Title:
N-METHYLOLACRYLAMIDE CRYSTAL, PROCESS FOR PRODUCING THE SAME, AND METHOD OF STORING THE SAME
Document Type and Number:
WIPO Patent Application WO/1996/008467
Kind Code:
A1
Abstract:
Crystalline N-methylolacrylamide (N-MAA) produced by the reaction of acrylamide with formaldehyde is washed with water and/or a water-soluble organic medium to give N-MAA crystals substantially free from a formaldehyde-like odor and having a compression strength of at most 3 kg/cm2 after being left to stand under the load of 200 g/cm2 for two months. The crystalline N-MAA substantially free from a formaldehyde-like odor is exposed to an atmosphere containing an acidic or basic gas to obtain N-MAA crystals which cause little caking. The crystalline N-MAA substantially free from a formaldehyde-like odor is stored in an atmosphere containing an acidic or basic gas. It has become possible to remove the formaldehyde-like odor of the N-MAA crystals, reduce the caking thereof in the long-term storage, improve the working environment more hygienically, and shorten the process steps.
Inventors:
NIWA KIYONOBU
YANO YUYA
HAMANAKA KOJI
YOSHIDA NORIMASA
YANO YUYA
HAMANAKA KOJI
YOSHIDA NORIMASA
Application Number:
PCT/JP1995/001810
Publication Date:
March 21, 1996
Filing Date:
September 13, 1995
Export Citation:
Assignee:
NITTO CHEMICAL INDUSTRY CO LTD (JP)
International Classes:
C07C231/12; C07C233/20; (IPC1-7): C07C233/20; C07C231/08; C08F20/58
Foreign References:
| JPS4914418A | 1974-02-07 | |||
| JPS5014623A | 1975-02-15 | |||
| JPS63270653A | 1988-11-08 | |||
| JPS63216855A | 1988-09-09 | |||
| JPS5089325A | 1975-07-17 |
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