Patents by Inventor Charles R. Kutal

Charles R. Kutal 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).

  • Anionic and Lewis base photopolymerization process and its use for making optical articles
    Patent number: 7253213
    Abstract: The invention relates to a process for polymerising a monomer, polymerizing and/or crosslinking an oligomer, or crosslinking a polymer or copolymer, said monomer, oligomer, polymer and copolymer being selected among precursor monomers, urethane, thiourethane and episulfide oligomers, and urethane, thiourethane and episulfide polymers and copolymers, which comprises: (a) adding to precursor monomers or oligomers or polymers or copolymers an effective amount of at least one complex of Co, Mo or W which under irradiation conditions photochemically reacts to release at least one anionically charged nucleophile or uncharged Lewis base; and (b) irradiating the mixture of (a) to release the at least one anionically charged nucleophile or uncharged Lewis base to initiate polymerisation and/or crosslinking of the monomer, oligomer, polymer or copolymer.
    Type: Grant
    Filed: April 26, 2005
    Date of Patent: August 7, 2007
    Inventors: Charles R. Kutal, Sirisoma Wanigatunga, Gabriel Keita, Yassin Turshani
  • Anionic and Lewis base photopolymerization process and its use for making optical articles
    Patent number: 6911485
    Abstract: The invention relates to a process for polymerising a monomer, polymerizing and/or crosslinking a oligomer, or crosslinking a polymer or copolymer, said monomer, oligomer, polymer and copolymer being selected among precursor monomers, urethane, thiourethane and episulfide oligomers, and urethane, thiourethane and episulfide polymers and copolymers, which comprises: (a) adding to precursor monomers or oligomers or polymers or copolymers an effective amount of at least one complex of Co, Mo or W which under irradiation conditions photochemically reacts to release at least one anionically charged nucleophile or uncharged Lewis base; and (b) irridiating the mixture of (a) to release the at least one anionically charged nucleophile or uncharged Lewis base to initiate polymerisation and/or crosslinking of the monomer, oligomer, polymer or copolymer.
    Type: Grant
    Filed: April 19, 2002
    Date of Patent: June 28, 2005
    Assignees: The University of Georgia Research Foundation, Inc., Essilor International Campagnie Generale D'Optique
    Inventors: Charles R. Kutal, Sirisoma Wanigatunga, Gabriel Keita, Yassin Turshani
  • Substituted benzoylferrocene anionic photoinitiators
    Patent number: 6127445
    Abstract: The present invention relates to anionic photoinitiator compounds, compositions containing them, and methods of using them having the structure: ##STR1## wherein X and Y are independently selected from the group consisting of a direct single bond and --C(.dbd.O)--, wherein at least one of X and Y is --C(.dbd.O)--;R.sup.1 and R.sup.2 are independently selected from the group consisting of H and substituted phenyl, wherein both R.sup.1 and R.sup.2 are not H;and wherein neither --X--R.sup.1 nor --Y--R.sup.2 is --C(.dbd.O)H. The anionic photoinitiators have improved storage stability, without loss of photosensitivity, even when stored with polymerizable or crosslinkable monomer, oligomer, or crosslinkable polymer species.
    Type: Grant
    Filed: November 3, 1998
    Date of Patent: October 3, 2000
    Assignee: The University of Georgia Research Foundation, Inc.
    Inventors: Charles R. Kutal, Yoshikazu Yamaguchi
  • Anionic photoinitiation
    Patent number: 5877230
    Abstract: A method for the anionic photoinitiation of polymerization or crosslinking of a substrate by irradiating a mixture of a substrate and a photoinitiator, where the photoinitiator is an inorganic transition metal complex which releases on irradiation a polymerization initiating substance consisting essentially of an anionically charged nucleophile that initiates the polymerization or crosslinking reaction, under conditions that allow the anion to initiate polymerization. FIG. 3 is plot of percentage polymerization of ethyl .alpha.-cyanoacrylate containing different concentration of Reineckate's anion.
    Type: Grant
    Filed: July 25, 1997
    Date of Patent: March 2, 1999
    Assignees: University of Georgia Research Foundation, Inc., The University of Georgia
    Inventor: Charles R. Kutal
  • Anionic photoinitiation
    Patent number: 5691113
    Abstract: A method for the anionic photoinitiation of a substrate that includes exposing the substrate to an inorganic complex that releases an anionically charged nucleophile on irradiation.
    Type: Grant
    Filed: October 18, 1994
    Date of Patent: November 25, 1997
    Assignee: The University of Georgia Research Foundation, Inc.
    Inventor: Charles R. Kutal
  • Anionic photoinitiation
    Patent number: 5652280
    Abstract: A method for the anionic photoinitiation of polymerization or crosslinking of a substrate by irradiating a mixture of a substrate and a photoinitiator, where the photoinitiator is an inorganic transition metal complex which releases on irradiation a polymerization initiating substance consisting essentially of an anionically charged nucleophile that initiates the polymerization or crosslinking reaction, under conditions that allow the anion to initiate polymerization.
    Type: Grant
    Filed: May 17, 1994
    Date of Patent: July 29, 1997
    Assignee: University of Georgia Research Foundation, Inc.
    Inventor: Charles R. Kutal