Patents by Inventor James Minn

James Minn 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).

  • Treating polymerized rosin with sodium hydroxy methane sulfonate to improve color stability
    Patent number: 5084554
    Abstract: The color stability of polymerized rosin is improved by heating the polymerized rosin at a temperature of 250.degree.-290.degree. C. in the presence of 0.05% to 5% sodium hydroxymethane sulfonate.
    Type: Grant
    Filed: January 2, 1991
    Date of Patent: January 28, 1992
    Assignee: Hercules Incorporated
    Inventor: James Minn
  • Use of a mixed catalyst system to improve the viscosity stability of rosin resins
    Patent number: 5049652
    Abstract: Rosin esters having improved viscosity stability are prepared by heating a mixture of rosin and a polyol in the presence of a catalyst mixture of 0.1% to 0.6% by weight calcium bis(ethyl 3,5-di-t-butyl-4-hydroxybenzyl phosphonate) and 0.02 to 1.0% by weight of a second calcium compound selected from calcium carbonate, calcium oxide and a calcium salt of an aliphatic carboxylic acid, all percentages being based on the weight of rosin.
    Type: Grant
    Filed: November 30, 1990
    Date of Patent: September 17, 1991
    Assignee: Hercules Incorporated
    Inventor: James Minn
  • Sodium hydroxymethane sulfonate to improve the color stability of rosin resins
    Patent number: 5021548
    Abstract: The color stability of rosin esters is improved by carrying out the esterification reaction in the presence of 0.05% to 5% sodium hydroxymethane sulfonate (SHS). The color stability of polymerized rosin is improved by heating at a temperature of 250.degree.-290.degree. C. in the presence of SHS.
    Type: Grant
    Filed: January 22, 1990
    Date of Patent: June 4, 1991
    Assignee: Hercules Incorporated
    Inventor: James Minn
  • Process for producing O,O-dialkyl dithiophosphoric acid esters
    Patent number: 4283338
    Abstract: Disclosed is a method for improving the yield of dialkyl dithiophosphoric acid esters produced by the Lewis acid catalyzed reaction of an O,O-dialkyl dithiophosphoric acid and an organic chloride. More specifically, the method concerns the improvement wherein the reaction is conducted under sufficient pressure to maintain the liberated hydrogen chloride in the reaction system during the course of the reaction.
    Type: Grant
    Filed: February 22, 1980
    Date of Patent: August 11, 1981
    Assignee: Boots Hercules Agrochemicals Co.
    Inventor: James Minn
  • Process for producing dialkyl dithiophosphoric acid esters
    Patent number: 4283335
    Abstract: Disclosed is a method for improving the yield of dialkyl dithiophosphoric acid esters produced by the Lewis acid catalyzed reaction of an O,O-dialkyl dithiophosphoric acid and an organic chloride. More specifically, the method concerns the improvement wherein the reaction is carried out in the presence of from 0.1 to 1.5 moles, per mole of organic chloride, of an anhydride of a fatty acid containing 2 to 5 carbon atoms.
    Type: Grant
    Filed: February 22, 1980
    Date of Patent: August 11, 1981
    Assignee: Boots Hercules Agrochemicals Co.
    Inventor: James Minn
  • Process for preparing esters of O,O-dialkyl dithiophosphoric acid
    Patent number: 4282153
    Abstract: Disclosed is a method for improving the yields of insecticidal compositions produced by reacting an O,O-dialkyl dithiophosphoric acid with a chloro-p-dioxane in the presence of a Lewis acid catalyst and a stoichiometric excess of the acid reactant. More specifically, the method concerns the improvement wherein certain bicyclo-heptenes are added to the system resulting from the reaction and reacted with the excess of O,O-dialkyl dithiophosphoric acid present in the system.
    Type: Grant
    Filed: February 22, 1980
    Date of Patent: August 4, 1981
    Assignee: Boots Hercules Agrochemicals Co.
    Inventor: James Minn