Patents by Inventor Ezio Rizzardo
Ezio Rizzardo 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).
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Publication number: 20070232783Abstract: The present invention is directed to a process for the cleavage of one or more starting polymers having thiocarbonylthio groups of the formula —S—(C?S)— into derived polymers having thiol end groups of the formula —SH. The process includes contacting the aforedescribed starting polymers, with a reagent having the formula Xa Yb, wherein Xa is a nucleophilic group and Yb is an extracting group that results in the starting polymer and a byproduct, which is then separated from the derived polymer by conventional separation processes. The derived polymer is free from any odor or color that is sometimes associated with the starting polymer and it can be used in making optical lenses, such as contact lenses.Type: ApplicationFiled: February 23, 2007Publication date: October 4, 2007Inventors: Graeme Moad, Ezio Rizzardo, San Thang
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Publication number: 20070225447Abstract: This invention provides a method for removing certain sulfur-containing groups from polymers, especially those made via RAFT polymerization processes.Type: ApplicationFiled: May 11, 2005Publication date: September 27, 2007Inventors: William Farnham, Graeme Moad, San Hoa Thang, Ezio Rizzardo, Michael Fryd
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Patent number: 7250479Abstract: This invention concerns a free radical polymerization process, selected chain transfer agents employed in the process and polymers made thereby, in which the process comprises preparing polymer of general Formula (A) and Formula (B) comprising contacting: (i) a monomer selected from the group consisting of vinyl monomers (of structure CH2?CUV), maleic anhydride, N-alkylmaleimide, N-arylmaleimide, dialkyl fumarate and cyclopolymerizable monomers; (ii) a thiocarbonylthio compound selected from Formula (C) and Formula (D) having a chain transfer constant greater than about 0.Type: GrantFiled: February 23, 2004Date of Patent: July 31, 2007Assignees: E. I. du Pont de Nemours and Company, Commonwealth Scientific and Industrial Research OrganizationInventors: Tam Phuong Le, Graeme Moad, Ezio Rizzardo, San Hoa Thang
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Patent number: 7148297Abstract: This invention relates to a process for controlling the architecture of copolymers of at least two unsaturated monomers, made by free-radical polymerization in the presence of a cobalt-containing chain transfer agent, including the control of molecular weight, degree of branching and vinyl end group termination, by varying at least one of the variables of molar ratio of monomers, their relative chain transfer constants, polymerization temperature and degree of conversion and amount of cobalt chain transfer agent; and polymers made thereby.Type: GrantFiled: January 24, 2003Date of Patent: December 12, 2006Assignees: E. I. du Pont de Nemours and Company, Commonwealth Scientific and Industrial Research OrganisationInventors: Graeme Moad, Ezio Rizzardo, Catherine Moad, Steven Dale Ittel, Lech Wilczek, Alexei A Gridnev
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Patent number: 7144963Abstract: This invention relates to a process for controlling the architecture of copolymers of at least two unsaturated monomers, made by free-radical polymerization in the presence of a cobalt-containing chain transfer agent, including the control of molecular weight, degree of branching and vinyl end group termination, by varying at least one of the variables of molar ratio of monomers, their relative chain transfer constants, polymerization temperature and degree of conversion and amount of cobalt chain transfer agent; and polymers made thereby.Type: GrantFiled: August 13, 2004Date of Patent: December 5, 2006Assignees: E.I. du Pont de Nemours and Company, The Commonwealth of Australia Commonwealth Scientific and Industrial Research OrganisationInventors: Graeme Moad, Ezio Rizzardo, Catherine Louise Moad, Steven Dale Ittel, Lech Wilczek, Alexi A. Gridnev
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Publication number: 20060235127Abstract: The instant invention discloses a composition, preferably a nanocomposite material, comprising (a) a synthetic polymer, (b) a filler such as for example a natural or synthetic phyllosilicate or a mixture of such phyllosilicates, preferably in nanoparticles, and (c) as dispersing agent a polymer based on a long chain alkyl meth(acryte).Type: ApplicationFiled: June 14, 2004Publication date: October 19, 2006Inventors: Graeme Moad, George Simon, Katherine Dean, Guoxin Li, Roshan Mayadunne, Ezio Rizzardo, Richard Evans, Hendrik Wermter, Rudolf Pfaendner
