Patents by Inventor Roger N. Rothon

Roger N. Rothon 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: 5578673
    Abstract: A polymeric dispersant having a low T.sub.g polymer component, e.g. polybutadiene, and a pendant silylated group with hydrolysable groups capable of associating with and dispersing. finely divided inorganic fillers. Curable compositions containing the polymeric dispersant can be cured into composite materials having improved resistance to stress induced by thermal cycling.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: November 26, 1996
    Assignee: Imperial Chemical Industries PLC
    Inventors: David P. Ashton, Geraldine A. Moorman, Roger N. Rothon
  • Patent number: 5530064
    Abstract: A polymeric dispersant having a low T.sub.g polymer component, e.g. polybutadiene, and a pendant silylated group with hydrolyzable groups capable of associating with and dispersing finely divided inorganic fillers. Curable compositions containing the polymeric dispersant can be cured into composite materials having improved resistance to stress induced by thermal cycling.
    Type: Grant
    Filed: October 4, 1994
    Date of Patent: June 25, 1996
    Assignee: Imperial Chemical Industries PLC
    Inventors: David P. Ashton, Geraldine A. Moorman, Roger N. Rothon
  • Patent number: 5519081
    Abstract: Highly filled, curable compositions containing a curable liquid, e.g. methyl methacrylate; 20 to 80% by weight of a finely divided inorganic filler of defined particle size, e.g. silica; a functionalized polymer containing a low Tg component which is soluble in the curable liquid, e.g. a functionalized vinyl aromatic/conjugated diene block copolymer; and other components which diperse the filler in the curable liquid and couple the filler to the matrix can be used to produce cured composites which show improved resistance to stress induced by thermal cycling.
    Type: Grant
    Filed: July 26, 1994
    Date of Patent: May 21, 1996
    Assignee: Imperial Chemical Industries PLC
    Inventors: David P. Ashton, Geraldine A. Moorman, Roger N. Rothon
  • Patent number: 5519083
    Abstract: Highly filled, curable compositions containing a curable liquid, e.g. methyl methacrylate; 20 to 80% by weight of a finely divided inorganic filler of defined particle size, e.g. silica; a non-functionalized polymer containing a low Tg component which is soluble in the curable liquid, e.g. a non-functionalized vinyl aromatic/conjugated diene block copolymer; and other components which diperse the filler in the curable liquid and couple the filler to the matrix can be used to produce cured composites which show improved resistance to stress induced by thermal cycling.
    Type: Grant
    Filed: June 15, 1994
    Date of Patent: May 21, 1996
    Assignee: Imperial Chemical Industries PLC
    Inventors: David P. Ashton, Geraldine A. Moorman, Roger N. Rothon
  • Patent number: 5461101
    Abstract: The invention relates to particulate magnesium hydroxide suitable for use as a flame retardant additive for a polymer which has a BET surface area of 13-30 m.sup.2 /g and an average particle size (D.sub.50) of 0.3-1.0 micron.The invention also relates to a process for producing a particulate magnesium hydroxide having a BET surface area of 13-30 m.sup.2 /g and an average particle size (D.sub.50) of 0.3-1.9 micron by calcining a magnesium feedstock to magnesium oxide having a BET surface area of 3-10 m.sup.2 /g; hydrating the magnesium oxide to a magnesium hydroxide hydration product in the absence of added catalyst; and milling the magnesium hydroxide hydration product.The invention further relates to a polymeric article containing particulate magnesium hydroxide according to the invention.
    Type: Grant
    Filed: April 23, 1993
    Date of Patent: October 24, 1995
    Assignee: Defped Limited
    Inventors: Roger N. Rothon, Adrian M. Ryder, Anthony G. Bourke
  • Patent number: 5089539
    Abstract: A cohesive polymer matrix comprising a matrix polymer and a coated particulate filler dispersed therein, characterized in that the matrix polymer is an emulsion rubber, and the filler is coated at least in part with a composition comprising an organic coating polymer of number average molecular weight of 4,500 to 200,000 which contains an acidic group (or a precursor thereof) and an unsaturated group, optionally linked to the matrix polymer and a process for its production.
    Type: Grant
    Filed: May 20, 1988
    Date of Patent: February 18, 1992
    Assignee: Imperial Chemical Industries PLC
    Inventors: John G. Carey, Martin B. Evans, Roger N. Rothon
  • Patent number: 5039718
    Abstract: A cohesive polymer matrix comprising a matrix polymer and a coated particulate fillter dispersed therein, characterized in that the matrix polymer is a cross-linked olefin/acrylic polymer, and the filler is coated at least in part with a composition comprising an organic coating polymer of number average molecular weight of up to 200,000, which contains an acidic group (or a precursor thereof) and an unsaturated group optionally linked to the matrix polymer and a process for its production, and precursors thereof for use in the process.
