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Absorbent material and absorbent article

An absorbent, vinylic technology that is used in absorbent pads, thin material handling, transportation and packaging to solve problems such as easy damage to porous structures

Inactive Publication Date: 2004-04-28
DAINIPPON INK & CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this water-absorbing absorbent material is obtained by swelling a water-absorbing polymer with water absorption and freeze-drying, and has the disadvantages that the structure is loose, and the porous structure is easily broken when pressure is applied.

Method used

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  • Absorbent material and absorbent article
  • Absorbent material and absorbent article
  • Absorbent material and absorbent article

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0023] In the production method described later, primary particles having an average particle diameter of 1 to 50 μm are first produced, and the primary particles are gradually melted in the production process, thereby forming absorbent resin particles. Such as figure 1 As shown in the electron micrograph of , by forming a structure having primary particle fusion, pores are formed in the absorbent resin particles, the surface area of ​​the absorbent resin particles is increased, and the wettability to blood can be improved.

[0024] The pores of the water-absorbent resin used in the present invention are interstices of primary particles formed by fusion of primary particles, and are expected to adsorb blood cells in blood or move blood into the absorbent resin particles. The fine pores are generally larger than the average particle diameter of the primary particles, and the diameter thereof is 1 to 100 μm.

[0025] In the method of mercury injection in the present invention, ...

Embodiment

[0114] Hereinafter, the present invention will be described more specifically by way of examples and comparative examples. Unless otherwise specified, "%" in the following is based on weight. The various properties of the material were measured by the methods shown briefly below. Table 1 summarizes the compositions of Examples 1 to 3 and Comparative Example 1 and Comparative Example 2.

[0115] [Measuring method of blood absorption amount]

[0116] In 20 ml of horse defibrinated blood (purchased from Japan Biomaterials Center) in a Petri dish with an inner diameter of 95 mm, 15 overlapping toilet papers (55 mm × 75 mm) were immersed, and the absorbent obtained in the examples described later was added to the paper. About 1 g of permanent resin particles was absorbed for 5 minutes, and then the swollen gel of the resin was collected and its weight was measured. The blood absorption amount (g / g) was calculated by dividing the weight of the resin particles before absorption by...

reference example 1

[0125] Reference example 1 (manufacturing example of polysuccinimide)

[0126] 96 g of maleic anhydride and 50 g of ion-exchanged water were added to a 1 L 4-necked flask equipped with a stirring device, a thermometer, a reflux device, and a nitrogen blowing device. Then, after heating to 55 degreeC and dissolving maleic anhydride, after cooling, the slurry of maleic anhydride was obtained. The system was reheated, and when it reached 55°C, 60.8 g of 28% ammonia water was added. Then, the temperature of the system was raised to 80°C. After reacting for 3 hours, the obtained aqueous solution was dried to obtain a reaction intermediate. Add 100 g of the reaction intermediate and 85% phosphoric acid into a 2 L eggplant-shaped flask, and react under reduced pressure at 200° C. in an oil bath for 4 hours using a rotary evaporator. The obtained product was washed several times with water and methanol. The weight average molecular weight of the obtained polysuccinimide measured b...

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Abstract

An absorbent material which comprises an absorbent resin containing a polyacidic amino acid as a constituent component of the resin and having a structure in which primary particles are agglomerated and including pores having a total pore volume as measured by a mercury penetration method of 0.5 to 5.0 cm<3> / g.

Description

technical field [0001] The present invention relates to novel and useful absorbent materials and absorbent articles. Background technique [0002] For a long time, as blood-absorbing articles such as sanitary pads or sanitary napkins, it has been known to use liquid-permeable surface materials made of non-woven fabrics and the like and polyethylene sheets or polyethylene sheets. Liquid-impermeable leak-proof materials made of laminated non-woven fabrics are interposed with absorbers made of hydrophilic absorbent paper or fluffy pulp that can physically absorb and retain blood. Among them, regarding the material of the absorber, instead of absorbent paper or pulp, it has been proposed to use a water-absorbent resin to increase the absorption capacity of blood, retain the absorbed blood, and prevent leakage. [0003] Such water-absorbing resins have hitherto known hydrolyzate of starch-acrylonitrile graft copolymer or carboxymethyl cellulose cross-linked product, polyacrylic ...

Claims

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Application Information

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IPC IPC(8): A61L15/24A61L15/60
CPCA61L15/60Y10T428/249986A61L15/24
Inventor 田中寿计长谷川义起浅田匡彦
Owner DAINIPPON INK & CHEM INC
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