the danger of catching fire is arranged, and also causes and burns phenomenon (so-called " gum in the eyes ") and adhere to volatile substance on the die lip.For fear of burning, molding must often be ended, and with the cleaning die lip, this greatly reduces industrial productivity, and why Here it is limits the reason of ester compounds volatilization temperature.Therefore, the volatilization temperature of ester compounds preferably is not less than 250 ℃, more preferably is not less than 260 ℃.
Because when ester compounds when being remollescent or fused under draft temperature, it is porous more easy that the resin sheet material becomes by stretching, therefore, the fusing point of ester compounds should be 100 ℃ or lower, and the fusing point of preferred ester compounds is 80 ℃ or lower.
Term " volatilization temperature " with here be meant on the thermobalance in stream of nitrogen gas (30ml/min) with the heavy sample of the temperature rise rate heating 10mg of 10 ℃/min the temperature during in loss 1% weight.
The example that satisfies the particularly preferred ester compounds of these requirements comprises distearyl phthalic acid ester, trioctylphosphine benzenetricarboxylic acid ester, four octyl group benzenetetracarboxylic acid esters, two hard ester group adipate esters, distearyl sebacate, trimethyl alcohol radical propane trilaurin, tetramethylolmethane four decanoins.This ester compounds can be selected in several unit with respect to the solubility parameter of the bonded crystalline polymer of desire.
Be used for crystalline polyolefin of the present invention (following abbreviation is made " resin ") and be used for ester compounds of the present invention (following abbreviation " chemical compound ", should " chemical compound " have the volatilization temperature that under ambient pressure, is not less than 240 ℃ and be not higher than 100 ℃ fusing point) mixing proportion for based on " resin " of from 55 to 90 weight portions and " chemical compound " of from 45 to 10 weight portions, preferably based on " resin " of from 65 to 80 weight portions and " chemical compound " of from 35 to 20 weight portions.
If the ratio of ester compounds surpasses 45 parts, the processability of resin combination is poor, and by the porous chips insufficient strength of stretching gained, oozing out appears in the growth ester compounds along with the time in storage process.If be less than 10 parts, can not obtain porous chips by stretching with enough poisture-penetrabilitys.
If wish that this resin combination can contain filler, pigment or similar additive.The filler that adds, pigment etc. are not specially limited, and can use the filler that is generally used for rubber or plastics, as inorganic substances (for example calcium carbonate, Gypsum Fibrosum, barium sulfate, Talcum, clay, titanium dioxide and metal powder), based on the organic metal salt of inorganic substances.Can also use the granule or the powder of thermosetting resin, for example: phenolic resins, epoxy resin and sodium polyacrylate.These fillers preferably use with particle form, and its average particulate diameter is for being not more than 50 μ m, preferably from 0.1 to 5 μ m.Known pigment (being organic or inorganic) all can adopt.
If wish that this resin combination further also can contain general modifier, for example: stabilizing agent and antistatic additive, but the basic physical property of porous chips of the present invention can not be adversely affected.
The interpolation total amount of these additives can be based on amount from 0.1 to 30% weight of total resin composition, preferably from 1 to 20% weight.
The fusion kneading of resin combination is preferably finished in general double screw extruder, for suitability for industrialized production, preferably " resin " from the hopper feed, and " chemical compound " then infeeds kneading part (middle part of extrusion mechanism), and here resin is plastified by dosing pump.When used " chemical compound " its fusing point is higher than room temperature, makes its liquefaction on its fusing point by being heated to, and inject and mediate the position.
This fused resin combination preferably passes through the gear pump at the top (extruder head) that is arranged on double screw extruder or the single screw extrusion machine that is connected in series on the double screw extruder and is fed forward to die head, and is squeezed into sheet material by die head.
This fused resin combination (chemical compound) also can once be extruded into long filament (or line material) from double screw extruder, and is cut into granule, then this granule is infeeded single screw extrusion machine and is squeezed into sheet material.When this fused resin compound of pelletize, wish before pelletizing, the long filament of being extruded to be stretched with about draw ratio of 1.2 to 1.5.If just the long filament of extruding is carried out pelletizing after cooling, a part " chemical compound " will be oozed out on the surface of long filament sometimes, and makes the feeding of single screw extrusion machine become bad, the processability variation that the result extrudes sheet material.
