Suspension polymerization process

Details Suspension polymerization process Suspension polymerization process

1976-05-24

1977-04-12

Wong, Jr., Harry

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

260880R, 526346, C08F 1204, C08F 1208

Patent

active

040176703

ABSTRACT:
The production of polymer beads by a suspension polymerization in which a vinyl aromatic monomer having a free-radical generating catalyst dissolved therein is suspended in an aqueous medium with the aid of from 0.2 to 1.0 per cent by weight, based on monomer, of a finely divided phosphate suspending agent and heated to cause the monomer to polymerize into polymer beads is improved by treated the aqueous medium containing the phosphate and any extender with ultrasound prior to adding the monomer and polymerizing. The resulting polymer bead size is thereby found to be smaller than would have been obtained without the use of ultrasound.

REFERENCES:
patent: 2524627 (1950-10-01), Hohenstein
patent: 3328374 (1967-06-01), Ronden et al.
patent: 3442881 (1969-05-01), Jahn et al.
patent: 3449311 (1969-06-01), Lowell
patent: 3488745 (1970-01-01), Wright

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