Patents Represented by Attorney, Agent or Law Firm Lyndanne M. Whalen
  • Polyisocyanates containing ether and urethane groups, a process for their preparation and their use in the production of polyurethane lacquers
    Patent number: 5747628
    Abstract: Polyisocyanates based on polyhydroxy polyethers and tolylene diisocyanate containing ether and urethane groups and having an isocyanate group content of from 11.8 to 14.4% by weight, an average isocyanate functionality of from 3.1 to 4.0 and a free tolylene diisocyanate content of less than 0.1% by weight are produced by reacting a polyhydroxy polyether having a molecular weight in the range of from about 350 to about 500 with excess quantities of tolylene diisocyanate and subsequently distilling the mixture to remove unreacted excess of the starting diisocyanate. These polyisocyanates are particularly useful in the production of polyurethane lacquers.
    Type: Grant
    Filed: December 2, 1992
    Date of Patent: May 5, 1998
    Assignee: Bayer Aktiengesellschaft
    Inventors: Lutz Schmalstieg, Hermann Gruber, Bernd Riberi, Klaus Nachtkamp
  • Process for the production of diurethanes and their use for the production of diisocyanates
    Patent number: 5744633
    Abstract: A new process for the production of high purity (cyclo)aliphatic diurethanes from (cyclo)aliphatic diamines, alcohols and urea in a multistep reaction in which (1) urea is reacted with alcohol with elimination of ammonia, (2) diamine is then introduced into the reaction mixture, optionally in the form of a solution in alcohol, and reacted with continuous release of ammonia and (3) the reaction mixture is freed from volatile components by distillation. The diurethanes produced by this process are useful as starting materials for the production of the corresponding diisocyanates by thermal urethane cleavage.
    Type: Grant
    Filed: December 2, 1994
    Date of Patent: April 28, 1998
    Assignee: Bayer Aktiengesellschaft
    Inventors: Oswald Wilmes, Eberhard Konig, Klaus Nachtkamp, Ernst Kysela
  • Process for the production of secondary amines and the amines produced by the process
    Patent number: 5739397
    Abstract: Secondary amines having a hydrocarbon backbone, a functionality of at least 1 and a molecular weight of at least 74 are produced by reacting a hydrocarbon containing a leaving group with a primary amine, primary diamine, primary polyamine or ammonia at a temperature of from about 70.degree. to 250.degree. C.
    Type: Grant
    Filed: May 30, 1996
    Date of Patent: April 14, 1998
    Assignee: Bayer Corporation
    Inventors: Rick L. Adkins, William E. Slack
  • Hexamethylene diisocyanate residue-based compositions as fillers for polyisocyanates
    Patent number: 5739207
    Abstract: Urethane-filled polyisocyanates are produced by (a) reacting a hexamethylene diisocyanate-containing residue having less than 10% by weight monomeric hexamethylene diisocyanate and a total NCO content of at least 25% with an alcohol containing at least one ether linkage in an equivalent ratio of isocyanate to hydroxyl groups of from about 0.9:1 to about 1.0:0.9 and (b) dissolving the product of (a) in a polyisocyanate. These urethane-filled polyisocyanates are particularly useful in the production of polyurethanes.
    Type: Grant
    Filed: December 27, 1996
    Date of Patent: April 14, 1998
    Assignee: Bayer Corporation
    Inventor: William E. Slack
  • Process for the separation of high-boiling materials from the reaction mixture generated during the production of diaminotoluene
    Patent number: 5728880
    Abstract: Amine mixtures generated during the production of diaminotoluene by hydrogenating dinitrated aromatic compounds are treated to separate high boiling materials from the desired amine products. In this process, any water of reaction and any solvent are first removed from the diaminotoluene isomer mixture (TDA mixture). The low-boiling TDA isomers are then separated using a TDA isomer distillation column. In the process of the present invention, the bottom phase remaining after the initial distillation contains a mixture of m-TDA and high-boiling materials. This bottom phase is separated and concentrated until the high-boiling material content is from approximately 25 to 60 wt. %. This concentrated bottom phase is then mixed with o-TDA in a ratio of 1:1 to 1:5 and a m-/o-TDA mixture is removed by distillation. The m-/o-TDA mixture thus recovered is then returned to the TDA isomer distillation column.
