Patents Represented by Attorney Lawrence S. Pope
  • Patent number: 4515921
    Abstract: The invention relates to thermoplastic aromatic polycarbonates which structural units are characterized by their end groups which are residues of ##STR1## and is predicated on the surprising and unexpected findings that high melt flow polycarbonates of this type are rendered improved impact performance by admixing therewith small amounts of an impact modifier.
    Type: Grant
    Filed: July 21, 1982
    Date of Patent: May 7, 1985
    Assignee: Mobay Chemical Corporation
    Inventor: Mark W. Witman
  • Patent number: 4510196
    Abstract: Polycarbonate compositions comprising an aromatic polycarbonate resin wherein dispersed are powdered sulfates, are particularly suitable for the preparation of films characterized by their low coefficient of static friction, high light transmission and virtual freedom from haze.
    Type: Grant
    Filed: September 20, 1982
    Date of Patent: April 9, 1985
    Assignee: Mobay Chemical Corporation
    Inventor: Russell P. Carter, Jr.
  • Patent number: 4506047
    Abstract: It is an object of the invention to provide a polycarbonate composition having improved mechanical properties and a process for the preparation of said composition. These objects are achieved in accordance with the present invention which teaches a blend of a polycarbonate resin and an additive amount of an aromatic bis-imide compound. The composition comprising said blend retains a surprising degree of ductility as measured by tensile elongation and yield strength and exhibits an improvement in both tensile strength and flexural modulus.
    Type: Grant
    Filed: June 6, 1983
    Date of Patent: March 19, 1985
    Assignee: Mobay Chemical Corporation
    Inventors: Mark W. Witman, Gerard E. Reinert
  • Patent number: 4506066
    Abstract: The present invention relates to high molecular weight thermoplastic hexahydro-furo-(3,2-b)-furane-3,6-diol based copolycarbonates useful as molding resins and to a method for their preparation.
    Type: Grant
    Filed: April 13, 1983
    Date of Patent: March 19, 1985
    Assignee: Bayer Aktiengesellschaft
    Inventors: Harald Medem, Manfred Schreckenberg, Rolf Dhein, Werner Nouvertne, Hans Rudolph
  • Patent number: 4503213
    Abstract: The instant invention relates to a process for the preparation of linear aromatic polycarbonate resins by the known two-phase interfacial process and is directed to the use of perfluoroalkyl sulfonamides as chain stoppers in said process and is further directed to the polycarbonate resins obtainable by the process which resins are suitable in the preparation of thermoplastic molding compositions.
    Type: Grant
    Filed: June 21, 1983
    Date of Patent: March 5, 1985
    Assignee: Bayer Aktiengesellschaft
    Inventors: Sivaram Krishnan, Dieter Neuray, Wolfgang Cohnen, Klaus Geisler
  • Patent number: 4500653
    Abstract: The present invention is directed to derivatives of azoles, their preparation and their use as chemical blowing agents for thermoplastic molding compositions. The agents of the invention are characterized in their improved compatibility with the resin wherein they are incorporated.
    Type: Grant
    Filed: September 14, 1983
    Date of Patent: February 19, 1985
    Assignee: Mobay Chemical Corporation
    Inventors: Manfred Schmidt, Mark W. Witman, Gerard E. Reinert, In C. Lim
  • Patent number: 4497947
    Abstract: The present invention is directed to an aromatic copolycarbonate molding composition comprising the reaction product of an aromatic diphenol, an aromatic sulfonyl diphenol, a dihydroxybiphenyl and a carbonic acid derivative, said composition being characterized by its improved heat deflection temperature and critical thickness.
    Type: Grant
    Filed: December 5, 1983
    Date of Patent: February 5, 1985
    Assignee: Mobay Chemical Corporation
    Inventors: John R. Sanderson, Sivaram Krishnan
  • Patent number: 4493734
    Abstract: Process for the conditioning of a pigment by applying shear to a crude pigment in the presence of a liquid conditioning agent selected from the group consisting of corn syrup, corn syrup solids and molasses and optionally in the presence of a viscosity modifying agent, in a medium which is essentially free from an added inorganic salt.
    Type: Grant
    Filed: May 23, 1983
    Date of Patent: January 15, 1985
    Assignee: Mobay Chemical Corporation
    Inventor: Thomas R. Flatt
  • Patent number: 4489110
    Abstract: Polyethylene terephthalate moulding compositions which contain delaminated kaolin may be processed into highly-reflecting objects.
    Type: Grant
    Filed: July 21, 1983
    Date of Patent: December 18, 1984
    Assignee: Bayer Aktiengesellschaft
    Inventor: Peter Bier
  • Patent number: 4487881
    Abstract: The present invention is directed to a thermoplastic molding composition comprising a blend of a thermoplastic aromatic polycarbonate resin, a graft elastomer, a polyanhydride and glass fibers, said composition is characterized by its improved impact performance.
    Type: Grant
    Filed: October 3, 1983
    Date of Patent: December 11, 1984
    Assignee: Mobay Chemical Corporation
    Inventors: Herbert L. Rawlings, Gerard E. Reinert
  • Patent number: 4478964
    Abstract: Polycarbonate compositions comprising an aromatic polycarbonate resin, wherein dispersed are silicate particulates, are particularly suitable for the preparation of films having a low coefficient of static friction, high light transmission and virtual freedom from haze.
    Type: Grant
    Filed: December 29, 1981
    Date of Patent: October 23, 1984
    Assignee: Mobay Chemical Corporation
    Inventor: Russell P. Carter, Jr.
  • Patent number: 4477637
    Abstract: A flame resistant polycarbonate blend comprising an alkylated aromatic polycarbonate and a sulfur-bearing compound characterized in exhibiting V-0 flame resistance classification, according to UL-94, is provided. Further provided is a process for the preparation of such blend.
