Patents by Inventor Erhard Tresper

Erhard Tresper 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).

  • Process for the preparation of polyarylene sulphides
    Patent number: 5306805
    Abstract: This invention relates to a simplified process for the preparation of polyarylene sulphides with improved product quality from alkali metal sulphides and dihalogenated aromatic compounds, in which the alkali metal sulphides are prepared and reacted in situ.
    Type: Grant
    Filed: February 10, 1992
    Date of Patent: April 26, 1994
    Assignee: Bayer AG
    Inventors: Wolfgang Arlt, Wolfgang Alewelt, Karl-Heinrich Meyer, Manfred Schmidt, Erhard Tresper, Wolfgang Eisermann
  • Process for the purification of polyarylene sulphides
    Patent number: 5247063
    Abstract: This invention relates to a process for the purification of optionally branched polyarylene sulphides (PPS). Polyarylene sulphides which have been purified according to the invention are distinguished by the reduced amount of ash-forming impurities contained in them.
    Type: Grant
    Filed: June 12, 1992
    Date of Patent: September 21, 1993
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Alewelt, Franz Alfes, Wolfgang Eisermann, Erhard Tresper
  • Polyphenylene sulphide moulding compounds with improved electrical properties
    Patent number: 5234984
    Abstract: This invention relates to crystalline, thermoplastic moulding compounds of polyphenylene sulphide (PPS) and aliphatically saturated carboxylic acid esters. The moulding compounds have increased tracking resistance.
    Type: Grant
    Filed: July 23, 1990
    Date of Patent: August 10, 1993
    Assignee: Bayer Aktiengesellschaft
    Inventors: Karl-Heinz Kohler, Wolfgang Wehnert, Klaus Kraft, Erhard Tresper
  • Coatings based on polyarylene sulfides
    Patent number: 5120606
    Abstract: The invention relates to coatings based on linear, high molecular weight polyarylene sulfides, preferably PPS, by extrusion coating of, for example, elongate stock in the form of, for example, wires, strands, optical fibers, etc.
    Type: Grant
    Filed: March 6, 1989
    Date of Patent: June 9, 1992
    Assignee: Bayer Aktiengesellschaft
    Inventors: Gerwolf Quaas, Erhard Tresper, Klaus Kraft, Klaus Reinking
  • Two-component injection molding with polyarylene sulfides
    Patent number: 5114791
    Abstract: The invention relates to two-component injection-molded articles in which polyarylene sulfides (PAS), preferably polyphenylene sulfide (PPS), are present as at least one component and to a process for their production.
    Type: Grant
    Filed: February 2, 1989
    Date of Patent: May 19, 1992
    Assignee: Bayer Aktiengesellschaft
    Inventors: Kurt-Rainer Stahlke, Klaus Reinking, Erhard Tresper, Klaus Kraft, Axel Kaminski
  • Copoly arylene/alkylene sulfide
    Patent number: 5066775
    Abstract: The invention relates to new sulphur-containing copolymers, a process for their preparation from a sulphur source and a mixture of dihalogenoaromatics and dihalogenoaliphatics and their use for the production of shaped articles.
    Type: Grant
    Filed: February 5, 1990
    Date of Patent: November 19, 1991
    Assignee: Bayer Aktiengesellschaft
    Inventors: Ernst-Ulrich Dorf, Klaus Reinking, Wolfgang Jakob, Erhard Tresper, Wolfgang Russeler
  • Filled thermoplasts with low shrinkage anisotropy
    Patent number: 5066704
    Abstract: A composition useful in producing molded articles, fibers and sheet products is a mixture of from 20 to 80% by weight of polyarylene sulphides, from 10 to 60% by weight of glass fibers and from 60 to 10% by weight of mica.
    Type: Grant
    Filed: May 21, 1990
    Date of Patent: November 19, 1991
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Wehnert, Klaus Reinking, Peter Bier, Klaus Kraft, Erhard Tresper
  • Process for the production of high molecular weight, optionally branched polyarylene sulfides having reduced content of extractable oligomers
    Patent number: 5055551
    Abstract: This invention relates to a process for the production of high molecular weight, optionally branched polyarylene sulfides having a reduced content of extractable oligomeric constituents. They are prepared by reaction of alkali sulfides and/or alkali hydrogen sulfides with aromatic dihalogen compounds in a polar organic solvent.
    Type: Grant
    Filed: November 13, 1989
    Date of Patent: October 8, 1991
    Assignee: Bayer Aktiengesellschaft
    Inventors: Manfred Schmidt, Wolfgang Arlt, Erhard Tresper, Wolfgang Russeler
  • Rapid-crystallizing polyphenylene sulphide compositions
    Patent number: 5045585
    Abstract: The invention relates to highly crystalline, rapid-crystallizing, thermoplastic compositions of polyphenylene sulphides and carboxylic acid esters or carbonic acid esters.
    Type: Grant
    Filed: May 4, 1990
    Date of Patent: September 3, 1991
    Assignee: Bayer Aktiengesellschaft
    Inventors: Peter Bier, Klaus Reinking, Ludwig Bottenbruch, Erhard Tresper
  • Process for the production of high molecular weight, optionally branched polyarylene sulfides
    Patent number: 5037952
    Abstract: The invention relates to a process for the production of high molecular weight, optionally branched polyarylene sulfides having a low content of organically bound halogen. They are prepared by reaction of alkali sulfides and/or alkali hydrogen sulfides with aromatic dihalogen compounds in a polar organic solvent.
