Patents by Inventor Bertha Croitoru

Bertha Croitoru 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).

  • Poly (pentabromobenzyl acrylate) having specific properties
    Patent number: 9493584
    Abstract: Poly (pentabromobenzyl acrylate) having weight average molecular weight (Mw) in the range from 4,000 to 120,000 and polydispersity index of less than 10 as determined by high temperature gel permeation chromatography, wherein the glass transition temperature of the poly (pentabromobenzyl acrylate) is not more than 150 C.°, the poly (pentabromobenzyl acrylate) includes chains which are terminated by an end group derived from a chain length regulator, wherein the end group is a thiol group —SR1, and wherein R1, is a linear or branched alkyl group composed of not less than 8 carbon atom.
    Type: Grant
    Filed: October 17, 2013
    Date of Patent: November 15, 2016
    Assignee: BROMINE COMPOUNDS LTD.
    Inventors: Bertha Croitoru, Dov Beruben, Michael Peled, Yaakov Rachmilevitch, Yaniv Hirschsohn, Yelena Epshtein Assor, Ella Rapaport, Dan Kopel
  • PROCESS FOR THE POLYMERIZATION OF DIACRYLATE-SUBSTITUTED HALOGENATED AROMATIC MONOMERS
    Publication number: 20160311948
    Abstract: The invention relates to the free radical polymerization of tetrahalogen xylylene diacrylates monomers, either in a mixture of water-miscible aprotic solvent and water, or in a water-immiscible solvent, in the presence of a chain length modifier.
    Type: Application
    Filed: April 25, 2016
    Publication date: October 27, 2016
    Applicant: BROMINE COMPOUNDS LTD.
    Inventors: Dov BERUBEN, Edith YA'ARI, Bertha CROITORU, Michael PELED
  • PROCESS FOR THE POLYMERIZATION OF PENTABROMOBENZYL (METH) ACRYLATE, THE POLYMER OBTAINED AND USES THEREOF
    Publication number: 20150259440
    Abstract: The invention provides a solution polymerization process, comprising polymerizing pentabromobenzyl acrylate or pentabromobenzyl methacrylate in a mixture of water-miscible aprotic solvent and water, in the presence of a water-soluble free radical initiator and preferably also chain length regulator. The polymers obtained and their uses as flame retardants in polypropylene, HIPS, ABS and textile products are also disclosed.
    Type: Application
    Filed: October 17, 2013
    Publication date: September 17, 2015
    Inventors: Bertha Croitoru, Dov Beruben, Michael Peled, Yaakov Rachmilevitch, Yaniv Hirschsohn, Yelena Epshtein Assor, Ella Rapaport, Dan Kopel
  • Process for electrophilic aromatic substitution
    Patent number: 6399835
    Abstract: Processes for the electrophilic substitution of aromatic compounds, such as alkylation, with a desired substituent are disclosed. The processes include contacting the aromatic compound, a precursor of the desired substituent and an aqueous reagent containing zinc halide at elevated temperatures such as above 50° C.
    Type: Grant
    Filed: April 6, 2000
    Date of Patent: June 4, 2002
    Assignee: Bromine Compounds Ltd.
    Inventors: Ariel Ewenson, David Itzhak, Miriam Freiberg Bergstein, Asher Shushan, Bertha Croitoru, David Beneish, Naim Faza
  • Process for the preparation of octyl p-methoxy cinnamate
    Patent number: 5728865
    Abstract: A process for the preparation of octyl p-methoxy cinnamate is provided. The procedure generally concerns reacting p-bromo anisole with acrylic acid; and esterifying the resulting product with 2-ethyl hexanol. Preferred reactants and conditions are provided.
    Type: Grant
    Filed: August 20, 1996
    Date of Patent: March 17, 1998
    Assignee: Bromine Compounds Ltd.
    Inventors: Ariel Ewenson, Bertha Croitoru, Asher Shushan
  • Method of production of biaryl derivatives
    Patent number: 5177258
    Abstract: Biaryl derivatives are produced by coupling an aryl halide in an aqueous alkaline solution in the presence of a palladium catalyst, using formic hydrazide as the reducing agent.
    Type: Grant
    Filed: May 21, 1992
    Date of Patent: January 5, 1993
    Assignee: Bromine Compounds, Ltd.
    Inventors: Abram Becker, Ariel A. Ewenson, Bertha Croitoru