Patents by Inventor Dieter Freitag

Dieter Freitag 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).

  • Thermoplastic moulding compositions based on polyphenylene oxide/polycarbonate block condensates
    Patent number: 4740554
    Abstract: The present invention provides moulding compositions consisting of polyphenylene oxide/polycarbonate block condensates, graft polymers and, where appropriate, co-polymers. These moulding compositions can contain further suitable additives. The present invention also provides a process for preparing the moulding compositions according to the invention.
    Type: Grant
    Filed: November 10, 1986
    Date of Patent: April 26, 1988
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans-Jurgen Kress, Peter Tacke, Dieter Freitag, Karl-Heinz Ott
  • Tetra-(hydroxyaryl)-bis-quinoxalines and preparation thereof
    Patent number: 4739058
    Abstract: The present invention relates to bis-quinoxalines of the formula I ##STR1## their preparation, their use as branching agents for the preparation of branched, thermoplastic polycarbonates and the branched thermoplastic polycarbonates.
    Type: Grant
    Filed: June 19, 1986
    Date of Patent: April 19, 1988
    Assignee: Bayer Aktiengesellschaft
    Inventors: Volker Eckhardt, Hans-Rudolf Dicke, Dieter Freitag
  • Polyarylene sulphide having high melt viscosity
    Patent number: 4732967
    Abstract: This invention relates to optionally branched polyarylene sulphides and a process for the production thereof in a polar solvent, from 0.2 to 100 mole %, based on the aromatic dihalogen compounds, of an amino acid being added to the reaction mixture.
    Type: Grant
    Filed: September 9, 1986
    Date of Patent: March 22, 1988
    Assignee: Bayer Aktiengesellschaft
    Inventors: Karsten Idel, Edgar Ostlinning, Dieter Freitag, Wolfgang Alewelt
  • Process for the preparation of copolyphosphonates having high toughness
    Patent number: 4719279
    Abstract: Polyester-phosphonates, polycarbonatophosphonates and polyester-carbonatophosphonates having improved impact strength and notched impact strength as compared with melt-condensation products can be prepared in such a way that, in the first stage, oligophosphonates with hydroxyl end groups are prepared by melt-transesterification and melt-condensation and these are subjected in a second stage to a phase boundary process.
    Type: Grant
    Filed: May 30, 1986
    Date of Patent: January 12, 1988
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hermann Kauth, Klaus Reinking, Dieter Freitag
  • Process for the preparation of aromatic polyester-carbonates having improved notched impact strength, and polyester-carbonates prepared thereby and their use for the production of mouldings, films and coatings
    Patent number: 4714746
    Abstract: Aromatic polyester-carbonates having greatly differing contents of ester groups possess an improved notched impact strength.
    Type: Grant
    Filed: October 14, 1986
    Date of Patent: December 22, 1987
    Assignee: Bayer Aktiengesellschaft
    Inventors: Volker Serini, Dieter Freitag, Dietrich Rathmann
  • Thermoplastic moulding materials
    Patent number: 4704430
    Abstract: The present invention relates to thermoplastic moulding materials of (A) thermoplastic polycarbonates mixed with (B) thermoplastic polyalkylene terephthalates and, if appropriate, with (C) elastomeric polymers, which are characterized in that they contain (D) a polycarbonate-polyphenylene oxide block co-condensate.
    Type: Grant
    Filed: July 17, 1986
    Date of Patent: November 3, 1987
    Assignee: Bayer Aktiengesellschaft
    Inventors: Dieter Freitag, Werner Nouvertne, Peter Tacke, Klaus G. Wilms
  • Process for the preparation of polyphosphonic acid amides
    Patent number: 4701554
    Abstract: The invention relates to a process for the preparation of polyphosphonic acid amides by condensation of 0.5-2 moles of a phosphonic acid diaryl ester and 1 mole of an aliphatic, aromatic, araliphatic or heterocyclic primary or secondary diamine in the melt at 50.degree.-350.degree. C., if appropriate in the presence of a catalyst which accelerates the condensation and under an inert gas atmosphere, the corresponding phenol being split off.
    Type: Grant
    Filed: December 10, 1985
    Date of Patent: October 20, 1987
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hermann Kauth, Manfred Schmidt, Dieter Freitag, Udo Rudolph, Frank Kleiner
  • Special epoxy resins
    Patent number: 4690998
    Abstract: The invention relates to epxoy resins obtained by reaction of epichlorohydrin with selected mixtures of phenols for the production of thermosetting and cold-hardening moldings, coating compositions and adhesive compositions.
