now available with only
15 ppm INHIBITOR ι* Distillation, or washing with caustic, to remove inhibitor may be eliminated. ^ With such a low inhibitor concentration . . . less catalyst is required to overcome inhibitor; poly merization begins sooner and thus total polymerization time is shorter; there is less tendency for color develop ment due to inhibitor.
Methyl acrylate and ethyl acrylate containing only 15 ppm monomethyl ether of hydroquinone are now available in commercial quantities from Rohm & Haas. Storage stability has been thoroughly tested. Even when exposed for several months to the highest 4
C&EN
temperatures expected under the most unusual ship ping or storing conditions, these acrylate monomers show no evidence of polymer formation. Grades con taining 200 ppm inhibitor continue to be available. For monomer samples and literature, write to Dept. SP-29
ROHIVI HA&AS P H I L A D E L P H I A
5,
PA.
r~^\
m
