JP2020168058A - Laminate - Google Patents
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- JP2020168058A JP2020168058A JP2019069847A JP2019069847A JP2020168058A JP 2020168058 A JP2020168058 A JP 2020168058A JP 2019069847 A JP2019069847 A JP 2019069847A JP 2019069847 A JP2019069847 A JP 2019069847A JP 2020168058 A JP2020168058 A JP 2020168058A
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- woven fabric
- hydrophilic agent
- migration inhibitor
- laminate according
- pulp
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- 239000004745 nonwoven fabric Substances 0.000 claims abstract description 113
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 72
- 238000013508 migration Methods 0.000 claims abstract description 41
- 230000005012 migration Effects 0.000 claims abstract description 41
- 239000003112 inhibitor Substances 0.000 claims abstract description 40
- 239000012209 synthetic fiber Substances 0.000 claims abstract description 32
- 229920002994 synthetic fiber Polymers 0.000 claims abstract description 32
- 238000003860 storage Methods 0.000 claims abstract description 17
- 239000007787 solid Substances 0.000 claims abstract description 4
- 230000002745 absorbent Effects 0.000 claims description 32
- 239000002250 absorbent Substances 0.000 claims description 32
- 239000000835 fiber Substances 0.000 claims description 27
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 5
- 239000000377 silicon dioxide Substances 0.000 claims description 5
- 239000004744 fabric Substances 0.000 claims description 2
- 230000007423 decrease Effects 0.000 abstract description 6
- 230000007774 longterm Effects 0.000 abstract description 5
- 239000000463 material Substances 0.000 description 18
- 210000001124 body fluid Anatomy 0.000 description 15
- 239000010839 body fluid Substances 0.000 description 15
- 239000007788 liquid Substances 0.000 description 15
- -1 polypropylene Polymers 0.000 description 13
- 238000010521 absorption reaction Methods 0.000 description 12
- 239000002585 base Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 12
- 238000012546 transfer Methods 0.000 description 10
- 239000006096 absorbing agent Substances 0.000 description 8
- 229920005989 resin Polymers 0.000 description 8
- 239000011347 resin Substances 0.000 description 8
- 239000010410 layer Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 6
- 239000001913 cellulose Substances 0.000 description 6
- 229920002678 cellulose Polymers 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- 230000035699 permeability Effects 0.000 description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 5
- 239000004743 Polypropylene Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 239000002131 composite material Substances 0.000 description 5
- 239000011521 glass Substances 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 229920001155 polypropylene Polymers 0.000 description 5
- 239000011230 binding agent Substances 0.000 description 4
- 229920000247 superabsorbent polymer Polymers 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000002121 nanofiber Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 239000005871 repellent Substances 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- LYRFLYHAGKPMFH-UHFFFAOYSA-N octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(N)=O LYRFLYHAGKPMFH-UHFFFAOYSA-N 0.000 description 2
- 229920001707 polybutylene terephthalate Polymers 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 238000000371 solid-state nuclear magnetic resonance spectroscopy Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- CTTJWXVQRJUJQW-UHFFFAOYSA-N 2,2-dioctyl-3-sulfobutanedioic acid Chemical compound CCCCCCCCC(C(O)=O)(C(C(O)=O)S(O)(=O)=O)CCCCCCCC CTTJWXVQRJUJQW-UHFFFAOYSA-N 0.000 description 1
- HVYJSOSGTDINLW-UHFFFAOYSA-N 2-[dimethyl(octadecyl)azaniumyl]acetate Chemical compound CCCCCCCCCCCCCCCCCC[N+](C)(C)CC([O-])=O HVYJSOSGTDINLW-UHFFFAOYSA-N 0.000 description 1
- FEIQOMCWGDNMHM-UHFFFAOYSA-N 5-phenylpenta-2,4-dienoic acid Chemical compound OC(=O)C=CC=CC1=CC=CC=C1 FEIQOMCWGDNMHM-UHFFFAOYSA-N 0.000 description 1
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 238000011088 calibration curve Methods 0.000 description 1
- 239000003093 cationic surfactant Substances 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 229920006026 co-polymeric resin Polymers 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- GWTCIAGIKURVBJ-UHFFFAOYSA-L dipotassium;dodecyl phosphate Chemical compound [K+].[K+].CCCCCCCCCCCCOP([O-])([O-])=O GWTCIAGIKURVBJ-UHFFFAOYSA-L 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 229960000878 docusate sodium Drugs 0.000 description 1
- TVACALAUIQMRDF-UHFFFAOYSA-N dodecyl dihydrogen phosphate Chemical compound CCCCCCCCCCCCOP(O)(O)=O TVACALAUIQMRDF-UHFFFAOYSA-N 0.000 description 1
- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 239000004715 ethylene vinyl alcohol Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- RZXDTJIXPSCHCI-UHFFFAOYSA-N hexa-1,5-diene-2,5-diol Chemical compound OC(=C)CCC(O)=C RZXDTJIXPSCHCI-UHFFFAOYSA-N 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- 239000004750 melt-blown nonwoven Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 239000002504 physiological saline solution Substances 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920001451 polypropylene glycol Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 230000035807 sensation Effects 0.000 description 1
- 230000001568 sexual effect Effects 0.000 description 1
- ZFDPAZDODACYOG-UHFFFAOYSA-M sodium;[(1,5-dimethyl-3-oxo-2-phenylpyrazol-4-yl)amino]methanesulfonate Chemical compound [Na+].CN1C(C)=C(NCS([O-])(=O)=O)C(=O)N1C1=CC=CC=C1 ZFDPAZDODACYOG-UHFFFAOYSA-M 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 150000003460 sulfonic acids Chemical class 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- XLOMVQKBTHCTTD-UHFFFAOYSA-N zinc oxide Inorganic materials [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 1
Abstract
Description
本発明は、積層体及びそれを備えた吸収性物品に関する。 The present invention relates to a laminate and an absorbent article comprising the laminate.
使い捨ておむつや生理用ナプキン等の吸収性物品は、着用者から排泄された体液を吸収体で吸収して保持する機能を有している。このような吸収性物品において、吸収された体液が着用者の身体側に逆戻りすることは、極力防止する必要がある。吸収体で体液を保持し逆戻りを極力防止する方法として、例えば吸収体の肌対向面側に位置する表面材不織布に親水化剤によって親水性を付与し、繰り返し体液が通過しても液の透過性の制御を維持することが行われている（例えば、特許文献１）。 Absorbent articles such as disposable diapers and sanitary napkins have a function of absorbing and retaining body fluid excreted from the wearer by the absorber. In such an absorbent article, it is necessary to prevent the absorbed body fluid from returning to the wearer's body side as much as possible. As a method of retaining the body fluid in the absorber and preventing reversion as much as possible, for example, the surface material non-woven fabric located on the skin facing surface side of the absorber is made hydrophilic by a hydrophilic agent, and the liquid permeates even if the body fluid repeatedly passes through. Maintaining sexual control has been performed (eg, Patent Document 1).