    Type: Grant
    Filed: February 25, 1997
    Date of Patent: March 17, 1998
    Assignee: Bayer Aktiengesellschaft
    Inventors: Heiko Beckhaus, Harro Witt, Uwe-Jens Zarnack, Gerd Greger
  • Liquid amines
    Patent number: 5723670
    Abstract: Amines which are solid at ambient temperature and pressure are liquified by reacting those amines with a derivatizing agent represented by the formula XY in which X represents a halide or sulfonate group and Y represents an alkyl group, a cycloalkyl group, an alkoxyalkyl group or an aryl group. The amine and derivatizing agent are reacted at temperatures of from about 50.degree. to about 250.degree. C. in amounts such that the molar ratio of derivatizing agent to amine groups is from about 0.25:1 to 8:1.
    Type: Grant
    Filed: June 18, 1996
    Date of Patent: March 3, 1998
    Assignee: Bayer Corporation
    Inventors: Rick L. Adkins, William E. Slack
  • Azeotrope-like compositions of dimethoxymethane, cyclopentane and 2-methyl pentane and the use thereof in the production of foams
    Patent number: 5723509
    Abstract: Azeotropic compositions made up of from about 68.1 to about 69.1% by weight of dimethoxymethane, from about 29.7 to about 30.7% by weight of cyclopentane and from about 0.7 to about 1.7% by weight in which the sum of the weight percents of the components is 100% by weight. These azeotrope-like compositions are useful as blowing agents in the production of polyurethane foams.
    Type: Grant
    Filed: September 23, 1996
    Date of Patent: March 3, 1998
    Assignee: Bayer Corporation
    Inventors: Joachim Werner, Scott A. Kane, Herman P. Doerge, Eric F. Boonstra, Charles E. Mortimer
  • Azeotrope-like compositions of 1,1,1,3,3 pentafluoropropane and tetramethylsilane
    Patent number: 5716541
    Abstract: Azeotropic compositions made up of from about 60 to about 78% by weight of 1,1,1,3,3-pentafluoropropane and from about 22 to about 40% by weight of tetramethylsilane have been found to be particularly useful as blowing agents for the production of polyurethane foams.
    Type: Grant
    Filed: September 23, 1996
    Date of Patent: February 10, 1998
    Assignee: Bayer Corporation
    Inventors: Joachim Werner, Scott A. Kane, Charles E. Mortimer, Herman P. Doerge, Eric F. Boonstra
  • Tertiary amines having carbonate and urethane groups
    Patent number: 5705672
    Abstract: Tertiary amines having carbonate and urethane groups and optionally hydroxyl groups are produced by reacting a) a polyhydric alcohol and b) a primary-tertiary diamine with c) a carbonic acid derivative selected from the group consisting of optionally cyclic carbonates, urea, phosgene and bis-chlorocarbonates of alcohols of the same type as those used as component a). This reaction may be carried out in one or two steps. The tertiary amines produced by this process are useful as catalysts, which may optionally be incorporated into an isocyanate-reactive material, in the isocyanate addition reaction for the production of polyurethane plastics. These tertiary amines are particularly useful for the production of foam backed plastic films.
    Type: Grant
    Filed: August 3, 1995
    Date of Patent: January 6, 1998
    Assignee: Bayer Aktiengesellschaft
    Inventors: Klaus Konig, Ulrich Liman, Josef Sanders
  • Process for the production of open-celled rigid polyurethane foams useful as insulating materials
    Patent number: 5698601
    Abstract: Completely open-celled rigid polyurethane foams are produced by subjecting closed-celled or partially closed-celled rigid polyurethane foams to applied external pressure. These open-celled foams are useful as filling material in insulating panels or as insulating foams.
