Patents by Inventor John Christopher Padget

John Christopher Padget 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).

  • Patent number: 8173159
    Abstract: A novel microcapsule comprising an encapsulated material which is enclosed within a solid permeable shell of a polymer resin having surface modifying compounds capable of reacting with isocyanate incorporated therein is disclosed. The process for producing such microcapsules is likewise disclosed.
    Type: Grant
    Filed: June 5, 2001
    Date of Patent: May 8, 2012
    Assignee: Syngenta Limited
    Inventors: Herbert Benson Scher, Jinling Chen, Isabelle Mazeaud, David Braun Kanne, Ian Malcolm Shirley, Philip Wade, John Christopher Padget, Anne Waller
  • Patent number: 7358294
    Abstract: An aqueous coating composition comprising a crosslinkable water-dispersible polyurethane oligomer wherein said composition when drying to form a coating has an open time of at least 20 minutes, a wet-edge time of at least 10 minutes, a tack free time of <20 hours and an equilibrium viscosity of <5,000 Pa·s at a solids content when drying in the range of from 20 to 55 wt % using a shear rate in the range of from 9±0.5 to 90±5 s?1 and at 23+2° C.
    Type: Grant
    Filed: October 11, 2001
    Date of Patent: April 15, 2008
    Assignee: DSM IP Assets BV
    Inventors: Alfred Jean Paul Buckmann, Emilio Martin, Gerardus Cornelis Overbeek, Johannes Ludovicus Martinus Van Hilst, John Christopher Padget, Pablo Steenwinkel, Tom Annable, Ronald Tennebroek
  • Patent number: 7223813
    Abstract: An aqueous coating composition comprising a crosslinkable water-dispersible vinyl oligomer(s) wherein said composition when drying to form a coating has an open time of at least 20 minutes, a wet edge time of at least 10 minutes, a tack free time of ?20 hours and an equilibrium viscosity of ?5,000 Pa·s at any solids content when drying in the range of from 20 to 55 wt % using any shear rate in the range of from 9±0.5 to 90±5 s?1 and at 23±2° C.
    Type: Grant
    Filed: October 11, 2001
    Date of Patent: May 29, 2007
    Assignee: DSM IP Assets B.V.
    Inventors: Alfred Jean Paul Buckmann, Emilio Martin, Gerardus Cornelis Overbeek, John Christopher Padget, Jurgen Scheerder, Tom Annable
  • Patent number: 7022759
    Abstract: An aqueous coating composition comprising a crosslinkable water-dispersible polyester oligomer wherein said composition when drying to form a coating has the following properties: an open time of at least 20 minutes, a wet edge time of at least 10 minutes, a thumb hard time of ?48 hours and a tack-free time ?20 hours and an equilibrium viscosity of ?5000 Pa.s at any solids content when drying in the range of from 20 to 55 wt % using a shear rate in the range of from 9±0.5 to 90±5 s?1 and at 23±2° C.
    Type: Grant
    Filed: October 11, 2001
    Date of Patent: April 4, 2006
    Assignee: Avecia BV
    Inventors: Emilio Martin, Gerardus Cornelis Overbeek, John Christopher Padget, Pablo Steenwinkel, Petrus Johannes Maria Van Oorschot, Ronald Tennebroek
  • Publication number: 20040210025
    Abstract: Water-soluble films suitable for water-dissolvable packaging comprising a polyurethane polymer having defined amounts of poly(ethylene oxide) (and optionally poly(propylene oxide)) groups and acid (preferably carboxyl) groups at least 50% neutralised with a base, at least a proportion of which is of the non-volatile type, the polyurethane being made by chain extension of a urethane prepolymer. Also water-soluble packaging (sachets, capsules, bags) made from the films and their use in packaging various materials, and a process for the production of aqueous polyurethane solutions which may be used for making such films.