The extrusion die of sheet material can be the flat-die head, can be annular die head also, and annular die head is preferred to the sheet material productive rate.
In order to obtain high porous chips material productive rate, the cooling condition in the molding, promptly the crystal growth degree (crystalline size) of crystalline polyolefin resin when cooling is very important.For example, the crystallite that forms of ingotism that is formed by super cooling at a slow speed or supper-fast cooling all can influence the even stretching of following stretching step and only form the porous sheet of low-intensity and low-moisture permeability.
Suitable cooling condition is such, be from 0.1 to 3 second the cool time that the temperature of the required temperature that is used for making resin combination when it is extruded by die head reduced to the melt temperature of crystalline polyolefin resin, is from 2 to 20 seconds and be used for making the temperature of resin combination further to reduce to 100 ℃ of required cool times from melt temperature.For example, when the use fusing point was 175 ℃ polypropylene, the melt kneading temperature of resin combination was from 220 ℃ to 240 ℃, and melt temperature is from 158 ℃ to 160 ℃, therefore be from 0.8 to 2.0 second scope last cool time, and back scope one cool time is from 5 to 20 seconds.
The effect of nucleator also is very important.In commercially available crystalline polyolefin resin, some has contained nucleator (as high stiffness and high circulation level), and some does not contain nucleator, but other materials that possess basic one-tenth kernel function are arranged.Do not contain nucleator or to contain nucleator but when not demonstrating the crystalline polyolefin resin of enough nucleating effects, the preferred nucleator that adds in addition using.Any nucleator well known in the prior art all can use, and does not have particular restriction.The example of available nucleator is described in for example Plastics, Vol.43, No.11, pp.113-116 " Functions and Effects ofAdditives for Plastics=Nucleating Agents ", KogyoChosakai Publishing Co., among the Ltd, be incorporated herein this paper as a reference.Preferred example comprises aromatic carboxylic acid's slaine (for example A1-PTBBA), Sorbitol radical derivative, organic phosphate (as, PTBNa), high-melting-point polymerization nucleator, inorganic nucleator (as, Pulvis Talci).
The sheet material of this resin combination is then in machine direction (MD) simple tension or order or simultaneously in MD and laterally (TD) biaxial tension.Stretching on TD can be by stenter, air inflation machine, and core etc. are finished.Draft temperature preferably is not less than room temperature, but is lower than at least 10 ℃ of resin combination fusing points, preferably at least 30 ℃.In order to obtain equilibrated mechanical performance, strength retention ratio, good poisture-penetrability and hydraulic pressure resistance, draw ratio (L/L0; L: the length after the stretching; L0: can be 1.1 at least original length), preferably 1.3 to 6 (during simple tension on the MD or during biaxial tension on MD and the TD).
The preferred poisture-penetrability of porous sheet of the present invention is to 4.0g/100cm from 0.5
2Hr, more preferably 0.8 to 2.5g/100cm
2Hr.Its poisture-penetrability is less than 0.5g/100cm
2The porous sheet of hr is tending towards causing sultry when being used as the back lining materials of absorbent article.Poisture-penetrability surpasses 4.0g/100cm
2The porous sheet of hr has then reduced hydraulic pressure resistance, and trends towards causing leak of liquid.For the back lining materials as absorbent article (as disposable diaper), porous sheet needs 1.5mAq at least, preferred 2.0mAq or more hydraulic pressure resistance.
The tensile yield strength that porous sheet of the present invention preferably has is for being no less than 110kgf/cm
2, more preferably be no less than 120kgf/cm
2, most preferably be no less than 130kgf/cm
2Details are as follows for absorbent article of the present invention.
