Patents Represented by Attorney Lawrence S. Pope

Find this attorney in the Justia Lawyer Directory

  • Copolycarbonates prepared with 2,2'-bis(p-hydroxyphenyl) 1,1,1,3,3,3-hexafluoropropane
    Patent number: 4346211
    Abstract: Copolycarbonate resins are prepared from an aromatic diol and a carbonic acid derivative. 2,2-bis(p-hydroxy-phenyl) 1,1,1,3,3,3-hexafluoropropane is co-reacted in a minor amount with the aromatic diol and carbonic acid derivative to form a polycarbonate having improved heat distortion characteristics.
    Type: Grant
    Filed: October 6, 1980
    Date of Patent: August 24, 1982
    Assignee: Mobay Chemical Corporation
    Inventors: Sivaram Krishnan, Arthur L. Baron
  • Process for the preparation of polycarbonates catalyzed by cyclic aza compounds
    Patent number: 4346210
    Abstract: The present invention relates to a process for the preparation of aromatic polycarbonates from diphenols by the phase boundary process, which is characterized in that cyclic, preferably monocyclic or bicyclic, aza compounds are used as catalysts. The present invention also relates to the polycarbonates obtainable according to the process, which are distinguished by high light transmission and a low tendency to yellowing, even after relatively severe exposure to heat.
    Type: Grant
    Filed: October 26, 1979
    Date of Patent: August 24, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Alewelt, Dieter Margotte, Claus Wulff, Hugo Vernaleken
  • Novel method for reducing the processing temperature of thermoplastic polymers and novel blowing agent concentrates produced thereby
    Patent number: 4343912
    Abstract: The present invention pertains to a method for reducing the processing temperature of a thermoplastic polymer comprising blending the thermoplastic polymer in powder form with an effective amount of a compound having a softening temperature of about 20.degree. to 200.degree. C. lower than the softening temperature of the thermoplastic polymer. The invention further pertains to novel chemical blowing agent concentrates.
    Type: Grant
    Filed: September 21, 1981
    Date of Patent: August 10, 1982
    Assignee: Mobay Chemical Corporation
    Inventor: In C. Lim
  • Process for the production of cast films from polyaryl sulphone/polycarbonate mixtures
    Patent number: 4343756
    Abstract: Mixtures of polyaryl sulphones and polycarbonates solutions made stable by the introduction of solubilizing agents are used to prepare cast films of improved properties.
    Type: Grant
    Filed: November 17, 1980
    Date of Patent: August 10, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans-Leo Weber, Eckart Reese, Hans Kaloff, Hans-Josef Fausten
  • Use of organic silicon compounds in combination with oxetane compounds, dioxanes or tetrahydrofuranes for stabilizing and brightening polycarbonates which are free from phosphites and free from boric acid esters
    Patent number: 4342681
    Abstract: The present invention relates to polycarbonate composition characterized in the absence therefrom of phosphites and boric acid esters which compositions are made stable and bright by the incorporation of organic silicon compounds in combination with oxetane, dioxane or tetrahydrofurane compounds.
    Type: Grant
    Filed: May 12, 1980
    Date of Patent: August 3, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventors: Karsten Idel, Wolfgang Cohnen, Dieter Freitag
  • Levelling agent and process of levelling for the disperse dyeing of hydrophobic materials
    Patent number: 4341526
    Abstract: The present invention involves an improved levelling agent and a method of using it in the disperse dyeing of hydrophobic synthetic fiber materials such as polyesters and polyamides. The levelling agent enhances dye migration without substantially accelerating the exhaustion of dye onto the fabric being dyed. It is based on diaryl ethers such as ditolyl ether mixed with emulsifiers and optionally a diluent which is water or an organic solvent.It also involves a process for improving the levelness of already dyed materials by subjecting them to temperatures above the boiling point of water in the presence of diaryl ether based levelling agents.
    Type: Grant
    Filed: August 30, 1977
    Date of Patent: July 27, 1982
    Assignee: Mobay Chemical Corporation
    Inventors: Rolf G. Kuehni, Thomas C. Cox
  • Process for the preparation of polyisocyanates containing biuret and/or higher polyuret groups and use thereof as synthesis component in the preparation of polyurethane plastics
    Patent number: 4340712
    Abstract: A process for the preparation of polyisocyanates containing biuret and/or higher polyuret groups by reacting secondary diamines with diisocyanates characterized in that the reaction is carried out in the presence of catalytic quantities of strong acids which form mixed carbamic acid anhydrides with isocyanates. Alternatively, the secondary diamines may be reacted with organic diisocyanates in the absence of catalysts to form a urea diisocyanate which is then reacted in the presence of catalytic quantities of strong acids which form mixed carbamic acid anhydrides either with the same diisocyanate used in the first step or a second diisocyanate. The invention also relates to the polyisocyanates containing biuret and/or higher polyuret groups obtainable by this process.
