JP2016120083A - Absorber and sanitary product comprising absorber - Google Patents
Absorber and sanitary product comprising absorber Download PDFInfo
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
- A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/531—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
- A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
- A61L15/42—Use of materials characterised by their function or physical properties
- A61L15/60—Liquid-swellable gel-forming materials, e.g. super-absorbents
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/32—Polymerisation in water-in-oil emulsions
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/02—Homopolymers or copolymers of acids; Metal or ammonium salts thereof
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/531—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad
- A61F2013/5315—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad with a tissue-wrapped core
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/54—Improvements relating to the production of bulk chemicals using solvents, e.g. supercritical solvents or ionic liquids
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Abstract
Description
本発明は、吸収体と、この吸収体を備える衛生用品に関する。 The present invention relates to an absorbent body and a sanitary product including the absorbent body.
近年、使い捨ておむつ、生理用ナプキン等の衛生用品に用いられる吸収体では、パルプ等の吸水性繊維と高吸収性ポリマー(以下、SAPと呼ぶ)が混合あるいは積層されて使用されているが、吸収体の薄型化、更には超薄型化が進むにつれて、SAPの量が50質量%以上を占めるようになっている。このため、SAPは本来の液体貯蔵機能だけでなく、パルプ等の吸水繊維が担っていた液輸送機能も担わなければ、吸収体の薄型化によって吸収性能、特に繰返し吸収性能が低下することになる。繰返し吸収性能を長時間に亘って維持する為には、尿を吸収して吸水繊維が湿潤し、SAPが膨潤してヒドロゲル化した状態でも、排泄された尿を継続して吸収体内に取り込み、吸収余力のある部分に液輸送して、最終的にはSAPに保持する必要がある。しかしながらSAPの吸水性能、特に基本性能と位置づけられる、保水倍率と吸収速度、通液性はトレードオフする関係にあり全てを向上させることは難しい。そこで、SAPの吸水性能を更に向上させるためには、使い捨ておむつ内で実際に吸収する局面を絞り込み、トレードオフする吸収性能を最適な状態でバランスさせ、狙った吸収局面において最も効果的効率的に吸収性能を発揮させる必要がある。例えば、特許文献1には、遠心保持容量(CRC)が少なくとも26g/gであり、輸送値(TW)が少なくとも15000cm3sであるSAPが開示されている。輸送値(TW)は液体拡散性能(SFC)および60分後の芯吸収量(DA60)からの積を107で乗じたものである。 In recent years, absorbents used in sanitary products such as disposable diapers and sanitary napkins have been used by mixing or laminating water-absorbing fibers such as pulp and superabsorbent polymers (hereinafter referred to as SAP). As the body becomes thinner and further ultrathin, the amount of SAP occupies 50% by mass or more. For this reason, if SAP does not have not only the original liquid storage function but also the liquid transport function that water absorption fibers such as pulp do, it will reduce the absorption performance, especially the repeated absorption performance due to the thinning of the absorber. . In order to maintain repeated absorption performance over a long period of time, even when urine is absorbed, the water-absorbing fibers are moistened, and SAP swells and hydrogels, the excreted urine is continuously taken into the absorbent body, It is necessary to transport the liquid to a portion having an absorption capacity and finally hold it in the SAP. However, it is difficult to improve all of the water absorption performance of SAP, particularly the basic performance, which is a trade-off relationship between water retention magnification, absorption speed, and liquid permeability. Therefore, in order to further improve the water absorption performance of the SAP, the aspect of actual absorption in the disposable diaper is narrowed down, the absorption performance to be traded off is balanced in an optimal state, and the most effective and efficient in the targeted absorption aspect. It is necessary to demonstrate absorption performance. For example, Patent Document 1 discloses an SAP having a centrifugal retention capacity (CRC) of at least 26 g / g and a transport value (TW) of at least 15000 cm 3 s. The transport value (TW) is the product of the liquid diffusion performance (SFC) and the core absorption after 60 minutes (DA 60 ) multiplied by 10 7 .
特許文献1に開示された発明によれば、液体拡散性能(SFC:Saline Flow Conductivity)は、60分間膨潤させたヒドロゲル層に、0.3psi(2.07kPa)の圧力負荷下で液透過量として測定される。SFCは、排尿口付近に稠密状態でおかれた最大限に膨潤したヒドロゲル間の液透過性能を示すといえるが、実際に使用されている紙おむつ吸収体では、繰返し排泄される尿は、100%近く吸収して膨潤したヒドロゲル層を通過して拡散するよりも、膨潤して吸収能力が低下したヒドロゲル層の、上下や側面を廻りこむように流れて、吸収余力の残った領域で吸収されている。このような尿の流れを獲得保持する為に、SAPが存在する液保持層とは別に、液獲得拡散層(ADL層)が併用され、液獲得と液保持を分業する吸収体構成が主流となっている。また、特許文献1によれば、芯吸収量(DA60)は、吸水性ポリマー粒子70gを3cmの厚みで充填し、60分間に亘って管から流出される塩溶液の吸収量を測定される。芯吸収量(DA60)は、充分なヒドロゲル量を充分な吸収時間で測定され、ヒドロゲルの吸収量のポテンシャルを評価する方法としては優れているが3cmの厚みで測定される拡散保持力は、上記SFCと同様に、稠密状態に置かれたヒドロゲルの吸収性能であり、液獲得拡散層(ADL層)が併用され、液獲得と液保持を分業する吸収体構成を前提とした性能評価といえる。 According to the invention disclosed in Patent Document 1, the liquid diffusion performance (SFC) is measured as a liquid permeation amount under a pressure load of 0.3 psi (2.07 kPa) on a hydrogel layer swollen for 60 minutes. Measured. It can be said that SFC shows the liquid permeation performance between the swelled hydrogels in a dense state in the vicinity of the urination opening, but in the actually used paper diaper absorber, 100% of the urine excreted repeatedly is 100%. Rather than passing through a hydrogel layer that has absorbed and swollen nearby and diffusing, the hydrogel layer that has swollen and has reduced absorption capacity flows around the top and bottom and side surfaces and is absorbed in the region where the remaining absorption capacity remains. . In order to acquire and retain such a flow of urine, a liquid acquisition diffusion layer (ADL layer) is used in combination with a liquid retention layer in which SAP is present, and an absorber structure that separates liquid acquisition and liquid retention is the mainstream. It has become. According to Patent Document 1, the core absorption amount (DA60) is measured by measuring the absorption amount of a salt solution that is filled with 70 g of water-absorbing polymer particles with a thickness of 3 cm and flows out of the tube over 60 minutes. The core absorption amount (DA60) is measured as a sufficient amount of hydrogel in a sufficient absorption time, and is an excellent method for evaluating the potential of the absorption amount of the hydrogel, but the diffusion holding force measured at a thickness of 3 cm is as described above. Similar to SFC, it is the absorption performance of a hydrogel placed in a dense state, and can be said to be a performance evaluation based on the premise of an absorber configuration in which a liquid acquisition diffusion layer (ADL layer) is used in combination to separate liquid acquisition and liquid retention.