Absorbent article according to the present invention comprises disposable diaper, is used for incontinent person's underwear and sanitary towel.For example, disposable diaper comprises the absorber that is used to absorb Excreta (for example, urine), topped in absorber surface directly and the surfacing of contact skin, the topped back lining materials that leaks of preventing at the absorber back side, this three part sticks together into as a whole.Part corresponding to waist and lower limb is telescopic, prevents to leak so that closely be adjacent to.This disposable diaper also has fixed function, fixing band for example, low back partly and Attacking Midfielder's part be secured together with it.For easy to use, it is wide that the width of fixing band is generally about 25mm.
Porous sheet of the present invention is used as back lining materials.The thickness of the back lining materials of disposable diaper is generally and is no less than 25 μ m, preferably be no less than 35 μ m (from viewpoint soft, that make resilience essential the diaper and user's the security), and no more than 55 μ m, preferred no more than 45 μ m (from the viewpoint of flexibility and production cost).
In order to make fixing band removably directly adhere on the back lining materials of disposable diaper, and need not be by lap belt, the tensile yield strength that should have as the porous chips of back lining materials preferably is no less than 700gf for being no less than 600gf, more preferably is no less than 800gf (every cm is wide).Therefore, in order to obtain the tensile yield strength of the thick 600gf/cm of 55 μ m, back lining materials should have 109kgf/cm at least
2Intensity.
Like this, yield tensile strength of the present invention is 110kgf/cm
2Or higher porous sheet will demonstrate enough intensity, and be enough to not be included as fixing and lap belt that must use.Owing to there is no need fixing band is adhered to certain location (promptly in the scope of lap belt), then can't just not exist by fixed diaper.Whether this high-intensity back lining materials even the fixing band on adhering to back lining materials are urinated and are not still destroyed when opening in order to adjust the fixed position or to check.When the poisture-penetrability of this back lining materials dropped in the above-mentioned scope, this absorbent article can not bring uncomfortable sultry sensation to user in use.
The present invention illustrates in greater detail with reference now to embodiment, but very obviously the present invention and not meaning that is limited.Unless other explanation is arranged, and all percentage ratio, umber and ratio all are based on weight.
Embodiment 1 to 5 and Comparative Examples 1 and 2
The blending of the manufacturing of porous sheet " resin " and " chemical compound ":
Density as " resin " is 0.91g/cm
3, melt index is that 0.4g/10min, fusing point are that 169 ℃ crystalline polypropylene (" the Chisso HCPPXF1932 " that produced by Chisso Sekigu Kagaku K.K.) is with 270cm
3The speed of/min infeeds hopper.Show in the following Table 1 every kind " chemical compound " (by heating liquefaction) by gear pump with " resin " with " bonded " and ratio be to infeed kneading part (middle part of extruder) at 70: 30.The various samples of " chemical compound ":
Ester (the acid number: 0.1 of " the chemical compound "=phthalic acid of embodiment 1 and stearyl alcohol; Hydroxyl value: 0.2, DSP is made in abbreviation)
" the chemical compound "=phthalic acid of embodiment 2 and the ester of isotrideyl alcohol (" Vinisizer#20 " that is produced by Kao Corporation: DTDP is made in abbreviation)
The ester of " the chemical compound "=benzenetricarboxylic acid of embodiment 3 and 2-ethylhexyl alcohol (" the Trimex T-08 " that is produced by Kao Corporation: TOT is made in abbreviation)
Embodiment 4 " ester of chemical compound=benzenetetracarboxylic acid and 2-ethylhexyl alcohol (produce by Kao Corporation " Pyromex P-08 ": TOP is made in abbreviation)
" the chemical compound "=adipic acid of embodiment 5 and the ester of stearyl alcohol (acid number: 0.2, hydroxyl value: 0.2: DSA is made in abbreviation)
" the chemical compound "=mineral oil of Comparative Examples 1 is (by " the Liquid Paraffin 350S " of Chuo Kasei K.K. production; Burning-point: 220 ℃, aniline point: 112 ℃; Aromatics/naphthenic/alkane=0/34/66: 350S is made in abbreviation)
The ester of " the chemical compound "=benzoic acid of Comparative Examples 2 and 2-ethylhexyl alcohol (" the Vinisizer #80 " that is produced by Kao Corporation: DOP is made in abbreviation)
The physical property of " chemical compound " is presented in the table 1.
