Patents Assigned to Aristech Chemical Corp
  • Method of making teritiary hindered amines
    Patent number: 5856491
    Abstract: Fully hindered secondary amines, typically tetramethyl piperidine, are reacted with terminally unsaturated electrophilic compounds having at least five carbon atoms to obtain tertiary hindered amines. The reaction is conducted with an excess of secondary amine, preferably in the presence of a specified solvent such as N-methyl pyrrolidinone.
    Type: Grant
    Filed: August 9, 1997
    Date of Patent: January 5, 1999
    Assignee: Aristech Chemical Corp.
    Inventor: Mark R. Rubino
  • Hindered amine light stabilizer
    Patent number: 5688951
    Abstract: New N-substituted piperidines useful as light stabilizers in synthetic resins are disclosed. They are 1-(2,7-octadienyl)-2,2,6,6-tetraalkylpiperidines wherein the alkyl groups are independently selected lower alkyl groups such as methyl or ethyl and the 3 and 5 positions may be substituted by methyls. The ring may be monounsaturated; a new compound 1-(2,7-octadienyl)-2, 2,6,6-tetramethyl-3-pyridine is described.
    Type: Grant
    Filed: March 11, 1996
    Date of Patent: November 18, 1997
    Assignee: Aristech Chemical Corp
    Inventor: Mark R. Rubino