Patents Assigned to Sotra Industries
  • Process for cross-linking chlorinated (CO)polymers, cross-linkable compositions and shaped objects
    Patent number: 5395887
    Abstract: A method for cross-linking chlorinated (co)polymers involves reacting such (co)polymers at between 50.degree. and 230.degree. C. in the absence of solvent with an organometallic amino-type derivative of tin, lead, antimony or bismuth to provide cross-linked compositions and shaped objects.
    Type: Grant
    Filed: October 28, 1991
    Date of Patent: March 7, 1995
    Assignees: Centre National de la Recherche Scientifique, Sotra Industries
    Inventors: Christian Gondard, Alain Michel
  • Process for grafting functions onto chlorinated (co)polymers, compositions and shaped objects
    Patent number: 5266637
    Abstract: The present invention relates to functionalized chlorinated (co)polymers and methods for their preparation. The functionalization is performed with an organometallic compound where the metal may be tin, lead, antimony or bismuth. The organic groups are hydrocarbons which may be substituted and one group is either a secondary amine or an ether which is eventually substituted by a trialkoxysilane or a hydroxy group. The preferred chlorinated polymer is PVC and the preferred functionalizing agent is an organotin compound.
    Type: Grant
    Filed: October 28, 1991
    Date of Patent: November 30, 1993
    Assignees: Centre National de la Recherche Scientifique, Sotra Industries
    Inventors: Christian Gondard, Alain Michel
  • (Co)polymer cross linking process, cross-linked compositions, uses and shaped objects
    Patent number: 5244982
    Abstract: Method for crosslinking (co)polymers comprising chlorine, ester, NH or carbonate groupings, according to which said (co)polymer is reacted at between 100.degree. and 300.degree. C., and without the presence of a solvent, with a tin-, lead-, bismuth- or antimony-based organometallic alcoholate. Mixtures, crosslinkable compositions and shaped objects are also described.
    Type: Grant
    Filed: December 28, 1990
    Date of Patent: September 14, 1993
    Assignees: Centre National de la Recherche Scientifique, Sotra Industries
    Inventors: Christian Gondard, Alain Michel
  • Process for cross-linking esterified (co)polymers
    Patent number: 5219949
    Abstract: A process for cross-linking (co)polymers having ester functions involves reacting a polyalcohol-derived polyester and a polyacid-derived polyester in the presence of an alkaline alcoholate at a temperature in excess of 180.degree. C.
    Type: Grant
    Filed: December 13, 1991
    Date of Patent: June 15, 1993
    Assignees: Centre National de la Recherche Scientifique, Sotra Industries
    Inventors: Christian Gondard, Alain Michel