Back to results
US 4,418,231 AGranted
Corrosion inhibited solvent compositions
AssigneePPG Industries, Inc.
InventorSteven E. Pamer
Life of this patent
Estimating the term…
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
Solvent composition comprising:
- a. a member selected from the group consisting of methylchloroform, trichloroethylene and a mixture thereof;
- and
- b. a corrosion inhibiting amount of acid acceptor 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.
Dependencies are inferred from the claim text.