Patents by Inventor Genevieve Le Brasseur

Genevieve Le Brasseur 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).

  • Modified copolymers of ethylene and .alpha.-olefins and a process for their preparation
    Patent number: 4486579
    Abstract: A modified copolymer of ethylene and of at least one .alpha.-olefin having from 3 to 12 carbon atoms, comprising from 0.5 to 10 mole percent of units derived from the .alpha.-olefin, wherein the measured limiting viscosity of the copolymer is between 1.5 and 10 times the limiting viscosity of the copolymer calculated from the molecular weight distribution of the copolymer. Process for producing these copolymers employing at least one free-radical initiator.
    Type: Grant
    Filed: December 27, 1982
    Date of Patent: December 4, 1984
    Assignee: Societe Chimique des Charbonnages
    Inventors: Jean-Pierre Machon, Genevieve Le Brasseur, Jean-Claude Decroix, Marius Hert
  • Halogenated catalyst for ethylene polymerization containing a transition metal and magnesium and process for its preparation
    Patent number: 4465781
    Abstract: A halogen-containing catalyst for the polymerization of ethylene or copolymerization of ethylene and .alpha.-olefins having from 3 to 8 carbon atoms and a process for their preparation. The catalyst has the general formula: M.sub.n Mg(OR).sub.2-m X.sub.m+4n, wherein M is a metal of groups IVa to VIa of the Periodic Tables, X is a halogen, R is an alkyl radical containing from 1 to 4 carbon atoms, 0<m<2, and 0.05<n<1.
    Type: Grant
    Filed: July 19, 1982
    Date of Patent: August 14, 1984
    Assignee: Societe Chimique des Charbonnages-CdF Chimie
    Inventor: Genevieve Le Brasseur
  • Ethylene polymerization catalyst and a process for its preparation
    Patent number: 4420417
    Abstract: An ethylene polymerization catalyst having the general formula M.sub.n Mg(OR).sub.2+4n-m X.sub.m, wherein R is an alkyl radical containing from 1 to 4 carbon atoms, M is a transition metal of groups IVa to VIa of the Periodic Table, X is a halogen, 0.05.ltoreq.n.ltoreq.0.6 and 0<m<n+1.
    Type: Grant
    Filed: July 29, 1982
    Date of Patent: December 13, 1983
    Assignee: Societe Chimique des Charbonnages-CdF Chimie
    Inventor: Genevieve Le Brasseur
  • Process for removing catalyst residues from polyolefins
    Patent number: 4142039
    Abstract: In purifying polyolefins obtained by suspension polymerization to remove catalyst residues therefrom, the polymer is first separated from the polymerization medium and then degassed in the absence of air. Next the degassed polymer is deactivated by suspension in a liquid medium comprising a liquid hydrocarbon, an aliphatic alcohol having 1 to 4 C atoms, and an organic chloride which is an acid chloride or an alkyl chloride, the suspension being at a temperature of +30, +65.degree. C. Finally the deactivated polymer is separated from the liquid medium and washed with an aliphatic alcohol and/or a liquid hydrocarbon.
    Type: Grant
    Filed: July 6, 1977
    Date of Patent: February 27, 1979
    Assignee: Societe Chimique des Charbonnages CdF Chimie
    Inventor: Genevieve Le Brasseur
  • Photodegradable polymer compositions
    Patent number: 4028480
    Abstract: Photodegradable polyethylene or polystyrene compositions of copolymers thereof containing up to 500 ppm of iron in the form of a ferrous carboxylic acid salt having a substituted alkyl chain of at least 6 carbon atoms.
    Type: Grant
    Filed: April 15, 1976
    Date of Patent: June 7, 1977
    Assignee: Societe Chimique des Charbonnages - CdF Chimie
    Inventor: Genevieve Le Brasseur