    Type: Grant
    Filed: April 19, 1996
    Date of Patent: December 16, 1997
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rainer Welte, Hans-Joachim Scholl
  • Process for the production of nitroaromatic compounds
    Patent number: 5696305
    Abstract: Nitroaromatic compounds are produced by continuously reacting an aromatic compound with nitrating acid. The reaction mixture is separated into an organic phase from which the desired nitroaromatic compound is recovered and an acid phase. The acid phase is subjected to flash evaporation to remove at least 5% by weight of the water present therein. The vapors generated during the flash evaporation are introduced into a jet spray of coolant to produce a condensate made up coolant, condensed vapors and suspended organic compounds. A portion of the condensate is subjected to phase separation to remove water and organic compounds present therein. The water and organic compounds may be reused. The process of the present invention is particularly advantageous in that deposits which block pipelines and interfere with heat transfer are not generated.
    Type: Grant
    Filed: August 3, 1995
    Date of Patent: December 9, 1997
    Assignee: Bayer Aktiengesellschaft
    Inventors: Uwe Klingler, Thomas Schieb, Gerhard Wiechers, Jurgen Zimmermann
  • Polyether polyols stabilized with tocopherol
    Patent number: 5695689
    Abstract: .alpha.- and/or .beta.-tocopherol (vitamin E), optionally in combination with octylated diphenylamines, is combined with a polyether polyol having a molecular weight of from about 300 to about 10,000 to stabilize that polyether polyol. Polyether polyols which are stabilized in this manner are particularly useful in the production of polyurethanes and polyurethane foams with a reduced tendency toward discoloration.
    Type: Grant
    Filed: September 20, 1995
    Date of Patent: December 9, 1997
    Assignee: Bayer Aktiengesellschaft
    Inventors: Pramod Gupta, Hansjurgen Rabe
  • Foam-forming mixtures with decreased decomposition of hydrohalocarbon blowing agents
    Patent number: 5693686
    Abstract: A polyisocyanate having an acid value of at least 0.01% HCl is used to produce polyisocyanate, polyisocyanurate and polyurethane urea foams with an HCFC blowing agent. The use of such a polyisocyanate is advantageous because the polyisocyanate does not cause significant decomposition of the HCFC blowing agent.
    Type: Grant
    Filed: February 10, 1994
    Date of Patent: December 2, 1997
    Assignee: Bayer Corporation
    Inventors: John F. Szabat, Charles E. Mortimer, Joseph M. Sutej, Jeanne L. Beaumont, Steven L. Schilling, Harold R. Parsons, Robert P. Yeater
  • Process for the production of secondary amine terminated polyethers
    Patent number: 5693864
    Abstract: Disclosed herein is a process for preparing an amine terminated polyether comprising reacting a polyether containing a leaving group with a primary amine or ammonia at a temperature of about 70 to 250 degrees Centigrade.
    Type: Grant
    Filed: October 7, 1992
    Date of Patent: December 2, 1997
    Assignee: Bayer Corporation
    Inventors: William E. Slack, Rick L. Adkins, Hans Georg Schmelzer
  • Process for the production of dinitrotoluene
    Patent number: 5689018
    Abstract: Dinitrotoluene is produced from toluene and nitric acid in the presence of sulfuric acid in a two stage process in the first stage, toluene and nitric acid are reacted under isothermal conditions in amounts such that mononitrotoluene is produced. The reaction mixture is then separated into an organic phase and an acid phase. The organic phase is then further reacted with nitric acid under adiabatic conditions to produce dinitrotoluene. The reaction mixture is then separated into an organic phase and an acid phase. Dinitrotoluene is recovered from the organic phase. After at least 5% by weight water is removed from the acid phase and sufficient nitric acid to replace that consumed during the nitration reaction has been added, the acid phase may be recycled.
    Type: Grant
    Filed: August 3, 1995
    Date of Patent: November 18, 1997
    Assignee: Bayer Aktiengesellschaft
    Inventors: Uwe Klingler, Thomas Schieb, Gerhard Wiechers, Jurgen Zimmermann
  • Process for the manufacture of aromatic amines by gas-phase hydrogenation and catalyst useful thereof
    Patent number: 5679858
    Abstract: Aromatic amines are produced by catalytic hydrogenation of nitroaromatic compounds in the gas phase. The catalyst includes palladium and lead on graphite or on a graphite-containing coke support. From 30 to 6000 equivalents of hydrogen for each equivalent of nitro groups are contacted with the catalyst during this process.