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Publication number: 20060223936Abstract: The invention provides a method for preparing an aqueous dispersion of polymer particles comprising the following steps: (i) preparing a dispersion having a continuous aqueous phase, a dispersed organic phase comprising one or more ethylenically unsaturated monomers, and an amphiphilic RAFT agent as a stabiliser for said organic phase, and (ii) polymerising said one or more ethylenically unsaturated monomers under the control of said amphiphilic RAFT agent to form said aqueous dispersion of polymer particles, novel amphiphilic RAFT agents for use in this method, novel RAFT agents useful in making these amphiphilic RAFT agents and methods for their manufacture.Type: ApplicationFiled: December 20, 2002Publication date: October 5, 2006Inventors: Christopher Such, Ezio Rizzardo, Algirdas Serelis, Brian Hawkett, Robert Gilbert, Christopher Ferguson, Robert Hughes, Edna Olejnik
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Patent number: 7109282Abstract: This invention relates to a process for controlling the architecture of copolymers of at least two unsaturated monomers, made by free-radical polymerization in the presence of a cobalt-containing chain transfer agent, including the control of molecular weight, degree of branching and vinyl end group termination, by varying at least one of the variables of molar ratio of monomers, their relative chain transfer constants, polymerization temperature and degree of conversion and amount of cobalt chain transfer agent; and polymers made thereby.Type: GrantFiled: April 18, 2003Date of Patent: September 19, 2006Assignees: E. I. du Pont de Nemours and Company, Commonwealth Scientific and Industrial Research OrganisationInventors: Graeme Moad, Ezio Rizzardo, Catherine Louise Moad, Steven Dale Ittel, Lech Wilczek, Alexei A. Gridnev
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Publication number: 20060142404Abstract: The invention provides in one aspect a process for preparing a microgel by RAFT polymerizing in the presence of a RAFT chain transfer agent, one or more solvophobic monomers and one or more solvophilic monomers to form one or more block copolymers comprising one or more solvophobic blocks and one or more solvophilic blocks wherein the solvophobic block is insoluble in a dispersing medium and the solvophilic block is soluble in the dispersing medium. The block copolymer is dispersed in the dispersing medium to form micelles, which is then stabilized to form the microgel. The dispersing medium can be aqueous or lipophilic. The method of the present invention also permits one to encapsulate a wide variety of materials, such as pigments, dye molecules, and aluminum flakes used in metallized paints.Type: ApplicationFiled: April 6, 2001Publication date: June 29, 2006Inventors: Charles Berge, John Chiefari, Jeffery Johnson, Albert Mau, Roshan Mayadunne, Catherine Moad, Graeme Moad, Ezio Rizzardo, Gerry Swiegers, San Thang, Gerry Wilson
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Patent number: 7064151Abstract: The invention provides in one aspect a process for preparing a microgel by RAFT polymerizing in the presence of a RAFT chain transfer agent, one or more solvophobic monomers and one or more solvophilic monomers to form one or more block copolymers comprising one or more solvophobic blocks and one or more solvophilic blocks wherein the solvophobic block is insoluble in a dispersing medium and the solvophilic block is soluble in the dispersing medium. The block copolymer is dispersed in the dispersing medium to form micelles, which is then stabilized to form the microgel. The dispersing medium can be aqueous or lipophilic. The method of the present invention also permits one to encapsulate a wide variety of materials, such as pigments, dye molecules, and aluminum flakes used in metallized paints.Type: GrantFiled: April 6, 2001Date of Patent: June 20, 2006Assignees: E. I. du Pont de Nemours and Company, Commonwealth Scientific and Industrial Research OrganisationInventors: Charles T. Berge, John Chiefari, Jeffery W. Johnson, Albert Mau, Roshan Mayadunne, Catherine Louise Moad, Graeme Moad, Ezio Rizzardo, Gerry Swiegers, San Thang, Gerry Wilson
