Title:
UNIFORM MICROCAPSULES
Document Type and Number:
WIPO Patent Application WO2003078043
Kind Code:
A3
Abstract:
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.
Inventors:
SEEHAFER TROY RONALD
STAHLER GEORGE ARTHUR
STAHLER GEORGE ARTHUR
Application Number:
PCT/US2003/001801
Publication Date:
December 04, 2003
Filing Date:
January 22, 2003
Export Citation:
Assignee:
APPLETON PAPER INC (US)
International Classes:
B01F3/08; B41M5/165; B01F5/04; B01F5/06; B01J13/14; B01J13/20; C09B67/08; (IPC1-7): A61K9/50
Foreign References:
| US6103271A | 2000-08-15 | |||
| US4938900A | 1990-07-03 |
Other References:
See also references of EP 1490167A4
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