초록 ▼

Microcapsules with a melamine-formaldehyde or urea-formaldehyde resin capsule shell are produced by adding in advance a polyvalent isocyanate, a polyvalent isothiocyanate or a prepolymer thereof to the hydrophobic oily liquid to be encapsulated, emulsifying the hydrophobic oily liquid in an aqueous

Microcapsules with a melamine-formaldehyde or urea-formaldehyde resin capsule shell are produced by adding in advance a polyvalent isocyanate, a polyvalent isothiocyanate or a prepolymer thereof to the hydrophobic oily liquid to be encapsulated, emulsifying the hydrophobic oily liquid in an aqueous solution of a water-soluble polymer, adding an aqueous solution of melamine and formaldehyde or a precondensate thereof or urea and formaldehyde to the emulsion, and polymerizing the melamine and formaldehyde or a precondensate thereof or the urea and formaldehyde.

대표청구항 ▼

In a process for producing microcapsules which process comprises polymerizing urea and formaldehyde in the presence of a water-soluble polymer to form formaldehyde resin walls around a hydrophobic oily liquid, the improvement in which a polyvalent isocyanate, a polyvalent isothiocyanate or a prepoly

In a process for producing microcapsules which process comprises polymerizing urea and formaldehyde in the presence of a water-soluble polymer to form formaldehyde resin walls around a hydrophobic oily liquid, the improvement in which a polyvalent isocyanate, a polyvalent isothiocyanate or a prepolymer thereof is added to the hydrophobic oily liquid in an amount of about 0.02 to 1 part per 100 parts of hydrophobic oily liquid.