Uniform microcapsules

A - Human Necessities – 61 – K

Patent

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Details

A61K 9/50 (2006.01) B01J 13/14 (2006.01) B01J 13/20 (2006.01)

Patent

CA 2470376

The present invention teaches an improved process for preparing a population of microcapsules having a substantially uniform size distribution, especially useful for manufacture of carbonless paper. The improved process teaches use of membrane material having a pre-selected pore size in the capsule manufacture process. A core material is provided along with a receiving solution for receiving the core material. The receiving solution is a nonsolvent for the core material. The core material is passed under pressure through the membrane into a moving or turbulent receiving solution forming uniform droplets of core material dispersed in the receiving solution. Wall- forming material is added to the receiving solution for coating the core material droplets. The coating on the droplets is polymerized forming microcapsules. This novel process also lends itself to microcapsule formation in a continuous process.

La présente invention concerne un procédé amélioré de préparation d'une population de microcapsules présentant une répartition granulométrique sensiblement uniforme, notamment utiles pour la fabrication de papier autocopiant. Ledit procédé amélioré concerne l'utilisation de matériau membranaire présentant une dimension des pores présélectionnée dans le procédé de fabrication de capsules. Un matériau noyau est utilisé avec une solution réceptrice destinée à recevoir le matériau noyau. La solution réceptrice est un non-solvant pour le matériau noyau. Le matériau noyau est passé sous pression à travers la membrane dans une solution réceptrice mobile ou turbulente formant des gouttelettes uniformes de matériau noyau dispersées dans la solution réceptrice. Un matériau formant des parois est ajouté à la solution réceptrice pour enrober les gouttelettes de matériau noyau. L'enrobage des gouttelettes est polymérisé, formant ainsi des microcapsules. Ledit nouveau procédé permet également la formation de microcapsules dans un procédé en continu.

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