Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

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
View PDF23 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
boiling pointaaaaaaaaaa
sizeaaaaaaaaaa
Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com