一般的に吸収体の肌対向面側に位置する不織布は、ポリプロピレンなどの疎水性の合成樹脂の繊維から構成されているため、親水化剤等の繊維処理剤が付与されている。親水化剤は体液に作用することから、低融点の成分や繊維表面において流動性が比較的高い成分が用いられる。そのため、体液に触れる前の未使用の状態においても、隣接する部材に不織布から親水化剤が移行し易いという課題が、本発明者により見出された。 Generally, the non-woven fabric located on the skin-facing surface side of the absorber is composed of fibers of a hydrophobic synthetic resin such as polypropylene, and therefore a fiber treatment agent such as a hydrophilic agent is applied. Since the hydrophilic agent acts on body fluids, a component having a low melting point or a component having relatively high fluidity on the fiber surface is used. Therefore, the present inventor has found a problem that the hydrophilic agent is easily transferred from the non-woven fabric to the adjacent member even in an unused state before coming into contact with the body fluid.
不織布を構成するポリプロピレン等の合成繊維は、パルプよりも表面張力が小さいため、パルプを含む吸収体が隣接する場合、そのパルプ繊維への親水化剤の移行が顕著である。このため、吸収性物品を使用前に長期間保存すると、不織布内の親水化剤が吸収体に移行して不織布の親水性が低下する。不織布が撥水化した吸収性物品が使用に供されると、体液の一部は吸収体まで到達せずに不織布を含んだ肌対抗面側で拡がり保持され、容易に肌へ逆戻りすることがある。 Since the surface tension of synthetic fibers such as polypropylene constituting the non-woven fabric is smaller than that of pulp, when an absorber containing pulp is adjacent to the synthetic fiber, the transfer of the hydrophilic agent to the pulp fiber is remarkable. Therefore, when the absorbent article is stored for a long period of time before use, the hydrophilic agent in the non-woven fabric is transferred to the absorbent body and the hydrophilicity of the non-woven fabric is lowered. When an absorbent article in which the non-woven fabric is made water-repellent is used, a part of the body fluid does not reach the absorber but spreads and is held on the side facing the skin containing the non-woven fabric, and easily returns to the skin. is there.
本発明は、長期保存後においても親水性の低下を抑制できる積層体に関する。 The present invention relates to a laminate capable of suppressing a decrease in hydrophilicity even after long-term storage.
本発明は、合成繊維を含む不織布と、前記不織布に隣接するパルプ含有層とを備え、前記不織布は、前記合成繊維を親水化する親水化剤と、前記合成繊維より表面張力が大きい固体状の移行阻害剤とを有する積層体を提供する。 The present invention comprises a non-woven fabric containing synthetic fibers and a pulp-containing layer adjacent to the non-woven fabric, and the non-woven fabric is a solid state having a hydrophilic agent for hydrophilizing the synthetic fibers and a surface tension larger than that of the synthetic fibers. Provided is a laminate having a migration inhibitor.
本発明に係る積層体は、長期保存後においても親水性の低下を抑制することができる。 The laminate according to the present invention can suppress a decrease in hydrophilicity even after long-term storage.
以下、添付の図面を参照して、本発明の実施形態に係る積層体を詳細に説明する。本実施形態に係る積層体を含む吸収性物品１０は、図１に示すように、パルプ含有層からなる吸収性コア１２と、吸収性コア１２を包囲するコアラップ不織布１４と、コアラップ不織布１４の表面に配置された表面材不織布１６とを備える。 Hereinafter, the laminate according to the embodiment of the present invention will be described in detail with reference to the accompanying drawings. As shown in FIG. 1, the absorbent article 10 including the laminate according to the present embodiment includes an absorbent core 12 made of a pulp-containing layer, a core wrap nonwoven fabric 14 surrounding the absorbent core 12, and a surface of the core wrap nonwoven fabric 14. The surface material non-woven fabric 16 arranged in the above is provided.
吸収性コア１２とコアラップ不織布１４は、図２に示すように、隣接して積層体２０を構成している。積層体２０における吸収性コア１２は、パルプ２２と高吸水性高分子（Ｓｕｐｅｒ Ａｂｓｏｒｂｅｎｔ Ｐｏｌｙｍｅｒ；ＳＡＰ）２４とを含んでいる。コアラップ不織布１４は、典型的には、合成繊維３２を含むスパンボンド不織布、メルトブロー不織布、またはＳＭＳ不織布などを基材不織布とする。 As shown in FIG. 2, the absorbent core 12 and the core wrap non-woven fabric 14 form a laminated body 20 adjacent to each other. The absorbent core 12 in the laminate 20 contains a pulp 22 and a super absorbent polymer (SAP) 24. The core wrap non-woven fabric 14 typically uses a spunbonded non-woven fabric containing synthetic fibers 32, a melt-blown non-woven fabric, an SMS non-woven fabric, or the like as a base non-woven fabric.
基材不織布としては、公知の各種製法による不織布を用いることができる。例えば、カード法又はエアレイド法により形成した短繊維ウエブを、熱風で処理して不織布化したエアスルー不織布が挙げられる。また、カード法又はエアレイド法により形成した繊維ウエブを水流交絡により不織布化したスパンレース不織布、スパンメルト不織布、ニードルパンチ不織布、カード法又はエアレイド法により形成した繊維ウエブをヒートロールによる部分的な熱処理により不織布化したヒートロール不織布等の長繊維を主体とする不織布を用いてもよい。これらの中でも、薄くて柔らかく適度な通液性が得られることから、長繊維を主体とする不織布が好ましい。長繊維を主体とする不織布は、吸収性がよく、安価に製造できる。 As the base non-woven fabric, a non-woven fabric produced by various known manufacturing methods can be used. For example, an air-through non-woven fabric obtained by treating a short fiber web formed by a card method or an air-laid method with hot air to make a non-woven fabric can be mentioned. In addition, spunlace non-woven fabric, spunmelt non-woven fabric, needle punch non-woven fabric, and fiber web formed by the curd method or air-laid method are non-woven fabric by partial heat treatment by heat roll. A non-woven fabric mainly composed of long fibers such as a heat-rolled non-woven fabric may be used. Among these, a non-woven fabric mainly composed of long fibers is preferable because it is thin, soft and has appropriate liquid permeability. Nonwoven fabrics mainly composed of long fibers have good absorbency and can be manufactured at low cost.