The routine ester compounds volatilization temperature of table 1
1)Fusing point
2)
(℃) (℃) embodiment 1 DSP 262 56 embodiment 2 DTDP 248-embodiment 3 TOT 255-embodiment 4 TOP 286-embodiment 5 DSA 267 66 Comparative Examples 1 350S 220-Comparative Examples 2 DOP 203-notes: 1) use by Seiko Denshi Kogyo
K.K. the thermobalance SSC5000TG/DTA200 that makes measures;
2) negative sign (-) is illustrated in and is liquid under the room temperature (20 ℃).The manufacturing of sheet:
Use air cooling blown film extrusion device, it comprises a double screw extruder (diameter: 45mm; L/D=33.5), and through a gear pump be connected to annular die head (diameter: 200mm) on the extruder.Distance between die head and the nip rolls is 4m." resin " infeeds from hopper, " chemical compound " by heating liquefaction by gear pump deliver to double screw extruder in (kneading) portion.
The temperature of extruder is set at: the C1 of machine barrel is (hopper) 190 ℃ partly, 210 ℃ of C2 parts, 240 ℃ of C3 to C8 parts, 230 ℃ of gear pumps, 230 ℃ of die heads.The tubular film bubble is compelled to cooling and uses the air inflation at 20 ℃, blows from vane, batches with the speed of 8m/min, obtains the sheet material of flat wide 60cm, thickness 40 μ m.Stretch processing
The sheet material of gained stretches 1.6 times in 60 ℃ in machine direction by means of the wide roller of 1m, carries out annealing in process then, so that draw ratio is set in 1.5 (with respect to drawing sheet length not).The porous sheet of all gained has the thickness of from 36 to 38 μ m.The evaluation criterion of porous sheet:
The following evaluation of the characteristic of the fertility performance of porous sheet and gained porous sheet.The result of gained is presented in the table 2.1) smoldering during molding:
The situation of smoldering when sheet material is extruded detects by an unaided eye, and according to following standard rating.
◎ ... a bit do not smolder
Zero ... exist a little and smolder
△ ... existence is smoldered,
* ... exist and significantly smolder.2) time of scorch (accumulation):
Measurement forms macroscopic mouthful of mould required time of striped on the extrusion sheet surface.3) sheet material extrusion performance:
Estimate the sheet material extrusion performance by visual observations, and according to following standard rating:
The film bubble that ◎ is stable does not have a mouthful mould striped and occurs
A mouthful mould striped appears in zero stable film bubble
The unstable film bubble of △,
* can not finish molding 4) tensile property
The tensile property of extrusion sheet is according to following standard rating, and " albefaction " that confirmed sheet material is corresponding to stretching.
The ◎ crack-free, evenly albefaction
Zero crack-free, albefaction are inhomogeneous a little
△ crack-free, albefaction are obviously inhomogeneous
* sheet material breaks, and 5) tensile yield strength
To cut drawing sheet with the vertical direction of draw direction, with the wide sample of preparation 10mm, the tensile yield strength of sample is measured with the draw speed of 300mm/min with Tensilon tension test instrument.6) poisture-penetrability
Measure according to JIS Z0208.7) hydraulic pressure resistance
Measure according to JIS L1093B.
Comparative Examples 3
Prepare porous sheet according to the mode identical, except being 0.90g/cm with density with embodiment 1
3, melt index is that 0.5g/10min, fusing point are that 170 ℃ crystalline polypropylene (" the Chisso PP FM101 " that made by Chisso Sekiyu Kagaku K.K.) replaces used " resin " in the example, and replaces DSP with DOP as ester compounds.The result who estimates is presented in the table 2.