    Type: Grant
    Filed: February 14, 1986
    Date of Patent: September 1, 1987
    Assignee: Bayer Aktiengesellschaft
    Inventors: Bernd Wahle, Dieter Freitag, Walter Uerdingen, Heinrich Heine, Manfred Blazejak
  • Thermoplastic polysiloxane-polyester (carbonate) block copolymers, their preparation and use
    Patent number: 4681922
    Abstract: Siloxane/polyester (carbonate) block copolymers comprising wholly aromatic polyester or polyestercarbonate units and from 0.5 to 7.5% by weight of polysiloxane blocks, exhibit an improved melt flowability without impairment of the heat stability.
    Type: Grant
    Filed: November 29, 1984
    Date of Patent: July 21, 1987
    Assignee: Bayer Aktiengesellschaft
    Inventors: Manfred Schmidt, Winfried Paul, Dieter Freitag, Dietrich Rathmann
  • Flame resistant moulding compounds based on styrene polymers
    Patent number: 4668720
    Abstract: This invention relates to flame resistant moulding compounds produced from mixtures of styrene polymers halogenated organic compounds, special polyphosphonic acid amides and optionally conventional additives.
    Type: Grant
    Filed: August 6, 1985
    Date of Patent: May 26, 1987
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hermann Kauth, Hubert Bosshammer, Manfred Schmidt, Dieter Freitag
  • Preparation of polyarylene sulphide in presence of amino carboxylic acid
    Patent number: 4661584
    Abstract: This invention relates to optionally branched polyarylene sulphides and a process for the production thereof in a polar solvent, from 0.2 to 100 mole %, based on the aromatic dihalogen compounds, of an amino acid being added to the reaction mixture.
    Type: Grant
    Filed: December 30, 1985
    Date of Patent: April 28, 1987
    Assignee: Bayer Aktiengesellschaft
    Inventors: Karsten Idel, Edgar Ostlinning, Dieter Freitag, Wolfgang Alewelt
  • High molecular weight polyesters, preparation and use thereof
    Patent number: 4654411
    Abstract: Polyesters having at least 90%, by weight, of recurrent structural units corresponding to the following formula: ##STR1## and characterised by a relative viscosity.eta..sub.rel of from 1.6 to 4.5 (determined at 25.degree. C. in CH.sub.2 Cl.sub.2, c=5 g/l) are suitable for the production of films having highly advantageous performance characteristics, in particular high heat resistance.
    Type: Grant
    Filed: September 3, 1985
    Date of Patent: March 31, 1987
    Assignee: Bayer Aktiengesellschaft
    Inventors: Volker Serini, Bernhard Schulte, Werner Waldenrath, Dieter Freitag, Uwe Hucks, Joachim Wank, Hans-Leo Weber
  • Use of certain polyphenylene oxides for the production of aromatic block polyether-poly(ester) carbonates by the interfacial process
    Patent number: 4645806
    Abstract: This invention relates to the use of polyphenylene oxides corresponding to the following general formula: ##STR1## for the production of aromatic block polyether-poly(ester) carbonates by the interfacial process and also to the block polyether-poly(ester) carbonates obtainable by the process.
    Type: Grant
    Filed: December 9, 1985
    Date of Patent: February 24, 1987
    Assignee: Bayer Aktiengesellschaft
    Inventors: Dieter Freitag, Ludwig Bottenbruch, Klaus G. Wilms, Peter Tacke
  • Process for the production of high molecular weight, optionally branched polyarylene sulphide with an ester or anhydride of a carboxylic acid
    Patent number: 4631336
    Abstract: This invention relates to a process for the production of high molecular weight, optionally branched polyarylene sulphides from alkali metal sulphides and halogenated aromatic compounds in the presence of from 0.5 to 100 mol %, based on the molar quantity of aromatic dihalogen compounds, of an ester or anhydride of a carboxylic acid.