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Publication number: 20050014911Abstract: This invention relates to a process for controlling the architecture of copolymers of at least two unsaturated monomers, made by free radical polymerization in the presence of a cobalt-containing chain transfer agent, including the control of molecular weight degree of branching and vinyl end group termination, by varying at least one of the variables of molar ratio of monomers, their relative chain transfer constants, polymerization temperature and degree of conversion and amount of cobalt chain transfer agent; and polymers made thereby.Type: ApplicationFiled: August 13, 2004Publication date: January 20, 2005Inventors: Graeme Moad, Ezio Rizzardo, Catherine Moad, Steven Ittel, Lech Wilczek, Alexei Gridnev
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Patent number: 6822056Abstract: A process for preparing microgel(s) that uses a wide range of activatable prepolymers; in the process, a polymer composition of crosslinked component A and soluble components B and C is formed from mono-olefinic and multi-olefinic monomers in the presence of catalyst and initiator; the process comprises: I) introducing mono-olefinic monomer, catalyst, and initiator into a reactor in the absence of multi-olefinic monomer and producing an activatable prepolymer, component B; II) contacting the product of I) with multi-olefinic monomer to produce components A and C, optionally in the presence of additional initiator; also optionally in the presence of additional mono-olefinic monomer and initiator; the ratio of components A/(B+C) can be controlled by varying the mole ratio of Component B/multi-olefinic monomer from 0.05/1 up to 5/1, by decreasing the mole ratio to increase the ratio of A/(B+C), and increasing the mole ratio to decrease the ratio of A/(B+C).Type: GrantFiled: October 3, 2001Date of Patent: November 23, 2004Assignees: E. I. du Pont de Nemours and Company, Commonwealth Scientific and Industrial OrganizationInventors: Charles T. Berge, Michael Fryd, Jeffrey W. Johnson, Graeme Moad, Ezio Rizzardo, Christopher Scopazzi, San Hoa Thang
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Publication number: 20040171777Abstract: This invention concerns a free radical polymerization process, selected chain transfer agents employed in the process and polymers made thereby, in which the process comprises preparing polymer of general Formula (A) and Formula (B) comprising contacting: (i) a monomer selected from the group consisting of vinyl monomers (of structure CH2═CUV), maleic anhydride, N-alkylmaleimide, N-arylmaleimide, dialkyl fumarate and cyclopolymerizable monomers; (ii) a thiocarbonylthio compound selected from Formula (C) and Formula (D) having a chain transfer constant greater than about 0.1; and (iii) free radicals produced from a free radical source; the polymer of Formula (A) being made by contacting (i), (ii) C and (iii) and that of Formula (B) by contacting (i), (ii) D, and (iii); and (iv) controlling the polydispersity of the polymer being formed by varying the ratio of the number of molecules of (ii) to the number of molecules of (iii); wherein Q, R, U, V, Z, Z′, m, p and q are as defined in the text.Type: ApplicationFiled: February 23, 2004Publication date: September 2, 2004Inventors: Tam Phuong Le, Graeme Moad, Ezio Rizzardo, San Hoa Thang
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Patent number: 6747111Abstract: A free radical polymerization process suitable for synthesizingpolymers is disclosed. The process utilizes novel sulfur based chain transfer agents and is widely compatible over a range of monomers and reaction conditions. Novel polymers having low pollydispersity and predictable specific polymer architecture and molecular weight are produced by the process. The polymers produced by the process are suitable for use as binders in automotive OEM and refinish coatings.Type: GrantFiled: July 18, 2003Date of Patent: June 8, 2004Assignees: E. I. du Pont de Nemours and Company, Commonwealth Scientific and Industrial Research OrganizationInventors: John Chiefari, Roshan Tyrrel Mayadunne, Graeme Moad, Ezio Rizzardo, San Hoa Thang
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Publication number: 20040024132Abstract: A free radical polymerization process suitable for synthesizingpolymers is disclosed. The process utilizes novel sulfur based chain transfer agents and is widely compatible over a range of monomers and reaction conditions. Novel polymers having low polydispersity and predictable specific polymer architecture amd molecular weight are produced by the process. The polymers produced by the process are suitable for use as binders in automotive OEM and refinish coatings.Type: ApplicationFiled: July 18, 2003Publication date: February 5, 2004Inventors: John Chiefari, Roshan Tyrrel Mayadunne, Graeme Moad, Ezio Rizzardo, San Hoa Thang
