Moisture-absorbing and desorbing polymer and compositions derived therefrom

a technology applied in the field of moisture absorption and desorption polymer and compositions derived therefrom, can solve the problems of slow absorbing rate, low moisture absorption capacity, and difficulty in regeneration

Inactive Publication Date: 2002-01-24
JAPAN EXLAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although such moisture absorbents have much moisture absorbing capacity and quick moisture absorbing rate, they are deliquescent and, therefore, there are disadvantages that they are liquefied after absorption of moisture and soil other substance, apt to be dissolved and difficult for their regeneration.
Although other moisture absorbents such as silica gel, zeolite, sodium sulfate, active alumina and active carbon do not have such a problem, they have disadvantages that their moisture absorbing capacity is low, their moisture absorbing rate is slow, their regeneration require a high temperature and their repeated absorption and desorption of moisture result in pulverization which are causes that their practical use is disturbed.
However, in the case of such ultra water-absorbing resins, their water-absorbing property is very good but their moisture-absorbing property is not satisfactory.
The specific problems are that their retention of water is so high that desorption of moisture hardly occurs, an equilibrium moisture absorption capacity at low humidity is low, they become tacky with absorption of moisture and their moisture absorbing rate is slow.
However, slow moisture-absorbing and desorbing rates have been still pointed out as a problem.
However, the time necessary for moisture absorption is in a level of hours (in the Examples, a significant increase in moisture absorption is noted during ten hours) and such a method is not satisfactory for the use requiring the moisture absorbing rate in the level of minutes or even seconds such as a rotary dehumidifier.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0044] Amberlite IRC 76 (a weakly acidic cation-exchange resin manufactured by Rohm & Haas) was made into a potassium type using a 1N aqueous solution of potassium hydroxide. Then the said resin was pulverized into fine particles of 10 .mu.m or smaller using "Dyno-Mill" of Glen Mills Inc. Amount of carboxyl group of a potassium type in the resulting fine particles was 7.1 meq / g while the equilibrium moisture-absorbing ratio was 48%. To 100 parts of the fine particles of the moisture-absorbing and desorbing polymer were added 50 parts of a vinyl acetate emulsion containing 55% solid as a binder to prepare a liquid for application. The said liquid was applied to a paper (of a weight of 40 g / m.sup.2) to make the carried amount of the said polymer 50 g / m.sup.2 followed by drying. After drying, the resulting paper containing the moisture-absorbing and desorbing polymer particles was subjected to a corrugating treatment and the two-minute moisture-absorbing and desorbing rates were measur...

example 2

[0047] An acrylonitrile type polymer (10 parts) consisting of 90% by weight of acrylonitrile and 10% by weight of methyl acrylate was dissolved in 90 parts of 48% aqueous solution of sodium thiocyanate, the resulting polymer solution was impregnated into and adhered to a polypropylene nonwoven fabric to such an extent that the amount as a polymer solid was 30 g / m.sup.2, and the fabric was dipped in water (20.degree. C.) which was a non-solvent to coagulate whereupon a sheet product was prepared. The resulting sheet was well washed with water, then 50 parts of 60% by weight of hydrazine and 850 parts of water were added to 100 parts of the acrylonitrile type polymer carried on the sheet, a hydrazine treatment was carried out at 90.degree. C. for 3 hours to introduce cross-links thereinto, then 100 parts potassium hydroxide were added thereto and a reaction was carried out at 120.degree. C. for 5 hours to hydrolyze the remaining nitrile group whereupon a sheet carrying the moisture-a...

example 3

[0048] The same operation as in Example 2 was carried out except that a solution of acrylonitrile type polymer solution prepared in Example 2 was spun from a spinning nozzle having a pore diameter of 60 .mu.m into a spinning bath where the bath temperature was -2.degree. C and 15% aqueous solution of sodium thiocyanate was used as a non-solvent followed by elongating and washing with water to give fibrous acrylonitrile type polymer whereupon a fibrous moisture-absorbing and desorbing polymer having a fiber diameter of about 18 .mu.m of the present invention was prepared. After that, 50 parts of the said fiber, 40 parts of pulp and 10 parts of vinylon fiber were mixed and made into paper to give paper which was a paper product of a weight of 100 g / m.sup.2 containing a fibrous moisture-absorbing and desorbing polymer. This paper was corrugated under the already-mentioned condition and the two-minute moisture-absorbing and desorbing rates were measured. Result of the evaluation is show...

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Abstract

Disclosed herein is a moisture-absorbing and desorbing polymer, characterized in that, the said polymer is an organic high-molecular substance containing 1.0-8.0 meq/g of carboxyl group of a potassium type and having a cross-linking structure.

Description

[0001] The present invention relates to a moisture-absorbing and desorbing polymer having high moisture-absorbing and desorbing properties and particularly having high moisture-absorbing and desorbing rates and also relates to compositions containing the same.PRIOR ART[0002] With regard to a means for removing moisture in air, moisture absorbents such as lithium chloride, calcium chloride, magnesium chloride and phosphorus pentaoxide have been used. However, although such moisture absorbents have much moisture absorbing capacity and quick moisture absorbing rate, they are deliquescent and, therefore, there are disadvantages that they are liquefied after absorption of moisture and soil other substance, apt to be dissolved and difficult for their regeneration. Although other moisture absorbents such as silica gel, zeolite, sodium sulfate, active alumina and active carbon do not have such a problem, they have disadvantages that their moisture absorbing capacity is low, their moisture a...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B01D53/28A61L15/60B01J20/26C08F8/00C08F8/42C08F8/44C08F8/46C08L101/08
CPCA61L15/60C08F8/44C08F8/42
Inventor NISHIDA, RYOSUKE
Owner JAPAN EXLAN CO LTD
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