High moisture adsorptive and desorptive fine particles and proce

Details High moisture adsorptive and desorptive fine particles and proce High moisture adsorptive and desorptive fine particles and proce

1997-01-23

1997-11-25

Zitomer, Fred

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

5253291, 5253294, 5253285, 525366, 525376, 526909, C08F 832, C08F 830

Patent

active

056914210

ABSTRACT:
Fine particles (having a particle diameter smaller than 10 .mu.m) of crosslinked acrylonitrile polymer capable of absorbing and releasing a large amount of moisture, in which the acrylonitrile polymer is crosslinked with hydrazine such that the nitrogen content increases by 1.0-15.0 wt % and there being introduced salt type carboxyl groups in an amount of 1.0 mmol/g or more into a part of the remaining nitrile groups. Said fine particles are prepared by treating an emulsion of acrylonitrile polymer with hydrazine so that crosslinks are formed in the acrylonitrile polymer and the nitrogen content increases by 1.0-15.0 wt % and then hydrolyzing the crosslinked acrylonitrile polymer so as to introduce more than 1.0 mmol/g of carboxyl groups in salt form into nitrile groups remaining uncrosslinked and to introduce amide groups to the rest of nitrile groups.

REFERENCES:
patent: 4172066 (1979-10-01), Zweigle
patent: 4272422 (1981-06-01), Tanaka
patent: 5292822 (1994-03-01), Tanaka
Derwent Publications Ltd., London, GB; AN 94-355268 & JP-A-06 280 110 (Toyobo) (Oct. 14, 1994) (abstract).
Derwent Publications Ltd., London, GB; AN 90-150286 & JP-A-02 091 27 (Japan Exlan) (Mar. 30, 1990) (abstract).

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