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Absorbing articles comprising water absorbing resin and method for producing the same

A technology of water-absorbent resin and absorbent products, applied in absorbent pads, bandages, medical science, etc., to achieve the effect of high elastic modulus and high swelling capacity

Inactive Publication Date: 2017-04-19
PROCTER & GAMBLE CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, in prior art such as J.A.Johnson et al., J.Am.Chem.Soc., 2006, 128, pp. 6564-6565 or T.Sakai et al. In Macromolecules, 2008, 41, pp. 5379-5384, there is no description about making two or more two star-shaped polymers react with each other to form an ionic network structure

Method used

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  • Absorbing articles comprising water absorbing resin and method for producing the same
  • Absorbing articles comprising water absorbing resin and method for producing the same
  • Absorbing articles comprising water absorbing resin and method for producing the same

Examples

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preparation example Construction

[0086] As described above, the reaction step of the production method is preferably carried out in a state where the dissociable group of the water-soluble unsaturated monomer forming the first star polymer and the second star polymer is protected by a protecting group. Branches of binary star polymers (and tertiary, quaternary, ... star polymers). In this case, generally, after the completion of the reaction step, a step of deprotecting the cleavable group is also included. For example, in the case where a tert-butyl group is used as a protecting group for a carboxyl group serving as a dissociable group, the carboxyl group serving as a dissociable group is made is released, and thus a water-absorbent resin including a water-soluble unsaturated monomer having a dissociable group such as acrylic acid as a main composition in the repeating unit of the main chain and having an internally crosslinked structure can be obtained.

[0087] A neutralization step is performed on the th...

Embodiment 1

[0192] (Synthesis of four-armed star core)

[0193] The four-armed star core having the chemical structure represented by the following chemical formula A is described in Scheme 1 (page 14601) of the prior art document (J.Am.Chem.Soc., 2006, 128, 14599-14605) method synthesis.

[0194] [chemical formula A]

[0195] Four Arm Star Core

[0196]

[0197] (Synthesis of Four-Armed Star Polymer (1-Br))

[0198] In a 50 ml recovery flask with a stirrer in it and filled with nitrogen, 80 mg of copper (I) bromide and 6 mg of copper (II) bromide were dissolved in 2.0 g of acetone and 14.1 g of tert-butyl acrylate. 107 mg of pentamethyldiethylenetriamine was added thereto, and the mixture was stirred at room temperature for 5 minutes. Then, 0.2 g of the four-arm star core synthesized above was added to the mixture to prepare a reaction solution. The reaction solution was stirred for 1.5 hours in an oil bath at a temperature of 50° C. while heating. The obtained solution wa...

Embodiment 2

[0240] (Synthesis of Four-Armed Star Polymer (2-Br))

[0241] Obtain the solid four-armed star-shaped polymer (2-Br) having the chemical structure (n=30) in the above chemical formula B in the same manner as "the synthesis of the four-armed star-shaped polymer (1-Br)" in Example 1 , except that the amount of tert-butyl acrylate was set to 17.6 g and the reaction time was set to 2 h.

[0242] (four-armed star polymer (2-N 3 )Synthesis)

[0243] According to " four-arm star polymer (1-N) in embodiment 1 3 ) in the same manner to obtain the solid four-arm star polymer (2-N) with chemical structure (n=30) in the above chemical formula C 3 ), the difference is that the above-synthesized four-arm star polymer (2-Br) is used instead of the four-arm star polymer (1-Br) and sodium azide (NaN 3 ) amount is set to 110 mg.

[0244] The thus obtained four-armed star polymer (2-N 3 ) had a weight average molecular weight Mw of 17,029, and a molecular weight distribution Mw / Mn th...

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Abstract

Provided are absorbing articles comprising water absorbing resin capable of exhibiting a high elastic modulus of a swollen gel while maintaining a high swelling capacity and a method for producing the same. The above-described problems are solved by an absorbing article comprising water absorbing resin including a water-soluble unsaturated monomer, which has a dissociable group, as a main component in a repeating unit of a main chain and having an internal cross-linked structure, in which a cross-linked structure index represented by the following Mathematical Formula 1 is 14 or more, a weight average molecular weight (Mw) after hydrolysis treatment is 220,000 or less, and a molecular weight distribution (Mw / Mn) after hydrolysis treatment is 3.40 or less: [Mathematical Formula 1] Cross-linked structure index = (Equilibrium swelling capacity with respect to 0.9% by weight of brine)1 / 3 / (Weight average molecular weight (Mw) after hydrolysis treatment) 1,000,000. Further, the absorbing article comprising water absorbing resin is produced by, for example, a method for producing a water absorbing resin which includes a reaction step of mutually reacting a first star-shaped polymer which includes the water-soluble unsaturated monomer as a main component in a repeating unit of each branched chain and has a first reactive functional group at the terminal of each branched chain and a second star-shaped polymer which includes the water-soluble unsaturated monomer as a main component in a repeating unit of each branched chain and has a second reactive functional group, which can form a chemical bond by mutually reacting with the first reactive functional group, at the terminal of each branched chain.

Description

technical field [0001] The present invention relates to an absorbent article comprising a water-absorbent resin, and a method for its preparation. Background technique [0002] Heretofore, water-absorbent resins have been used as one of the constituent materials of sanitary napkins, disposable diapers, or other hygienic materials that absorb body fluids. Examples of such water-absorbent resins include hydrolyzed products of starch-acrylonitrile-graft polymers, neutralized products of starch-acrylic acid-graft polymers, saponified products of vinyl acetate-acrylate copolymers, acrylonitrile copolymers or Hydrolyzed products of acrylamide copolymers, crosslinked products thereof, or partially neutralized products of poly(meth)acrylic acid. Among them, from the viewpoint of absorption properties, a water-absorbent resin formed of a cross-linked body of partially neutralized polyacrylic acid (salt) is used in many cases. All of these have a cross-linked structure and are insol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61L15/26A61L15/60
CPCA61L15/26A61L15/60B01J20/267C08L33/08A61L15/24A61F13/15203A61F13/53A61F2013/15463A61F2013/530226
Inventor 大嶌和幸光上義朗藤本拓南绘里菜P·齐佐克M·卢奇G·谢菲尔
Owner PROCTER & GAMBLE CO
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