Patents Assigned to Rhone-Poulenc Chemicals Ltd.
  • Patent number: 6225511
    Abstract: Fluorinated ethers of the formula: wherein R is hydrogen, fluorine, alkyl of 1 to 6 carbon atoms, or fluoroalkyl of 1 to 6 carbon atoms, R′ is hydrogen, alkyl of 1 to 6 carbon atoms, or fluoroalkyl of 1 to 6 carbon atoms, and R″ is fluorine, alkyl of 1 to 6 carbon atoms or fluoroalkyl of 1 to 6 carbon atoms are prepared by fluorinating a corresponding ether of formula: with a solid transition metal fluoride fluorinating agent such as cobaltic fluoride.
    Type: Grant
    Filed: March 14, 2000
    Date of Patent: May 1, 2001
    Assignee: Rhone-Poulenc Chemicals Ltd.
    Inventors: Owen Ross Chambers, Roderic Nigel Fraser Simpson
  • Patent number: 5739367
    Abstract: A process for preparing a cobalt (III) complex is described which comprises: (i) treating a divalent cobalt salt of formula Co.sup.II X.sub.2/n where n is the valency of an anion X, with up to 15 molar equivalents of ammonia or an amine; (ii) oxidizing the resulting amine complex; (iii) converting the oxidized complex to the corresponding carboxylate of formula ?Co.sup.III (NR.sub.3).sub.5 R.sup.1 COO!X.sub.2/n where each R, which may be the same or different, represents hydrogen or an optionally substituted hydrocarbon group and R.sup.1 represents an alkyl or alkenyl group of 1 to 18 carbon atoms, at a pH above 8.5; and optionally (iv) replacing the X ion by a different anion by a metathetical reaction.
    Type: Grant
    Filed: July 21, 1997
    Date of Patent: April 14, 1998
    Assignee: Rhone-Poulenc Chemicals Ltd.
    Inventors: John Frederick Carr, Derek Pakenham
  • Patent number: 5276172
    Abstract: Metal organic compounds comprising three atoms of cobalt, nickel or bismuth each linked through oxygen atoms to boron or phosphorus and comprising a combination of aliphatic and aromatic carboxylic acid residues are useful as adhesion promoters to promote the adhesion of brass-coated steel to vulcanised rubber.
    Type: Grant
    Filed: July 9, 1991
    Date of Patent: January 4, 1994
    Assignee: Rhone-Poulenc Chemicals Ltd.
    Inventors: Philip E. R. Tate, John W. Prince, John M. Hilton