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US 4,466,903 AGranted
Unsaturated 1,3-dioxolane stabilized with aliphatic aldehyde hydrazone
AssigneePPG Industries, Inc.
InventorSteven E. Pamer
Life of this patent
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Abstract
2-Alkylidene-1,3-dioxolanes and 2-(1-alkylalkylidene)-1,3-dioxolanes are employed as acid acceptors in methylchloroform, trichloroethylene or mixtures thereof. The preferred acid acceptor is 2-methylene-1,3-dioxolane. In another aspect of the invention, aliphatic aldehyde hydrazone is employed to stabilize 2-alkylidene-1,3-dioxolane and 2-(1-alkylalkylidene)-1,3-dioxolane. The preferred aliphatic aldehyde hydrazone is acetaldehyde dimethylhydrazone.
Claims11
A composition comprising:
- a. unsaturated 1,3-dioxolane represented by the structural formula ##STR7## wherein R.sub.1 and R.sub.2 are each independently hydrogen, methyl or ethyl and wherein R.sub.3 and R.sub.4 are each independently hydrogen or alkyl containing from 1 to about 6 carbon atoms;
- and
- b. a stabilizing amount of aliphatic aldehyde hydrazone represented by the formula ##STR8## wherein R.sub.5, R.sub.6 and R.sub.7 are each independently hydrogen or an aliphatic group of from 1 to about 4 carbon atoms with the proviso that said aliphatic aldehyde hydrazone has from 1 to about 7 carbon atoms.
Dependencies are inferred from the claim text.