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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Patent number: 5874511Abstract: A process for the production of polymers by free radical polymerization, characterized in that there is added to the polymerization system one or more compounds of the general formula (A). ##STR1## where R.sup.1 is hydrogen or a group capable of activating the vinylic carbon towards free radical addition;Y is OR.sup.2 or CH.sub.2 X(R.sup.2).sub.nwhere R.sup.2 is an optionally substituted alkyl, optionally substituted alkenyl, optionally substituted alkynyl, or optionally substituted saturated, unsaturated or aromatic carbocyclic or heterocyclic ring;X is an element other than carbon selected from Groups IV, V, VI or VII of the Periodic Table or a group consisting of an element selected from Groups IV, V, or VI to which is attached one or more oxygen atoms; andn is a number from 0 to 3, such that the valency of the group X is satisfied and, when n is greater than 1, the groups represented by R.sup.2 may be identical or different.Type: GrantFiled: June 24, 1996Date of Patent: February 23, 1999Assignees: E. I. du Pont de Nemours and Company, Commonwealth Scientific and Industrial Research OrganisationInventors: Ezio Rizzardo, Gordon Francis Meijs, San Hoa Thang
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Patent number: 5830966Abstract: Compounds of general formula (I) ##STR1## characterised in that R.sup.1 and R.sup.2 are independently selected from the group consisting of COOR, CN, aryl, substituted aryl, COOH, halogen, C(O)NHR.sup.4, C(O)NR.sup.5 R.sup.6 ;X and Y are independently selected from the group consisting of H, COOH, COOR, CN, R.sup.3 CO--, C(O)NHR.sup.4, C(O)NR.sup.5 R.sup.6, P(O)(OR.sup.7).sub.2 and SO.sub.2 R.sup.8 ; with the proviso that X and Y are not both H; or X and Y together with the carbon atom to which they are attached form a carbocyclic or heterocyclic ring system which can contain oxygen, sulfur or nitrogen atoms; and R, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7 and R.sup.8 are various groups;and polymers and copolymers derived from such compounds.Type: GrantFiled: January 26, 1996Date of Patent: November 3, 1998Assignees: E. I. du Pont de Nemours and Company, Commonwealth Scientific & Industrial Research OrganisationInventors: San Hoa Thang, Ezio Rizzardo, Graeme Moad
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Patent number: 5773543Abstract: A process for the free radical initiated polymerization of unsaturated species characterized by the use of compound of Formula (I) as chain transfer agents: ##STR1## wherein: X is selected from hydrogen; CN; optionally substituted aryl; COOH; COOR; C(O)NHR.sup.6 ; C(O)NR.sup.7 R.sup.8 ; and halogen;Q is selected from COOR.sup.1 ; CN; and C(O)NR.sup.7 R.sup.8 ;Y is selected from hydrogen; C.sub.1 to C.sub.6 alkyl; C.sub.1 to C.sub.6 alkyl substituted with one or more substituents selected from hydroxy, amino, C.sub.1 to C.sub.6 alkoxy, C.sub.1 to C.sub.6 alkoxycarbonyl, halogen, CN and optionally substituted aryl; C.sub.1 to C.sub.6 alkenyl; and C.sub.1 to C.sub.6 alkynyl;Z is selected from COOR.sup.2 ; CN; and optionally substituted aryl;R.sup.3 and R.sup.4 are the same or different and are selected from hydrogen C.sub.1 to C.sub.4 alkyl and halogen; or R.sup.3 and R.sup.Type: GrantFiled: August 1, 1996Date of Patent: June 30, 1998Assignee: Commonwealth Scientific and Industrial Research OrganisationInventors: Ezio Rizzardo, San Hoa Thang, Graeme Moad, Charles Thomas Berge
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Patent number: 5756605Abstract: A method for the solution or amulsion polymerization of ethylenically unsaturated monomers, styrene, and other free radical polymerizatable monomers in aqueous media in which a cobalt chain transfer agent is used which has both hydrolytic stability and solubility in water and in the organic phase with preferential solubility in the organic phase.Type: GrantFiled: May 5, 1997Date of Patent: May 26, 1998Assignees: E. I. du Pont de Nemours and Company, Commonwealth Scientific and IndustrialInventors: Graeme Moad, Catherine Louise Moad, Julia Krstina, Ezio Rizzardo, San Hoa Thang, Michael Fryd
