| 摘要 |
PURPOSE:To control the generating amount of formaldehyde by regulating the pH of a slurry liquid contg. a microcapsule to 7-11, adding a specified cyclic urea derivative shown in a general formula thereto and thereafter performing the treatment. CONSTITUTION:A hydrophobic substance is dispersed or emulsified in an acidic aq. soln. of an anionic high molecular electrolyte so that it becomes a noncontinuous fine particle. A microcapsule contg. the hydrophobic substance as a core substance is produced by adding a melamine-formaldehyde initial condensate or an urea-formaldehyde initial condensate thereto, allowing this mixture to react with each other in an acid state under the heating and forming a wall film on the surface of the fine particle. Thereafter the treatment is performed by regulating the pH of the slurry liquid contg. the microcapsule to 7-11 and adding a compd. shown in a formula I (X and Y show hydroxyl group, 1-4C alkoxy group and 1-4C hydroxyalkoxy group.) |
