Patents Represented by Attorney, Agent or Law Firm Anthony A. Bisolca
  • Polyolefin articles with long-term elevated temperature stability
    Patent number: 6774170
    Abstract: A heat stabilizing composition for polyolefins comprises an oxidized, non-cationized, non-silylated sulfur black pigment, a hindered phenolic antioxidant a sulfur-containing secondary stabilizer, each in stabilizing amount, and a hindered amine. The heat stabilizing composition yields polyolefin compounds and articles having improved long term heat aging stability. Preferably, the sulfur black pigment is treated by washing, to thereby reduce the concentration of soluble sodium salts.
    Type: Grant
    Filed: December 7, 2001
    Date of Patent: August 10, 2004
    Assignee: Clariant Finance (BVI) Limited
    Inventor: Joseph R. Webster