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Patent number: 5739228Abstract: A process for the production of low molecular weight polymers by free radical polymerization of one or more monomers in the presence of a chain transfer agent, wherein the chain transfer agent comprises one or more compounds of the general formula I ##STR1## wherein R.sup.1 is a hydrogen atom, an alkyl group, or a group capable of activating the carbon-sulfur double bond towards free radical addition; andR.sup.2 represents an optionally substituted alkyl, optionally substituted alkenyl, optionally substituted alkynyl, or optionally substituted saturated, unsaturated or aromatic carbocyclic or heterocyclic ring.Type: GrantFiled: June 23, 1995Date of Patent: April 14, 1998Assignee: Commonwealth Scientific and Industrial Research OrganizationInventors: Gordon Francis Meijs, Ezio Rizzardo
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Patent number: 5698648Abstract: A process for the production of lower molecular weight polymers by free radical polymerization, characterized in that there is added to the polymerization system a compound of the general formula I ##STR1## wherein R.sup.1 is hydrogen, chlorine, an alkyl group, or a group capable of activating the vinylic carbon towards free radical addition;R.sup.2 is hydrogen or an optionally substituted alkyl, alkenyl, aryl, cycloalkenyl or cycloalkyl group or the group --COZ, where Z is R.sup.3 or OR.sup.3, where R.sup.3 is hydrogen or an optionally substituted alkyl, alkenyl or aryl group.X is a hydrogen atom, an alkyl or aryl group, or a halogen, and the two X groups may be the same or different.The invention also includes polymers or oligomers made by the process and novel compounds of the general formula I as defined above.Type: GrantFiled: February 28, 1994Date of Patent: December 16, 1997Assignee: The Commonwealth of Australia Commonwealth Scientific and Industrial Research OrganisationInventors: Ezio Rizzardo, Gordon Francis Meijs, San Hoa Thang
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Patent number: 5665839Abstract: Compound of the Formula 1 ##STR1## wherein: R.sup.1 and R.sup.2 are independently selected from the group comprising hydrogen, C.sub.1 to C.sub.6alkyl, C.sub.1 to C.sub.6 haloalkyl, phenyl, and substituted phenyl;X is selected from the group comprising sulfur, sulphone, disulfide;Y is selected from oxygen, carbon, N--H, N-alkyl, N-aryl, or sulfur; andZ is any linking functionality.The compounds represent a new class of ring opening monomers.Type: GrantFiled: July 20, 1995Date of Patent: September 9, 1997Assignee: Commonwealth Scientific and Industrial Research OrganisationInventors: Ezio Rizzardo, Richard Alexander Evans, Graeme Moad, San Hoa Thang
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Patent number: 5571850Abstract: Aqueous dispersions which are particularly well suited for use as aqueous jet ink compositions having an aqueous carrier medium which comprises water or a mixture of water and at least one organic solvent, a particulate solid, preferably a pigment, and a cyclopolymer dispersant.Type: GrantFiled: January 25, 1996Date of Patent: November 5, 1996Assignee: E. I. Du Pont de Nemours and CompanyInventors: Sheau-Hwa Ma, San Hoa Thang, Ezio Rizzardo, Graeme Moad
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Patent number: 5472957Abstract: The invention provides novel compositions for use in pharmaceutical and veterinary medicine which contain 1.alpha.-hydroxy vitamin D compounds. Particular compositions are described which contain steroids which induce or assist in combatting osteoporosis together with 1.alpha.-hydroxy vitamin D.sub.3 or 1.alpha.,25-dihydroxy vitamin D.sub.3. Methods of treatment of diseases are also provided including many which are resistant to vitamin D.sub.3, in particular bone diseases.Type: GrantFiled: August 10, 1993Date of Patent: December 5, 1995Assignee: Research Institute for Medicine and ChemistryInventors: Robert H. Hesse, Ezio Rizzardo, Derek H. R. Barton
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Patent number: 5403912Abstract: A process for the production of poly(alkylene oxide) which includes providing a polyhydroxy compound or compounds and an acid resin catalyst or a salt thereof that has been converted to the acid form; and reacting said polyhydroxy compound or compounds in the presence of said acid resin catalyst at a temperature and under conditions to allow polymerization.Type: GrantFiled: June 21, 1993Date of Patent: April 4, 1995Assignees: Commonwealth Scientific and Industrial Research organization, Unisearch LimitedInventors: Pathiraja A. Gunatillake, Gordon F. Meijs, Ezio Rizzardo