    Type: Grant
    Filed: August 27, 1980
    Date of Patent: October 16, 1984
    Assignee: Mobay Chemical Corporation
    Inventor: Sivaram Krishnan
  • Patent number: 4474577
    Abstract: The present disclosure is concerned with new modifications of the dyestuff Color Index Acid Blue 324 which have significant advantages over the known form of this dyestuff. In particular, the preferred modification is much easier to isolate from an aqueous medium by filtration and the isolated product has a higher purity. The filtration proceeds much more rapidly and gives a filter residue of a much higher solids content. Furthermore, this new form of the dyestuff imparts a dramatically lower viscosity to aqueous dispersions or slurries prepared from it than are obtained using the old form of this dyestuff. These modifications are obtained by heating an aqueous dispersion or slurry of the known form of Color Index Acid Blue 324 to temperatures in excess of about 97.degree. C. and for the preferred form in the presence of a substance which reduces the surface tension between the dispersed organic dyestuff phase and the aqueous dispersing medium.
    Type: Grant
    Filed: October 26, 1983
    Date of Patent: October 2, 1984
    Assignee: Mobay Chemical Corporation
    Inventors: Charles W. Sandefur, Thomas J. Thomas
  • Patent number: 4472554
    Abstract: A thermoplastic molding composition is described comprising a blend of a polycarbonate, a certain graft polymer and polymeric acidifying agent which composition is characterized by its improved stability and impact strength.
    Type: Grant
    Filed: July 26, 1982
    Date of Patent: September 18, 1984
    Assignee: Mobay Chemical Corporation
    Inventors: Ulrich R. Grigo, Nelson R. Lazear, Mark W. Witman
  • Patent number: 4471104
    Abstract: The present invention relates to the preparation of aromatic polycarbonates by the known two-phase interface process, from diphenols characterized in that aromatic sulfonanilides are used as chain terminators in amounts of about 2 mol % to 20 mol %, preferably in amounts of about 2.5 mol % to 10 mol %, relative to mols of diphenols employed. In addition, the present invention relates to the aromatic polycarbonates obtainable by the process according to the invention. The products of this invention have been found to have better self extinguishing property compared to polycarbonates without sulfonamide end groups.
    Type: Grant
    Filed: November 4, 1982
    Date of Patent: September 11, 1984
    Assignee: Bayer Aktiengesellschaft
    Inventors: Sivaram Krishnan, Wolfgang Cohnen, Dieter Neuray
  • Patent number: 4468230
    Abstract: The present disclosure is concerned with aqueous dispersions of anionic acid dyes, especially the monosulphonated level dyeing acid dyes, which have low room temperature, low shear viscosities and good storage stability. This low viscosity enables them to be readily poured, pumped and otherwise handled. These dispersions comprise dyestuff solids with a controlled particle size distribution having a median value between about 1 and 10 microns; an anionic dispersant; and an electrolyte. In a preferred embodiment the pH is adjusted to give an optimum viscosity value. Another preferred feature is the adjustment of the rheology with a thickening agent such as xanthan gum. These dispersions find particular utility in the continuous dyeing of carpet, especially in Kuesters or foam dyeing equipment.
    Type: Grant
    Filed: March 25, 1983
    Date of Patent: August 28, 1984
    Assignee: Mobay Chemical Corporation
    Inventors: Thomas J. Thomas, Robert G. Hoguet, Charles W. Sandefur, Dietmar Kalz
  • Patent number: 4466912
    Abstract: Thermoplastic compositions comprising a polycarbonate resin, a graft copolymer and conductive particles are provided suitable for the preparation of molded articles characterized in that they provide an improved level of EMI shielding.
    Type: Grant
    Filed: September 30, 1982
    Date of Patent: August 21, 1984
    Assignee: Mobay Chemical Corporation
    Inventors: Walter J. Phillips, Herbert L. Rawlings
  • Patent number: 4463163
    Abstract: The present invention relates to the novel monomer 4,4'-bis(4-hydroxyphenyl thio)biphenyl, to a process for its production and to its use in the preparation of polycarbonates, polyurethanes, polyesters, polysulfones and polyethers which polymer resins are useful in the preparation of films, fibers and molded parts.
    Type: Grant
    Filed: June 1, 1982
    Date of Patent: July 31, 1984
    Assignee: Mobay Chemical Corporation
    Inventors: Sivaram Krishnan, John R. Sanderson
  • Patent number: 4463126
    Abstract: The present invention relates to a process for the preparation of coatings using a coating compound based on a system comprising (i) an isocyanate prepolymer based on isophorone diisocyanate and polyalkylene ether polyols having a hydroxyl functionality of 2 to 3 and (ii) at least one diprimary aromatic diamine having at least one alkyl substituent with 2 to 3 carbon atoms in an ortho-position to each amino group.
    Type: Grant
    Filed: January 27, 1983
    Date of Patent: July 31, 1984
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hermann Gruber, Wolfgang Wellner
  • Patent number: 4460752
    Abstract: A process for the preparation of polycarbonates from diphenols and/or chlorocarbonic acid esters thereof and phosgene by the two-phase boundary process wherein said polycarbonate is reacted with aryl chlorocarbonate is disclosed; the reaction products are noted for their improved ageing and hydrolysis characteristics which render them useful as thermoplastic molding compositions.
    Type: Grant
    Filed: October 25, 1982
    Date of Patent: July 17, 1984
    Assignee: Bayer Aktiengesellschaft
    Inventors: Dieter Neuray, Dieter Margotte, Erhard Tresper, Gunter Jacobs