Patents Assigned to Hoechst Celanese
  • Organometallic catalysts for epoxidizing prochiral olefins and a new class of amid-salicylidene ligands
    Patent number: 5602267
    Abstract: Asymmetric synthesis using a novel catalyst comprising the formula: ##STR1## and which has utility in areas such as epoxidation of olefins.
    Type: Grant
    Filed: May 26, 1995
    Date of Patent: February 11, 1997
    Assignee: Hoechst Celanese
    Inventor: Shu-Hai Zhao
  • Method for the preparation of arylalkanolamineacylates
    Patent number: 5338884
    Abstract: Acylamides or amine acylate salts of arylalkanolamines are prepared by reacting an arylisonitrosoalkanone with hydrogen and a carboxylic acid, carboxylic acid anhydride or carboxylic acid ester or mixture thereof in the presence of a transition metal catalyst; optionally the product is converted to the corresponding arylalkanolamine hydrochloride salt by reaction of the acylamide or amine acylate salt of the arylalkanolamine with hydrogen chloride in a C.sub.1 -C.sub.3 alkyl alcohol.
    Type: Grant
    Filed: October 2, 1992
    Date of Patent: August 16, 1994
    Assignee: Hoechst Celanese
    Inventors: Ahmed M. Tafesh, Olan S. Fruchey, Charles B. Hilton
  • Thermoplastic polyester compositions containing certain low molecular weight diepoxide resins and having improved impact behavior
    Patent number: 4880866
    Abstract: Novel thermoplastic polyester compositions having improved impact behavior are produced. These compositions comprise a blend of poly (C.sub.2 -C.sub.4 alkylene terephthalate) with certain low molecular weight diepoxide resins, a triphenyl phosphonium halide catalyst, and a multiphase composite polymer. The multiphase polymer has a first elastomeric phase polymerized from a monomer system including butadiene or butadiene/styrene and a final rigid thermoplastic phase polymerized in the presence of the elastomeric phase.
    Type: Grant
    Filed: June 17, 1987
    Date of Patent: November 14, 1989
    Assignee: Hoechst Celanese
    Inventors: Donal McNally, H. Leslie LaNieve, Jerome L. Costanzo
  • Characterization of semiconductor resist material during processing
    Patent number: 4874240
    Abstract: Several methods for evaluating certain changes induced in a film of semiconductor resist material after the coat process and before or at completion of the softbake process, by monitoring thickness of and absorption by a film of resist material.
    Type: Grant
    Filed: March 1, 1988
    Date of Patent: October 17, 1989
    Assignee: Hoechst Celanese
    Inventors: Michael P. C. Watts, Thiloma I. Perera, David W. Myers, Robert G. Ozarski, John F. Schipper, Raul V. Tan
  • Process for the production of 3-mono or 3,5-disubstituted-4-acetoxystyrene its polymerization, and hydrolysis
    Patent number: 4868256
    Abstract: The present invention relates to a process for the production of 3-mono or 3,5-disubstituted-4-acetoxystyrene wherein the 3- or 3,5-substitution is independently C.sub.1 to C.sub.10 alkyl, chlorine, bromine, iodine, --NO.sub.2, --NH.sub.2, or --SO.sub.3 H, a process for its polymerization, hydrolysis, and use in a variety of compositions.
    Type: Grant
    Filed: August 2, 1988
    Date of Patent: September 19, 1989
    Assignee: Hoechst Celanese
    Inventors: Mohammad Aslam, Richard Vicari, Ralph Dammel, Juergen Lingnau, Karl-Friedrich Doessel
  • Surface or electrically active copolymers of poly(4-substituted styrene/N-substituted maleimide)
    Patent number: 4847327
    Abstract: A surface or electrically active material comprising an alternating copolymer having the formula ##STR1## wherein X and Y oppositely consist of an electron accepting and an electron donating group or a hydrophobic group and an ionic or non-ionic hydrophilic group.
    Type: Grant
    Filed: January 7, 1988
    Date of Patent: July 11, 1989
    Assignee: Hoechst Celanese
    Inventors: Raymond W. Rupp, Richard Vicari, Donna L. Keene