Process for recovering vinyl polymers from emulsion polymerizati

Details Process for recovering vinyl polymers from emulsion polymerizati Process for recovering vinyl polymers from emulsion polymerizati

1980-03-03

1981-09-29

Henderson, C. A.

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

Synthetic resins

Treating polymer containing material or treating a solid...

210723, 260 296PT, 526212, 528502, C08F 614, C08F 616

Patent

active

042924243

ABSTRACT:
The invention relates to the production of vinyl dispersion or paste resins by means of the emulsion polymerization process and the recovery of the resins from the polymer latices produced thereby. In the process, the polymer latex is first carefully coagulated to yield a fast filtering sludge, the sludge is passed to a pressure filter to separate a high solids, friable polymer wetcake from the serum, the wetcake is rinsed with proper agents to neutralize the same and remove undesirable residues, pressure in the filter is applied to the rinsed wetcake to increase the solids content thereof, the wetcake is then broken into particles and friable agglomerates, and thereafter said particles and agglomerates are dried and ground to proper size in one step in a fluid energy mill. Thus the spray drying and the subsequent harsh grinding steps are eliminated producing a superior product for plastisols.

REFERENCES:
patent: 2844568 (1958-07-01), Mertz
patent: 3595840 (1971-07-01), Moberly
patent: 3901842 (1975-08-01), Dembowski
patent: 3954910 (1976-05-01), Kropp
patent: 3956249 (1976-05-01), Goodman
patent: 4138539 (1979-02-01), Landolt
patent: 4168373 (1979-09-01), Nickerson
patent: 4197399 (1980-04-01), Noel

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