    Type: Application
    Filed: December 10, 2003
    Publication date: October 21, 2004
    Inventors: David Charles Hinde, Gerardus Cornelis Overbeek, John Christopher Padget, Phillip Cheshire, Terence Yeates, Yvonne Wilhelmina Smak
  • Patent number: 6776287
    Abstract: Water-soluble films suitable for water-dissolvable packaging comprising a polyurethane polymer having defined amounts of poly(ethylene oxide) (and optionally poly(propylene oxide)) groups and acid (preferably carboxyl) groups at least 50% neutralised with a base, at least a proportion of which is of the non-volatile type, the polyurethane being made by chain extension of a urethane prepolymer. Also water-soluble packaging (sachets, capsules, bags) made from the films and their use in packaging various materials, and a process for the production of aqueous polyurethane solutions which may be used for making such films.
    Type: Grant
    Filed: November 22, 2000
    Date of Patent: August 17, 2004
    Assignee: Aquasol Limited
    Inventors: David Charles Hinde, Gerardus Cornelis Overbeek, John Christopher Padget, Phillip Cheshire, Terence Yeates, Yvonne Wilhelmina Smak
  • Patent number: 6727296
    Abstract: A water-dissipatable polymer having colorant attached thereto through a covalent —O-link and an ink comprising the water-dissipatable polymer and a liquid medium.
    Type: Grant
    Filed: November 19, 2001
    Date of Patent: April 27, 2004
    Assignee: Avecia Limited
    Inventors: David Alan Pears, John Christopher Padget, Mark Robert James, Peter Gregory, Philip John Double
  • Publication number: 20040039089
    Abstract: An aqueous coating composition comprising a crosslinkable water-dispersible vinyl oligomer(s) wherein said composition when drying to form a coating has an open time of at least 20 minutes, a wet edge time of at least 10 minutes, a tack free time of ≦20 hours and an equilibrium viscosity of ≦5,000 Pa.s at any solids content when drying in the range of from 20 to 55 wt % using any shear rate in the range of from 9±0.5 to 90±5 s−1 and at 23±2° C.
    Type: Application
    Filed: March 20, 2003
    Publication date: February 26, 2004
    Inventors: Alfred Jean Paul Buckmann, Emilio Martin, Gerardus Cornelis Overbeek, John Christopher Padget, Jurgen Scheerder, Tom Annable
  • Publication number: 20040014922
    Abstract: Bulk-modified potting composition based on a curable epoxy resin or on a mixture of these resins, where the resin or the mixture is composed of an epoxy resin, a hardener, where appropriate an accelerator, and also other additives, such as fillers, flexibilizers, and colorants, which potting composition (a) comprises a three-dimensionally crosslinked polysiloxane in disperse form and with a particle size in the range from 0.02 &mgr;m to 50 &mgr;m, which, where appropriate, has reactive groups which can react chemically with the epoxy resin and/or the hardener, (b) a selected linear or branched siloxane compound which has reactive groups which can react chemically with the epoxy resin and/or the hardener, and also, where appropriate, (c) a low-molecular-weight oligomeric siloxane compound, the use of the potting composition as an engineering material or as an insulating material, and the moldings and insulation produced therefrom.
    Type: Application
    Filed: April 4, 2003
    Publication date: January 22, 2004
    Inventors: Alfred Jean Paul Buckmann, Emilio Martin, Gerardus Cornelis Overbeek, Johannes Ludovicus Martinus Van Hilst, John Christopher Padget, Pablo Steenwinkel, Tom Annable, Ronald Tennebroek
  • Patent number: 6639006
    Abstract: A process for preparing a patterned, cross-linked, acrylic-polymer, film coating on a substrate; the process comprising the steps of: a) applying to the substrate by an ink-jet printing process a mixture comprising: i) one or more cross-linkable, thermally ink-jettable, water-dissipatable, precursor(s) for one or more cross-linked acrylic-polymer(s); ii) one or more cross-linker(s) capable of cross-linking the precursor(s) for the acrylic-polymer(s); and iii) one or more colorant(s); and b) thereafter curing the mixture in situ to form the patterned, cross-linked, acrylic-polymer, film coating on the substrate. Preferably the substrate is a color filter suitable for use in an LCD display and the mixture is applied in a single pass. The precursor may itself comprise polymers, e.g. acrylic polymers. Ink for use in this process and substrates printed by this process are also described.
