| abstract |
A process is disclosed for liquid-liquid phase separation utilizing certain inorganic polymeric materials as phaseseparation-inducing materials. The disclosed process is conducted in an aqueous liquid manufacturing vehicle and the material which emerges as a liquid phase is an aqueous solution comprising organic hydrophilic polymeric material. The liquid-liquid phase separation of this disclosure is of the type generally named ''''simple'''' coacervation wherein a major portion of the organic hydrophilic polymeric material is included in the separated, emergent, liquid phase and the phase-separation-inducing material is substantially evenly distributed, as to concentration, between the separated phase and the manufacturing vehicle. Preferred materials for use in practicing the present invention include gelatin as the organic hydrophilic polymeric material and polysilicates and polyphosphates as the inorganic polymeric phase-separation-inducing materials. The liquid-liquid phase separation of the present invention is useful for, among other things, manufacturing, en masse, minute capsules having the organic and inorganic hydrophilic polymeric material as capsule wall material. |