スパンメルト不織布としては、例えば、スパンボンド不織布、スパンボンド−スパンボンド不織布（ＳＳ不織布）、スパンボンド−スパンボンド−スパンボンド不織布（ＳＳＳ不織布）、スパンボンド−メルトブローン−スパンボンド不織布（ＳＭＳ不織布）、スパンボンド−メルトブローン−メルトブローン−スパンボンド不織布（ＳＭＭＳ不織布）等が挙げられる。 Examples of the spunmelt non-woven fabric include spunbond non-woven fabric, spunbond-spunbond non-woven fabric (SS non-woven fabric), spunbond-spunbond-spunbond non-woven fabric (SSS non-woven fabric), spunbond-melt blown-spunbond non-woven fabric (SMS non-woven fabric), and span. Examples thereof include bond-melt blown-melt blown-spunbond non-woven fabric (SMMS non-woven fabric).
コアラップ不織布１４に含まれる合成繊維３２としては、熱可塑性樹脂を用いることが好ましく、例えば、ポリエチレン（ＰＥ）、ポリプロピレン（ＰＰ）等のポリオレフィン、ポリエチレンテレフタレート（ＰＥＴ）、ポリブチレンテレフタレート（ＰＢＴ）等のポリエステル、ナイロン等のポリアミド等が挙げられる。これらの樹脂は、単独でも２種以上を組み合わせて用いてもよい。２種以上を組み合わせて用いる態様としては、例えば複数の樹脂のブレンドが挙げられる。また、芯鞘型やサイド・バイ・サイド型などの複合繊維として用いることもできる。芯鞘型の複合繊維は、鞘部の樹脂の融点が芯部の樹脂の融点よりも低いことが好ましい。
合成繊維３２の繊維長は、３０ｍｍ以上であることが好ましく、５０ｍｍ以上であることがより好ましく、連続した長繊維であることが最も好ましい。繊維長が長いほど、高強度で薄く柔らかい不織布が得られる。
As the synthetic fiber 32 contained in the core wrap non-woven fabric 14, it is preferable to use a thermoplastic resin, for example, polyolefins such as polyethylene (PE) and polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT) and the like. Examples thereof include polyamides such as polyester and nylon. These resins may be used alone or in combination of two or more. Examples of a mode in which two or more types are used in combination include a blend of a plurality of resins. It can also be used as a composite fiber such as a core sheath type or a side-by-side type. In the core-sheath type composite fiber, the melting point of the resin in the sheath portion is preferably lower than the melting point of the resin in the core portion.
The fiber length of the synthetic fiber 32 is preferably 30 mm or more, more preferably 50 mm or more, and most preferably continuous long fibers. The longer the fiber length, the stronger, thinner and softer the non-woven fabric can be obtained.
合成繊維３２の繊維径は、１μｍ以上であることが好ましく、５μｍ以上であることがより好ましく、１０μｍ以上であることが最も好ましい。この下限以上とすることで、液の透過性に必要な繊維間距離を担保することができる。繊維径は、５０μｍ以下であることが好ましく、３０μｍ以下であることがより好ましく、２５μｍ以下であることが最も好ましい。この上限以下とすることで、風合いの良好な不織布となる。 The fiber diameter of the synthetic fiber 32 is preferably 1 μm or more, more preferably 5 μm or more, and most preferably 10 μm or more. By setting this lower limit or more, the distance between fibers required for liquid permeability can be secured. The fiber diameter is preferably 50 μm or less, more preferably 30 μm or less, and most preferably 25 μm or less. By setting the content below this upper limit, a non-woven fabric having a good texture can be obtained.
コアラップ不織布１４は、おむつ加工や使用者の着用に耐える強度を考慮すると、坪量が５ｇ／ｍ2以上であることが好ましく、８ｇ／ｍ2以上であることがより好ましい。また、液の透過性や風合いを十分に確保するために、コアラップ不織布１４の坪量は、２０ｇ／ｍ2以下であることが好ましく、１５ｇ／ｍ2以下であることがより好ましい。 The core wrap non-woven fabric 14 preferably has a basis weight of 5 g / m 2 or more, and more preferably 8 g / m 2 or more, in consideration of the strength to withstand diaper processing and wearing by the user. Further, in order to sufficiently secure the permeability and texture of the liquid, the basis weight of the core wrap non-woven fabric 14 is preferably 20 g / m 2 or less, and more preferably 15 g / m 2 or less.
本実施形態に係る積層体において、コアラップ不織布１４には、コアラップ不織布を親水化させるために、親水化剤が含まれている。親水化剤は、基本的には合成繊維３２の表面に付着している。親水化剤としては、通常、吸収性物品の不織布に用いられている繊維処理剤のうち、親水性を付与するための液状の一般的な化合物を用いることができる。 In the laminate according to the present embodiment, the core wrap non-woven fabric 14 contains a hydrophilizing agent in order to make the core wrap non-woven fabric hydrophilic. The hydrophilizing agent is basically attached to the surface of the synthetic fiber 32. As the hydrophilic agent, a general liquid compound for imparting hydrophilicity can be used among the fiber treatment agents usually used for non-woven fabrics of absorbent articles.
ここで「液状」とは、融点が４５℃以下であるもの、及び、融点が４５℃以下でなくても流動性を有するものをいう。本明細書において流動性を有するとは、親水化剤のサンプルを傾けた際に、流動、変形することをいう。具体的には、水平に置いたガラス板の表面に６０℃の親水化剤０．５ｇを滴下して静置し、３０秒経過後にガラス板を水平から４５°傾けて液滴を観察する。傾けてから１分後に液滴の外周位置が、ガラス板の斜面下方に静置後から３ｍｍ以上移動した場合と定める。なお、液滴の形成及びそれ以降の操作は、２３℃、相対湿度５０％、無風の環境下で行う。 Here, the term "liquid" refers to a liquid having a melting point of 45 ° C. or lower and having a fluidity even if the melting point is not 45 ° C. or lower. In the present specification, having fluidity means that when a sample of a hydrophilic agent is tilted, it flows and deforms. Specifically, 0.5 g of a hydrophilic agent at 60 ° C. is dropped on the surface of a glass plate placed horizontally and allowed to stand, and after 30 seconds have passed, the glass plate is tilted 45 ° from the horizontal to observe the droplets. It is defined as the case where the outer peripheral position of the droplet moves 3 mm or more below the slope of the glass plate after standing still one minute after tilting. The formation of droplets and subsequent operations are performed in an environment of 23 ° C., a relative humidity of 50%, and no wind.