Table 2
| Example | Smolder | Time of scorch (hr) | The sheet processability | Draftability | Tensile yield strength (kg/ cm 2) | Poisture-penetrability (g/100 cm 2· hr) | Hydraulic pressure resistance (m Aq) | |
| Embodiment | 1 | ◎ | ＞20 | ◎ | ◎ | 135 | 1.8 | ＞2.0 |
| 2 | ○ | 5 | ◎ | ◎ | 127 | 1.7 | ＞2.0 | |
| 3 | ○ | 8 | ◎ | ◎ | 131 | 1.6 | ＞2.0 | |
| 4 | ◎ | ＞20 | ◎ | ◎ | 135 | 1.5 | ＞2.0 | |
| 5 | ◎ | ＞20 | ◎ | ◎ | 137 | 1.8 | ＞2.0 | |
| Comparative Examples | 1 | × | 0.8 | ◎ | ◎ | 105 | 1.8 | ＞2.0 |
| 2 | × | 0.5 | ○ | ◎ | 94 | 1.7 | ＞2.0 | |
| 3 | × | 0.5 | △ | △ | 68 | 1.2 | ＞2.0 | |
Porous sheet according to the present invention has softish characteristics, high strength, good poisture-penetrability and good leakage prevention capability.Volatile substance few characteristics of smoldering when its molding preparation has molding, the time that therefore forms incipient scorch is very long, has demonstrated good production effect.
Because using this porous sheet can untie by the fixing band of tearing from back lining materials as the disposable diaper of back lining materials, therefore do not need to be used for fixing band lap belt, thereby with the common disposable diaper structure compared with lap belt on simpler, more convenient in the use.
Embodiment 6 and 7 and Comparative Examples 4 and 5
The manufacturing of porous sheet
In embodiment 6 and the Comparative Examples 4, porous sheet prepares in the mode identical with embodiment 1, except being 0.91g/cm with density
3Melt index is 0.5g/10min, fusing point is 168 ℃, and ethylene contents is that crystalline ethylene-propylene-based block copolymer of 8% (being made by Chisso Sekiyu Kagaku K.K.) replaces used " resin " in the example 1, and with the ester (acid number: 0.24 of lauric acid and trimethyl alcohol radical propane; Hydroxyl value: 3.8; TTL made in the back abbreviation) replacement DSP (embodiment 6), or with mineral oil (" the Diana Process Oil PW-90 " that makes by Idemitsu Kosan K.K, burning-point: 272 ℃, aniline point: 127.7 ℃, aromatics/naphthenic/alkane=0/29/71, PW-90 is made in the back abbreviation) (Comparative Examples 4) replacement DSP.
In embodiment 7 and Comparative Examples 5, porous sheet prepares in the mode identical with embodiment 1, replaces DSP except using TTL (embodiment 7) or PW-90 (Comparative Examples 5) respectively.
The volatilization temperature of TTL and PW-90 and fusing point to be measuring with mode identical in table 1 is annotated, and be presented in the table 3.The production rerum natura of porous sheet and the performance of gained porous sheet are estimated in the mode identical with embodiment 1.In addition, the quality of porous sheet is according to following standard evaluation, and the result of gained is presented in the table 4.Estimate the standard of quality:
◎ softness and quality are very thin
Zero softness and quality are better
△ is hard and quality is thick slightly
* hard and quality is thick
Table 3 ester compounds volatilization temperature (℃) fusing point (℃) TTL 261-PW-90 244-
Table 4
| Example | Smolder | Time of scorch (hr) | The sheet processability | Draftability | Quality | Tensile yield strength (kg/ cm 2) | Poisture-penetrability (g/100 cm 2· hr) | Hydraulic pressure resistance (m Aq) | |
| Embodiment | 6 | ◎ | ＞20 | ◎ | ◎ | ◎ | 112 | 1.8 | ＞2.0 |
| 7 | ◎ | ＞20 | ◎ | ◎ | ○ | 126 | 2.0 | ＞2.0 | |
| Comparative Examples | 4 | ○ | 6 | ◎ | ○ | ○ | 102 | 0.1 | ＞2.0 |
| 5 | ○ | 6 | ◎ | ◎ | ○ | 115 | 1.6 | ＞2.0 | |
Embodiment 8 and 9 and Comparative Examples 6 and 7
The manufacturing of inferior property diaper
The disposable diaper that comprises surfacing, absorber, back lining materials and fixing band (no lap belt) prepares in a usual manner, and uses the every kind of porous sheet that is obtained by embodiment 1 and 6 (being respectively embodiment 8 and 9) and Comparative Examples 1 (Comparative Examples 6) and comprise linear low density polyethylene and the common porous sheet of calcium carbonate (Comparative Examples 7) as back lining materials.