    Type: Grant
    Filed: August 1, 1985
    Date of Patent: December 23, 1986
    Assignee: Bayer Aktiengesellschaft
    Inventors: Karsten Idel, Edgar Ostlinning, Dieter Freitag
  • Process for the production of colorless aromatic polyester and polyester carbonates
    Patent number: 4617368
    Abstract: The invention relates to a process for the production of colorless, heat-stable and hydrolysis-stable aromatic polyesters and polyester carbonates by conventional interfacial polycondensation of aromatic dicarboxylic acid dichlorides and diphenolates in which dicarboxylic acid dichlorides are used which have been obtained by chlorination from the dimethyl esters of the corresponding acids, and tertiary cycloaliphatic amines are used as catalysts.
    Type: Grant
    Filed: December 10, 1984
    Date of Patent: October 14, 1986
    Assignee: Bayer Aktiengesellschaft
    Inventors: Dieter Freitag, Ludwig Bottenbruch, Uwe Hucks
  • Thermotropic aromatic polyesters having high rigidity and toughness, process for the production thereof and the use thereof for the production of moulded articles, filaments, fibres and films
    Patent number: 4603190
    Abstract: Thermotropic wholly aromatic polyesters containing condensed residues of p-hydroxybenzoic acid, isophthalic and optionally terephthalic acid, hydroquinone and 3.4'- and/or 4.4'-dihydroxy diphenyl, -diphenyl ether and/or -diphenyl sulphide, have excellent mechanical properties and are nevertheless not difficult to process.
    Type: Grant
    Filed: July 3, 1984
    Date of Patent: July 29, 1986
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans-Rudolf Dicke, Manfred Schmidt, Dieter Freitag, Aziz El-Sayed
  • Thermotropic aromatic polyesters with good rigidity and toughness, process for the production thereof and the use thereof for the production of mouldings, filaments fibres and films
    Patent number: 4600764
    Abstract: Thermotropic fully-aromatic polyesters which contain radicals of 3,4'- and/or 4,4'-dihydroxybenzophenone in addition to radicals of p-hydroxybenzoic acid, iso- and optionally terephthalic acid, hydroquinone and/or 4,4'-dihydroxydiphenyl, have good rigidity and toughness and yet are easily processible.
    Type: Grant
    Filed: April 15, 1985
    Date of Patent: July 15, 1986
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans-Rudolf Dicke, Ludwig Bottenbruch, Dieter Freitag, Aziz E. Sayed
  • Two stage process for the production of aromatic polyester-carbonate
    Patent number: 4600753
    Abstract: The invention relates to a process for the preparation of aromatic polyester-carbonates wherein, in a first stage, aromatic oligo-esters or oligo-ester-carbonates having hydroxyl end groups are prepared from diaryl esters of aromatic dicarboxylic acids (or their starting materials) and diphenols and, optionally, a diaryl carbonate, by trans-esterification in the melt, and in a second stage these oligo-esters or oligo-ester-carbonates are condensed with phosgene by the phase boundary process to give the polyester-carbonate.
    Type: Grant
    Filed: December 10, 1984
    Date of Patent: July 15, 1986
    Assignee: Bayer Aktiengesellschaft
    Inventors: Dieter Freitag, Claus H. Wulff, Gerhard Henes, Ludwig Bottenbruch, Peter Tacke
  • Process for the production of high molecular weight, optionally branched polyarylene sulphides
    Patent number: 4598144
    Abstract: The present invention relates to a process for the production of high molecular weight, optionally branched polyarylene sulphides. These can be produced in a polar organic solvent in the absence of water in a reaction vessel cascade comprising from two to six reaction vessels.
    Type: Grant
    Filed: March 11, 1985
    Date of Patent: July 1, 1986
    Assignee: Bayer Aktiengesellschaft
    Inventors: Edgar Ostlinning, Karsten Idel, Wolfgang M. Eisermann, Dieter Freitag
  • Thermotropic aromatic polyesters having a high tenacity and an improved melt viscosity, and mouldings, filaments, fibres and films thereof
    Patent number: 4564669
    Abstract: Thermotropic fully aromatic polyesters which contain radicals of p-hydroxybenzoic acid, iso- and/or terephthalic acid and 2,7-dihydroxynaphthalene condensed therein, having outstanding mechanical properties and accordingly are very easy to process.
    Type: Grant
    Filed: July 3, 1984
    Date of Patent: January 14, 1986
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans-Rudolf Dicke, Manfred Schmidt, Aziz El-Sayed, Ulrich Biskup, Ludwig Bottenbruch, Dieter Freitag