Process for producing monodispersed vinyl polymer fine particles

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

1988-02-03

1990-06-19

Schofer, Joseph L.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525253, 525261, 525263, 525265, 525309, 525313, 526 80, 526 87, 526202, 526214, 526225, 526279, 526234, 526328, 5263292, 526346, 526909, 526911, 521 27, 521 38, 521 65, C08F 226, C08F 222, C08F 440

Patent

active

049354698

ABSTRACT:
A process for producing monodispersed fine particles of a vinyl polymer is disclosed, which comprises polymerizing monomers containing at least one vinyl monomer selected from the group consisting of aromatic vinyl compounds, acrylic esters, and a methacrylic ester in the presence of (1) a surface active agent represented by formula (I) ##STR1## wherein R.sub.1 and R.sub.2, which may be the same or different, each represents a substituted or unsubstituted alkyl group having from 4 to 8 carbon atoms, a substituted or unsubstituted phenyl group, or a substituted or unsubstituted cyclohexyl group and M represents an alkali metal, (2) from 10.sup.-3 to 10.sup.-1 mol/l of a persulfate as a polymerization initiator, and (3) from 10.sup.-4 to 10.sup.-2 mol/l of a divalent metal sulfate as an electrolyte. Monodispersed vinyl polymer fine particles having a particle size of 1 .mu.m or greater with a very narrow size distribution are obtained.

REFERENCES:
patent: 3296170 (1967-01-01), Burkhart et al.
patent: 3449293 (1969-06-01), Burzynski et al.
patent: 3575910 (1971-04-01), Thomas
patent: 3652497 (1972-03-01), Junas et al.
patent: 4138380 (1979-02-01), Barabas et al.

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