Patents Assigned to Minemet Rechreche
  • Hydroxy-diphosphonic acid derivatives of higher carboxylic acids
    Patent number: 4559181
    Abstract: A high efficiency process for producing hydroxy-diphosphonic acid derivatives of higher carboxylic acids comprising a first step of mixing a tri-valent phosphorous compound with the higher carboxylic acid in a molar ratio in the range of 13:12 to 18:12, and subsequently heating the reaction mixture to a temperature of 80.degree. to 110.degree. C. for about 3 to 20 hours.In one embodiment, a subsequent solvolysis step is employed wherein the product resulting from the heating step is heated with a solvent having a hydroxyl function.
    Type: Grant
    Filed: December 21, 1983
    Date of Patent: December 17, 1985
    Assignee: Minemet Rechreche
    Inventor: Yves Leroux