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Patent number: 5393858Abstract: A polyurethane or polyurethane-urea elastomeric composition, characterized in that the composition is a reaction product of:(A) a soft segment macrodiol which is either:(i) a homopolymer represented by formula I,HO--[(CH.sub.2).sub.n O].sub.m --H Iwherein n represents an integer greater than 5 and less than 13, m is a number such that the number average molecular weight of the compound of formula I falls in the range from 218 to 5000 and optionally at least one hydrogen atom represented in formula I is substituted by a C.sub.1 to C.sub.3 alkyl group or a halogen atom;(ii) a copolymer containing at least 25% by mass of repeating units --(CH.sub.2).sub.n O-- wherein n is as defined in formula I above; or(iii) mixture of macrodiols comprising greater than 10% of a macrodiol as defined in formula I above;(B ) an aliphatic or aromatic diisocyanate known in the art of polyurethane manufacture; and(C) optionally a chain extender.Type: GrantFiled: February 23, 1993Date of Patent: February 28, 1995Assignees: Commonwealth Scientific and Industrial Research Organisation, Unisearch LimitedInventors: Gordon F. Meijs, Ezio Rizzardo, Arthur Brandwood, Pathiraja Gunatillake, Klaus H. Schindhelm
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Patent number: 5385996Abstract: A process for the production of polymers by free radical polymerization, characterized in that there is added to the polymerization system one or more compounds of the general formula (A). ##STR1## where R.sup.1 is hydrogen or a group capable activating the vinylic carbon towards free radical addition;Y is OR.sup.2 or CH.sub.2 X(R.sup.2).sub.nwhere R.sup.2 is an optionally substituted alkyl, optionally substituted alkenyl, optionally substituted alkynyl, or optionally substituted saturated, unsaturated or aromatic, aromatic carbocyclic or heterocyclic ring;X is an element other than carbon selected from Groups IV, V, VI or VII of the Periodic Table or a group consisting of an element selected from Groups IV, V, or VI to which is attached one or more oxygen atoms; andn is a number from 0 to 3, such that the valency of the group X is satisfied and, when n is greater than 1, the groups represented by R.sup.2 may be identical or different.Type: GrantFiled: June 7, 1993Date of Patent: January 31, 1995Assignee: Commonwealth Scientific and Industrial Research OrganisationInventors: Ezio Rizzardo, Gordon F. Meijs, San H. Thang
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Patent number: 4732943Abstract: An adhesive for attaching polymeric or polymerizable restorative materials to dentine or other tooth structure, which comprises a polymer of (a) a condensate of .epsilon.-caprolactone with one or more acrylic monomers containing hydroxy groups and (b) a polymer containing binding groups capable of binding to the dentine or other tooth structure, optionally dissolved in a suitable solvent.The adhesive may be used in adhesive compositions including polymerizable monomers, polymerization initiators or fillers.Type: GrantFiled: April 21, 1986Date of Patent: March 22, 1988Assignee: Commonwealth Scientific and Industrial Research OrganizationInventors: Derrick R. Beech, Ezio Rizzardo, Wayne D. Cook, Malcolm C. Smail
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Patent number: 4581429Abstract: The present invention relates generally to improved processes for free radical polymerization, particularly to improved processes in which it is possible to control the growth steps of the polymerization to produce relatively short chain length homopolymers and copolymers, including block and graft copolymers, and further relates to new initiators which find particular application in the improved processes. Such initiators have the general structure of Formula I ##STR1## wherein X represents a group having at least one carbon atom and is such that the free radical X.sup.. is capable of polymerizing the unsaturated monomer by free radical polymerization, and the radical functionality resides on the or one of the carbon atoms,R.sup.1, R.sup.2, R.sup.5 and R.sup.6 represent the same or different straight chain or branched substituted or unsubstituted alkyl groups of a chain length sufficient to provide steric hindrance and weakening of the O--X bond, andR.sup.3 and R.sup.Type: GrantFiled: July 11, 1984Date of Patent: April 8, 1986Assignee: Commonwealth Scientific and Industrial Research OrganizationInventors: David H. Solomon, Ezio Rizzardo, Paul Cacioli