    Type: Grant
    Filed: December 19, 1979
    Date of Patent: July 20, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Reichmann, Klaus Konig, Manfred Schonfelder
  • Process for working up polycarbonates
    Patent number: 4338429
    Abstract: The present invention relates to a process for working up alkaline two-phase mixtures which have been obtained in the synthesis of polycarbonates by the two-phase boundary process, characterized in that for the separation of the alkaline two-phase mixture into an organic phase and an aqueous phase, the mixture is supplied with shearing energy and/or added are one or more cationic emulsifying agents and/or dispersing agents and/or in that, for the separation of the acidified two-phase mixture into an organic phase and an aqueous phase, the mixture is supplied with shearing energy and/or added are one or more cationic emulsifying agents and/or dispersing agents and/or in that the organic phase which was separated off after the acidification is washed with water to which one or more water-soluble, organic anionic compounds have been added.
    Type: Grant
    Filed: July 7, 1980
    Date of Patent: July 6, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventors: Volker Serini, John Goossens, Ludwig Bottenbruch, Dieter Freitag
  • Process for the preparation of neopentyl glycol polyesters and co-polyesters
    Patent number: 4338431
    Abstract: The present invention relates to an improved process for the preparation of neopentyl glycol polyesters by reacting neopentyl glycol with carboxylic acids or derivatives thereof in the presence of minor amounts of glycols which boil at lower temperatures than neopentyl glycol. These low-boiling glycols obviate previous difficulties relating to the sublimation of neopentyl glycol. Thus, the present process offers safety advantages since neopentyl glycol does not crystallize in the reaction apparatus and also provides better control over the molecular ratio of acid groups to alcohol groups.
    Type: Grant
    Filed: February 15, 1980
    Date of Patent: July 6, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventors: Klaus Konig, Wolfgang Reichmann, Manfred Schonfelder
  • Thermoplastic compositions, process for their preparation and their use
    Patent number: 4336348
    Abstract: This disclosure is concerned with an improved process for preparing polymer blends by synthesizing a polyester by the phase boundary condensation synthesis wherein a preformed polymer is dissolved in the organic solvent phase of the synthesis system. This polymer is inert to the diphenol acid chloride and alkali used to form the polyester and differs from this polyester by at least molecular weight and may differ from it in chemical identity. This disclosure is also concerned with the polymer blends so obtained which display superior properties to those obtained by physically blending two already formed polymers.
    Type: Grant
    Filed: January 25, 1980
    Date of Patent: June 22, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventor: Dieter Margotte
  • Cross-linkable polycarbonate elastomers, a process for their preparation and use for packaging medicines
    Patent number: 4333809
    Abstract: The present invention is directed to cross-linkable, thermoplastically processable, segmented, high molecular weight polycarbonate elastomers, to the process for their preparation and to their use in their cross-linked form.
    Type: Grant
    Filed: July 22, 1980
    Date of Patent: June 8, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventors: Manfred Schreckenberg, Dieter Freitag, Hans-Heribert Burgdorfer, Gunther Lehnert, Siegfried Adelmann, Hans Rudolph
  • Polycarbonate/polyphosphonate thermoplastic composition
    Patent number: 4332921
    Abstract: The invention is directed to compositions comprising halogen-free aromatic polycarbonates and halogen-free aromatic polyphosphonates suitable for producing films of improved flame resistance and to processes for their preparation.
    Type: Grant
    Filed: December 29, 1980
    Date of Patent: June 1, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventors: Manfred Schmidt, Joachim Wank, Eckart Reese
  • Process for the preparation of carbonic acid esters
    Patent number: 4331610
    Abstract: The present invention relates to a process for the preparation of carbonic acid esters of mono- or polyalcohols, which is characterized in that urethanes are reacted with monoalcohols or with polyalcohols in a molar ratio of alcohol to urethane group of at least 1 to 1, in the presence of a catalyst, at reaction temperatures of between 120.degree. C. and 270.degree. C.The present invention thus also relates to a process for the preparation of oligocarbonates and of polycarbonates, which is characterized in that monourethanes or bisurethanes are reacted with primary dialcohols in a molar ratio of about 1.5:1 to about 1:1.5, together with monoalcohols, in the presence of catalysts, at reaction temperatures of between 120.degree. C. and 270.degree. C.
