Absorbing resin particles, process for producing same, and absorbent and absorbing article both including same

A technology of resin particles and absorbency, which is applied in absorbent pads, medical science, bandages, etc. It can solve the problems of inability to fully absorb liquids and easily produce contact dermatitis, and achieve excellent absorption performance and low absorption rate.

Active Publication Date: 2011-11-16
SDP GLOBAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Absorbent articles (disposable diapers, etc.) using conventional absorbent resin particles cannot completely absorb

Method used

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  • Absorbing resin particles, process for producing same, and absorbent and absorbing article both including same
  • Absorbing resin particles, process for producing same, and absorbent and absorbing article both including same
  • Absorbing resin particles, process for producing same, and absorbent and absorbing article both including same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0194] 155 parts (2.15 parts by mole) of the water-soluble vinyl monomer (a1-1) {acrylic acid, manufactured by Mitsubishi Chemical Corporation, with a purity of 100%}, 0.6225 parts (0.0024 parts by mole) of the crosslinking agent (b1){ Pentaerythritol triallyl ether, manufactured by Daiso Co., Ltd.} and 340.27 parts of deionized water were kept at 3° C. while being stirred and mixed. Nitrogen was passed into the mixture so that the amount of dissolved oxygen was 1 ppm or less, and then 0.62 parts of 1% hydrogen peroxide aqueous solution, 1.1625 parts of 2% ascorbic acid aqueous solution, and 2.325 parts of 2% 2,2'-isocyanate were added and mixed. Nitrobis[2-methyl-N-(2-hydroxyethyl)-propionamide] aqueous solution to start polymerization. After the temperature of the mixture reached 90°C, it was polymerized at 90±2°C for about 5 hours, thereby obtaining a hydrogel (1).

[0195]Then, while 502.27 parts of this hydrogel (1) was minced with a mincer (12VR-400K manufactured by ROYA...

Embodiment 2

[0197] Except that "1.9 parts of hydrophobic substance (C-1)" is changed to "1.9 parts of hydrophobic substance (C-2) {calcium stearate}", other manufactures obtain the present invention in the same manner as in Example 1 absorbent resin particles (2). The weight average particle diameter of the absorbent resin particles (2) was 390 μm, and the apparent density was 0.58 g / ml. In addition, 0.985% of the hydrophobic substance (C) exists inside the absorbent resin particle (2), and 0.015% of the hydrophobic substance (C) exists on the surface of the absorbent resin particle (2).

Embodiment 3

[0199] Except that "1.9 parts of hydrophobic substance (C-1)" was changed to "1.9 parts of hydrophobic substance (C-3) {zinc stearate}", this product was obtained in the same manner as in Example 1. Inventive absorbent resin particles (3). The weight average particle diameter of the absorbent resin particles (3) was 400 μm, and the apparent density was 0.58 g / ml. In addition, 0.970% of the hydrophobic substance (C) exists inside the absorbent resin particle (3), and 0.030% of the hydrophobic substance (C) exists on the surface of the absorbent resin particle (3).

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Abstract

Absorbing resin particles having an absorption rate pattern in which the absorption rate is low in the initial stage, normal in the middle stage, and high in the late stage. An absorbing article causing no problems such as a rash is provided by using the absorbing resin particles. The absorbing resin particles comprise a crosslinked polymer (A1) comprising units of a water-soluble vinyl monomer (a1) and/or a hydrolyzable vinyl monomer (a2) and units of a crosslinking agent (b), as essential structural units. In a swelling volume measurement method in which the swelling volume per g of the absorbing resin particles in saline is measured, the ratio of the time period to a swelling volume of 5 mL (t1) to the time period to a swelling volume of 40 mL (t2), t2/t1, is 5 to 20.

Description

technical field [0001] The present invention relates to absorbent resin particles, a method for producing the same, and an absorbent body and absorbent article containing the absorbent resin particles. Background technique [0002] Absorbent resin particles having a structure in which a hydrophobic substance is contained in a crosslinked polymer are known as absorbent resin particles excellent in absorption rate (Patent Document 1). [0003] Also, absorbent resin particles are known in which a hydrophobic substance is attached to the surface of a crosslinked polymer to improve powder fluidity and the like (Patent Document 2). [0004] However, the absorption rate (hereinafter, referred to as an absorption rate curve) over time after the conventional absorbent resin particles or water-absorbing agents come into contact with the absorbed liquid is not suitable. Specifically, the absorption rate curve of the conventional absorbent resin particles is (i) fast in the early stage...

Claims

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Application Information

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IPC IPC(8): C08J3/12
CPCC08J3/12A61F2013/530715C08K5/103A61L15/60C08J3/245C08J2300/14C08K5/1545C08K5/098C08J2333/02C08L29/00C08L33/02A61F13/15B01J20/26
Inventor 藤村涉史石田豪伸
Owner SDP GLOBAL
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