しかし、特許文献1のような、SAPが稠密に配置され高密度な液保持層と、効果的に液を一時保持する嵩高な液獲得拡散層(ADL層)が併用される吸収体では、SAPはヒドロゲルの透過性を向上させる為に、保水倍率を低下させて低保水高通液化したものを高目付で使用することとなり、嵩高なADL層併用とも相まって、吸収体の薄型効果が相殺されてしまい、薄型化が進まないという問題がある。 However, as in Patent Document 1, in an absorber in which SAP is densely arranged and a high-density liquid holding layer and a bulky liquid acquisition diffusion layer (ADL layer) that effectively temporarily holds the liquid are used in combination, In order to improve the permeability of the hydrogel, the water retention ratio is lowered to reduce the water retention and high fluidity, so that it is used with a high basis weight, and combined with the bulky ADL layer, the thinning effect of the absorber is offset Therefore, there is a problem that thinning does not progress.
以上に鑑み、本発明は、衛生用品の吸収体を改良して、薄型化が可能な吸収体を提供することを課題とする。 In view of the above, an object of the present invention is to provide an absorbent body that can be thinned by improving the absorbent body of a sanitary product.
例えば紙おむつに用いられる吸収体の場合、赤ちゃんの体圧が掛かっていない領域では、体圧が掛かった領域に対して、相対的に多くの尿が吸収体の内外に一時貯留される。一時貯留される尿は、吸水性素材との結びつきの程度に応じて、(a)吸収体外(表面材上)に滞留する「吸収体外滞留尿」、(b)吸収体中に排泄された勢いや水圧で浸透したが保持されていない「吸収体内滞留尿」、(c)親水性繊維やSAPに保持された「吸収体内保持尿」の3段階の尿が、連続的に存在している。排泄1〜2回では、パルプやSAPの吸収余力が大きい為、「吸収体外滞留尿」と「吸収体内滞留尿」は少ないが、何度も繰り返して吸収すると、吸収速度の低下により、「吸収体外滞留尿」と「吸収体内滞留尿」、特に「吸収体外滞留尿」が増加して、姿勢変化や吸収体の変形によって、紙おむつ外部に漏れる危険性が高くなる。漏れにつながるリスクを小さくする為には、「吸収体外滞留尿」を最小化する必要があり、そのためには、「吸収体外滞留尿」をできるだけ「吸収体内滞留尿」の状態に移行させる必要がある。「吸収体内滞留尿」は、吸収体内の吸水素材間に形成される空間に一時的に保持される尿であり、従来は、ADL層として吸収体と表面材の間に嵩高な素材を配置して「吸収体内滞留尿」を蓄える空間を形成していたが、吸収体が厚くなるという問題があった。そこで、SAPの吸水膨潤する力、膨潤粒子径(A)と膨潤速度(B)と膨潤させる効率(C)を最適化することで、「吸収体内滞留尿」の貯留空間をSAPの膨潤を利用して薄型吸収体内の膨潤したSAPの周囲に効果的に発生させることができ、繰返し吸収力を最大化できることを見出した。 For example, in the case of an absorber used for a paper diaper, in a region where the baby's body pressure is not applied, a relatively large amount of urine is temporarily stored inside and outside the absorber compared to the region where the body pressure is applied. The temporarily stored urine is (a) “absorbed urine outside the absorber” that stays outside the absorber (on the surface material), and (b) momentum excreted in the absorber, depending on the degree of binding with the water-absorbing material. There are continuously three stages of urine: “residual urine in the absorbent body” that has been permeated by water pressure but is not retained, and (c) “urine retained in the absorbent body” retained in hydrophilic fibers and SAP. In the excretion 1 to 2 times, there is little “residual urine outside the absorber” and “residual urine in the absorber” due to the large absorption capacity of pulp and SAP. “Externally retained urine” and “absorbed body urine”, particularly “externally absorbed urine” increase, and the risk of leakage outside the disposable diaper increases due to posture change and absorber deformation. In order to reduce the risk of leaking, it is necessary to minimize “residual urine outside the absorber”. To that end, it is necessary to move “residual urine outside the absorber” to the “residual urine within the absorber” as much as possible. is there. “Residual urine in the absorber” is urine temporarily held in a space formed between the water-absorbing materials in the absorber, and conventionally, a bulky material is disposed between the absorber and the surface material as an ADL layer. However, there is a problem that the absorber becomes thick. Therefore, by optimizing the ability of SAP to absorb water and swell, swollen particle diameter (A), swelling speed (B), and efficiency of swelling (C), the storage space of “residual urine in the absorbent” can be used to swell SAP. It was found that it can be effectively generated around the swollen SAP in the thin absorbent body, and the absorption capacity can be maximized repeatedly.