使用し得る親水化剤としては、例えばポリオキシアルキレン変性シリコーン、アルキルリン酸エステルのアルカリ金属塩、ＰＯＥ多価アルコール脂肪酸エステル、アルキルベタイン、アルキルスルホン酸、アルキル硫酸、ジアルキルスルホン酸、ＰＯＥアルキルアミド、イミダゾリウム型のカチオン界面活性剤、ポリエチレングリコール、ポリプロピレングリコール、ＰＯＥ（付加モル数３）ラウリルフフォスフェートカリウム塩、及びＰＯＥ（付加モル数１）ステアリルアミドなどが挙げられる。 Examples of the hydrophilizing agent that can be used include polyoxyalkylene-modified silicones, alkali metal salts of alkyl phosphates, POE polyhydric alcohol fatty acid esters, alkyl betaines, alkyl sulfonic acids, alkyl sulfuric acids, dialkyl sulfonic acids, POE alkyl amides, and the like. Examples thereof include imidazolium-type cationic surfactants, polyethylene glycol, polypropylene glycol, POE (additional number of moles 3) lauryl fluorufphosphate potassium salt, and POE (additional number of moles 1) stearylamide.
親水化剤は、不織布を体液が通過する際に溶解・拡散して、不織布内での体液の透過性や拡散性を向上させる。一方、親水化剤は、液状であるため、体液が不織布を通過する前の状態でも不織布に隣接する他の材料へ移行することが可能であり、特に隣接する材料がパルプ等のセルロース素材であると不織布から移行し易いことが分かった。本発明の発明者は、鋭意検討を行ったところ、このような親水化剤の移行が、親水化剤に接触する材料の表面張力の差に起因することを見出した。パルプは、合成繊維より表面張力が大きいため、親水化剤を合成繊維の表面から引き離して保持する。その結果、パルプ含有層と接している不織布表層の親水化剤が減少して不織布が撥水化し、体液の透過性が低下することになる。 The hydrophilic agent dissolves and diffuses when the body fluid passes through the non-woven fabric, and improves the permeability and diffusivity of the body fluid in the non-woven fabric. On the other hand, since the hydrophilic agent is a liquid, it can be transferred to another material adjacent to the non-woven fabric even before the body fluid has passed through the non-woven fabric, and the adjacent material is a cellulose material such as pulp. It was found that it was easy to move from the non-woven fabric. As a result of diligent studies, the inventor of the present invention has found that such migration of the hydrophilic agent is due to the difference in surface tension of the material in contact with the hydrophilic agent. Since pulp has a higher surface tension than synthetic fibers, it pulls and holds the hydrophilic agent from the surface of the synthetic fibers. As a result, the hydrophilicizing agent on the surface layer of the non-woven fabric in contact with the pulp-containing layer is reduced, the non-woven fabric becomes water-repellent, and the permeability of the body fluid is lowered.
本実施形態に係る積層体において、コアラップ不織布１４には、親水化剤の他に移行阻害剤３６が含まれている。移行阻害剤３６は、合成繊維３２より大きな表面張力を有する固体であり、その少なくとも一部は親水化剤とともに合成繊維３２の表面に付着している。移行阻害剤３６がコアラップ不織布１４中に含有されているので、コアラップ不織布１４内に親水化剤を留めて、吸収性コア１２への親水化剤の移行を阻害する。移行阻害剤３６が細孔を有する場合、すなわち所定のＢＥＴ比表面積を有する場合には、細孔に親水化剤を担持して保持できるので、親水化剤の移行は効果的に抑制される。 In the laminate according to the present embodiment, the core wrap nonwoven fabric 14 contains a migration inhibitor 36 in addition to the hydrophilic agent. The migration inhibitor 36 is a solid having a higher surface tension than the synthetic fiber 32, and at least a part thereof is attached to the surface of the synthetic fiber 32 together with the hydrophilic agent. Since the transfer inhibitor 36 is contained in the core wrap non-woven fabric 14, the hydrophilic agent is retained in the core wrap non-woven fabric 14 to inhibit the transfer of the hydrophilic agent to the absorbent core 12. When the migration inhibitor 36 has pores, that is, when it has a predetermined BET specific surface area, the hydrophilic agent can be supported and retained in the pores, so that the migration of the hydrophilic agent is effectively suppressed.
親水剤の移行が抑制された程度は、後述する［親水化剤の残存率の測定］により測定した親水化剤の残存率によって評価することができる。親水化剤の残存率は、２０％以上であることが好ましく、３０％以上であることがより好ましく、５０％以上であることがさらに好ましく、１００％であることが最も好ましい。また、保存後の液滴吸収率は３０％以上であることが好ましく、６０％以上であることがより好ましく、８０％以上であることがさらに好ましく、１００％であることが最も好ましい。 The degree to which the transfer of the hydrophilic agent is suppressed can be evaluated by the residual rate of the hydrophilic agent measured by [Measurement of residual rate of the hydrophilic agent] described later. The residual ratio of the hydrophilic agent is preferably 20% or more, more preferably 30% or more, further preferably 50% or more, and most preferably 100%. The droplet absorption rate after storage is preferably 30% or more, more preferably 60% or more, further preferably 80% or more, and most preferably 100%.
上述のとおり、吸収性コア１２中のパルプ２２はセルロース素材であるので、コアラップ不織布１４中の合成繊維３２より表面張力が大きい。移行阻害剤３６が存在しない場合、親水化剤は、パルプ２２と合成繊維３２の表面張力の違いに起因して吸収性コア１２に移行し、コアラップ不織布１４の親水性が低下する。本発明によれば、親水化剤をコアラップ不織布１４内に留めることで吸収性コア１２への移行が阻止されるので、コアラップ不織布１４の親水性の低下を抑制することが可能となった。 As described above, since the pulp 22 in the absorbent core 12 is a cellulose material, the surface tension is larger than that of the synthetic fiber 32 in the core wrap non-woven fabric 14. In the absence of the migration inhibitor 36, the hydrophilic agent migrates to the absorbent core 12 due to the difference in surface tension between the pulp 22 and the synthetic fiber 32, and the hydrophilicity of the core wrap non-woven fabric 14 decreases. According to the present invention, by retaining the hydrophilic agent in the core wrap non-woven fabric 14, the transfer to the absorbent core 12 is prevented, so that it is possible to suppress the decrease in hydrophilicity of the core wrap non-woven fabric 14.
