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US 4,068,059 AGranted
Internally coated reaction vessel for use in olefinic polymerization
AssigneeThe B. F. Goodrich Company
InventorDonald Edward Witenhafer
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AssigneeThe B. F. Goodrich Company
InventorDonald Edward Witenhafer
Estimating the term…
This invention relates to a polymerization reaction vessel having a coating on the inner surfaces thereof resulting from applying thereto a coating composition containing, as a primary ingredient, an alkali soluble dye dissolved in an aqueous alkali metal hydroxide solution or an ammonium hydroxide solution. When polymerizing olefinic monomers, such as vinyl halides, vinylidene halides, and vinylidene monomers having at least one terminal CH.sub.2 =C< grouping, and mixtures thereof, in the presence of said coating, polymer build-up on the inner surfaces of the reaction vessel is substantially eliminated. Further, 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.
A process for substantially eliminating the build-up of polymers on the internal surfaces of polymerization reaction vessel which comprises applying to said surfaces a coating solution comprised of a dye dissolved in an aqueous alkali metal hydroxide or ammonium hydroxide solution, said dye being selected from the group consisting of acridines, azines, oxazines, thiazines, and alkali soluble dyes having in their chemical structure one or more radicals selected from the group consisting of --OH, --COOH, --SO.sub.3 H, and --SO.sub.3 Na, and wherein said radicals may be the same or different on any one dye structure.
Dependencies are inferred from the claim text.