詳しくは、膨潤粒子径(A)は保水倍率と正の相関関係にある。SAPが内部に取り込んだ尿によってSAP粒子が膨潤し、ヒドロゲル粒子径を拡大するからである。保水倍率は遠心保持容量(CRC)として測定される。また膨潤速度(B)は、SAPの吸水速度、Demand Wettability(DW)として測定される。DW値は荷重をかけずに生理食塩水を吸引して吸収する速度として測定され、時間当たりに吸収した生理食塩水量を、重量または容量で数値化される。DW値は一般に2分値、5分値、15分値が代表値として示されるが、更にSAPが飽和した状態に近い60分値としても測定され、吸収速度と正の相関関係にある。DW5分値も繰返し吸収性能に高い相関を有するが、更に高い相関を有するのは、ある程度ヒドロゲル化した状態での吸水速度、後期吸水速度である。吸収後期に高い吸水速度を有することで、「吸収体内滞留尿」をSAPヒドロゲル内にすばやく取り込み「吸収体内保持尿」に転換、「吸収体外滞留尿」の吸収体内へ取り込み余力を同時並行して形成し、「吸収体外滞留尿」を迅速に低減させることができる。吸収体が繰返し吸収した後ほど、パルプ等の吸水繊維の吸収能力は殆ど残っていないので、SAPヒドロゲルの後期吸収速度は重要になる。SAPヒドロゲルの後期吸収速度は、SAP粒子の吸収量が40ml/gから50ml/gに到達する時間から算出される。膨潤させる効率(C)は、通液性として測定できる。通液性としてはSAPが吸水膨潤し飽和状態に達したヒドロゲルを無加圧状態で測定される場合と、加圧された状態で測定される塩水流れ誘導性(Saline Flow Conductibity;SFC)が知られているが、「吸収体内滞留尿」を継続的に液輸送し「吸収体内保持尿」とする為には、微加圧状態で吸水したヒドロゲルで測定される微加圧SFCと相関関係にあることを発見した。SAPヒドロゲルが完全に飽和した状態でのSAPヒドロゲル間の液輸送は実際の吸収体内では殆ど起こりえない。また大きな体圧がかかった加圧状態でのSAPヒドロゲル間の液輸送は過酷すぎるが故に、実際のおむつの吸収体全体での寄与率は大きくない。最も吸収体の吸収に寄与するのは赤ちゃんの体圧に相当する加圧下で最大限膨潤したSAPヒドロゲルが除圧され微加圧状態に置かれた状態での液輸送、すなわち微加圧時の通液性(微加圧SFC)である。以上のように、吸収体が継続的に安定して繰返し吸収するには、SAPの保水倍率、吸収速度(DW5分値、後期吸収速度)、通液性(微加圧SFC)が重要である。但しこれらは、互いにトレードオフの関係にあり、保水倍率×後期吸収速度×微加圧下吸収性×103で求められる「繰返し吸収力指数」を2以上とすることで、「吸収体内滞留尿」貯留空間の形成速度を最大化するとともに、ひいては薄型吸収体の繰返し吸収性能を最大化できることを見出し、本発明に至った。 Specifically, the swollen particle diameter (A) is positively correlated with the water retention magnification. This is because SAP particles are swollen by the urine taken in by the SAP and the hydrogel particle diameter is enlarged. The water retention ratio is measured as a centrifugal retention capacity (CRC). The swelling rate (B) is measured as the water absorption rate of SAP, Demand Wetability (DW). The DW value is measured as the rate at which physiological saline is sucked and absorbed without applying a load, and the amount of physiological saline absorbed per hour is expressed in terms of weight or volume. The DW value is generally represented by a 2-minute value, a 5-minute value, or a 15-minute value as a representative value, but is further measured as a 60-minute value close to a state where the SAP is saturated, and has a positive correlation with the absorption rate. The DW5 value also has a high correlation with the repetitive absorption performance, but the higher correlation is the water absorption rate in the state of hydrogelation to some extent and the late water absorption rate. By having a high water absorption rate in the late stage of absorption, “residual urine in the absorber” is quickly taken into the SAP hydrogel and converted into “retained urine in the absorber”, and the remaining capacity of “externally retained urine” is taken into the absorber in parallel. It is possible to quickly reduce “residual urine outside the absorber”. The later absorption rate of the SAP hydrogel becomes important since the absorption capacity of water-absorbing fibers such as pulp remains little after the absorber has repeatedly absorbed. The late absorption rate of the SAP hydrogel is calculated from the time when the amount of SAP particles absorbed reaches 40 ml / g to 50 ml / g. The efficiency (C) for swelling can be measured as liquid permeability. As the liquid permeability, there are known cases where a hydrogel in which SAP has absorbed and swelled and has reached a saturated state is measured in a non-pressurized state, and a saline flow conductivity (SFC) measured in a pressurized state. However, in order to continuously transport “residual urine in the absorbent” to “retained urine in the absorbent”, there is a correlation with the slightly pressurized SFC measured by the hydrogel absorbed in the slightly pressurized state. I discovered that there is. Liquid transport between SAP hydrogels when the SAP hydrogel is fully saturated is unlikely to occur in the actual absorbent body. Moreover, since the liquid transport between the SAP hydrogels in a pressurized state under a large body pressure is too severe, the contribution ratio of the actual absorbent body of the diaper is not large. The absorption of the absorber most contributes to the liquid transport in a state where the SAP hydrogel swollen to the maximum under pressure corresponding to the body pressure of the baby is decompressed and placed in a slightly pressurized state, that is, at the time of slightly pressurized Liquid permeability (slightly pressurized SFC). As described above, in order for the absorber to continuously and stably absorb repeatedly, the water retention ratio of SAP, the absorption rate (DW 5-minute value, late absorption rate), and liquid permeability (slightly pressurized SFC) are important. . However, these are in a trade-off relationship with each other, and by setting the “repetitive absorbency index” obtained by water retention magnification × late stage absorption rate × absorbability under slight pressure × 10 3 to 2 or more, “residual urine in the absorber” It has been found that the formation speed of the storage space can be maximized and the repeated absorption performance of the thin absorbent body can be maximized.
上記課題を解決した本発明は、高吸水性ポリマー粒子と、吸水性繊維とを含む吸収コアと、吸収コアを包被するシート部材とを備える吸収体であって、高吸水性ポリマー粒子の保水倍率が37g/g以上、高吸水性ポリマー粒子を生理食塩水に無荷重で5分間接触させ吸引させたときの吸収量であるDW5分値が40ml/g以上、高吸水性ポリマー粒子のDW値が40ml/gから50ml/gに到達する時間から算出される後期吸収速度が6ml/g・分以上、微加圧下の液体拡散性能である微加圧SFCが5×10−6・ml・秒以上、保水倍率×後期吸収速度×微加圧SFC×103で定義される繰返し吸収力指数が2以上であることを特徴とする。 The present invention that has solved the above problems is an absorbent body comprising a highly water-absorbing polymer particle, an absorbent core containing a water-absorbing fiber, and a sheet member that encloses the absorbent core. Magnification is 37 g / g or more, DW5 minute value is 40 ml / g or more when the superabsorbent polymer particles are aspirated by contact with physiological saline for 5 minutes with no load, DW value of superabsorbent polymer particles The late absorption rate calculated from the time it takes to reach 50 ml / g from 40 ml / g is 6 ml / g · min or more, and the slightly pressurized SFC that is the liquid diffusion performance under slightly pressurized is 5 × 10 −6 · ml · second. As described above, the repetitive absorbency index defined by water retention magnification × late-term absorption rate × slightly pressurized SFC × 10 3 is 2 or more.
