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Powdery, cross-linked absorbent polymers method for the production thereof and their use

A polymer and absorbent technology, applied in the field of powdery cross-linked polymers, can solve the problems of a large amount of organic solvents and the inability to carry out industrial production at a cost

Inactive Publication Date: 2005-10-19
EVONIK DEGUSSA GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition to the use of polyamines and polyimines which are toxic hazards, a serious disadvantage of the process described therein is the need to use large amounts of organic solvents when handling the polymers
Cannot be produced industrially due to safety concerns and their attendant cost issues

Method used

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  • Powdery, cross-linked absorbent polymers method for the production thereof and their use
  • Powdery, cross-linked absorbent polymers method for the production thereof and their use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Polyacrylic acid obtained by solution polymerization, crosslinked with 0.7% by weight of polyethylene glycol diacrylate relative to acrylic acid and neutralized in the form of its sodium salt at 70 mol %, was dried, ground and sieved to obtain a particle size of 150 - 850 μm powder (powder A). 100 g of powder A were mixed with a solution of 1 g of 1,3-dioxolan-2-one, 3 g of water and 0.5 g of aluminum sulfate octadecahydrate under vigorous stirring and subsequently heated in an oven to 180° C. for 30 minutes.

[0080] For comparison, 100 g of powder A were mixed with a solution of 1 g of 1,3-dioxolan-2-one and 3 g of water and subsequently heated in an oven for 30 minutes to 180° C. (comparative example 1 according to DE 4020 780).

[0081] For further comparison, 100 g of powder A were mixed with a solution of 3 g of water and 0.5 g of aluminum sulfate octadecahydrate and then heated in an oven to 180° C. for 30 minutes (comparative example 2).

[0082] Product TB AAP...

Embodiment 2-6

[0089] Five kinds of powdered polyacrylic acid (powder B, C, D, E and F, each 100 g) was dried and ground and sieved to 150-850 μm and mixed with a solution of 1 g 1,3-dioxolan-2-one, 3 g water and 0.5 g aluminum sulfate octadecahydrate under vigorous stirring and then in Heat in an oven for 30 minutes to 180°C.

[0090] Product TB Crosslinker AAP 0.7 SFC TB+SFC

[0091] [g / g] Wt.-% / AA * [g / g] [10 -7 cm 3 s / g]

[0092] Powder B 30 1.1 12 0 30

Embodiment 2

[0093] Example 2 26.5 22.5 110 136.5

[0094] Powder C 32.5 0.8 10 0 32.5

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Abstract

The invention relates to crosslinked polymerizates which are capable of absorbing, which are based on partially neutralized, monoethylenically unsaturated monomers that carry acidic groups, which exhibit improved properties, in particular, with regard to their ability to transport liquids when in a swollen state, and which have been subsequently crosslinked on the surface thereof with a combination consisting of an organic crosslinker compound, with the exception of polyols, and of a cation provided in the form of a salt in an aqueous solution.

Description

[0001] This application is a divisional application of the patent application 00804612.3 of the international application PCT / EP00 / 01609 entered into China. technical field [0002] The present invention relates to powdered cross-linked polymers (superabsorbents) which can absorb water, aqueous liquids, and blood and have improved properties, in particular improved retention and improved retention of liquids under pressure ability and improved ability to transport liquids, and relates to processes for their preparation and their use as absorbents in hygiene articles and technical fields. Background technique [0003] Superabsorbents are water-insoluble cross-linked polymers capable of absorbing large quantities of aqueous liquids and body fluids such as urine or blood by swelling and forming hydrogels and retaining them under specific pressure. Due to these performance characteristics, these polymers are mainly used for incorporation into hygiene articles, such as baby diape...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61L15/00A61L15/48A61L15/60B01J20/26C08F8/00C08J3/24
CPCC08F222/1006C08F8/00B01J20/26A61L15/60A61L15/48C08J2300/14C08J3/245C08L2312/00C08L33/02C08F222/102C08F220/06
Inventor R·梅滕斯J·哈伦
Owner EVONIK DEGUSSA GMBH
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