    Type: Grant
    Filed: June 6, 1996
    Date of Patent: October 21, 1997
    Assignee: Bayer Aktiengesellschaft
    Inventors: Reinhard Langer, Hans-Josef Buysch, Ursula Pentling
  • Process for the production of dinitrotoluene
    Patent number: 5679873
    Abstract: Dinitrotoluene is produced in a two-stage process from toluene and nitric acid in the presence of sulfuric acid under adiabatic conditions in the presence of nitrating acids made up of specified components. The reaction product of the first phase is separated into an acid phase and an organic phase containing the mononitrotoluene. Some water is removed from the acid phase, nitric acid is added and the resultant mixture is recycled. The organic phase containing mononitrotoluene is further nitrated to produce the dinitrotoluene. This nitration mixture is also separated into an acid phase and an organic phase. The acid phase is treated to remove some water, nitric acid is added and the resultant acid mixture is recycled. Dinitrotoluene is recovered from the organic phase. This process is advantageous in that dilute nitric acid may be used and the heat of the nitration reaction is utilized.
    Type: Grant
    Filed: August 3, 1995
    Date of Patent: October 21, 1997
    Assignee: Bayer Aktiengesellschaft
    Inventors: Uwe Klingler, Thomas Schieb, Gerhard Wiechers, Jurgen Zimmermann
  • Method for reducing the viscosity of high viscosity polyether polyols
    Patent number: 5672761
    Abstract: The viscosity of polyether polyols characterized by functionalities greater than or equal to 1, viscosities greater than 500 mPa.multidot.s at 25.degree. C. and at least 20% terminal secondary hydroxyl groups is reduced by converting at least one terminal hydroxyl group of the polyether to a leaving group and then reacting the conversion product with a primary amine or ammonia at a temperature of from about 70.degree. to 250.degree. C.
    Type: Grant
    Filed: May 2, 1996
    Date of Patent: September 30, 1997
    Assignee: Bayer Corporation
    Inventors: Rick L. Adkins, William E. Slack
  • Azeotropic compositions of dimethoxymethane and cyclopentane and the use thereof in the production of foams
    Patent number: 5665788
    Abstract: An azeotropic composition made up of from about 58 to about 77% by weight of dimethoxymethane and from about 23 to about 42% by weight of cyclopentane is used as a blowing agent in a process for the production of polyurethane foams.
    Type: Grant
    Filed: November 1, 1996
    Date of Patent: September 9, 1997
    Assignee: Bayer Corporation
    Inventors: Joachim Werner, Scott A. Kane, Herman P. Doerge, Eric F. Boonstra
  • Process for the production of dinitrotoluene and isomeric mixtures of dinitrotoluene
    Patent number: 5663462
    Abstract: Dinitrotoluene and isomer mixtures of dinitrotoluene are produced in a single stage, continuous process by nitrating mononitrotoluene or an isomer mixture of mononitrotoluene in which the ortho-mononitrotoluene content is low with a nitrating acid made up of (1) from about 80 to about 100 wt. % inorganic constituents and (2) up to 20 wt. % organic constituents. The inorganic constituents of the nitrating acid include: (a) from about 60 to about 90 wt. % sulfuric acid, (b) from about 1 to about 20 wt. % nitric acid, and (c) at least 5 wt. % water. The organic constituents of the nitrating acid include: from about 70 to about 100% by weight nitrotoluene isomers and up to about 30% by weight nitration by-products. The nitration reaction is carrier out under adiabatic conditions. The molar ratio of nitric acid to mononitrotoluene during the nitration reaction is generally from about 0.7:1 to about 1.4:1.
    Type: Grant
    Filed: June 4, 1996
    Date of Patent: September 2, 1997
    Assignee: Bayer Aktiengesellschaft
    Inventors: Uwe Klingler, Thomas Schieb, Gerhard Wiechers