초록 ▼

This invention relates to a process for making microscopic size capsules from an emulsion having an inner oily or hydrophobic phase (material to be encapsulated) and an outer hardenable hydrophilic phase. The process is characterized by the step of contacting said emulsion with a break-up fluid capa

This invention relates to a process for making microscopic size capsules from an emulsion having an inner oily or hydrophobic phase (material to be encapsulated) and an outer hardenable hydrophilic phase. The process is characterized by the step of contacting said emulsion with a break-up fluid capable of dividing said emulsion into substantially separate capsules having an inner hydrophobic phase and an outer hardenable hydrophilic phase; and then hardening the hydrophilic phase of said capsules to form microscopic size capsules or microencapsulations. The separated capsules can contain clusters of capsules, or they may be made as separate, individual capsules. In the preferred embodiment, the break-up fluid contains a surfactant capable of enhancing the break-up function of the fluid so that the separated capsules are predominately individual capsules. This invention also relates to microscopic size capsules formed by this process.

대표청구항 ▼

A process of making microcapsules having transparent capsule shells containing a hydrophobic liquid which is characterized by: 1. forming an emulsion comprising an outer hydrophilic phase and droplets of a hydrophobic liquid suspended therein as the inner hydrophobic phase, said outer hydrophilic ph

A process of making microcapsules having transparent capsule shells containing a hydrophobic liquid which is characterized by: 1. forming an emulsion comprising an outer hydrophilic phase and droplets of a hydrophobic liquid suspended therein as the inner hydrophobic phase, said outer hydrophilic phase comprising a hardenable wall forming polymeric material dissolved in an aqueous solvent; 2. contacting said emulsion with a break-up fluid which is not a solvent for said polymeric material, which is substantially immiscible with the polymeric material solvent, and which is capable of dividing said emulsion into separate capsules having an inner hydrophobic phase and an outer hydrophilic phase; 3. then hardening the hydrophilic phase of said capsules with a hardening liquid which is substantially miscible with the break-up bath, which is not a solvent for said polymeric material, and which is, of itself or in combination with another liquid, substantially immiscible with said polymeric material solvent.