    Type: Grant
    Filed: April 3, 2001
    Date of Patent: October 28, 2003
    Assignee: Avecia Limited
    Inventors: David Cottrell, David Alan Pears, John Christopher Padget, Neil Anthony Tallant, Stephen George Yeates
  • Patent number: 6632858
    Abstract: The invention relates to polyurethanes, inks comprising polyurethanes and their use in ink jet printing where the polyurethane comprises a colored water-dissipatable polyurethane obtainable from the reaction of a polyisocyanate, a compound providing water-dispersing groups and a colorant having at least two functional groups.
    Type: Grant
    Filed: September 29, 2000
    Date of Patent: October 14, 2003
    Assignee: Avecia Limited
    Inventors: David Alan Pears, John Christopher Padget, Mark Robert James, Peter Gregory
  • Patent number: 6495626
    Abstract: Acrylic plastisol composition comprising a plasticiser component, a plasticiser compatible acrylic polymer powder component of primary particle size ≧0.4 &mgr;m and preferably not more than 30 &mgr;m, and Tg ≧65° C., and a plasticiser incompatible polymer powder component, where both polymers are preformed, are present in the weight ratio 95:5 to 40:60, and in combination are compatibly formulated with the plasticiser component.
    Type: Grant
    Filed: August 18, 1999
    Date of Patent: December 17, 2002
    Assignee: Zeneca Limited
    Inventors: Andrew Stuart Overend, David Henry Cooper, John Christopher Padget
  • Publication number: 20020136773
    Abstract: A novel microcapsule comprising an encapsulated material which is enclosed within a solid permeable shell of a polymer resin having surface modifying compounds capable of reacting with isocyanate incorporated therein is disclosed. The process for producing such microcapsules is likewise disclosed.
    Type: Application
    Filed: June 5, 2001
    Publication date: September 26, 2002
    Inventors: Herbert Benson Scher, Jinling Chen, Isabelle Mazeaud, David Braun Kanne, Ian Malcolm Shirley, Philip Wade, John Christopher Padget, Anne Waller
  • Patent number: 6455611
    Abstract: The invention relates to polyurethanes, inks comprising polyurethanes and their use in ink jet printing where the polyurethane comprises a colored water-dissipatable polyurethane obtainable by chain-terminating a polyurethane prepolymer with a colorant.
    Type: Grant
    Filed: September 29, 2000
    Date of Patent: September 24, 2002
    Assignee: Avecia Limited
    Inventors: David Alan Pears, John Christopher Padget, Mark Robert James, Peter Gregory
  • Patent number: 6395827
    Abstract: An aqueous crosslinkable coating composition suitable for the provision of thick coatings without incurring carbon dioxide bubble formation comprising: (A) an aqueous dispersion of at least one hydroxyl- and acid-functional vinyl polymer having a hydroxyl value of 8 to 250 mg KOH/g of polymer and an acid value of 2 to 55 mg KOH/g of polymer, where the contribution of at least 30% of the acid value results from a monocarboxylic acid(s) of formula: CH2—CR1—Q—CO2H  (1) where R1 is H or lower alkyl of 1 to 5 carbon atoms and Q is a spacer group of formula: [—C(═O)—X—(CH2)m—]k  (2) where X is —O— or —NH—, m is at least 1, preferably 2 or 3, and k is at least 1, preferably 2, 3, 4 or 5; and (B) at least one organic polyisocyanate. The acid of formula (1) preferably comprises &bgr;-carboxyethyl acrylate.
    Type: Grant
    Filed: November 22, 1999
    Date of Patent: May 28, 2002
    Assignee: Avecia Limited
    Inventors: David Alan Pears, Erik Hendrik Colstee, Gerardus Cornelis Overbeek, John Christopher Padget, Tijs Nabuurs
  • Patent number: 6017992
    Abstract: Process for the production of an aqueous polymer emulsion which process comprises:a) preparing a low molecular weight polymer containing acid-functional groups using a free-radical polymerisation process which employs a free-radical initiator and, for the purpose of controlling molecular weight, a transition metal chelate complex, wherein said low molecular weight polymer has a number average molecular weight within the range of from 500 to 50,000;b) conducting an aqueous emulsion polymerisation process to form an aqueous emulsion of a hydrophobic polymer from at least one olefinically unsaturated monomer, wherein the low molecular weight polymer of step a) is introduced to the aqueous medium of said emulsion polymerisation process before the start of and/or during said emulsion polymerisation process and becomes dissolved or dispersed in said aqueous medium.