    Type: Grant
    Filed: May 20, 1988
    Date of Patent: August 13, 1991
    Assignee: Imperial Chemical Industries PLC
    Inventors: J. Reginald Ashley, Martin B. Evans, Roger N. Rothon
  • Patent number: 4999387
    Abstract: A cohesive polymer comprising a matrix a matrix polymer and a coated particulate filler dispersed therein, characterized in that the matrix polymer is an acrylic polymer, and the filler is coated at least in part with a composition comprising an organic coating polymer of number average molecular weight of up to 300,000, which contains an acidic group (or precursor thereof) and an unsaturated group optionally linked to the matrix acrylic polymer, and a process for its production, and precursors thereof for use in the process.
    Type: Grant
    Filed: December 26, 1989
    Date of Patent: March 12, 1991
    Assignee: Imperial Chemical Industries PLC
    Inventors: Roger N. Rothon, Thomas A. Ryan, Phillip J. Tavener
  • Patent number: 4908396
    Abstract: A cohesive polymer matrix comprising a matrix polymer and a coated particulate filler dispersed therein, characterized in that the matrix polymer is a solution rubber, and the filler is coated at least in part with a composition comprising an organic coating polymer of number average molecular weight of up to 3,000 which contains an acidic group (or a precursor thereof) and unsaturated groups optionally linked to the matrix polymer at least 25% w/w of which are vinyl groups.
    Type: Grant
    Filed: May 20, 1988
    Date of Patent: March 13, 1990
    Assignee: Imperial Chemical Industries PLC
    Inventors: Martin B. Evans, Roger N. Rothon
  • Patent number: 4808654
    Abstract: The use of a material of empirical composition MgO(CO.sub.2).sub.b (H.sub.2 O).sub.c, where b is any value in the range 0.5 to 1.1 and c is any value in the range 0 to 2, and which have an amorphous content of at least 75% by weight, as a filler and/or a fire retardant for a solid or fluid matrix, a solid or fluid matrix (in particular a plastics matrix) containing such a material as dispersed particles, the materials in defined particulate morphologies, some of the materials per se and a process for their preparation.
    Type: Grant
    Filed: July 1, 1986
    Date of Patent: February 28, 1989
    Assignee: Imperial Chemical Industries PLC
    Inventors: Nicholas Rolfe, Richard D. A. Woode, Roger N. Rothon
  • Patent number: 4764544
    Abstract: A coated particulate filler to the surface of which there is bound an acid group-containing organic polymer which also comprises a nitrogen-containing group capable of reacting with an organic polymeric material. The acidic group may be a carboxylic acid group and the nitrogen-containing group may be an amide group or an amine group, especially a alkylamine or a polyakylamine derivative of an amine group. The organic polymeric material may contain ethylenically unsaturated groups or halogen groups, and reaction may take place during cross-linking of the organic polymeric material. Compositions comprising coated particulate filler and organic polymeric material have improved tensile modulus.
    Type: Grant
    Filed: August 19, 1985
    Date of Patent: August 16, 1988
    Assignee: Imperial Chemical Industries PLC
    Inventors: John G. Carey, Roger N. Rothon, Martin Bottrill
  • Patent number: 4256988
    Abstract: The invention relates to electric incandescent lamps having a gas fill containing halogen. The internal surface of the lamp envelope and optionally also the exposed surface of internal components of the lamp are protected from attack by halogens including fluorine by a continuous imperforate coating composed of a metal oxide resistant to halogen attack. In order to achieve the necessary degree of continuity of the coating the oxide is formed in situ from a compound of the metal deposited as a solution on the surface. The preferred oxide is alumina, the other oxides of polyvalent and transition metals, including metals of the lanthanide series may be used. The coatings are preferably formed from solutions of halides of the metals in polar organic solvents such as methanol. The invention prolongs the life of lamps provided with the protective coating and enable such resistant and possibly cheaper materials to be employed for certain lamp components.
    Type: Grant
    Filed: December 26, 1978
    Date of Patent: March 17, 1981
    Assignees: Thorn Lighting Limited, Imperial Chemical Industries Limited
    Inventors: James R. Coaton, John M. Rees, Roger N. Rothon