US 4,024,301 AGranted

Internally coated reaction vessel for use in olefinic polymerization

AssigneeThe B. F. Goodrich Company

InventorsDonald E. Witenhafer, James B. Haehn, Louis Cohen

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Abstract

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, a straight chain or branched polyaromatic amine dissolved in an aqueous alkali metal 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.

Claims25

Dependent claims

A process for substantially eliminating the build-up of polymers on the internal surfaces of a polymerization reaction vessel which comprises applying to said surfaces a coating solution comprised of a straight chain or branched polyaromatic amine having a molecular weight greater than about 250 and having at least 2 --OH groups per 1000 molecular weight dissolved in an aqueous alkali metal hydroxide solution, said polyaromatic amine having the structure selected from the group consisting of ##STR14## wherein (1) A, B, and C are selected from the group consisting of ##STR15## wherein R.sub.3 is --H, halogen, or an alkyl group containing from 1 to 8 carbon atoms and may be the same or different;

R.sub.4 is --H, --OH, --NH.sub.2 or an alkyl group containing from 1 to 8 carbon atoms and may be the same or different;
and R.sub.5 is ##STR16## or a straight chain or branched alkylene or alkylidene group containing from 1 to 5 carbon atoms;
and ##STR17## wherein R.sub.3 and R.sub.4 are the same as for (a);
and wherein A, B, and C may be the same or different and each repeating unit may be the same or different;
(2) R.sub.1 and R.sub.2 are either --H, --OH, --NH.sub.2, or ##STR18## and may be the same or different and wherein R.sub.3 and R.sub.4 are the same as for (a);
and (3) x is an integer from 1 to 20 and y is an integer from 0 to 20;
and ##STR19## wherein (4) A, B, R.sub.1, R.sub.3, R.sub.4 and R.sub.5 are the same as in I and R.sub.2 is --H, or ##STR20## as defined in (2);
and (5) x is an integer from 1 to 4 and y is an integer from 1 to 15.

5 more elements

Dependencies are inferred from the claim text.