合成繊維３２より表面張力の大きな移行阻害剤３６としては、例えば、無機粉が挙げられる。無機粉としては、具体的には、シリカ、炭酸カルシウム、及び酸化チタン等が挙げられ、特にシリカが好ましい。無機粉の粒子径は、合成繊維３２の繊維径より小さいことが望まれるが、コアラップ不織布１４の厚さを超えなければ、繊維径より大きな粒子径の無機粉を用いることもでき、凝集体であってもよい。因みに、シリカの表面張力は２６０ｍＮ／ｍ程度であり、コアラップ不織布１４に用いられている合成繊維３２の表面張力は、２０〜４０ｍＮ／ｍ程度である。 Examples of the migration inhibitor 36 having a higher surface tension than the synthetic fiber 32 include inorganic powder. Specific examples of the inorganic powder include silica, calcium carbonate, titanium oxide and the like, and silica is particularly preferable. It is desirable that the particle size of the inorganic powder is smaller than the fiber diameter of the synthetic fiber 32, but if the thickness of the core wrap non-woven fabric 14 is not exceeded, an inorganic powder having a particle size larger than the fiber diameter can be used, and the aggregate can be used. There may be. Incidentally, the surface tension of silica is about 260 mN / m, and the surface tension of the synthetic fiber 32 used in the core wrap non-woven fabric 14 is about 20 to 40 mN / m.
また、移行阻害剤３６として、セルロースナノファイバーを用いることもできる。セルロースナノファイバーの繊維径は、１μｍ以下であることが好ましい。セルロースナノファイバーはセルロース組成物のため、その表面張力はパルプと同等の４６ｍＮ／ｍ程度である。 In addition, cellulose nanofibers can also be used as the migration inhibitor 36. The fiber diameter of the cellulose nanofibers is preferably 1 μm or less. Since the cellulose nanofiber is a cellulose composition, its surface tension is about 46 mN / m, which is equivalent to that of pulp.
親水化剤を吸着・担持することを考慮すると、移行阻害剤３６のＢＥＴ比表面積は２０ｍ2／ｇ以上であることが好ましく、５０ｍ2／ｇ以上であることがより好ましく、１００ｍ2／ｇ以上であることが最も好ましい。移行阻害剤３６は、ＢＥＴ比表面積が大きいほど、より多量の親水化剤を移行阻害剤の粒子表面や細孔に吸着・担持でき、吸収性コア１２への親水化剤の移行を阻害する効果が向上する。一方で、体液への親水化剤の溶解・拡散等の作用を促し、十分な親水性を得るため、１８００ｍ2／ｇ程度を上限とすることが好ましい。 Considering the adsorption and support of the hydrophilic agent, the BET specific surface area of the migration inhibitor 36 is preferably 20 m 2 / g or more, more preferably 50 m 2 / g or more, and 100 m 2 / g or more. Is most preferable. The larger the BET specific surface area, the more the migration inhibitor 36 can adsorb and support a larger amount of the hydrophilic agent on the particle surface and pores of the migration inhibitor, and has the effect of inhibiting the migration of the hydrophilic agent to the absorbent core 12. Is improved. On the other hand, it is preferable that the upper limit is about 1800 m 2 / g in order to promote actions such as dissolution and diffusion of the hydrophilic agent in the body fluid and obtain sufficient hydrophilicity.
移行阻害剤３６として、シリカ・アルミナ・酸化亜鉛複合体のような複合材料を用いることもできる。こうした複合材料からなる移行阻害剤の場合には、主成分（最も比率の大きい素材）の表面張力が、合成繊維３２の表面張力より大きければ良い。 As the migration inhibitor 36, a composite material such as a silica-alumina-zinc oxide composite can also be used. In the case of a migration inhibitor composed of such a composite material, the surface tension of the main component (material having the largest ratio) may be larger than the surface tension of the synthetic fiber 32.
移行阻害剤３６は、バインダーを介して合成繊維３２表面に付着していることが好ましい。バインダーとしては、例えば、ポリアクリルアミド樹脂、スチレン-アクリル酸共重合樹脂、ポリエステルやポリオレフィン、酢酸ビニル、ポリウレタン、ラテックスのエマルジョン系樹脂、エチレンビニルアルコール樹脂、ポリビニルアルコール樹脂、澱粉等が挙げられる。移行阻害剤３６は、合成繊維３２の表面に付着せずにバインダーを介して合成繊維３２の表面に付着した状態で、コアラップ不織布１４中に存在していてもよい。 The migration inhibitor 36 is preferably attached to the surface of the synthetic fiber 32 via a binder. Examples of the binder include polyacrylamide resin, styrene-acrylic acid copolymer resin, polyester and polyolefin, vinyl acetate, polyurethane, latex emulsion resin, ethylene vinyl alcohol resin, polyvinyl alcohol resin, starch and the like. The migration inhibitor 36 may be present in the core wrap non-woven fabric 14 in a state of being attached to the surface of the synthetic fiber 32 via the binder without being attached to the surface of the synthetic fiber 32.
一般に、表面材には肌触り等の触感が求められることから、エアスルー不織布等の厚手の不織布が用いられている。これに対し、コアラップ不織布１４に用いられている長繊維不織布は、体液を吸収体へ通すための高い透過性が求められる。こうした長繊維不織布は、坪量が２０ｇ／ｍ2以下と小さく、厚さが２５０μｍ以下と薄い。このため、隣接するパルプ含有層と接する不織布表層からの親水化剤の移行の影響は、厚手の不織布に比べると大きい。このような長繊維不織布においては、所定の移行阻害剤３６を配合して親水化剤の移行を阻害するという機能を、より顕著に発揮させることができる。特に、坪量が１５ｇ／ｍ2以下のスパンメルト不織布の場合、親水化剤の移行を阻害する機能をより顕著に発揮させることができる。 In general, a thick non-woven fabric such as an air-through non-woven fabric is used because the surface material is required to have a tactile sensation such as touch. On the other hand, the long-fiber non-woven fabric used in the core-wrap non-woven fabric 14 is required to have high permeability for passing body fluid through the absorber. Such a long fiber non-woven fabric has a small basis weight of 20 g / m 2 or less and a thin thickness of 250 μm or less. Therefore, the influence of the transfer of the hydrophilic agent from the surface layer of the non-woven fabric in contact with the adjacent pulp-containing layer is larger than that of the thick non-woven fabric. In such a long-fiber non-woven fabric, the function of blending a predetermined migration inhibitor 36 to inhibit the migration of the hydrophilic agent can be more remarkably exhibited. In particular, in the case of a spunmelt non-woven fabric having a basis weight of 15 g / m 2 or less, the function of inhibiting the migration of the hydrophilic agent can be exhibited more remarkably.
