Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymerizing in reactor of specified material – or in reactor...
Patent
1979-03-12
1981-03-24
Smith, Ronald H.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymerizing in reactor of specified material, or in reactor...
526 74, C08F 200, C08F 218
Patent
active
042581575
ABSTRACT:
This invention relates to a process of producing vinyl polymers by an inversion polymerization technique in the presence of a coating on the internal surfaces of the polymerization reactor. The coating on said surfaces may be a singular layer or a dual layer coating. By inversion polymerization is meant conducting the initial stage of the polymerization reaction in a medium wherein the monomer or monomers being polymerized constitute the continuous phase and in the second or later stage of polymerization, water constitutes the continuous phase. The principal coating, or undercoating when a dual layer coating is employed, comprises a protein, such as egg albumen, and when a top coating is used it comprises a water-soluble suspending agent, such as an alkyl or alkyl hydroxyalkyl cellulose ether. When polymerizing olefinic monomers, such as vinyl halides, vinylidene halides, and vinylidene monomers having at least one terminal CH.sub.2 .dbd.C> grouping, and mixtures thereof, in the presence of said coating, polymer buildup on the inner surfaces of the reaction vessel is substantially eliminated. With the present invention, multiple charges or batches of polymer can be made in said internally coated reaction vessel without opening the same between charges, thus preventing the escape of unreacted monomer to the atmosphere.
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Chils S. L.
Smith Ronald H.
The B. F. Goodrich Company
Wymbs Roy P.
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