Process for producing monodisperse vinyl polymer fine particles

Details Process for producing monodisperse vinyl polymer fine particles Process for producing monodisperse vinyl polymer fine particles

1988-02-03

1990-03-27

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526328, 5263292, 526346, 526347, 526909, 525 59, 525243, 5253304, 5253306, C08F 208

Patent

active

049121847

ABSTRACT:
A process for producing monodisperse vinyl polymer fine particles is disclosed, which comprises polymerizing at least one monomer selected from the group consisting of vinyl aromatic compounds, acrylic esters, and methacrylic esters as dissolved in an organic solvent or a mixed solvent of water and an organic solvent, which is capable of dissolving said monomer or monomers but incapable of dissolving a produced polymer, wherein said polymerizing is carried out in the presence of partially saponified polyvinyl alcohol having a degree of saponification of from 5 to 75 mol % and a number average degree of polymerization of from 100 to 3,000 as a dispersion stabilizer and in the presence of a polymerization initiator. Monodisperse polymer particles having a particle size of the order of micron with a narrow size distribution can be obtained through the one-step polymerization.

REFERENCES:
patent: 2980655 (1961-04-01), Glass et al.
patent: 3919140 (1975-11-01), Hirata et al.
patent: 4208499 (1980-06-01), Maruhashi et al.
Noro, Hydrolysis of Polyvinyl Acetate to Polyvinyl Alcohol, in Polyvinyl Alcohol, Finch (ed.) J. Wiley and Sons, N.Y., 94, 109 (1973).

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