本発明により、特定の吸収挙動を示すSAPと吸水性繊維とが組み合わされ、薄型化が可能で、繰返し吸収性能の優れた吸収体と、この吸収体を備える衛生用品が提供される。 According to the present invention, an SAP that exhibits a specific absorption behavior and a water-absorbing fiber are combined, and an absorbent body that can be thinned and has excellent repeated absorption performance, and a sanitary article including the absorbent body are provided.
図面は、本発明の特定の実施の形態を示し、発明の不可欠な構成ばかりでなく、選択的及び好ましい実施の形態を含む。
下記の実施の形態は、本発明の吸収体に関し、発明の不可欠な構成ばかりではなく、選択的及び好ましい構成を含む。 The following embodiments relate to the absorbent body of the present invention, and include not only an indispensable structure of the invention but also a selective and preferable structure.
図1を参照して、吸収体1はSAP(高吸水性ポリマー)粒子2と、吸水性繊維3とを含む吸収コア4と、吸収コア4を包被するシート部材5とを備える。吸収体1に含まれるSAP粒子2は50〜100質量%であり、吸水性繊維3は0〜50質量%であることが好ましい。吸水性繊維3には、セルロース系繊維、好ましくはパルプを用いることができる。SAP粒子2は架橋ポリアクリル酸ナトリウム塩の粒子であるが、本発明に係るSAP粒子2の詳細は後述する。吸収コア4を包被するシート部材5には透液性のシートが用いられ、任意に透液性のシートに不透液性のシートを組み合わせることができる。すなわち、吸収コア4全体を透液性のシート単独で包被することができる。また、透液性のシートと、不透液性のシートとの間に吸収コア4を保持することもできる。この場合、透液性のシートを吸収体の使用者の肌に対向する肌対向面側に配置し、不透液性のシートを肌対向面に対向する非肌対向面側に配置する。水透過性のシートの例として不織布、ティシュペーパ、多数の微小開孔を有するフィルムが挙げられるが、これらに限定されない。不透液性のシートの例として樹脂フィルム、撥水化処理した不織布が挙げられるが、これらに限定されない。
With reference to FIG. 1, the absorbent body 1 includes an absorbent core 4 including SAP (highly water-absorbing polymer)
本発明の吸収体1に用いるSAP粒子2は、次のいずれか又は全ての条件を満たす。
(1)SAP粒子2の保水倍率が37g/g以上、好ましくは39g/g以上である。
(2)SAP粒子2のDW5分値が40ml/g以上、好ましくは50ml/g以上であり、より好ましくは60ml/gより大きい。
(3)SAP粒子2のDW法での吸収量が40ml/gから50ml/gに到達する時間から算出される後期吸収速度が6ml/g・分、好ましくは7ml/g・分以上、好ましくは10ml/g・分以上、好ましくは14ml/g・分以上である。
(4)微加圧下の液体拡散性能である微加圧SFCが5×10−6・ml・秒以上、好ましくは7×10−6・ml・秒以上である。
The
(1) The water retention ratio of the
(2) The DW5 value of
(3) The late absorption rate calculated from the time when the amount of absorption of the
(4) The fine pressure SFC, which is the liquid diffusion performance under slight pressure, is 5 × 10 −6 · ml · second or more, preferably 7 × 10 −6 · ml · second or more.
SAP粒子2中の粒子径が300μm未満の粒子の量は10質量%以下であることが好ましく、より好ましくは9質量%以下、より好ましくは8質量%以下、より好ましくは7質量%以下、より好ましくは6質量%以下である。また、吸収コア4中のSAP粒子2の量は50〜100質量%であり、好ましくは50〜90質量%、より好ましくは50〜80質量%、より好ましくは50〜70質量%、より好ましくは50〜65質量%である。このとき、吸収コア4中のSAP粒子2以外の成分は吸水性繊維である。SAP粒子2の粒径の上限に制限はないが、好ましくは1000μm以下、より好ましくは900μm以下、より好ましくは800μm以下である。
The amount of particles having a particle size of less than 300 μm in the
本発明で用いるSAP粒子2は、上記条件を満たすものであれば特に限定されず、例えば以下の二つの方法で得たSAP粒子2のいずれか一方または両方を用いることができる。
The
第1の方法では、上記条件を満たすために、アクリル酸ポリマーの重合架橋反応において、ラジカル重合開始剤として自己架橋反応の少ないアゾ系ラジカル重合開始剤を用い、重合反応の際に、連鎖移動開始剤を添加して反応させることによって、本発明で用いるSAP粒子2を得ることができる。具体的には特許第5162634号に記載された重合方法を用いることができる。また、精密な重合反応制御と広範な粒子径の制御が可能な点から逆相懸濁重合法が望ましく、例えば、特許第4969778号に記載された重合法を用いることができる。本発明では、内部架橋剤として多価グリシジル化合物の存在下、水溶性アゾ系ラジカル重合開始剤を用いて2〜3段の逆相懸濁重合を行った後、得られた吸水性樹脂を後架橋剤で後架橋して得た、内部に比べて表面近傍部分の架橋密度が高いSAP粒子2を用いている。得られたSAP粒子2は、高い保水能、荷重下での高い吸収能、優れた吸収速度を持ち、かつ低水可溶分である。
In the first method, in order to satisfy the above conditions, an azo radical polymerization initiator having a small self-crosslinking reaction is used as the radical polymerization initiator in the polymerization crosslinking reaction of the acrylic acid polymer, and chain transfer is initiated during the polymerization reaction. The
第2の方法では、上記の「繰返し吸収力指数」=保水倍率×後期吸収速度×微加圧下SFC×103の関係式を演繹的に捉え、無加圧DWの高い吸水ポリマー(比較例5参照)中の粒径の小さい部分をカットすることで、本発明で用いるSAP粒子2(実施例2、3参照)を得ることができる。粒径の小さい部分は、吸収速度には貢献する一方、通液性は低下してしまい、繰返し吸収力指数は高くならない。そこで、SAP粒子2に含まれる粒径300μm未満の粒子を少なくすることで、無加圧DWを低下させることなく、通液性を高め、「後期吸収速度」及び「繰返し吸収力指数」を向上させることが可能である。また、小粒径部分をカットすることで、吸水ポリマーの内部架橋比率も高くなるので、保水倍率を向上させることができる。
In the second method, the relational expression “Repeated Absorption Index” = Water Retention Ratio × Late Absorption Rate × SFC × 10 3 under Slight Pressurization is deductively captured, and a water-absorbing polymer having a high pressureless DW (Comparative Example 5). The
<保水倍率の測定>
保水倍率は、SAPの粒子1グラムをティーバッグに秤取し、25℃の生理食塩水中に1時間浸漬して、吸収量を測定した後、450Gで遠心脱水して保水倍率を求めた。なお、特に断りの無い限り、本願での測定は全て20℃、65%RHの恒温恒湿室内で行っている。
<Measurement of water retention magnification>
For the water retention ratio, 1 gram of SAP particles was weighed in a tea bag, immersed in physiological saline at 25 ° C. for 1 hour, and the amount of absorption was measured. Unless otherwise specified, all measurements in this application are performed in a constant temperature and humidity room at 20 ° C. and 65% RH.