ここで、親水化剤とともに移行阻害剤３６を含むコアラップ不織布１４の製造方法について説明する。移行阻害剤３６は、親水化剤とともに基材不織布に含浸させて、基材不織布内の合成繊維３２の表面に付着させることができる。具体的には、親水化剤０．２質量％、移行阻害剤０．２質量％を含有する塗布液を調製し、その中に基材不織布を浸漬する。なお、移行阻害剤３６は、水に分散させて２質量％程度の分散液とし、所定のバインダーを加えておくことが好ましい。 Here, a method for producing the core wrap nonwoven fabric 14 containing the transfer inhibitor 36 together with the hydrophilic agent will be described. The migration inhibitor 36 can be impregnated into the base non-woven fabric together with the hydrophilic agent and adhered to the surface of the synthetic fiber 32 in the base non-woven fabric. Specifically, a coating liquid containing 0.2% by mass of a hydrophilic agent and 0.2% by mass of a migration inhibitor is prepared, and the base non-woven fabric is immersed therein. It is preferable that the migration inhibitor 36 is dispersed in water to prepare a dispersion liquid of about 2% by mass, and a predetermined binder is added.
塗布液に浸漬後の基材不織布を、所定の圧力で加圧された２本のゴムロール間を通して脱水し、さらに６０〜１２０℃で１〜１０分間乾燥することで、親水化剤とともに移行阻害剤３６を含むコアラップ不織布１４が得られる。コアラップ不織布１４においては、移行阻害剤３６の質量（ｍi）と親水化剤の質量（ｍh）との比（ｍi／ｍh）が０．１以上であることが好ましい。比（ｍi／ｍh）は、０．３以上であることがより好ましく、０．５以上であることが最も好ましい。塗布液中の各成分の濃度を調節することで、所望の比を達成することができる。
基材不織布に対する親水化剤の不揮発分の割合（ＯＰＵ）は、０．０５〜２質量％であることが好ましい。
The base non-woven fabric after being immersed in the coating liquid is dehydrated by passing it between two rubber rolls pressurized at a predetermined pressure, and further dried at 60 to 120 ° C. for 1 to 10 minutes to form a transfer inhibitor together with a hydrophilic agent. A core wrap non-woven fabric 14 containing 36 is obtained. In core wrap nonwoven 14 is preferably a ratio of the mass migration inhibitor 36 (m i) the mass of the hydrophilizing agent (m h) (m i / m h) is 0.1 or more. The ratio ( mi / m h ) is more preferably 0.3 or more, and most preferably 0.5 or more. A desired ratio can be achieved by adjusting the concentration of each component in the coating liquid.
The ratio of the non-volatile content (OPU) of the hydrophilic agent to the base non-woven fabric is preferably 0.05 to 2% by mass.
吸収性物品によっては、吸収性コア以外にもパルプ含有層が含まれる場合がある。例えば、図４に示す吸収性物品１０Ａにおいては、吸収性コア１２を包囲するコアラップ台紙１８がパルプ含有層である。吸収性物品１０Ａの吸収性コア１２には、ＳＡＰ２４が含まれている。吸収性物品１０Ａの場合には、表面材不織布１６とコアラップ台紙１８とが隣接した積層体が、領域Ｌ２に存在する。表面材不織布１６は、上述したコアラップ不織布と同様に親水化剤により親水化されている。 Depending on the absorbent article, a pulp-containing layer may be contained in addition to the absorbent core. For example, in the absorbent article 10A shown in FIG. 4, the core wrap mount 18 surrounding the absorbent core 12 is the pulp-containing layer. The absorbent core 12 of the absorbent article 10A contains the SAP 24. In the case of the absorbent article 10A, a laminate in which the surface material non-woven fabric 16 and the core wrap mount 18 are adjacent to each other exists in the region L2. The surface material nonwoven fabric 16 is hydrophilized by a hydrophilic agent in the same manner as the core wrap nonwoven fabric described above.
表面材不織布１６は、一般的には短繊維を含むエアスルー不織布や、スパンメルト不織布であり、コアラップ不織布より坪量が大きく厚い。こうした積層体においても、長期間保存すると、表面材不織布１６からコアラップ台紙１８への親水化剤の移行が生じるおそれがある。親水化剤が移行して表面材不織布１６が撥水化すると、吸収体への体液の透過吸収が妨げられ表面材上で液が広く拡散して、肌へ体液が長時間付着するなど吸収性物品１０Ａの性能が低下する。上述のような移行阻害剤を表面材不織布１６内に含有させることにより、親水化剤の移行を阻害して表面材不織布の撥水化を抑制することができる。 The surface material nonwoven fabric 16 is generally an air-through nonwoven fabric containing short fibers or a spunmelt nonwoven fabric, and has a larger basis weight and is thicker than the core wrap nonwoven fabric. Even in such a laminated body, if it is stored for a long period of time, the hydrophilic agent may be transferred from the surface material non-woven fabric 16 to the core wrap mount 18. When the hydrophilic agent migrates and the surface material non-woven fabric 16 becomes water-repellent, the permeation and absorption of the body fluid into the absorber is hindered, the liquid diffuses widely on the surface material, and the body fluid adheres to the skin for a long time. The performance of the article 10A deteriorates. By incorporating the above-mentioned migration inhibitor in the surface material nonwoven fabric 16, it is possible to inhibit the migration of the hydrophilic agent and suppress the water repellency of the surface material nonwoven fabric.
次に、本発明の実施例について説明するが、これにより本発明が限定されるものではない。 Next, examples of the present invention will be described, but the present invention is not limited thereto.
基材不織布として、ＰＰ繊維を含む坪量１１ｇ／ｍ2のＳＭＳ不織布（１２ｃｍ×３５ｃｍ）を用意した。親水化剤は、下記の処方で、東邦化学工業株式会社製「フォスファノールＭＬ−２００」の水酸化カリウム中和物（ＰＯＥ（付加モル数３）ラウリルフォスフェートカリウム塩）、信越化学工業株式会社製「Ｘ−２２−４５１５」（ＰＯＥ，ＰＯＰ変性シリコーン）、川研ファインケミカル株式会社製「アミゾールＳＤＥ」（ＰＯＥ（付加モル数１）ステアリルアミド）、花王株式会社製「アンヒトール８６Ｂ」（ステアリルベタイン）、及び花王株式会社製「ペレックスＯＴ−Ｐ」（ジオクチルスルホコハク酸）を配合して調製した。 As the base non-woven fabric, an SMS non-woven fabric (12 cm × 35 cm) having a basis weight of 11 g / m 2 containing PP fibers was prepared. The hydrophilizing agent is a neutralized potassium hydroxide product of "Phosphanol ML-200" manufactured by Toho Chemical Industry Co., Ltd. (POE (additional number of moles: 3) lauryl phosphate potassium salt), Shin-Etsu Chemical Co., Ltd. Company-made "X-22-4515" (POE, POP-modified silicone), Kawaken Fine Chemicals Co., Ltd. "Amizole SDE" (POE (additional number of moles 1) stearylamide), Kao Corporation "Anchor 86B" (stearyl betaine) ) And "Perex OT-P" (dioctyl sulfosuccinic acid) manufactured by Kao Corporation.
