Phenothiazine composition for use in reactor scale prevention

Details Phenothiazine composition for use in reactor scale prevention Phenothiazine composition for use in reactor scale prevention

1988-06-30

1989-08-01

Raymond, Richard L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

203 8, 203 9, 208 48AA, 526 79, 526204, 526344, 544 35, C07D27970

Patent

active

048534463

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: 3565834 (1986-01-01), Buysch et al.
patent: 4229510 (1980-10-01), Watarai et al.
patent: 4529500 (1985-07-01), Miller et al.
Romanovich et al., Chemical Abstracts, vol. 98 (1983), 144251d.

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