    Type: Grant
    Filed: June 30, 1998
    Date of Patent: January 25, 2000
    Assignees: Zeneca Limited, Zeneca Resins BV
    Inventors: David Mark Haddleton, John Christopher Padget, Gerardus Cornelis Overbeek
  • Patent number: 5981642
    Abstract: Method of grafting a water-soluble organic oligomer(s) to an organic polymer(s) in aqueous latex form, which method comprises forming a water-based mixture of a water-soluble oligomer(s), an aqueous latex of a polymer(s), and at least one free radical polymerisable monomer, both of said oligomer(s) and polymer(s) being preformed, and carrying out free radical polymerisation of said at least one monomer to effect grafting between said oligomer(s) and said polymer(s).
    Type: Grant
    Filed: August 5, 1997
    Date of Patent: November 9, 1999
    Assignee: Zeneca Limited
    Inventors: Gerardus Cornelis Overbeek, Alison Dawn Bedells, John Christopher Padget
  • Patent number: 5859112
    Abstract: Process for making organic solvent-free aqueous crosslinkable polymer composition comprising: a) preparing an aqueous solution of an acid-functional olgiomer with Tg below 50.degree. C. and having crosslinker functional groups; b) conducting an aqueous emulsion polymerisation to make an aqueous emulsion of an olefinic hydrophobic polymer in the presence of the aqueous oligomer solution, the hydrophobic polymer having Tg at least 25.degree. C. higher than that of the oligomer and optionally crosslinker functional groups, and c) combining with a crosslinking agent reactable with the crosslinker groups of the oligomer and polymer, said composition having Koenig hardness of .gtoreq.40 sec and minimum film forming temperature (MFFT).ltoreq.55.degree. C. Also the aqueous composition so formed and its use in various applications. The aqueous composition has excellent properties and in particular an advantageous balance of MFFT and Koenig hardness.
    Type: Grant
    Filed: November 1, 1996
    Date of Patent: January 12, 1999
    Assignees: Zeneca Resins B.V., Zeneca Limited
    Inventors: Gerardus Cornelis Overbeek, Yvonne Wilhelmina Smak, Alfred Jean Paul Buckmann, John Christopher Padget
  • Patent number: 5804632
    Abstract: Process for the production of an aqueous polymer emulsion which process comprises:a) preparing a low molecular weight polymer containing acid-functional groups using a free-radical polymerisation process which employs a free-radical initiator and, for the purpose of controlling molecular weight, a transition metal chelate complex, wherein said low molecular weight polymer has a number average molecular weight within the range of from 500 to 50,000;b) conducting an aqueous emulsion polymerisation process to form an aqueous emulsion of a hydrophobic polymer from at least one olefinically unsaturated monomer, wherein the low molecular weight polymer of step a) is introduced to the aqueous medium of said emulsion polymerisation process before the start of and/or during said emulsion polymerisation process and becomes dissolved or dispersed in said aqueous medium.
    Type: Grant
    Filed: January 29, 1996
    Date of Patent: September 8, 1998
    Assignees: Zeneca Limited, Zeneca Resins BV
    Inventors: David Mark Haddleton, John Christopher Padget, Gerardus Cornelis Overbeek
  • Patent number: 5691400
    Abstract: A composition comprising water and the following components:(a) an epoxy compound comprising at least one epoxy group and at least one hydrolysable silyl group; and(b) a hydroxy functional polymer having carboxy and/or sulpho groups.The compositions are generally water-based and may be used for making films and coatings having good mechanical and physical properties.
    Type: Grant
    Filed: May 12, 1995
    Date of Patent: November 25, 1997
    Assignee: Zeneca Limited
    Inventors: John Gerard Carey, John Christopher Padget, David Alan Pears