下記表には、ここで用いる移行阻害剤をまとめる。 The table below summarizes the migration inhibitors used here.
移行阻害剤は、それぞれ水に分散させて２質量％の分散液とした後、親水化剤と混合して複数の塗布液を調製した。塗布液中における親水化剤及び移行阻害剤の濃度は、いずれも０．２質量％とした。基材不織布に対する親水化剤の不揮発分の割合は、０．８％であった。 Each of the migration inhibitors was dispersed in water to prepare a 2% by mass dispersion, and then mixed with a hydrophilic agent to prepare a plurality of coating solutions. The concentrations of the hydrophilic agent and the migration inhibitor in the coating liquid were both 0.2% by mass. The ratio of the non-volatile content of the hydrophilic agent to the base non-woven fabric was 0.8%.
基材不織布は、それぞれ塗布液に浸漬した後、所定の圧力で加圧された２本のゴムロール間を通して脱水を行った。その後、８０℃で５分間乾燥させることで、実施例１〜８の試料を作製した。さらに、親水化剤のみを用いて比較例１の試料を作製し、移行阻害剤のみを用いて比較例２の試料を作製した。
下記表には、実施例及び比較例の試料における親水化剤及び移行阻害剤の濃度をまとめる。なお、表中の数値は、基材不織布の質量に対する親水化剤の不揮発分の割合（ＯＰＵ：質量％）である。
Each of the base non-woven fabrics was immersed in the coating liquid and then dehydrated through between two rubber rolls pressurized at a predetermined pressure. Then, the sample of Examples 1 to 8 was prepared by drying at 80 degreeC for 5 minutes. Further, a sample of Comparative Example 1 was prepared using only a hydrophilic agent, and a sample of Comparative Example 2 was prepared using only a migration inhibitor.
The table below summarizes the concentrations of hydrophilic agents and migration inhibitors in the samples of Examples and Comparative Examples. The numerical value in the table is the ratio of the non-volatile content of the hydrophilic agent to the mass of the base non-woven fabric (OPU: mass%).
次に、本発明に係る積層体の長期保存後の親水性の低下抑制の効果を、親水化剤の残存率と液滴吸収率によって評価した。親水化剤の残存率及び液滴吸収率は、次の方法で測定した。すなわち、実施例及び比較例の試料を、吸収性物品の保存状態を模した条件で保存し、保存後の試料における親水化剤の残存率及び液滴吸収率を求めた。具体的には、各試料を吸収性物品のパルプ含有層を模したパルプシート（２００ｇ／ｍ２）で挟んで積層体とし、表面にアクリル板（２０ｃｍ×３５ｃｍ）を載置して、１ｋＰａの荷重を印加した。これは吸収性物品が商品として複数枚パッケージで封入されたときの不織布に掛かる内圧を模したものである。この状態で、４０℃、相対湿度８０％の環境で３０日間保存した。 Next, the effect of suppressing the decrease in hydrophilicity of the laminate according to the present invention after long-term storage was evaluated by the residual rate of the hydrophilic agent and the droplet absorption rate. The residual rate of the hydrophilic agent and the droplet absorption rate were measured by the following methods. That is, the samples of Examples and Comparative Examples were stored under conditions that imitated the storage state of the absorbent article, and the residual rate of the hydrophilic agent and the droplet absorption rate in the sample after storage were determined. Specifically, each sample is sandwiched between pulp sheets (200 g / m 2 ) imitating the pulp-containing layer of the absorbent article to form a laminated body, and an acrylic plate (20 cm × 35 cm) is placed on the surface to obtain 1 kPa. A load was applied. This imitates the internal pressure applied to the non-woven fabric when the absorbent article is enclosed in a plurality of packages as a commercial product. In this state, it was stored for 30 days in an environment of 40 ° C. and 80% relative humidity.
［親水化剤の残存率の測定］
親水化剤の残存率は、固体ＮＭＲ法により求めた。具体的には、ＯＰＵ測定装置ＭＱＣ（Ｏｘｆｏｒｄ Ｉｎｓｔｒｕｍｅｎｔ製）を用い、既知の親水化剤に対し検量線を作成した。上述の条件で保存した後のＯＰＵ値をＯＰＵ（１）とし、保存前のＯＰＵ値をＯＰＵ（０）として、下記数式（１）により残存率を求めた。保存前のＯＰＵ値は０．８質量％であった。
[Measurement of residual rate of hydrophilic agent]
The residual ratio of the hydrophilic agent was determined by the solid-state NMR method. Specifically, a calibration curve was prepared for a known hydrophilic agent using an OPU measuring device MQC (manufactured by Oxford Instruments). The residual rate was calculated by the following mathematical formula (1), where the OPU value after storage under the above conditions was OPU (1) and the OPU value before storage was OPU (0). The OPU value before storage was 0.8% by mass.
なお、親水化剤の残存率は、固体ＮＭＲ法の他、重量法により求めても良い。重量法とは、洗浄前後の不織布の質量差を基材不織布の質量で除した割合から、親水化剤のＯＰＵ値を求める方法である。親水化剤の洗浄に用いる溶剤としては、水やメタノール、エタノール、メチルエチルケトン等が挙げられる。具体的には、例えば不織布を６０℃の温水で１０分間浸漬し遠心脱水してこれを３回繰り返して乾燥し、洗浄前後の質量差から同様にＯＰＵ値を求める。水で脱落し難い親水化剤を含む場合は、水洗浄の後、さらにエタノールで１０分間浸漬し遠心脱水することを複数回繰り返してもよい。 The residual ratio of the hydrophilic agent may be determined by a gravimetric method in addition to the solid-state NMR method. The gravimetric method is a method for obtaining the OPU value of the hydrophilic agent from the ratio obtained by dividing the mass difference of the non-woven fabric before and after washing by the mass of the base non-woven fabric. Examples of the solvent used for cleaning the hydrophilic agent include water, methanol, ethanol, methyl ethyl ketone and the like. Specifically, for example, the non-woven fabric is immersed in warm water at 60 ° C. for 10 minutes, dehydrated by centrifugation, repeated three times to dry, and the OPU value is similarly obtained from the mass difference before and after washing. If a hydrophilic agent that is difficult to remove with water is contained, washing with water and then immersing in ethanol for 10 minutes and centrifugal dehydration may be repeated a plurality of times.
