Patents by Inventor Alison Ciupa

Alison Ciupa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Mixed phosphinimine catalyst
    Patent number: 6486273
    Abstract: A supported catalyst for the polymerization of olefins, especially ethylene, has at least two catalyst components having different propagation and/or termination constants. Each catalyst component must have at least one phosphinimine ligand. The polymer produced according to this invention has a broad molecular weight distribution. Catalysts according to this invention have a very surprising and desirable hydrogen response.
    Type: Grant
    Filed: April 16, 2001
    Date of Patent: November 26, 2002
    Assignee: Nova Chemicals (International) S.A
    Inventors: Ian McKay, Alison Ciupa, Barbara Christine Hall
  • Mixed phosphinimine catalyst
    Patent number: 6235672
    Abstract: A supported catalyst for the polymerization of olefins, especially ethylene, has at least two catalyst components having different propagation and/or termination constants. Each catalyst component must have at least one phosphinimine ligand. The polymer produced according to this invention has a broad molecular weight distribution. Catalysts according to this invention have a very surprising and desirable hydrogen response.
    Type: Grant
    Filed: July 14, 2000
    Date of Patent: May 22, 2001
    Assignee: Nova Chemicals (International) S.A.
    Inventors: Ian McKay, Alison Ciupa, Barbara Christine Hall
  • Heterogeneous metallocene catalyst
    Patent number: 6235671
    Abstract: A heterogeneous catalyst for olefin polymerization is prepared by spray drying a mixture of a metallocene catalyst, a cocatalyst and a hydrotalcite. It Preferred hydrotalcites are magnesium-aluminum hydroxy carbonates. The catalysts are very active for ethylene polymerization. The hydrotalcite used in this invention are generally defined by the formula: (Mg1−x Alx(OH)2)n+An−x/n·m H2O wherein X is from 0 to 0.5, m is from 0 to 20 and An− is an anion having a charge of n. Preferred hydrotalcites are those in which the anion A is a carbonate and which have been dried of adsorbed water.
    Type: Grant
    Filed: April 14, 1999
    Date of Patent: May 22, 2001
    Assignee: Nova Chemicals (International) S.A.
    Inventors: Ian McKay, Alison Ciupa, P. Scott Chisholm
  • Phosphorus based catalysts for the polymerization of olefins
    Patent number: 6013745
    Abstract: The present invention relates to the polymerization of one or more alpha olefins in the presence of a transition metal catalyst having either a heterobifunctional ligand, having a phosphorus and a nitrogen atom, or a bis-phosphinimine ligand having two nitrogen atoms, in the presence of an activator.
    Type: Grant
    Filed: August 4, 1997
    Date of Patent: January 11, 2000
    Assignee: The Governors of the University of Alberta
    Inventors: Ian McKay, Alison Ciupa, Arpad F. Somogyvari, Beth Lorraine Creed, Alan Rodney Sanger, David John Law, Ronald George Cavell