Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1989-01-24
1991-03-05
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
523333, 523334, 427221, C08J 704
Patent
active
049978640
ABSTRACT:
A process for the preparation of composite particle dispersons is disclosed. The composite particles have a core particle 1 surrounded by a second material 2. Normally a core shell particle will be formed and the second material which forms the shell will be a polymer material.
The composite particles are formed by mixing a dispersion of polymer particles with pre-formed core material particles. The polymer particles are stabilized relative to one another, and the core material particles are destabilized in the dispersion so that they are able to make contact with the surfaces of the polymer particles. The process takes place at a temperature above the operative glass transition temperature of the polymer, and in the process the polymer spreads over the surface of the core particle so that the core particle is encapsulated.
The process will proceed, and composite particles will be formed, when the interfacial energies of the three interfaces (core/polymer: core/liquid: polymer/liquid) and the relative volumes of the core particles and polymer particles are related to one another in accordance with an equation which is set out in the specification.
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Polymer Handbook 2nd Ed., Brandrup, J; Immergut, E. H., Editors, John Wiley & Sons, New York, 1975.
Chemical Abstracts, Pressure-fixing type capsule toners. Canon K. K. Jpn. Kokai Tokkyo Koho 80 89,855, vol. 94, 1981.
Imperial Chemical Industries plc
Schofer Joseph L.
Weber Tom
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