Phenothiazine derivatives

Details Phenothiazine derivatives Phenothiazine derivatives

1987-07-30

1989-08-08

Raymond, Richard L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D27920

Patent

active

048554243

ABSTRACT:
A composition having the formula ##STR1## wherein n has an average value of one to about five, is disclosed for use in reducing or eliminating the formation of reactor scale during the polymerization of vinyl chloride and comonomers. The composition is prepared by reacting phenothiazine with formaldehyde in the presence of a liquid diluent that is a solvent for the phenothiazine, but a non-solvent for the dimer of phenothiazine and formaldehyde. The process of the invention is preferably conducted in the presence of a strong acid catalyst. The formaldehyde is preferably added slowly to the reaction mixture over the course of the reaction. The product can be filtered and dried.

REFERENCES:
patent: 4229510 (1980-10-01), Watarai et al.
patent: 4565834 (1986-01-01), Buysch et al.
Romanovich et al., Chemical Abstracts, vol. 98 (1983) 144251d.

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