［液滴吸収率の測定］
液滴吸収率は、評価液として生理食塩水（５μＬ）を用いて液滴を形成し、以下の方法により求めた。まず、ガラス板の上に試料が平坦になるように均して置き、端をテープでガラス台に固定した。試料の上には、マイクロシリンジにより２０点の液滴を１ｃｍ以上の間隔で形成した。この際、マイクロシリンジの針先に形成した液滴を静かに近づけて不織布表面に載せた。６０秒経過後、試料に完全に吸収された液滴の数を目視で確認した。なお、液滴の形成及びそれ以降の操作は、室温２３℃、相対湿度５０％、無風の環境下で行った。
６０秒以内に試料に完全に吸収された液滴の数（Ｎ）を用いて、下記数式（２）により液滴吸収率を算出した。
[Measurement of droplet absorption rate]
The droplet absorption rate was determined by the following method after forming droplets using physiological saline (5 μL) as the evaluation solution. First, the sample was evenly placed on a glass plate so that it was flat, and the edges were fixed to the glass table with tape. On the sample, 20 droplets were formed at intervals of 1 cm or more by a microsyringe. At this time, the droplets formed on the needle tip of the microsyringe were gently brought close to each other and placed on the surface of the non-woven fabric. After 60 seconds, the number of droplets completely absorbed by the sample was visually confirmed. The formation of the droplets and the subsequent operations were performed in an environment of room temperature of 23 ° C., relative humidity of 50%, and no wind.
Using the number of droplets (N) completely absorbed by the sample within 60 seconds, the droplet absorption rate was calculated by the following mathematical formula (2).
得られた結果を、保存前の液滴吸収率とともに下記表にまとめる。
移行阻害剤を含有しない場合（比較例１）と異なり、実施例では、長期保存によって不織布から親水化剤の移行が抑制され、親水性が保たれていた。移行阻害剤としてシリカを用いた場合（実施例１〜３）には、保存後の残存率が３２％以上であり、保存後の液滴吸収率も６６％以上と高い効果が得られている。実施例４及び実施例５は、移行阻害剤としていずれも炭酸カルシウムを用いたものである。ＢＥＴ比表面積が２０ｍ2／ｇ以上の炭酸カルシウムを用いることによって残存率及び保存後の液滴吸収率が高められることが、これらの比較からわかる。
移行阻害剤のＢＥＴ比表面積が大きいほど、残存率及び保存後の液滴吸収率がより大きくなる傾向にあることも示されている。
Unlike the case where the transfer inhibitor was not contained (Comparative Example 1), in the example, the transfer of the hydrophilic agent from the non-woven fabric was suppressed by long-term storage, and the hydrophilicity was maintained. When silica is used as the migration inhibitor (Examples 1 to 3), the residual rate after storage is 32% or more, and the droplet absorption rate after storage is 66% or more, which is a high effect. .. In Examples 4 and 5, calcium carbonate was used as a migration inhibitor. From these comparisons, it can be seen that the residual rate and the droplet absorption rate after storage are enhanced by using calcium carbonate having a BET specific surface area of 20 m 2 / g or more.
It has also been shown that the higher the BET specific surface area of the migration inhibitor, the higher the residual rate and the droplet absorption rate after storage.
１０，１０Ａ…吸収性物品 １２…吸収性コア １４…コアラップ不織布
１６…表面材不織布 １８…コアラップ台紙 ２０…積層体 ２２…パルプ
２４…ＳＡＰ ３２…合成繊維 ３６…移行阻害剤
10, 10A ... Absorbent article 12 ... Absorbent core 14 ... Core wrap non-woven fabric 16 ... Surface material non-woven fabric 18 ... Core wrap mount 20 ... Laminated body 22 ... Pulp 24 ... SAP 32 ... Synthetic fiber 36 ... Transition inhibitor
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56133028A (en) * | 1980-03-25 | 1981-10-17 | Nippon Shokubai Kagaku Kogyo Co Ltd | Composition of water absorbent |
| JP2002543924A (en) * | 1999-05-14 | 2002-12-24 | ザ、プロクター、エンド、ギャンブル、カンパニー | Disposable absorbent article with hydrophobic topsheet and improved liquid handling performance |
| JP2007538166A (en) * | 2004-05-19 | 2007-12-27 | ビーエーエスエフ アクチェンゲゼルシャフト | Structured surface manufacturing method |
| JP2011522672A (en) * | 2008-06-13 | 2011-08-04 | ザ プロクター アンド ギャンブル カンパニー | An absorbent article comprising an absorbent polymer material, a wetness indicator, and a surfactant with reduced mobility |
| JP2016067897A (en) * | 2014-09-30 | 2016-05-09 | 花王株式会社 | Absorbent article |
| JP2017063945A (en) * | 2015-09-29 | 2017-04-06 | 住友大阪セメント株式会社 | Deodorant, sanitation good, and cloth with deodorant function |
| JP2018504507A (en) * | 2014-11-14 | 2018-02-15 | アテンズ ヘルスケア プロダクツ インコーポレイテッド | Synthetic surfactant-free finishing agents, sheets with synthetic surfactant-free finishing agents, articles having sheets with synthetic surfactant-free finishing agents, and related methods |
| WO2018054766A1 (en) * | 2016-09-22 | 2018-03-29 | Essity Hygiene And Health Aktiebolag | Absorbent article with ph controlled topsheet |
-
2019
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56133028A (en) * | 1980-03-25 | 1981-10-17 | Nippon Shokubai Kagaku Kogyo Co Ltd | Composition of water absorbent |
| JP2002543924A (en) * | 1999-05-14 | 2002-12-24 | ザ、プロクター、エンド、ギャンブル、カンパニー | Disposable absorbent article with hydrophobic topsheet and improved liquid handling performance |
| JP2007538166A (en) * | 2004-05-19 | 2007-12-27 | ビーエーエスエフ アクチェンゲゼルシャフト | Structured surface manufacturing method |
| JP2011522672A (en) * | 2008-06-13 | 2011-08-04 | ザ プロクター アンド ギャンブル カンパニー | An absorbent article comprising an absorbent polymer material, a wetness indicator, and a surfactant with reduced mobility |
| JP2016067897A (en) * | 2014-09-30 | 2016-05-09 | 花王株式会社 | Absorbent article |
| JP2018504507A (en) * | 2014-11-14 | 2018-02-15 | アテンズ ヘルスケア プロダクツ インコーポレイテッド | Synthetic surfactant-free finishing agents, sheets with synthetic surfactant-free finishing agents, articles having sheets with synthetic surfactant-free finishing agents, and related methods |
| JP2017063945A (en) * | 2015-09-29 | 2017-04-06 | 住友大阪セメント株式会社 | Deodorant, sanitation good, and cloth with deodorant function |
| WO2018054766A1 (en) * | 2016-09-22 | 2018-03-29 | Essity Hygiene And Health Aktiebolag | Absorbent article with ph controlled topsheet |
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