B - Operations – Transporting – 41 – M
Patent
B - Operations, Transporting
41
M
400/1200, 400/13
B41M 5/132 (2006.01) C09D 11/00 (2006.01) C09D 11/02 (2006.01)
Patent
CA 1103824
ABSTRACT OF THE DISCLOSURE This invention relates to a process for the pro- duction of a hot melt coating composition containing micro- capsules. The process comprises the steps of preparing a dispersion of substantially discrete microcapsules in a volatile solvent continuous phase. A hot melt suspending medium is prepared, the hot melt suspending medium having a melting point of from about 50°C. to about 140°C. and a melting point range of less than about 15°C, the hot melt suspending medium being in a fluid state. The dispersion of substantially discrete microcapsules in a volatile solvent is then mixed with the fluid hot melt suspending medium with turbulent agitation to form an intimate mixture of the dispersion of microcapsules and the hot melt suspending medium. Heat and a vacuum are applied to the mixture, while maintaining the agitation, until the volatile solvent is substantially removed from the mixture to form a dispersion of substantially discrete microcapsules in the liquid hot melt suspending medium. The heat is applied at a rate sufficient to maintain the mixture at a temperature above the melting point of the melt suspending medium, the temperature also being above the boiling point of water at the vacuum level. This invention further relates to the coating composition produced by the process of this invention.
298332
Austin Robert A.
Shackle Dale R.
Ridout & Maybee Llp
The Mead Corporation
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