<DW5分値の測定>
SAPの粒子1.000gを秤取し、DW測定装置にセットした250メッシュのナイロンメッシュにできるだけ均一に散布、生理食塩水の吸収量を読み取った。初期吸収量として、5分間で吸収した量(ml/g)を読み取り、DW5分値とした。測定に使用したDW測定装置は、Scientific Machine & Supplies Co. LTD 製のDemand Wettability Testerであり、250メッシュのナイロンメッシュは、NBC工業製、N-NO.250HDであった。
<DW5 minute value measurement>
1.000 g of SAP particles were weighed and dispersed as evenly as possible on a 250 mesh nylon mesh set in a DW measuring device, and the amount of physiological saline absorbed was read. As the initial absorption amount, the amount absorbed in 5 minutes (ml / g) was read and used as the DW 5-minute value. The DW measuring apparatus used for the measurement was Demand Wettability Tester manufactured by Scientific Machine & Supplies Co. LTD, and the 250 mesh nylon mesh was N-NO.250HD manufactured by NBC Industries.
<後期吸収速度>
吸収時間と吸収量の関係をグラフ化し、SAPの粒子1.000gが生理食塩水40mlを吸収するに要した時間T40(分)と、50mlを吸収するに要した時間T50(分)を読み取り、T50−T40=ΔTを求め、10/ΔT(ml/g・分)を、後期吸収速度と定義した。
<Late absorption rate>
The relationship between the absorption time and the absorption amount is graphed, and the time T 40 (min) required for 1.000 g of SAP particles to absorb 40 ml of physiological saline and the time T 50 (min) required to absorb 50 ml of saline are shown. Reading T 50 -T 40 = ΔT, 10 / ΔT (ml / g · min) was defined as the late absorption rate.
<微加圧SFC>
通液性については、SFCが良く知られているが、荷重下で測定され、低保水倍率になり易い。一方、最大膨潤倍率で測定する無加圧状態での通液性も知られているが、吸収体内では、最大膨潤倍率に達することが無いので、吸収体性能との相関が低い。そこで、微加圧下通液性評価方法を考案して、評価指標とした。微加圧SFCの評価は以下の手順で行った。
SAPの粒子0.200gを秤取し、250メッシュのナイロンメッシュを底面に貼った内径26mmのシリンダーのメッシュ上に均一に散布した。次に、底面に250メッシュのナイロンメッシュを貼った外径25mmのピストン(質量30g)をシリンダーに挿入した。その後、生理食塩水を貯めたシャーレにセットした高さ2mmのスペーサ上に、ピストンが挿入されたシリンダーの底面を置き、30分間吸水させた。次に、シリンダーを生理食塩水から取り出し、ピストン上に200gの錘を乗せて3分間静置した。その後、錘とピストンをシリンダーから取り外し、シリンダー内を生理食塩水で満たし、1分間に透過した液量を秤量して微荷重下の通液速度Fとした。微加圧SFCは下式から求めた。なお、Gel層の厚さL0は、膨潤後のSAPの厚さを定規で測定して求めた。
For liquid permeability, SFC is well known, but it is measured under load and tends to have a low water retention ratio. On the other hand, liquid permeability in a non-pressurized state measured at the maximum swelling magnification is also known, but since the maximum swelling magnification is not reached in the absorbent body, the correlation with the absorbent performance is low. Therefore, a method for evaluating liquid permeability under slight pressure was devised and used as an evaluation index. The evaluation of the slightly pressurized SFC was performed according to the following procedure.
SAP particles (0.200 g) were weighed out and uniformly dispersed on a mesh of a cylinder having an inner diameter of 26 mm and a 250 mesh nylon mesh stuck on the bottom surface. Next, a piston (mass 30 g) having an outer diameter of 25 mm with a 250 mesh nylon mesh pasted on the bottom surface was inserted into the cylinder. Thereafter, the bottom surface of the cylinder into which the piston was inserted was placed on a spacer having a height of 2 mm set in a petri dish storing physiological saline, and water was absorbed for 30 minutes. Next, the cylinder was removed from the physiological saline, and a 200 g weight was placed on the piston and allowed to stand for 3 minutes. Thereafter, the weight and the piston were removed from the cylinder, the inside of the cylinder was filled with physiological saline, and the amount of liquid permeated for 1 minute was weighed to obtain a liquid passing speed F under a slight load. The slightly pressurized SFC was obtained from the following formula. The thickness L 0 of the Gel layer was determined by measuring the SAP thickness after swelling with a ruler.
<SAPの粒子径の評価>
JIS Z 8801に規定する篩を用いてSAPの粒子を篩い分け、それぞれの篩上に残った試料の質量を計測することにより、SAPの粒子径を評価した。使用した篩の目開きは850μm,710μm,600μm,500μm,355μm,300μm,250μm,及び150μmであった。
<Evaluation of SAP particle size>
SAP particles were evaluated by sieving SAP particles using a sieve specified in JIS Z 8801 and measuring the mass of the sample remaining on each sieve. The sieve openings used were 850 μm, 710 μm, 600 μm, 500 μm, 355 μm, 300 μm, 250 μm, and 150 μm.
