Polymerization process

Details Polymerization process Polymerization process

1980-12-08

1982-06-29

Schofer, J. L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

525303, 526202, 526320, 526322, 524820, 524824, 524529, 524533, 524458, C08K 509

Patent

active

043371892

ABSTRACT:
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.degree. 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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patent: 3963685 (1976-06-01), Abrahams
patent: 4025484 (1977-05-01), Evani et al.
patent: 4180619 (1979-12-01), Makhlouf et al.

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