Patents Assigned to SRCHEM, Inc.
  • Polymers of maleic acid with amines
    Patent number: 5688907
    Abstract: Polymers of maleic acid may be prepared by thermally polymerizing malic acid, maleic acid or fumaric acid with less than one equivalent of ammonia. The polymers are modified by the incorporation of amines, carboxylic acids or combinations thereof. The polymers formed are excellent inhibitors of alkaline earth salt deposition, dispersants, tartar control additives, detergent additives, and water treatment agents.
    Type: Grant
    Filed: May 22, 1995
    Date of Patent: November 18, 1997
    Assignee: SRCHEM, Inc.
    Inventors: Louis L. Wood, Gary J. Calton
  • Copolymers of polyaspartic acid
    Patent number: 5510427
    Abstract: Higher molecular weight copolymers of polyaspartic acid which are suitable for the inhibition of scale deposition may be obtained by reacting maleic acid and ammonia in a stoichiometric excess, with a diamine or a triamine, at 120.degree.-350.degree. C., preferably 180.degree.-300.degree. C., and then converting the copolymer of polysuccinimide formed to a salt of a copolymer of polyaspartic acid by hydrolysis with a hydroxide.
    Type: Grant
    Filed: May 17, 1995
    Date of Patent: April 23, 1996
    Assignee: SRCHEM, Inc.
    Inventor: Louis L. Wood
  • Copolymers of polyaspartic acid
    Patent number: 5510426
    Abstract: Higher molecular weight copolymers of polyaspartic acid which are suitable for the inhibition of scale deposition may be obtained by reacting maleic acid and ammonia in a stoichiometric excess, with a diamine or a triamine, at 120.degree.-350.degree. C., preferably 180.degree.-300.degree. C., and then converting the copolymer of polysuccinimide formed to a salt of a copolymer of polyaspartic acid by hydrolysis with a hydroxide.
    Type: Grant
    Filed: May 17, 1995
    Date of Patent: April 23, 1996
    Assignee: SRCHEM, Inc.
    Inventor: Louis L. Wood
  • Copolymers of polyaspartic acid
    Patent number: 5502117
    Abstract: Higher molecular weight copolymers of polyaspartic acid which are suitable for the inhibition of scale deposition may be obtained by reacting maleic acid and ammonia in a stoichiometric excess, with a diamine or a triamine, at 120.degree.-350.degree. C., preferably 180.degree.-300.degree. C., and then converting the copolymer of polysuccinimide formed to a salt of a copolymer of polyaspartic acid by hydrolysis with a hydroxide.
    Type: Grant
    Filed: May 17, 1995
    Date of Patent: March 26, 1996
    Assignee: Srchem, Inc.
    Inventor: Louis L. Wood
  • Amino acid copolymers of maleic acid
    Patent number: 5496914
    Abstract: Polymers of maleic, fumaric or malic acids or maleic, fumaric or malic acid and ammonia with amino acids are prepared by heating at 180.degree.-350.degree. C., preferably 200.degree.-300.degree. C. The polymer formed may be converted to a salt by hydrolysis with a metal hydroxide or ammonium hydroxide.
    Type: Grant
    Filed: January 18, 1995
    Date of Patent: March 5, 1996
    Assignee: SRCHEM, Inc.
    Inventors: Louis L. Wood, Gary J. Calton
  • Copolymers of polyaspartic acid
    Patent number: 5466760
    Abstract: Higher molecular weight copolymers of polyaspartic acid which are suitable for the inhibition of scale deposition may be obtained by reacting maleic acid and ammonia in a stoichiometric excess, with a diamine or a triamine, at 120.degree.-350.degree. C., preferably 180.degree.-300.degree. C., and then converting the copolymer of polysuccinimide formed to a salt of a copolymer of polyaspartic acid by hydrolysis with a hydroxide.
    Type: Grant
    Filed: January 17, 1995
    Date of Patent: November 14, 1995
    Assignee: Srchem, Inc.
    Inventor: Louis L. Wood
  • Polymers of maleic acid with amines
    Patent number: 5442038
    Abstract: Polymers of maleic acid may be prepared by thermally polymerizing malic acid, maleic acid or fumaric acid with less than one equivalent of ammonia. The polymers are modified by the incorporation of amines, carboxylic acids or combinations thereof. The polymers formed are excellent inhibitors of alkaline earth salt deposition, dispersants, tartar control additives, detergent additives, and water treatment agents.
    Type: Grant
    Filed: October 6, 1993
    Date of Patent: August 15, 1995
    Assignee: SRCHEM, Inc.
    Inventors: Louis L. Wood, Gary J. Calton
  • Amino acid copolymers of maleic acid
    Patent number: 5408029
    Abstract: Polymers of maleic, fumaric or malic acids or maleic, fumaric or malic acid and ammonia with amino acids are prepared by heating at 180.degree.-350.degree. C., preferably 200.degree.-300.degree. C. The polymer formed may be converted to a salt by hydrolysis with a metal hydroxide or ammonium hydroxide.
    Type: Grant
    Filed: October 6, 1993
    Date of Patent: April 18, 1995
    Assignee: SRCHEM, Inc.
    Inventors: Lousi L. Wood, Gary J. Calton