Patents by Inventor Julian A. Waters
Julian A. Waters 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: 5534585Abstract: The tendency for hard and irregular particles of titanium dioxide pigment to adversely affect the sheen and coin mar resistance of a dried coating into which they have been incorporated is reduced by modifying the particles with polymer particles which have been preformed and are therefore of a more pre-determinable shape and size. The polymer particles are chemically bonded to a polymeric water-soluble compound containing moieties which are adsorbable onto the titanium dioxide particles so that on mixing a colloidally stabilised aqueous dispersion of the polymer particles with a colloidally stabilised aqueous dispersion of titanium dioxide particles, the moieties adsorb onto the titanium dioxide to form a colloidally stable aqueous dispersion of polymer-modified titanium dioxide which is useful in coating compositions.Type: GrantFiled: August 24, 1994Date of Patent: July 9, 1996Assignee: Imperial Chemical Industries PLCInventors: Brian J. Roulstone, Julian A. Waters
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Patent number: 5412019Abstract: The tendency for hard and irregular particles of titanium dioxide pigment to adversely affect the sheen and coin mar resistance of a dried coating into which they have been incorporated is reduced by modifying the particles with polymer particles which have been preformed and are therefore of a more pre-determinable shape and size. The polymer particles are chemically bonded to a polymeric water-soluble compound containing moieties which are adsorbable onto the titanium dioxide particles so that on mixing a colloidally stabilised aqueous dispersion of the polymer particles with a colloidally stabilised aqueous dispersion of titanium dioxide particles, the moieties adsorb onto the titanium dioxide to form a colloidally stable aqueous dispersion of polymer-modified titanium dioxide which is useful in coating compositions.Type: GrantFiled: January 31, 1994Date of Patent: May 2, 1995Assignee: Imperial Chemical Industries PLCInventors: Brian J. Roulstone, Julian A. Waters
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Patent number: 5296524Abstract: A composite particle dispersion is prepared by mixing an aqueous dispersion of polymer particles which will form the particle shell with pre-formed polymer particles which will form the core at a temperature above the glass transition temperature for the shell particles. In order to ensure composite particle formation, certain interfacial energy criteria have to be satisfied for the core particle surface/shell particle surface/liquid interfaces. In order to allow the desired energy relationships to be established, the core particle surfaces include covalently attached ionic groupings which enable a permanent modification of the core particle surface to be made.Type: GrantFiled: February 1, 1993Date of Patent: March 22, 1994Assignee: Imperial Chemical Industries PLCInventor: Julian A. Waters
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Patent number: 5210113Abstract: A composite particle dispersion is prepared by mixing an aqueous dispersion of polymer particles which will form the particle shell with pre-formed polymer particles which will form the core at a temperature above the glass transition temperature for the shell particles. In order to ensure composite particle formation, certain interfacial energy criteria have to be satisfied for the core particle surface/shell particle surface/liquid interfaces. In order to allow the desired energy relationships to be established, the core particle surfaces include covalently attached ionic groupings which enable a permanent modification of the core particle surface to be made.Type: GrantFiled: July 20, 1990Date of Patent: May 11, 1993Assignee: Imperial Chemical Industries PLCInventor: Julian A. Waters
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Patent number: 4997864Abstract: A process for the preparation of composite particle dispersons is disclosed. The composite particles have a core particle 1 surrounded by a second material 2. Normally a core shell particle will be formed and the second material which forms the shell will be a polymer material.The composite particles are formed by mixing a dispersion of polymer particles with pre-formed core material particles. The polymer particles are stabilized relative to one another, and the core material particles are destabilized in the dispersion so that they are able to make contact with the surfaces of the polymer particles. The process takes place at a temperature above the operative glass transition temperature of the polymer, and in the process the polymer spreads over the surface of the core particle so that the core particle is encapsulated.Type: GrantFiled: January 24, 1989Date of Patent: March 5, 1991Assignee: Imperial Chemical Industries PLCInventor: Julian A. Waters
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Patent number: 4883873Abstract: Polymerizable monomers of structure ##STR1## wherein R.sub.1 and R.sub.2 are C.sub.2-3 alkylene groups, the same or different; A and B are substituted C.sub.2-18 alkyl groups at least one group A or B comprising in a substituent a polymerizable ethylenically unsaturated group; and X=H, C.sub.1-18 alkyl or ##STR2## the monomers being substantially free from non-polymerizable water-soluble contaminants; processes of manufacture and derived polymers including copolymers; and aqueous polymer dispersions, their manufacture and use in coatings including paints.Type: GrantFiled: July 12, 1988Date of Patent: November 28, 1989Assignee: Imperial Chemical Industries PLCInventors: George E. Abboud, Christopher H. Such, Susan M. Horley, Julian A. Waters
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Patent number: 4880931Abstract: Polymerizable monomers of structure ##STR1## wherein R.sub.1 and R.sub.2 are C.sub.2-3 alkylene groups, the same or different; A and B are substituted C.sub.2-18 alkyl groups at least one group A or B comprising in a substituent a polymerizable ethylenically unsaturated group; ane X=H, C.sub.1-18 alkyl or ##STR2## the monomers being substantially free from non-polymerizable water-soluble contaminants; processes of manufacture and derived polymers including copolymers; and aqueous polymer dispersions, their manufacture and use in coatings including paints.Type: GrantFiled: July 13, 1988Date of Patent: November 14, 1989Assignee: Imperial Chemical Industries PLCInventors: George E. Abboud, Christopher H. Such, Susan M. Horley, Julian A. Waters
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Patent number: 4783539Abstract: Polymerizable monomers of structure ##STR1## wherein R.sub.1 and R.sub.2 are C.sub.2-3 alkylene groups, the same or different; A and B are substituted C.sub.2-18 alkyl groups at least one group A or B comprising in a substituent a polymerizable ethylenically unsaturated group; and x=H, C.sub.1-18 alkyl or ##STR2## the monomers being substantially free from non-polymerizable water-soluble contaminants; processes of manufacture and derived polymers including copolymers; and aqueous polymer dispersions, their manufacture and use in coatings including paints.Type: GrantFiled: January 2, 1986Date of Patent: November 8, 1988Assignee: Imperial Chemical Industries PLCInventors: George E. Abboud, Christopher H. Such, Susan M. Horley, Julian A. Waters
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Patent number: 4453261Abstract: Sterically stabilized aqueous polymer depersions of at least 20% solids content are made by free radical-initiated polymerization of monomers in an aqueous medium at a temperature at least 10.degree. C. higher that the glass transition temperature of the polymer to be formed, in the presence of a pre-formed amphipathic block or graft copolymer which contains in the molecule a component solvatable by the medium and another component capable of associating with the polymer particles formed, the conditions being such that there is at no time present a separate monomer phase. The dispersions are useful as a basis of improved aqueous coating compositions.Type: GrantFiled: May 12, 1982Date of Patent: June 5, 1984Assignee: Imperial Chemical Industries PLCInventors: Frederick A. Waite, Julian A. Waters
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Patent number: D402685Type: GrantFiled: October 31, 1997Date of Patent: December 15, 1998Assignee: Adobe Systems, Inc.Inventor: Julian Waters