Patents by Inventor Yi H. Paik
Yi H. Paik 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: 5612447Abstract: A method for producing polysuccinimide is provided. Thermal polymerization of maleamic acid at a temperature of from about 160.degree. C. to about 330.degree. C. produces polysuccinimide. The reaction is optionally conducted in the presence of one or more processing aids, solvents or diluents. The polysuccinimide is particularly useful as a detergent additive.Type: GrantFiled: November 15, 1994Date of Patent: March 18, 1997Assignee: Rohm and Haas CompanyInventors: Michael B. Freeman, Yi H. Paik, Ethan S. Simon, Graham Swift
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Patent number: 5556938Abstract: The present invention relates to an acid catalyzed thermal polycondensation process for producing amino acid polymers. More specifically, amino acid polymers are produced by thermally condensing a mixture of one or more amino acids and optionally one or more polyfunctional monomers, using an acid catalyst, while maintaining an intimate admixture. Processing techniques useful for maintaining an intimate admixture include adding to the mixture one or more processing aids, using mechanical means, and combinations thereof. The amino acid polymers produced by this process are useful as cleaning and detergent additives; fertilizer and pesticide additives; personal care product additives; dispersants for inorganic particulates, aqueous emulsions, and drilling muds; and water treatment and oil production operation additives as corrosion and scale inhibitors.Type: GrantFiled: June 6, 1995Date of Patent: September 17, 1996Assignee: Rohm and Haas CompanyInventors: Michael B. Freeman, James M. Lipovsky, Yi H. Paik, Jan E. Shulman, Graham Swift
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Patent number: 5554721Abstract: The present invention relates to an acid catalyzed thermal polycondensation process for producing amino acid polymers. More specifically, amino acid polymers are produced by thermally condensing a mixture of one or more amino acids and optionally one or more polyfunctional monomers, using an acid catalyst, while maintaining an intimate admixture. Processing techniques useful for maintaining an intimate admixture include adding to the mixture one or more processing aids, using mechanical means, and combinations thereof. The amino acid polymers produced by this process are useful as cleaning and detergent additives; fertilizer and pesticide additives; personal care product additives; dispersants for inorganic particulates, aqueous emulsions, and drilling muds; and water treatment and oil.Type: GrantFiled: June 6, 1995Date of Patent: September 10, 1996Assignee: Rohm and Haas CompanyInventors: David E. Adler, Michael B. Freeman, James M. Lipovsky, Yi H. Paik, Jan E. Shulman, Graham Swift
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Patent number: 5552514Abstract: The present invention relates to an acid catalyzed thermal polycondensation process for producing amino acid polymers. More specifically, amino acid polymers are produced by thermally condensing a mixture of one or more amino acids and optionally one or more polyfunctional monomers, using an acid catalyst, while maintaining an intimate admixture. Processing techniques useful for maintaining an intimate admixture include adding to the mixture one or more processing aids, using mechanical means, and combinations thereof. The amino acid polymers produced by this process are useful as cleaning and detergent additives; fertilizer and pesticide additives; personal care product additives; dispersants for inorganic particulates, aqueous emulsions, and drilling muds; and water treatment and oil production operation additives as corrosion and scale inhibitors.Type: GrantFiled: June 6, 1995Date of Patent: September 3, 1996Assignee: Rohm and Haas CompanyInventors: David E. Adler, Michael B. Freeman, James M. Lipovsky, Yi H. Paik, Jan E. Shulman, Graham Swift
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Patent number: 5531934Abstract: The present invention provides a method of inhibiting corrosion of ferrous metals in aqueous systems. The corrosion is inhibited by adding an effective amount of one or more poly(amino acids) to the aqueous system. Aqueous systems include for example water treatment systems and equipment used for detergent applications. The poly(amino acids) comprise a reaction product of at least one compound selected from amino acids, amic acids, ammonium salts of monoethylenically unsaturated dicarboxylic acids, ammonium salts of hydroxypolycarboxylic acids and combinations thereof.In one embodiment the poly(amino acids) are added to detergent solutions to inhibit corrosion in equipment for detergent applications. In another embodiment, corrosion inhibitors comprising one or more homopolymers of amino acids and one or more pyrophosphates are added to aqueous systems to inhibit corrosion.Type: GrantFiled: September 12, 1994Date of Patent: July 2, 1996Assignee: Rohm & Haas CompanyInventors: Michael B. Freeman, William M. Hann, Yi H. Paik, Graham Swift