<測定に用いた吸収体1と簡易おむつの作成方法>
(1)5cm幅にスリットしたパルプ(Weyerhaueser社、NB416)をパルプ粉砕機(Kamas Cell-mill)に供給して粉砕した。次に、サクションボックス上に貼った金網にPP繊維から成るSMS不織布を敷き、その上に木枠を置いて、所定の目付になるように粉砕したパルプを所定時間T送り込んだ。
(2)パルプ粉砕機とサクションボックスとの間にSAPの粒子を供給するスクリューフィーダーの散布管を挿入し、積層時に所定の目付になるように、回転数と供給時間を設定した。SAPは、パルプ供給後、1/4×T秒後に供給し、SAPを含まないパルプスキン層を形成させた。その後、1/2×T秒間、SAPを分散させながら、粉砕パルプの気流中に送り込み、積層体の1/2厚みのSAPブレンド層を形成した。
(3)パルプ・SAP積層物の上に、SMS不織布を載せて、所定の厚みになるように油圧プレス機でプレス、吸収体を幅120mm×長さ350mmにカットした。SAPブレンド層上下面のSMSを取り除いた後、SAPブレンド層の上面にホットメルト接着剤をスパイラル状に塗工した16g/m2のティッシュ(幅120mm)を接着し、更に、下面にホットメルトをスパイラル状に塗工した16g/m2のティッシュ(幅150mm)を接着した。次に、下側の幅150mmのティッシュの両サイドを15mmずつ折り返して吸収体1の幅を120mmにし、長さ350mmになるように前後端をカットした。得られた吸収体1の厚さは2.4mmであった。このようにして、SAP含有量が65質量%(SAP目付 300g/m2、パルプ目付 160g/m2)の吸収体1と、SAP含有量が55質量%(SAP目付 280g/m2、パルプ目付 230g/m2)の吸収体1を作成した。
(4)最後に、吸収体1の上面にホットメルトをスパイラル状に塗工したPEフィルムを接着し、吸収体1の下面にホットメルト接着剤をスパイラル状に塗工した親水性スルーエア不織布を接着し、繰返し吸収性能評価用の簡易おむつ(幅190mm、長400mm)を作成した。
<The absorber 1 used for the measurement and the preparation method of a simple diaper>
(1) Pulp (Weyerhaueser, NB416) slit to 5 cm width was supplied to a pulp crusher (Kamas Cell-mill) and pulverized. Next, an SMS nonwoven fabric made of PP fibers was laid on a wire net affixed on a suction box, and a wooden frame was placed thereon, and the pulverized pulp was fed for a predetermined time T for a predetermined basis weight.
(2) A screw feeder spray tube for supplying SAP particles was inserted between the pulp crusher and the suction box, and the rotation speed and supply time were set so as to obtain a predetermined basis weight during lamination. The SAP was supplied 1/4 × T seconds after the pulp was supplied, and a pulp skin layer containing no SAP was formed. Then, while dispersing SAP for 1/2 × T seconds, the mixture was fed into the air flow of pulverized pulp to form a 1 / 2-thick SAP blend layer of the laminate.
(3) An SMS nonwoven fabric was placed on the pulp / SAP laminate, and was pressed with a hydraulic press machine to a predetermined thickness, and the absorber was cut into a width of 120 mm and a length of 350 mm. After removing the SMS on the upper and lower surfaces of the SAP blend layer, a 16 g / m 2 tissue (width 120 mm) coated with a hot melt adhesive in a spiral shape is adhered to the upper surface of the SAP blend layer, and the hot melt is further adhered to the lower surface. A 16 g / m 2 tissue (width 150 mm) coated in a spiral shape was adhered. Next, both sides of the tissue having a lower width of 150 mm were folded back by 15 mm so that the width of the absorbent body 1 was 120 mm, and the front and rear ends were cut to a length of 350 mm. The thickness of the obtained absorbent body 1 was 2.4 mm. In this way, the absorbent body 1 having an SAP content of 65% by mass (SAP basis weight 300 g / m 2 , pulp basis weight 160 g / m 2 ) and an SAP content of 55% by mass (SAP basis weight 280 g / m 2 , pulp basis weight) 230 g / m 2 ) absorber 1 was prepared.
(4) Finally, a PE film coated with hot melt in a spiral shape is bonded to the upper surface of the absorbent body 1, and a hydrophilic through-air nonwoven fabric coated with a hot melt adhesive in a spiral shape is bonded to the lower surface of the absorbent body 1. And the simple diaper (width 190mm, length 400mm) for repeated absorption performance evaluation was created.
<吸収体の繰返し吸収性能の評価方法(U字吸速度の測定方法)>
1)図2に示すU字型の試験装置に、吸収性評価用の簡易おむつを前後対称に配置した。なお、U字型の試験装置は、幅が約170mmの硬質塩ビ板を曲げて作成したものであり、図2の中のRは90mm、L1は230mm、L2は210mmである。吸収性評価は、試験装置を治具で支持し、U字型の開口部が垂直上方に向くようにして行った。
2)簡易おむつの中央部に人工尿80mlを注入した後、簡易おむつ表面の人工尿を目視で観察できなくなるまでの時間(秒)を測定し、吸収速度とした。
3)3分放置して、人工尿の拡散位置にマーキングした。
4)更に7分間放置し、2回目の人工尿を注入、初回と同様に、吸収速度測定と拡散位置をマーキングした。この操作を、注入回数が4回になるまで繰返した。4回目に注入した80mlの人工尿が目視で観察できなくなるまでの時間(秒)を測定し、この時間(秒)を吸収体の繰返し吸収性能の評価の指標に用い、表1,2に「U字吸収速度4回目」として表示した。
<Evaluation method for repeated absorption performance of absorber (method for measuring U-shaped absorption rate)>
1) The simple diaper for absorptive evaluation was arrange | positioned symmetrically to the U-shaped test apparatus shown in FIG. Note that the U-shaped test apparatus was prepared by bending a hard PVC plate having a width of about 170 mm. In FIG. 2, R is 90 mm, L1 is 230 mm, and L2 is 210 mm. The absorptivity was evaluated by supporting the test apparatus with a jig so that the U-shaped opening faced vertically upward.
2) After injecting 80 ml of artificial urine into the center of the simple diaper, the time (seconds) until the artificial urine on the surface of the simple diaper could not be visually observed was measured and taken as the absorption rate.
3) After leaving for 3 minutes, the artificial urine was diffused and marked.
4) The mixture was further left for 7 minutes, the second artificial urine was injected, and the absorption rate measurement and the diffusion position were marked as in the first time. This operation was repeated until the number of injections reached 4. The time (seconds) until 80 ml of artificial urine injected for the fourth time cannot be visually observed is measured, and this time (second) is used as an index for evaluating the repeated absorption performance of the absorber. "U-shaped absorption rate 4th time".
