Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1987-06-24
1989-05-23
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524834, 526 68, 526 88, 5263442, C08L 300
Patent
active
048331805
ABSTRACT:
A process for preparing vinyl chloride homopolymer or copolymer latexes, comprising carrying out the polymerization of a monomer composition in a reaction medium in emulsion or in microsuspension and continuously condensing a vapor fraction of said monomer composition and continuously refluxing said condensed vapor fraction into said reaction medium, degassing the resultant polymer, and carrying out the polymerization under agitation by means of a paddle agitator with a rotating shaft having at least one paddle and at least one deflector with the speed gredient between said at least one paddle and said at least one deflector being between 5 and 50 s.sup.-1 ; the peripheral rotational speed of the agitator is maintained in the range of about 1.1 to 2.1 meters/second for about 50% to 100% of the duration of the polymerization period preceding the beginning of reflux (P.sub.1) and the period which separates the end of reflux from the beginning of degassing (P.sub.3), and at a speed in the range of about 0.4 to 1 meters/second for about 50% to 100% of the duration of the reflux period (P.sub.2) and the degassing period (P.sub.4).
REFERENCES:
patent: 3544539 (1970-12-01), Koyanagi
patent: 3612877 (1972-08-01), Czekay
patent: 4125574 (1978-11-01), Kastner
Atochem
Mulcahy Peter D.
Schofer Joseph L.
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