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Patent number: 5491212Abstract: A method for producing polysuccinimides is provided. A rotary tray dryer operating at an internal temperature of from about 110.degree. to about 300.degree. C. and providing a residence time of from about 1 hour to about 10 hours is used in the polycondensation of one or more amino acids, amic acids or ammonium salts of monoethylenically unsaturated dicarboxylic acids to produce polysuccinimides.Type: GrantFiled: January 12, 1994Date of Patent: February 13, 1996Assignee: Rohm and Haas CompanyInventors: Yi H. Paik, Ethan S. Simon, Graham Swift
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Patent number: 5484878Abstract: A process is provided for preparing polysuccinimides by forming a polymerization mixture of poly(alkylene glycol), aspartic acid and, optionally, one or more other amino acids; heating the mixture to an elevated temperature; and maintaining the mixture at the elevated temperature to form polysuccinimides.Type: GrantFiled: August 25, 1994Date of Patent: January 16, 1996Assignee: Rohm and Haas CompanyInventors: Yi H. Paik, Ethan S. Simon, Graham Swift
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Patent number: 5463017Abstract: A process is provided for preparing polysuccinimides by forming a polymerization mixture of poly(alkylene glycol), maleamic acid and, optionally one or more other amic acids, heating the mixture to an elevated temperature, and maintaining the mixture at the elevated temperature to form polysuccinimides.Type: GrantFiled: August 25, 1994Date of Patent: October 31, 1995Assignee: Rohm and Haas CompanyInventors: Yi H. Paik, Ethan S. Simon, Graham Swift
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Patent number: 5459234Abstract: A continuous process for preparing polymers is provided: The continuous process produces polymers from monoethylenically unsaturated acids or anhydrides, and a nitrogen-containing compound, optionally in the presence of a fluidizing agent. The polymers are useful as detergent additives, pigment and mineral dispersants, additives for fertilizers, and corrosion and scale inhibitors in boilers and cooling towers.Type: GrantFiled: January 12, 1995Date of Patent: October 17, 1995Assignee: Rohm & Haas CompanyInventors: Newman M. Bortnick, Robert E. Jerman, James M. Lipovsky, Yi H. Paik, Ethan S. Simon, Graham Swift
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Patent number: 5457176Abstract: The present invention relates to an acid catalyzed thermal polycondensation process for producing amino acid polymers. More specifically, amino acid polymers are produced by thermally condensing a mixture of one or more amino acids and optionally one or more polyfunctional monomers, using an acid catalyst, while maintaining an intimate admixture. Processing techniques useful for maintaining an intimate admixture include adding to the mixture one or more processing aids, using mechanical means, and combinations thereof. The amino acid polymers produced by this process are useful as cleaning and detergent additives; fertilizer and pesticide additives; personal care product additives; dispersants for inorganic particulates, aqueous emulsions, and drilling muds; and water treatment and oil production operation additives as corrosion and scale inhibitors.Type: GrantFiled: March 16, 1994Date of Patent: October 10, 1995Assignee: Rohm and Haas CompanyInventors: David E. Adler, Michael B. Freeman, James M. Lipovsky, Yi H. Paik
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Patent number: 5424391Abstract: A method for producing polysuccinimide is provided. Thermal polymerization of fumaramic acid at a temperature of from about 160.degree. C. to about 330.degree. C. produces polysuccinimide. The reaction is optionally conducted in the presence of one or more processing aids, solvents or diluents. The polysuccinimide is particularly useful as a detergent additive.Type: GrantFiled: July 20, 1993Date of Patent: June 13, 1995Assignee: Rohm and Haas CompanyInventors: Yi H. Paik, Graham Swift, Ethan S. Simon, Michael B. Freeman