    Type: Grant
    Filed: January 17, 1980
    Date of Patent: May 25, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventors: Walter Heitz, Peter Ball
  • Aqueous dispersions or solutions of oligomeric or polymeric plastics, a process for their production and their use
    Patent number: 4331717
    Abstract: The present invention relates to aqueous dispersions or solutions of oligomers or polymers, polycondensates or polyaddition products containing from about 2 to 200 milliequivalents per 100 g of solids, of incorporated ammonium groups obtained by neutralizing incorporated tertiary nitrogen atoms with organic acids, characterized in that the organic acids on which the ammonium groups are based are acids which lose their acid character at temperatures in the range from about 20.degree. to 200.degree. C. in the absence of water without releasing corrosive decomposition products. The present invention further relates to a process for the production of these novel aqueous dispersions or solutions and to their use.
    Type: Grant
    Filed: June 14, 1979
    Date of Patent: May 25, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Wenzel, Walter Meckel
  • Process for the preparation of aromatic polycarbonates
    Patent number: 4330665
    Abstract: The invention is directed to a process for the preparation of polycarbonates of Mw 20,000 to 180,000 by transesterification of diphenols and carbonic acid dialkyl esters in the presence of organo-tin-IV compounds and a monophenol.
    Type: Grant
    Filed: April 21, 1981
    Date of Patent: May 18, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventors: Heinrich Krimm, Hans-Josef Buysch, Hans Rudolph
  • Process for the production of polyureas
    Patent number: 4328330
    Abstract: The present invention relates to a process for the production of polyureas by reacting organic polyisocyanates containing blocked isocyanate groups with organic compounds containing at least two primary and/or secondary amino groups in the presence of catalysts which accelerate the condensation reaction of the above-mentioned starting materials, characterized in that compounds containing at least one guanidine group corresponding to the following formula: ##STR1## are used as catalysts.
    Type: Grant
    Filed: May 4, 1981
    Date of Patent: May 4, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Wellner, Artur Botta, Hermann Gruber
  • Flame resistant, transparent polycarbonates comprising bisulfite adducts
    Patent number: 4327015
    Abstract: The invention is directed to flame-resistant, transparent aromatic polycarbonate compositions comprising polycarbonate resin and an additive amount of a member selected from the group consisting of aldehyde-bisulphite adducts and ketone-bisulphite adducts.
    Type: Grant
    Filed: May 11, 1981
    Date of Patent: April 27, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventors: Frank Druschke, Dieter Margotte, Wolfgang Cohnen, Karsten Idel
  • Process for the preparation of carbonic acid esters
    Patent number: 4327035
    Abstract: The present invention relates to a process for the preparation of carbonic acid esters of monoalcohols or polyalcohols, which is characterized in that ureas are reacted with monoalcohols or with polyalcohols in the molar ratio of at least 1:2, in the presence of a catalyst, at reaction temperatures between 120.degree. C. and 270.degree. C.Accordingly, the present invention also relates to a process for the preparation of oligocarbonates and polycarbonates, which is characterized in that ureas are reacted with primary dialcohols in the molar ratio of about 1.5:1 to about 1:1.5, together with monoalcohols, in the presence of catalysts at reaction temperatures between 120.degree. C. and 270.degree. C.
    Type: Grant
    Filed: January 17, 1980
    Date of Patent: April 27, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventors: Walter Heitz, Peter Ball
  • Process for the preparation of polyisocyanates containing isocyanurate groups and the use thereof
    Patent number: 4324879
    Abstract: The present invention is concerned with an improved process for the production of partially trimerized hexamethylene diisocyanate which yields isocyanurate isocyanates which have low viscosity and low monomer contents by the use of a quaternary ammonium hydroxide catalyst which is hydroxyalkyl substituted at its N atom.
    Type: Grant
    Filed: May 19, 1980
    Date of Patent: April 13, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventors: Manfred Bock, Josef Pedain, Walter Uerdingen
  • Esters of phosphorous acid
    Patent number: 4323501
    Abstract: Phosphites of the general formula: ##STR1## in which n.sub.1 is an integer;n.sub.2 is 0 or an integer;n.sub.3 is an integer;at least one of the groups R is an oxetane group as hereinafter defined or a hydrocarbon radical being substituted at least by one oxetane group as hereinafter defined;the remaining groups R are selected from alkyl, aralkyl, cycloalkyl, aryl and hetaryl groups; andthe group or groups Ar are the same or different at-least-divalent aromatic groups the free valencies of which are directly linked to the aromatic nuclei; anda process for their preparation.
    Type: Grant
    Filed: October 18, 1977
    Date of Patent: April 6, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventors: Erich Eimers, Dieter Margotte, Helmut Schmid, Rolf Dhein