| 摘要 |
PROBLEM TO BE SOLVED: To provide an N-methylol acrylamide (N-MAA) crystal, especially the N-methylol acrylamide crystal substantially free from formaldehyde smell and having little caking properties; and to provide a method for producing the N-methylol acrylamide crystal. SOLUTION: The N-MAA crystal having little caking properties is obtained by subjecting a crystalline N-MAA to exposing treatment to an atmosphere containing an acidic gas or a basic gas. The crystalline N-MAA having substantially free from the aldehyde-like smell is held and stored in the atmosphere containing the acidic gas or the basic gas. As a result, the formaldehyde-like smell of the N-MAA crystal is removed, and the caking properties under long-term preservation are reduced to hygienically improve the working environment in a using scene, and to simplify the operation process. COPYRIGHT: (C)2008,JPO&INPIT
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