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Patent number: 6653407Abstract: The present invention is directed to a process for forming star shaped microgels which include a core of crosslinked polymer and multiplicity of substantially linear polymeric arms of macromonomers attached to the core. The process includes polymerizing monoethylenically unsaturated monomers in the presence of a chain transfer agent to form macromonomers each having a terminal polymerizable ethylenically unsaturated group and then polymerizing, in presence of the macromonomers, the monoethylenically unsaturated monomers and multi-olefinic crosslinking monomers. The microgels of the present invention can be used as rheology control agents in waterborne and solvent-borne coatings and in adhesives and cosmetics.Type: GrantFiled: October 3, 2001Date of Patent: November 25, 2003Assignees: E. I. du Pont de Nemours and Company, Commonwealth Scientific and Industrial Research Organization, University of MelburneInventors: Charles T. Berge, Michael Fryd, Jeffrey W. Johnson, Graeme Moad, Ezio Rizzardo, Christopher Scopazzi, San Hoa Thang
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Publication number: 20030212218Abstract: This invention relates to a process for controlling the architecture of copolymers of at least two unsaturated monomers, made by free-radical polymerization in the presence of a cobalt-containing chain transfer agent, including the control of molecular weight, degree of branching and vinyl end group termination, by varying at least one of the variables of molar ratio of monomers, their relative chain transfer constants, polymerization temperature and degree of conversion and amount of cobalt chain transfer agent; and polymers made thereby.Type: ApplicationFiled: April 18, 2003Publication date: November 13, 2003Inventors: Graeme Moad, Ezio Rizzardo, Catherin Louise Moad, Steven Dale Ittel, Lech Wilczek, Alexei A. Gridnev
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Patent number: 6646055Abstract: A process for preparing microgel(s) that uses a wide range of activatable prepolymers. In the process, a polymer composition of crosslinked component A and soluble components B and C is formed from mono-olefinic and multi-olefinic monomers in the presence of catalyst and initiator. The process comprises: I) introducing mono-olefinic monomer, catalyst, and initiator into a reactor in the absence of multi-olefinic monomer and producing an activatable prepolymer, component B; II) contacting the product of I) with multi-olefinic monomer to produce components A and C, optionally in the presence of additional initiator; also optionally in the presence of additional mono-olefinic monomer and initiator. The ratio of components A/(B+C) can be controlled by varying the mole ratio of The Component B/multi-olefinic monomer from 0.05/1 up to 5/1, by decreasing the mole ratio to increase the ratio of A/(B+C), and increasing the mole ratio to decrease the ratio of A/(B+C).Type: GrantFiled: October 3, 2001Date of Patent: November 11, 2003Assignees: E. I. du Pont de Nemours and Company, Commonwealth Scientific and Industrial Research Organization, University of MelburneInventors: Charles T. Berge, Michael Fryd, Jeffrey W. Johnson, Graeme Moad, Ezio Rizzardo, Christopher Scopazzi, San Hoa Thang
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Patent number: 6642318Abstract: A free radical polymerization process suitable for synthesizing polymers is disclosed. The process utilizes novel sulfur based chain transfer agents and is widely compatible over a range of monomers and reaction conditions. Novel polymers having low polydispersity and predictably specific polymer architecture and molecular weight are produced by the process. The polymers produced by the process are suitable for use as binders in automotive OEM and refinish coatings.Type: GrantFiled: June 16, 2000Date of Patent: November 4, 2003Assignees: E. I. du Pont de Nemours and Company, Commonwealth Scientific and Industrial Research OrganizationInventors: John Chiefari, Roshan Tyrrel Mayadunne, Graeme Moad, Ezio Rizzardo, San Hoa Thang
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Publication number: 20030195313Abstract: This invention relates to a process for controlling the architecture of copolymers of at least two unsaturated monomers, made by free-radical polymerization in the presence of a cobalt-containing chain transfer agent, including the control of molecular weight, degree of branching and vinyl end group termination, by varying at least one of the variables of molar ratio of monomers, their relative chain transfer constants, polymerization temperature and degree of conversion and amount of cobalt chain transfer agent, and polymers made thereby.Type: ApplicationFiled: January 24, 2003Publication date: October 16, 2003Inventors: Graeme Moad, Ezio Rizzardo, Catherine Louise Moad, Steven Dale Ittel, Lech Wilczek, Alexei A. Gridnev