B - Operations – Transporting – 01 – F
Patent
B - Operations, Transporting
01
F
400/3028
B01F 17/42 (2006.01) C09D 3/48 (1980.01)
Patent
CA 1164131
V. 31077 ABSTRACT OF DISCLOSURE A process is described for making sterically stabilised non-aqueous dispersions of polymer microparticles, in which (1) monomers including at least one crosslinking monomer are polymerised in an aqueous medium at a temperature at least 10° higher than the glass transition temperature of the polymer to be formed, in the presence of a block or graft copolymer stabilising agent containing in the molecule, as the component solvated by the aqueous medium, a polymer chain derived from a polyethylene glycol of molecular weight at least 1000, under conditions such that there is at no time present a separate monomer phase and (2) the microparticles thus obtained are transferred into a non-aqueous medium which is capable of dissolving the polyethylene glycol in question, when the latter is in the non-hydrated state, to the extent of at least 10% by weight at room temperature. The microparticles are of value for incorporation into coating compositions the main film-forming constituent of which is compatible with the polyethylene glycol- derived stabilising chains of the particles.
366381
Bromley Charles
Thompson Morice W.
Imperial Chemical Industries Limited
Roussin Bernard F.
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