초록 ▼

A process for producing a powder of microcapsules characterized by adding an aldehyde resin precondensate to a microcapsule dispersion prepared in water or a hydrophilic medium with use of a water-soluble high molecular compound as an emulsifier, maintaining the resulting mixture in a condition for

A process for producing a powder of microcapsules characterized by adding an aldehyde resin precondensate to a microcapsule dispersion prepared in water or a hydrophilic medium with use of a water-soluble high molecular compound as an emulsifier, maintaining the resulting mixture in a condition for promoting polycondensation of the precondensate, and removing the dispersing medium from the reaction mixture, and a process for producing a powder of microcapsules characterized by emulsifying a hydrophobic core material containing a specific oil-soluble melamine-formaldehyde resin precondensate in water or a hydrophilic medium, subjecting the emulsion to a condition for promoting polycondensation to form capsule wall films and obtain a microcapsule dispersion, and thereafter removing the dispersing medium from the dispersion are disclosed. Further, processes for producing a non-aqueous microcapsule composition are also disclosed.

대표청구항 ▼

A process for producing a substantially agglomerate-free powder of microcapsules, comprising preparing a first dispersion of microcapsules in a dispersing medium, said dispersing medium comprising a liquid medium selected from the group consisting of water and hydrophilic substance and an emulsifier

A process for producing a substantially agglomerate-free powder of microcapsules, comprising preparing a first dispersion of microcapsules in a dispersing medium, said dispersing medium comprising a liquid medium selected from the group consisting of water and hydrophilic substance and an emulsifier comprising a water-soluble high molecular weight compound, said microcapsules of said first dispersion agglomerating upon removal of said liquid medium; admixing an aldehyde resin precondensate with said first dispersion of microcapsules; maintaining the so-formed admixture in a condition for promoting polycondensation of the precondensate; and then removing said liquid medium from said admixture to recover a substantially agglomerate-free powder of microcapsules. A process for producing a non-aqueous microcapsule composition comprising preparing a first dispersion of microcapsules in a dispersing medium, said dispersing medium comprising a liquid medium selected from the group consisting of water and hydrophilic substance and an emulsifier comprising a water-soluble high molecular weight compound, said microcapsules of said first dispersion agglomerating upon removal of said liquid medium; admixing an aldehyde resin precondensate with said first dispersion of microcapsules; maintaining the so-formed admixture in a condition for promoting polycondensation of the precondensate to form a second dispersion of microcapsules, said microcapsules of said second dispersion being substantially agglomerate free upon removal of said liquid medium; and then dispersing said microcapsules of said second dispersion in a non-aqueous medium.