Patents by Inventor Nancy R. Knight

Nancy R. Knight 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).

  • Blends of copolymers of monovinylarenes and conjugated dienes containing two interior tapered blocks
    Patent number: 5587425
    Abstract: A method for preparing blends of a copolymer in a polymerization process by sequentially charging: (1) an initiator and monovinylaromatic monomer in the presence of a randomizer; (2) an initiator and monovinylaromatic monomer; (3) a mixture of monovinylaromatic and conjugated diene monomers; (4) a mixture of monovinylaromatic and conjuated diene monomers; (5) conjugated diene monomer; and (6) a coupling agent; and the polymodal tapered block copolymers prepared thereby. The copolymers are particularly useful neat or in blends for applications such as packaging and food or drink containers which require transparency and good environmental stress crack resistance.
    Type: Grant
    Filed: December 28, 1995
    Date of Patent: December 24, 1996
    Assignee: Phillips Petroleum Company
    Inventors: George A. Moczygemba, Nancy R. Knight, William J. Trepka, Nathan E. Stacy
  • Block copolymers of monovinylarenes and conjugated dienes containing two interior tapered blocks
    Patent number: 5399628
    Abstract: A method for preparing tapered block copolymers in a polymerization process by sequentially charging: (1) an initiator and monovinylaromatic monomer in the presence of a randomizer; (2) an initiator and monovinylaromatic monomer; (3) a mixture of monovinylaromatic and conjugated diene monomers; (4) a mixture of monovinylaromatic and conjugated diene monomers; (5) conjugated diene monomer; and (6) a coupling agent; and the polymodal tapered block copolymers prepared thereby. The copolymers are particularly useful neat or in blends for applications such as packaging and food or drink containers which require transparency and good environmental stress crack resistance.
    Type: Grant
    Filed: December 2, 1993
    Date of Patent: March 21, 1995
    Assignee: Phillips Petroleum Company
    Inventors: George A. Moczygemba, Nancy R. Knight, William J. Trepka, Nathan E. Stacy
  • Conjugated diene/monovinylarene block copolymers with multiple tapered blocks
    Patent number: 5393838
    Abstract: A method for preparing polymodal tapered block copolymers in a polymerization process by sequentially charging: (a) an initiator and monovinylaromatic monomers in the presence of a randomizer; (b) an initiator and monovinylaromatic monomers; (c) a mixture of monovinylaromatic and conjugated diene monomers; (d) a mixture of monovinylaromatic and conjugated diene monomers; (e) an initiator and monovinylaromatic monomers; (f) a mixture of monovinylaromatic and conjugated diene monomers; (g) a mixture of monovinylaromatic and conjugated diene monomers; (h) conjugated diene monomers; and (i) a coupling agent. The copolymers and blends thereof are particularly useful for packaging applications which require good environmental stress crack resistance.
    Type: Grant
    Filed: December 6, 1993
    Date of Patent: February 28, 1995
    Assignee: Phillips Petroleum Company
    Inventors: George A. Moczygemba, Nathan E. Stacy, Nancy R. Knight
  • Conjugated diene/monovinylarene block copolymers with multiple tapered blocks
    Patent number: 5290875
    Abstract: A method for preparing polymodal tapered block copolymers in a polymerization process by sequentially charging: (a) an initiator and monovinylaromatic monomers in the presence of a randomizer; (b) an initiator and monovinylaromatic monomers; (c) a mixture of monovinylaromatic and conjugated diene monomers; (d) a mixture of monovinylaromatic and conjugated diene monomers; (e) an initiator and monovinylaromatic monomers; (f) a mixture of monovinylaromatic and conjugated diene monomers; (g) a mixture of monovinylaromatic and conjugated diene monomers; (h) conjugated diene monomers; and (i) a coupling agent. The copolymers are particularly useful for packaging applications which require good environmental stress crack resistance.
    Type: Grant
    Filed: November 30, 1992
    Date of Patent: March 1, 1994
    Assignee: Phillips Petroleum Company
    Inventors: George A. Moczygemba, Nathan E. Stacy, Nancy R. Knight