Hetero Ring Containing Plural Ring Oxygens Patents (Class 570/115)
  • Corrosion inhibited solvent compositions
    Patent number: 4418231
    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.
    Type: Grant
    Filed: August 7, 1981
    Date of Patent: November 29, 1983
    Assignee: PPG Industries, Inc.
    Inventor: Steven E. Pamer
  • Stabilized methylchloroform composition
    Patent number: 4394284
    Abstract: A nitroalkane-free inhibitor system for methylchloroform has been formulated which contains dioxane, an alkylene oxide, and 3-butyn-1-ol. The stabilizer amounts to about 4 to 6% by volume of the stabilized methylchloroform composition. The stabilized composition is useful in vapor degreasing applications when it additionally contains an alkyl nitrate.
    Type: Grant
    Filed: August 2, 1982
    Date of Patent: July 19, 1983
    Assignee: The Dow Chemical Company
    Inventor: Alvetta Pryor
  • Cyclopropane ring-containing compounds as inhibitor components in methylchloroform
    Patent number: 4327232
    Abstract: A stabilized methylchloroform solvent useful in degreasing operations in which the alkylene oxide stabilizer component normally employed is replaced by a tricyclic or quadricyclic compound containing a fused cyclopropane ring.
    Type: Grant
    Filed: February 19, 1981
    Date of Patent: April 27, 1982
    Assignee: The Dow Chemical Company
    Inventors: Alvetta Pryor, Nobuyuki Ishibe