Method of reducing impurities in aqueous acrylic monomer solutio

Details Method of reducing impurities in aqueous acrylic monomer solutio Method of reducing impurities in aqueous acrylic monomer solutio

1992-04-22

1993-05-04

Shippen, Michael L.

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

Organic compounds

Carboxylic acids and salts thereof

C07C 5142

Patent

active

052083705

ABSTRACT:
The present invention provides a method of reducing the levels of protoanemonin present in aqueous monomer solutions by adding an effective amount of one or more para-phenylenediamines having the formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are the same or different radical selected from hydrogen, methyl, ethyl, n-propyl, iso-propyl, phenyl or methoxyphenyl with the proviso that at least one of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 is hydrogen; R.sub.5, R.sub.6, R.sub.7 and R.sub.8 are the same or different radical selected from hydrogen, methyl, ethyl, n-propyl, iso-propyl, methoxy or ethoxy with the proviso that at least one of R.sub.5, R.sub.6, R.sub.7 and R.sub.8 is hydrogen; and salts thereof.

REFERENCES:
patent: 3674651 (1972-07-01), Otsuti
patent: 3725208 (1973-04-01), Maezawa et al.
patent: 3893895 (1975-07-01), Dehnert et al.
patent: 4828652 (1989-05-01), Schropp

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