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Patent number: 5410017Abstract: A continuous process for preparing polymers is provided: The continuous process produces polymers from monoethylenically unsaturated acids or anhydrides, and a nitrogen-containing compound, optionally in the presence of a fluidizing agent. The polymers are useful as detergent additives, pigment and mineral dispersants, additives for fertilizers, and corrosion and scale inhibitors in boilers and cooling towers.Type: GrantFiled: May 21, 1993Date of Patent: April 25, 1995Assignee: Rohm and Haas CompanyInventors: Newman M. Bortnick, Robert E. Jerman, James M. Lipovsky, Yi H. Paik, Ethan S. Simon, Graham Swift
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Patent number: 5393868Abstract: A method for producing polysuccinimide is provided. Thermal polymerization of maleamic acid at a temperature of from about 160.degree. C. to about 330.degree. C. produces polysuccinimide. The reaction is optionally conducted in the presence of one or more processing aids, solvents or diluents. The polysuccinimide is particularly useful as a detergent additive.Type: GrantFiled: October 13, 1992Date of Patent: February 28, 1995Assignee: Rohm and Haas CompanyInventors: Michael B. Freeman, Yi H. Paik, Ethan S. Simon, Graham Swift
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Patent number: 5380817Abstract: A process is provided for preparing polysuccinimides by forming a polymerization mixture of poly(alkylene glycol), aspartic acid and, optionally, one or more other amino acids; heating the mixture to an elevated temperature; and maintaining the mixture at the elevated temperature to form polysuccinimides.Type: GrantFiled: July 10, 1992Date of Patent: January 10, 1995Assignee: Rohm and Haas CompanyInventors: Yi H. Paik, Ethan S. Simon, Graham Swift
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Patent number: 5371179Abstract: Polysuccinimide polymers of from about 5 to 100 percent by weight of methylenesuccinimide moieties, and from 0 to about 95 percent by weight of one or more amino acid moieties are provided. A process is provided for preparing polysuccinimide polymers by forming a polymerization mixture of poly(alkylene glycol), ammonia, one or more monoethylenically unsaturated poly(carboxylic acids) and, optionally, one or more other monoethylenically unsaturated compounds; heating the mixture to an elevated temperature; and maintaining the mixture at the elevated temperature to form polysuccinimide polymers.Type: GrantFiled: July 10, 1992Date of Patent: December 6, 1994Assignee: Rohm and Haas CompanyInventors: Yi H. Paik, Ethan S. Simon, Graham Swift
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Patent number: 5371177Abstract: A process is provided for preparing polysuccinimides by forming a polymerization mixture of poly(alkylene glycol), maleamic acid and, optionally one or more other amic acids, heating the mixture to an elevated temperature, and maintaining the mixture at the elevated temperature to form polysuccinimides.Type: GrantFiled: July 10, 1992Date of Patent: December 6, 1994Assignee: Rohm and Haas CompanyInventors: Yi H. Paik, Ethan S. Simon, Graham Swift
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Patent number: 5328972Abstract: A process for preparing polymers having molecular weights below 5,000 and polydispersity below 2.5 is provided. The polymerization is conducted in supercritical carbon dioxide at temperatures of at least 200.degree. C. and pressures above 3,500 psi. The process can be continuous, semi-continuous, or batch. The polymers are useful as detergent additives, scale inhibitors, dispersants and crystal growth modifiers.Type: GrantFiled: September 28, 1992Date of Patent: July 12, 1994Assignee: Rohm and Haas CompanyInventors: Emmanuel A. Dada, Willie Lau, Richard F. Merritt, Yi H. Paik, Graham Swift
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Patent number: 5319145Abstract: A method for producing polysuccinimides is provided. A rotary tray operating at an internal temperature of from about 110 to about 300.degree. C. and providing a residence time of from about 1 hour to about 10 hours is used in the polycondensation of one or more amino acids, amic acids or ammonium salts of monoethylenically unsaturated dicarboxylic acids to produce polysuccinimides.Type: GrantFiled: July 10, 1992Date of Patent: June 7, 1994Assignee: Rohm and Haas CompanyInventors: Yi H. Paik, Ethan S. Simon, Graham Swift
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Patent number: 5266237Abstract: Detergent compositions containing from 0.5 to about 50 percent by weight polysuccinimide are provided. These compositions have enhanced anti-encrustation, soil removal and anti-redeposition properties.Type: GrantFiled: July 31, 1992Date of Patent: November 30, 1993Assignee: Rohm and Haas CompanyInventors: Michael B. Freeman, Yi H. Paik, Ethan S. Simon, Graham Swift