When fixing band adheres to when tearing then on the back lining materials, it is easier than removing from Comparative Examples 6 and 7 to remove from the diaper of embodiment 8 and 9.Especially, from the diaper of Comparative Examples 7, can not take fixing band, the back lining materials of can only tearing.The diaper of embodiment 9 demonstrates softness, and sense of touch is very good.
Although the present invention has carried out at length description in conjunction with the embodiments, and is very obvious to this skilled person, without departing from the spirit and scope of the present invention, can also make various improvement and change.
Claims (6)
1. porous sheet, it is prepared by following method, and described method comprises:
Resin combination is molded into sheet material, this resin combination comprise its intramolecularly that the melt index of from 55 to 90 weight portions is not higher than the crystalline polyolefin resin of 3g/10min and from 10 to 45 weight portions contain ester bond, volatilization temperature is not less than 240 ℃ and fusing point and is not higher than 100 ℃ chemical compound under ambient pressure;
At least this sheet material of simple tension.
2. porous sheet as claimed in claim 1, wherein said crystalline polyolefin resin are acrylic resin or propylene-ethylene copolymers resin.
3. claim 1 or 2 porous sheet, wherein said chemical compound is at least a phthalic acid, 1,2 that is selected from, 4-benzenetricarboxylic acid, 1,2,4,5-benzenetetracarboxylic acid and aliphatic polycarboxylic acid's polybasic carboxylic acid and the ester between alkylol.
4. as the porous sheet of claim 1 or 2, wherein said chemical compound is the ester between monocarboxylic acid and polyhydric alcohol.
5. as the porous sheet of claim 1 or 2, the poisture-penetrability of wherein said porous sheet is to 4.0g/100cm from 0.5
2Hr.
6. upper layer of material that comprises fluid permeable, liquid is impermeable by lining material and the absorbent article that is inserted in absorber between the two, it is characterized in that describedly being adopted the described porous sheet of above-mentioned each claim by lining material.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP285242/1993 | 1993-11-15 | ||
| JP285242/93 | 1993-11-15 | ||
| JP28524293 | 1993-11-15 | ||
| JP174443/1994 | 1994-07-26 | ||
| JP17444394A JP3356357B2 (en) | 1993-11-15 | 1994-07-26 | Porous sheet and absorbent article using the same |
| JP174443/94 | 1994-07-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1116954A CN1116954A (en) | 1996-02-21 |
| CN1114450C true CN1114450C (en) | 2003-07-16 |
Family
ID=26496054
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94118398 Expired - Fee Related CN1114450C (en) | 1993-11-15 | 1994-11-15 | Porous sheet and absorbent articles using the same |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP3356357B2 (en) |
| CN (1) | CN1114450C (en) |
| TW (1) | TW341516B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4158004B2 (en) | 2000-06-02 | 2008-10-01 | 新日本理化株式会社 | Porous polypropylene film, method for producing the same, and absorbent article using the film |
-
1994
- 1994-07-26 JP JP17444394A patent/JP3356357B2/en not_active Expired - Fee Related
- 1994-11-09 TW TW083110380A patent/TW341516B/en not_active IP Right Cessation
- 1994-11-15 CN CN 94118398 patent/CN1114450C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3356357B2 (en) | 2002-12-16 |
| TW341516B (en) | 1998-10-01 |
| JPH07179637A (en) | 1995-07-18 |
| CN1116954A (en) | 1996-02-21 |
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Granted publication date: 20030716 Termination date: 20111115 |