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POLYMERIZATION METHOD FOR PRODUCING NON-AQUEOUS DISPERSIONS OF MICROPARTICLES AND COATING COMPOSITIONS; THAT CONTAIN THIS MICROPARTICLE.
POLYMERIZATION METHOD FOR PRODUCING NON-AQUEOUS DISPERSIONS OF MICROPARTICLES AND COATING COMPOSITIONS; THAT CONTAIN THIS MICROPARTICLE.
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机译:制备微粒和涂料组合物非水分散体的聚合方法;含有这种微粒。
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摘要
A process is described for making sterically stabilized non-aqueous dispersions of polymer microparticles, in which (1) monomers including at least one crosslinking monomer are polymerized in an aqueous medium at a temperature at least 10 DEG higher than the glass transition temperature of the polymer to be formed, in the presence of a block or graft copolymer stabilizing 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 stabilizing chains of the particles.
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