| 摘要 |
PURPOSE:To efficiently effect the reaction of formaldehyde to remove the formaldehyde by preliminarily add saccharides to an anion polymer electrolyte soln. to be used for the preparation of microcapsule dispersion, and then adjusting the dispersion to >pH 11 after the capsule wall film is formed. CONSTITUTION:The microcapsule dispersion is prepared by using formaldehyde as one component of the material of capsule wall film and effecting the condensation polymn. of the capsule film material in an anion polymer electrolyte soln. in the presence of an acid catalyst so as to cover the hydrophobic core material. In this process, saccharides such as glyceraldehyde are incorporated into the aq. soln. of anion polymer electrolyte having -COO<->, -SO3<->, -OPO3<2->, etc. After the capsule wall film is formed, the dispersion is adjusted to >pH 11 by adding caustic soda thereto to efficiently effect the reaction of residual formaldehyde and to remove the formaldehyde. The capsule wall material is a combination of at least one aldehyde and amines, including formaldehyde as the essential component. |