前述の第1の方法で得たSAP粒子2を用いて作成した簡易おむつの繰返し吸収性能評価結果を表1に示す。
Table 1 shows the results of repeated absorption performance evaluation of simple diapers prepared using the
表1に示すように、繰返し吸収力指数が2以上である実施例1のSAPの粒子のみが、吸収体1中のSAP含有量が55質量%及び65質量%のいずれの場合でも、U字吸収速度4回目が60秒以下であった。これは、SAP含有量を増加させたときでも、80mlの人工尿を迅速に吸収する能力が維持されることを示している。したがって、吸収体1の薄型化が可能になる。 As shown in Table 1, only the SAP particles of Example 1 having a repetitive absorption index of 2 or more are U-shaped regardless of whether the SAP content in the absorber 1 is 55% by mass or 65% by mass. The fourth absorption rate was 60 seconds or less. This indicates that the ability to rapidly absorb 80 ml of artificial urine is maintained even when the SAP content is increased. Therefore, the absorber 1 can be thinned.
前述の第2の方法で得たSAP粒子2を用いて作成した簡易おむつの繰返し吸収性能評価結果を表2に示す。
Table 2 shows the results of repeated absorption performance evaluation of simple diapers prepared using the
表2に示すように、SAP粒子2に含まれる粒子径が300μm未満の粒子の量が10質量%以下、好ましくは9質量%以下、より好ましくは8質量%以下、より好ましくは7質量%以下、より好ましくは6質量%以下で、DW5分値が50ml/g以上、好ましくは60ml/gより大きく、かつ後期吸収速度が6ml/g・分以上である実施例1〜3は、吸収体1中のSAP含有量が55質量%及び65質量%のいずれの場合でも、U字吸収速度4回目が60秒以下であった。これは、SAP含有量を増加させたときでも、80mlの人工尿を迅速に吸収する能力が維持されることを示している。したがって、吸収体1の薄型化が可能になる。
As shown in Table 2, the amount of particles having a particle diameter of less than 300 μm contained in the
上記のように、SAP粒子2の中の粒子径300μm未満の粒子の量を減少させることにより、吸収体1の繰返し吸収性能が維持される。一方、粒子径300μm未満のSAP粒子2は、体積に対する表面積の比が大きいことから、繰返し吸収性能は低いものの、吸収速度は大きい。したがって、吸収体1の肌対向面側に配置するSAPの粒子中の粒子径が300μm未満の粒子の量を10質量%以下にし、肌対向面から非対向面に向かうに従いSAP粒子2の粒子径を減少させれば、高い繰返し吸収性能と高い吸収速度を兼ね備える吸収体1が得られる。このような吸収体1は、例えば目開き300μmの篩を用いてSAPの粒子を篩い分け、篩を通過しなかったSAP粒子2を吸収体1の肌対向面側に配置し、篩を通過したSAP粒子2を非肌対向面側に配置することにより得られる。
As described above, the repeated absorption performance of the absorbent body 1 is maintained by reducing the amount of particles having a particle diameter of less than 300 μm in the
本発明の吸収体1は、SAPを含む吸収体1を利用する全ての衛生用品に用いることができる。衛生用品の例として、公知の使い捨ておむつ、生理用ナプキン、失禁者用パッド、母乳パッドが挙げられるが、これらに限定されない。 The absorbent body 1 of the present invention can be used for all sanitary products that utilize the absorbent body 1 containing SAP. Examples of sanitary products include, but are not limited to, known disposable diapers, sanitary napkins, incontinence pads, and breast milk pads.
以上に記載した本発明は、少なくとも下記の事項に整理することができる。
高吸水性ポリマー粒子と、吸水性繊維とを含む吸収コアと、吸収コアを包被するシート部材とを備える吸収体であって、高吸水性ポリマー粒子の保水倍率が37g/g以上、高吸水性ポリマー粒子を生理食塩水に5分間浸漬したときの吸収量であるDW5分値が40ml/g以上、高吸水性ポリマー粒子の吸収量が40ml/gから50ml/gに到達する時間から算出される後期吸収速度が6ml/g・分以上、微加圧下の液体拡散性能である微加圧SFCが5×10−6・ml・秒以上で、保水倍率×後期吸収速度×微加圧SFC×103で定義される繰返し吸収力指数が2以上である。
The present invention described above can be arranged in at least the following matters.
An absorbent body comprising a highly water-absorbing polymer particle, an absorbent core containing a water-absorbing fiber, and a sheet member covering the absorbent core, wherein the water-absorbing polymer particle has a water retention ratio of 37 g / g or more, Calculated from the time it takes for the water absorption polymer particles to absorb from 40 ml / g to 50 ml / g when the DW5 minute value, which is the absorption amount when the water-soluble polymer particles are immersed in physiological saline for 5 minutes, is 40 ml / g or more. The late absorption rate is 6 ml / g · min or more, the fine pressurization SFC, which is the liquid diffusion performance under slight pressurization, is 5 × 10 −6 · ml · second or more, the water retention ratio × late absorption rate × slight pressurization SFC × The repeated absorbency index defined by 10 3 is 2 or more.
段落0034に開示した本発明は、少なくとも下記の実施の形態を含むことができる。該実施の形態は、分離して又は互いに組み合わせて採択することができる。
(1)保水倍率が39g/g以上である。
(2)DW5分値が50ml/g以上である。
(3)後期吸収速度が7ml/g・分以上である。
(4)微加圧SFCが7×10−6・ml・秒以上である。
(5)吸収体に、50〜100質量%の高吸水性ポリマー粒子と、0〜50質量%の吸水性繊維とが含まれる。
(6)高吸水性ポリマー粒子に含まれる粒子径が300μm未満の粒子の量が10質量%以下である。
(7)吸収体が使用者の肌に向き合う肌対向面と、肌対向面に対向する非肌対向面とを有し、肌対向面側に位置する高吸水性ポリマー粒子中の粒子径が300μm未満の粒子の量が10質量%以下であり、肌対向面から非対向面に向かうに従い高吸水性ポリマー粒子の粒子径が減少する。
(8)本発明の吸収体を備える衛生用品。
The present invention disclosed in paragraph 0034 can include at least the following embodiments. The embodiments can be adopted separately or in combination with each other.
(1) The water retention ratio is 39 g / g or more.
(2) The DW5 minute value is 50 ml / g or more.
(3) Late absorption rate is 7 ml / g · min or more.
(4) Slight pressurization SFC is 7 × 10 −6 · ml · second or more.
(5) The absorbent body contains 50 to 100% by mass of superabsorbent polymer particles and 0 to 50% by mass of water absorbent fibers.
(6) The amount of particles having a particle diameter of less than 300 μm contained in the superabsorbent polymer particles is 10% by mass or less.
