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Crosslinked polymer, process for producing same, absorbent structure and absorbent article

A technology of cross-linked polymers and manufacturing methods, which is applied in the direction of absorbent pads, fabrics, transportation and packaging, etc., and can solve the problems of not meeting the water retention and absorption properties of cross-linked polymers at the same time, unbalanced performance, and insufficient absorption performance, etc.

Inactive Publication Date: 2003-09-10
SANYO CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in these methods, due to the unbalanced performance, both the water retention performance of the crosslinked polymer and the absorption performance under load cannot be satisfied at the same time, so when used in absorbent products, the absorption performance is not sufficient. , it is hoped that further improvement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0190] Add 77g of sodium acrylate, 22.85g of acrylic acid, 0.15g of N, N'-methylenebisacrylamide, 293g of deionized water, and 0.001g of dichlorotris(triphenylphosphine) ruthenium into a glass reactor with a capacity of 1L. Stir to mix while maintaining the temperature of the contents at 3°C.

[0191] Pass nitrogen through the contents to keep the dissolved oxygen content below 1ppm, then add and mix 0.3g of 1% hydrogen peroxide in water, 0.8g of 0.2% ascorbic acid in water and 0.8g of 2% 2,2'-azobis (2-imidylpropane) dihydrochloride aqueous solution, start to polymerize, reach 69 ℃ after 1.5 hours, keep this temperature, obtain aqueous gel-like polymer complex (A- 1).

[0192] The obtained hydrogel (A-1) was cut in an internal mixer, and then dried in an air-permeable belt dryer at 135° C. and an air velocity of 2.0 m / sec.

[0193] Grind the obtained dry matter, adjust it to a particle size of 30-60 meshes, add 100 g of this powder to 10% water / methanol mixed solution of 2 ...

Embodiment 2

[0196] Add 81.7g of acrylic acid, 0.15g of N, N'-methylenebisacrylamide, 241g of deionized water, and 0.001g of dichlorotris(triphenylphosphine)ruthenium into a glass reactor with a capacity of 1L, and stir and mix. The temperature of the contents was maintained at 3°C.

[0197] Pass nitrogen through the contents to keep the dissolved oxygen content below 1ppm, then add and mix 0.3g of 1% hydrogen peroxide in water, 0.8g of 0.2% ascorbic acid in water and 0.8g of 2% 2,2'-azobis The aqueous solution of (2-imidylpropane) dihydrochloride started to polymerize and reached 74° C. after 1.5 hours. The temperature was maintained, and a hydrogel-like polymer was obtained after a total of 5 hours of polymerization after the start.

[0198] After cutting this aqueous gel-like polymer in an internal mixer, 109.1 g of 30% sodium hydroxide aqueous solution was added and kneaded to obtain an aqueous gel (A-2) in which carboxylic acid was neutralized by 72%.

[0199] This hydrogel (A-2) was...

Embodiment 3

[0203] Add 77g sodium acrylate, 22.6g acrylic acid, 0.4g pentaerythritol triallyl ether and 293g deionized water, 0.001g dichlorotri(triphenylphosphine) ruthenium in a glass reactor with a capacity of 1L, stir and mix. The temperature of the contents was maintained at 3°C.

[0204] Pass nitrogen through the contents to keep the dissolved oxygen content below 1ppm, then add and mix 0.3g of 1% hydrogen peroxide in water, 0.8g of 0.2% ascorbic acid in water and 0.8g of 2% 2,2'-azobis (2-imidylpropane) dihydrochloride aqueous solution, start to polymerize, reach 69 ℃ after 1.5 hours, keep this temperature, obtain aqueous gel-like polymer complex (A- 3).

[0205] The obtained hydrogel (A-3) was cut in an internal mixer, and then dried in an air-permeable belt dryer at 135° C. and an air velocity of 2.0 m / sec.

[0206] Grind the obtained dry matter, adjust it to a particle size of 30-60 meshes, add 100 g of this powder to 10% water / methanol mixed solution of 2 g of ethylene glycol...

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PUM

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Abstract

A crosslinked polymer (A) which comprises, as essential structural units, units derived from (a) one or more vinyl monomers selected from the group consisting of water-soluble vinyl monomers and / or vinyl monomers which become water-soluble upon hydrolysis and units derived from (b) a crosslinking agent and which satisfies the following requirements: (1): (X) > / = 25g / g, (2): (Y) > / = 15g / g, and (3): (Y) > / = -0.54 (X) + 41. It has exceedingly high water retentivity and exceedingly high absorbing power under load. When applied to an absorbent structure and an absorbent article, the polymer has excellent absorbing performance. In the relationships, (X) is the amount of physiological saline retained through 1-hour absorption and (Y) is the amount of physiological saline absorbed through 1-hour standing under a load of 60 g / cm<2>.

Description

technical field [0001] The present invention relates to crosslinked polymers and methods for their manufacture, absorbent structures and absorbent articles. More specifically, it relates to a crosslinked polymer that is exceptionally excellent in water retention and absorbency under load, a method for producing the same, an absorbent structure, and an absorbent article. Background technique [0002] Currently, cross-linked polymers used in absorbent products such as disposable diapers are required to have a high water retention capacity and a high absorption capacity under load, and various methods have been used to improve them. As a method of increasing water retention, in addition to changing the amount of polymerization initiator, polymerization temperature, polymerization concentration, etc. to optimize, a method of using a chain transfer agent such as a thiol compound has been proposed (JP-A-3-179008) . In addition, as a method of improving the absorption performance...

Claims

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Application Information

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IPC IPC(8): A61F13/15A61L15/60C08F2/00C08F4/06C08F8/12C08F220/04C08F220/06C08F220/56
CPCC08F8/12C08F220/06C08F220/04Y10S428/913C08F220/56A61L15/60A61F13/15203C08F4/06C08F2810/20Y10T442/20Y10T428/31855
Inventor 田川大辅浅井辰哉岩崎义行太田义久田中敬次
Owner SANYO CHEM IND LTD
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