Patents by Inventor Wilfried Zecher

Wilfried Zecher 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).

  • Production of polyamide imides
    Patent number: 5093457
    Abstract: The invention relates to a process for the production of polyamide imides from diimidodicarboxylic acids, trimellitic imidocarboxylic acids and diisocyanates and to their use as moldings, films and binders for paints.
    Type: Grant
    Filed: August 21, 1989
    Date of Patent: March 3, 1992
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wilfried Zecher, Rolf Dhein, Aziz El-Sayed, Wilfried Haese
  • Aliphatic-aromatic polyamide-imides
    Patent number: 5004795
    Abstract: The invention relates to aliphatic-aromatic polyamide-imides and their use for the production of shaped articles.
    Type: Grant
    Filed: August 21, 1989
    Date of Patent: April 2, 1991
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wilfried Zecher, Aziz El-Sayed, Wilfried Haese, Burkhard Kohler, Rolf-Volker Meyer
  • Process for improving the adhesive strength of electrolessly deposited metal layers on polyimide surfaces
    Patent number: 4910045
    Abstract: To improve the adhesive strength of electrolessly deposited metal deposits on surfaces of polyimide moulded bodies, the latter are treated with an activator formulation which, in addition to solvents, fillers and organometallic activators, preferably contains 5-25% of a polyimide as binder.
    Type: Grant
    Filed: December 2, 1988
    Date of Patent: March 20, 1990
    Assignee: Bayer Aktiengesellschaft
    Inventors: Henning Giesecke, Gerhard D. Wolf, Wilfried Zecher
  • Special polyimides as thermoplasts
    Patent number: 4908429
    Abstract: This invention relates to thermoplastic polyimides of 2,2-bis-phtalic acid anhydro-(4)-propane and 2,2-bis-(4-aminophenoxyphenyl-propane.
    Type: Grant
    Filed: May 5, 1988
    Date of Patent: March 13, 1990
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wilfried Zecher, Dieter Arlt, Aziz E. Sayed
  • Use of special polyimides as cast films and coatings
    Patent number: 4908430
    Abstract: This invention relates to the use of new special polyimides for the production of cast films and coatings.
    Type: Grant
    Filed: May 2, 1988
    Date of Patent: March 13, 1990
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wilfried Zecher, Dieter Arlt, Lutz Schrader, Werner Waldenrath
  • Polyamidimides having modified end groups
    Patent number: 4829140
    Abstract: Thermoplastic polyamidimides useful for high temperature coating and having exceptional tensile strength and dimensional stability to heat are produced by condensation of organic polyisocyanates, such as aliphatic, aliphatic-aromatic or aromatic diisocyanates, with cyclic polycarboxylic acid anhydrides and lactams or polyamides carried out at temperatures of from 0.degree. to 400.degree. C. and optionally in a solvent together with from 0.1 to 10 mol-%, preferably from 0.2 to 4 mol-%, of an imidocarboxylic acid corresponding to the following formula ##STR1## wherein R.sub.1 and R.sub.2 represent aliphatic, aliphatic-aromatic or aromatic groups and R.sub.1 carries at least one cyclic anhydride group or carboxyl group in addition to the cyclic imide group.
    Type: Grant
    Filed: August 19, 1985
    Date of Patent: May 9, 1989
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wilfried Zecher, Klaus Reinking
  • Aliphatic-aromatic polyamidimides containing polyamides
    Patent number: 4792590
    Abstract: This invention relates to the use of mixtures of aliphatic-aromatic polyamidimides and polyamides.
    Type: Grant
    Filed: July 2, 1987
    Date of Patent: December 20, 1988
    Assignee: Bayer Akteingesellschaft
    Inventors: Wilfried Zecher, Klaus Reinking
  • Process for the production of polyamide imides
    Patent number: 4640970
    Abstract: This invention relates to a process for the production of polyamide imides and the use thereof as plastics materials.
    Type: Grant
    Filed: August 21, 1985
    Date of Patent: February 3, 1987
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wilfried Zecher, Klaus Reinking, Frank Kleiner
  • Polyamide imides produced from either lactams or polyamides with isocyanates or anhydrides in which products are precipitated with a non-solvent
    Patent number: 4628079
    Abstract: This invention relates to the use of polyamide imides as thermoplasts.
    Type: Grant
    Filed: June 20, 1985
    Date of Patent: December 9, 1986
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wilfried Zecher, Rolf Dhein, Klaus Reinking
  • Process for the production of polyamideimides from polyisocyanates, polycarboxylic acid anhydrides and lactams or polyamides in which the reaction products are precipitated with a non-solvent
    Patent number: 4624981
    Abstract: This invention relates to a new process for the production of polyamide imides.