(7) The absorbent body has a skin facing surface facing the user's skin and a non-skin facing surface facing the skin facing surface, and the particle diameter in the superabsorbent polymer particles located on the skin facing surface side is 300 μm. The amount of particles less than 10% by mass is less and the particle diameter of the superabsorbent polymer particles decreases from the skin facing surface toward the non-facing surface.
(8) A sanitary article comprising the absorbent body of the present invention.
また、本発明は、下記の実施の形態を含むことができる。該実施の形態は、分離して又は互いに組み合わせて採択することができる。
(1)高吸水性ポリマー粒子と、吸水性繊維とを含む吸収コアと、前記吸収コアを包被するシート部材とを備える吸収体であって、高吸水性ポリマー粒子を生理食塩水に5分間浸漬したときの吸収量であるDW5分値が50ml/g以上で、好ましくは60ml/gより大きく、高吸水性ポリマー粒子の吸収量が40ml/gから50ml/gに到達する時間から算出される後期吸収速度が6ml/g・分以上、好ましくは14ml/g・分以上、好ましくは16ml/g・分以上であり、高吸水性ポリマー粒子中の粒子径が300μm未満の粒子の量が10質量%以下、より好ましくは9質量%以下、より好ましくは8質量%以下、より好ましくは7質量%以下、より好ましくは6質量%以下である。
(2)吸収体に、50〜100質量%の高吸水性ポリマー粒子と、0〜50質量%の吸水性繊維とが含まれる。
(3)吸収体が使用者の肌に向き合う肌対向面と、肌対向面に対向する非肌対向面とを有し、肌対向面側に位置する高吸水性ポリマー粒子中の粒子径が300μm未満の粒子の量が10質量%以下であり、肌対向面から非対向面に向かうに従い高吸水性ポリマー粒子の粒子径が減少する。
(4)本発明の吸収体を備える衛生用品。
In addition, the present invention can include the following embodiments. The embodiments can be adopted separately or in combination with each other.
(1) and superabsorbent polymer particles, and an absorbent core comprising an absorbent fibers, said absorbent core An absorbent body and a sheet member encapsulating, 5 minutes superabsorbent polymer particles in saline The DW5 value, which is the amount absorbed when immersed, is 50 ml / g or more, preferably greater than 60 ml / g, and is calculated from the time taken for the amount of absorption of the superabsorbent polymer particles to reach 50 ml / g from 40 ml / g. Late absorption rate is 6 ml / g · min or more, preferably 14 ml / g · min or more, preferably 16 ml / g · min or more, and the amount of particles having a particle diameter of less than 300 μm in the superabsorbent polymer particles is 10 mass % Or less, more preferably 9% by mass or less, more preferably 8% by mass or less, more preferably 7% by mass or less, and more preferably 6% by mass or less.
(2) The absorbent body contains 50 to 100% by mass of superabsorbent polymer particles and 0 to 50% by mass of water absorbent fibers.
(3) The absorbent body has a skin facing surface facing the user's skin and a non-skin facing surface facing the skin facing surface, and the particle diameter in the superabsorbent polymer particles located on the skin facing surface side is 300 μm. The amount of particles less than 10% by mass is less and the particle diameter of the superabsorbent polymer particles decreases from the skin facing surface toward the non-facing surface.
(4) A sanitary article comprising the absorbent body of the present invention.
1 吸収体
2 SAP粒子
3 吸水性繊維
4 吸収コア
5 シート部材
DESCRIPTION OF SYMBOLS 1
Claims (9)
前記高吸水性ポリマー粒子の保水倍率が37g/g以上、
前記高吸水性ポリマー粒子を生理食塩水に5分間浸漬したときの吸収量であるDW5分値が40ml/g以上、
前記高吸水性ポリマー粒子の吸収量が40ml/gから50ml/gに到達する時間から算出される後期吸収速度が6ml/g・分以上、
微加圧下の液体拡散性能である微加圧SFCが5×10−6・ml・秒以上で、
保水倍率×後期吸収速度×微加圧SFC×103で定義される繰返し吸収力指数が2以上であることを特徴とする吸収体。 An absorbent body comprising a superabsorbent polymer particle, an absorbent core containing a water absorbent fiber, and a sheet member covering the absorbent core,
The water retention ratio of the superabsorbent polymer particles is 37 g / g or more,
DW5 minute value, which is the amount absorbed when the superabsorbent polymer particles are immersed in physiological saline for 5 minutes, is 40 ml / g or more,
Late absorption rate calculated from the time when the amount of absorption of the superabsorbent polymer particles reaches 40 ml / g to 50 ml / g is 6 ml / g · min or more,
The fine pressure SFC, which is the liquid diffusion performance under slight pressure, is 5 × 10 −6 · ml · second or more,
Absorbent body having a repetitive absorbency index of 2 or more defined by water retention ratio × late-term absorption rate × slightly pressurized SFC × 10 3 .
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JP2014262122A JP2016120083A (en) | 2014-12-25 | 2014-12-25 | Absorber and sanitary product comprising absorber |
KR1020177015015A KR20170099880A (en) | 2014-12-25 | 2015-10-20 | Absorbent material, and sanitary product equipped with absorbent material |
CN201580069973.3A CN107106366A (en) | 2014-12-25 | 2015-10-20 | Absorber and the amenities for possessing absorber |
PCT/JP2015/079525 WO2016103872A1 (en) | 2014-12-25 | 2015-10-20 | Absorbent material, and sanitary product equipped with absorbent material |
TW104137545A TW201628580A (en) | 2014-12-25 | 2015-11-13 | Absorbent material, and sanitary product equipped with absorbent material |
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WO2020122219A1 (en) * | 2018-12-12 | 2020-06-18 | 住友精化株式会社 | Water absorbent resin particles, absorbent, absorbent article and liquid suction power measurement method |
WO2021131301A1 (en) * | 2019-12-27 | 2021-07-01 | ユニ・チャーム株式会社 | Absorbent article |
US11635421B2 (en) | 2017-08-25 | 2023-04-25 | Lg Chem, Ltd. | SAP evaluation apparatus |
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US20200023625A1 (en) | 2017-02-22 | 2020-01-23 | Nippon Shokubai Co., Ltd. | Water absorbent sheet, elongated water absorbent sheet, and absorbent article |
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JP4969778B2 (en) * | 2004-12-21 | 2012-07-04 | 住友精化株式会社 | Method for producing water-absorbent resin particles and sanitary material using the same |
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