    Type: Grant
    Filed: November 13, 1989
    Date of Patent: August 6, 1991
    Assignee: Bayer Aktiengesellschaft
    Inventors: Manfred Schmidt, Erhard Tresper, Wolfgang Alewelt, Ernst-Ulrich Dorf, Wolfgang Russeler
  • Process for the production of aromatic polyether ketones
    Patent number: 4999414
    Abstract: The invention relates to a process for the production of crystalline, aromatic polyether ketones in lactams as solvent. The polymers produced have a high molecular weight, high thermal stability, high resistance to the effect of chemicals and good mechanical properties.
    Type: Grant
    Filed: July 17, 1989
    Date of Patent: March 12, 1991
    Assignee: Bayer Aktiengesellschaft
    Inventors: Joachim Genz, Erhard Tresper, Karsten-Josef Idel, Ludwig Bottenbruch, Volker Eckhardt
  • Elastomer-modified carbon-containing polyarylene sulfide blends
    Patent number: 4985175
    Abstract: The invention relates to conductive blends of polyarylene sulfides (PAS), preferably polyphenylene sulfide (PPS), with graft polymers, conductive carbon black and graphite.
    Type: Grant
    Filed: August 14, 1989
    Date of Patent: January 15, 1991
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans-Jurgen Dziurla, Klaus Reinking, Wolfgang Wehnert, Erhard Tresper
  • Rapid-crystallizing polyphenylene sulphide compositions
    Patent number: 4942194
    Abstract: The invention relates to highly crystalline, rapid-crystallizing, thermoplastic compositions of polyphenylene sulphides and carboxylic acid esters.
    Type: Grant
    Filed: February 26, 1987
    Date of Patent: July 17, 1990
    Assignee: Bayer Aktiengesellschaft
    Inventors: Peter Bier, Klaus Reinking, Ludwig Bottenbruch, Erhard Tresper
  • Isolation of purified solid polyarylene sulfide directly from polymerization solution
    Patent number: 4920201
    Abstract: This invention relates to a process for the preparation of crystalline polyarylenesulphides. Polyarylenesulphides with a high degree of purity, low electrolyte content and low non-uniformity are obtained. The polyarylenesulphides obtained have improved mechanical and electrical properties.
    Type: Grant
    Filed: August 18, 1988
    Date of Patent: April 24, 1990
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Jakob, Erhard Tresper, Wolfgang Alewelt
  • Process for isolating polyarylene sulphides
    Patent number: 4895930
    Abstract: The invention relates to a process for purifying and isolating polyarylene sulphides. In this process polyarylene sulphides are obtained with a particularly low electrolyte content.
    Type: Grant
    Filed: June 30, 1988
    Date of Patent: January 23, 1990
    Assignee: Bayer Aktiengesellschaft
    Inventors: Franz Alfes, Wolfgang Alewelt, Wolfgang Eisermann, Erhard Tresper
  • Process for the preparation of N-alkylated caprolactams
    Patent number: 4873326
    Abstract: This invention relates to a process for the preparation of N-alkylated caprolactams by the cyclization of N-alkylated caproic acids.
    Type: Grant
    Filed: August 11, 1988
    Date of Patent: October 10, 1989
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Jakob, Wolfgang Alewelt, Erhard Tresper
  • Process for holding and foaming thermoplastic polyphenylene sulphide articles and the resultant products
    Patent number: 4804689
    Abstract: The present invention relates to a process for molding a foamed article comprising mixing a polyphenylene sulfide resin with about 0.1 to 10% of an oligomeric sulfone carbonate as a foaming agent and with 0.1 to 2% of a basic catalyst at a temperature of about 150.degree. to 180.degree. C. and then heating the resulting mixture at a temperature of 280.degree.-350.degree. C. to affect a reaction mixture and introducing the reaction mixture into a suitable mold for producing a foamed article.
    Type: Grant
    Filed: June 29, 1987
    Date of Patent: February 14, 1989
    Assignee: Bayer Aktiengesellschaft
    Inventors: Paul J. Mayska, Erhard Tresper
  • Process for the preparation of polyether-sulphones
    Patent number: 4775738
    Abstract: The present invention relates to the preparation of polyether-sulphones from polycarbonates.
    Type: Grant
    Filed: August 27, 1986
    Date of Patent: October 4, 1988
    Assignee: Bayer Aktiengesellschaft
    Inventors: Paul J. Mayska, Erhard Tresper
  • Polyarylene sulphide capped with monophenol compound
    Patent number: 4771120
    Abstract: The invention relates to polyarylene sulphides with melt viscosities settable to defined values. The products are distinguished by high stability of the melt. They are obtained by adding, in the preparation of these polyarylene sulphides, certain phenols as chain terminators to the reaction mixture.
    Type: Grant
    Filed: January 7, 1987
    Date of Patent: September 13, 1988
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Alewelt, Franz Alfes, Wolfgang Eisermann, Wolfgang Jakob, Erhard Tresper
  • Rapid crystallizing polyphenylene sulphide compositions
    Patent number: 4743638
    Abstract: The invention relates to highly crystalline, rapid-crystallizing, thermoplastic compositions of polyphenylene sulphides and aromatic phosphoric acid esters.
    Type: Grant
    Filed: February 26, 1987
    Date of Patent: May 10, 1988
    Assignee: Bayer Aktiengesellschaft
    Inventors: Peter Bier, Klaus Reinking, Ludwig Bottenbruch, Erhard Tresper