    Type: Grant
    Filed: June 20, 1985
    Date of Patent: November 25, 1986
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wilfried Zecher, Rolf Dhein, Klaus Reinking
  • Process for the preparation of aliphatic-aromatic poly-amide-imides in the absence of phenols
    Patent number: 4600729
    Abstract: The invention relates to a process for the preparation of aliphatic-aromatic polyamide-imides in the absence of phenols.
    Type: Grant
    Filed: February 19, 1985
    Date of Patent: July 15, 1986
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wilfried Zecher, Klaus Reinking
  • Polyamideimides prepared by reacting either lactams or polyamides with polyisocyanates and anhydrides using a lactam as an additive
    Patent number: 4548970
    Abstract: This invention relates to new polyamide imides and to the use thereof as thermoplasts.
    Type: Grant
    Filed: August 27, 1984
    Date of Patent: October 22, 1985
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wilfried Zecher, Rolf Dhein, Klaus Reinking
  • Polyamideimides produced from either lactams or polyamides with isocyanates and anhydrides as thermoplasts
    Patent number: 4549006
    Abstract: This invention relates to the use of polyamide imides as thermoplasts.
    Type: Grant
    Filed: August 27, 1984
    Date of Patent: October 22, 1985
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wilfried Zecher, Rolf Dhein, Klaus Reinking
  • Polyamidoimides prepared from trimelitic acid anhydride, isocyanates and either lactams or polyamides using a mixture of diisocyanatodiphenylmethane and tolylene diisocyanates
    Patent number: 4546162
    Abstract: This invention relates to certain new aliphatic-aromatic polyamidoimides suitable for use as non-clouding electroinsulating lacquers and duroplasts.
    Type: Grant
    Filed: August 27, 1984
    Date of Patent: October 8, 1985
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wilfried Zecher, Willi Dunwald, Rudolf Merten, Klaus Reinking
  • Process for the production of polyamide imides by using a phenol in the workup of the material
    Patent number: 4546138
    Abstract: This invention relates to a new process for the production of polyamide imides.
    Type: Grant
    Filed: August 27, 1984
    Date of Patent: October 8, 1985
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wilfried Zecher, Rolf Dhein, Klaus Reinking
  • Process for preparation of hydantoin esters through a masked polyisocyanate-carbodiimide route
    Patent number: 4517353
    Abstract: This invention relates to a process for the preparation of compounds containing at least one hydantoin ring in the molecule from carbodiimides having acylurea end groups and .alpha.,.beta.-unsaturated carboxylic acid derivatives and to their further reaction with carboxylic acids containing at least one other reactive group.
    Type: Grant
    Filed: December 6, 1983
    Date of Patent: May 14, 1985
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wilfried Zecher, Rudolf Merten, Willi Dunwald
  • Process for the preparation of fumaric acid monoesters
    Patent number: 4515974
    Abstract: Fumaric acid monoesters can be prepared by introducing a hydroxyl compound at a rate corresponding to the progress of the reaction into a solution or a melt of maleic anhydride, which may optionally be substituted, if appropriate in the presence of a cis-trans catalyst. New fumaric acid monoesters can be formed by the process.
    Type: Grant
    Filed: June 25, 1982
    Date of Patent: May 7, 1985
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wilfried Zecher, Rudolf Merten
  • Process for the production of polyamide imides
    Patent number: 4472567
    Abstract: The condensation of organic polyisocyanates, lactams, and cyclic polycarboxylic acid anhydrides in the presence of mono- or disubstituted imidazole catalyst results in a polyamide imide having an increased softening temperature.
    Type: Grant
    Filed: August 22, 1983
    Date of Patent: September 18, 1984
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wilfried Zecher, Rudolf Merten, Willi Dunwald
  • Process for the production of imidazolidine triones
    Patent number: 4384122
    Abstract: A process for the production of imidazolidine triones by reacting optionally masked iso(thio)cyanates with oxalic acid mono esters.
    Type: Grant
    Filed: June 29, 1981
    Date of Patent: May 17, 1983
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wilfried Zecher, Rudolf Merten
  • Process for the preparation of polymers containing hydantoin groups
    Patent number: 4298515
    Abstract: A process for the production of modified polyhydantions by reacting polyglycine acid derivatives with optionally masked polyisocyanates with the addition of cyclic anhydride compounds containing at least one further functional group capable of condensation in lactones as solvents.
    Type: Grant
    Filed: December 6, 1979
    Date of Patent: November 3, 1981
    Assignee: Bayer Aktiengesellschaft
    Inventors: Jurgen Lewalter, Ludwig Rottmaier, Rudolf Merten, Wilfried Zecher, Willi Dunwald, Bernhard Schulte