Patents by Inventor Willi Dunwald

Willi Dunwald 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).

  • Patent number: 5126479
    Abstract: The present invention relates to a process for the production of organic compounds containing (i) carbodiimide and/or uretone imine groups and (ii) blocked isocyanate groups, wherein about 10 to 90% of the isocyanate groups of an organic polyisocyanate are blocked by reaction with a monofunctional blocking agent for isocyanate groups, and subsequently about 65 to 100% of the free isocyanate groups still remaining are converted into carbodiimide groups with elimination of the carbodiimide. The present invention also relates to the organic compounds obtainable by this process and to their use for the production of plastics by reaction with compounds containing isocyanate-reactive groups by the isocyanate polyaddition process.
    Type: Grant
    Filed: May 15, 1989
    Date of Patent: June 30, 1992
    Assignee: Bayer Aktiengesellschaft
    Inventors: Willi Dunwald, Reinhard Halpaap, Josef Pedain
  • Patent number: 5126422
    Abstract: The present invention relates to coating compositions which are suitable for the production of heat resistant films and coatings and containa) 100 parts by weight of organic compounds having (i) carbodiimide and/or uretoneimine groups and (ii) blocked isocyanate groups,b) 2 to 100 parts by weight of intramolecular carboxylic acid anhydrides which have a molecular weight of 98 to 500 and may contain free carboxyl groups andc) 2 to 100 parts by weight of polyhydric alcohols which have a molecular weight of 62 to 400 and a hydroxyl functionality of 2 to 4.The present invention also relates to heat-resistant substrates, in particular for wires, coated with these coating compositions.
    Type: Grant
    Filed: June 7, 1991
    Date of Patent: June 30, 1992
    Assignee: Bayer Aktiengesellschaft
    Inventors: Reinhard Halpaap, Willi Dunwald, Holger Casselmann, Hans Schlegel
  • Patent number: 5061515
    Abstract: The present invention is directed to lacquer binders containing polyvinyl acetal which are suitable for the formation of films and coatings and contain mixtures ofa) polyvinyl acetals andb) organic compounds containing (i) carbodiimide and/or uretone imine groups and (ii) blocked isocyanate groups,the mixtures containing from 1 to 300 parts by weight of component b) per 100 parts by weight of component a).The invention is also directed to a process for the formation of coatings on heat resistant substrates by coating these substrates with a coating composition containing binder, inert solvent and optionally the conventional auxiliary agents and additives used in lacquer technology, followed by curing of the coating at temperatures above about 80.degree. C., characterized in that the coating compositions used contain binders of the type mentioned above. Finally, the present invention is directed to these coated heat resistant substrates.
    Type: Grant
    Filed: April 5, 1990
    Date of Patent: October 29, 1991
    Assignee: Bayer Aktiengesellschaft
    Inventors: Willi Dunwald, Hans Schlegel
  • Patent number: 4954577
    Abstract: Lacquer binders suitable for the production of highly heat-resistant films and coatings consisting of a mixture of(a) polyamide-imides based on trimellitic anhydride, lactams and diisocyanates,(b) organic compounds carrying (i) carbodiimide and/or uretone imine groups and (ii) blocked isocyanate groups and optionally,(c) auxiliaries and additives.The use of these binders in coating compositions for heat-resistant substrates and a process for the production of wire enamels using said coating compositions.
    Type: Grant
    Filed: April 18, 1988
    Date of Patent: September 4, 1990
    Assignee: Bayer Aktiengesellschaft
    Inventors: Willi Dunwald, Hans Schlegel, Reinhard Halpaap, Josef Pedain
  • Patent number: 4853261
    Abstract: The invention relates to a process for the production of coatings based on polymers having a hydantoin structure by reacting blocked polyisocyanate carrying carbodiimide and/or uretone imine groups with .alpha.,.beta.-unsaturated diicarboxylic acids or derivatives thereof at 50.degree. to 700.degree. C. said reaction being carried out on the substrate to be coated.
    Type: Grant
    Filed: April 13, 1988
    Date of Patent: August 1, 1989
    Assignee: Bayer Aktiengesellschaft
    Inventors: Willi Dunwald, Hans Schlegel, Reinhard Halpaap, Josef Pedain
  • Patent number: 4565843
    Abstract: This invention relates to new wire lacquers based on hydantoin group-containing polymers.
    Type: Grant
    Filed: December 18, 1984
    Date of Patent: January 21, 1986
    Assignee: Bayer Aktiengesellschaft
    Inventor: Willi Dunwald
  • 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
  • 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
  • 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
  • Patent number: 4465840
    Abstract: This invention relates to a process for the production of compounds containing at least one (thio)-hydantoin ring in the molecule by reacting a carbodiimide with hydroxy- or mercapto-succinic acid diesters corresponding to the following general formula: ##STR1## wherein R.sup.4 and X are as defined in the description.
    Type: Grant
    Filed: November 1, 1982
    Date of Patent: August 14, 1984
    Assignee: Bayer Aktiengesellschaft
    Inventors: Bernhard Schulte, Wolfgang Jakob, Willi Dunwald, Karl-Heinrich Meyer
  • Patent number: 4465839
    Abstract: The invention relates to a process for the production of compounds containing at least one hydantoin ring by reacting a carbodiimide with derivatives of succinic acid anhydride corresponding to the following general formula: ##STR1## wherein R.sup.4 represents a halogen atom, an alkyl-carboxy or aryl-carboxy group; or with maleic acid anhydride in the presence of aromatic OH-functional compounds at temperatures of from about 20.degree. to about 250.degree. C., optionally in a solvent and optionally in the presence of a catalyst, and also to the use of the polyhydantoins obtained, where they have high molecular weights, as high temperature-resistant coating compositions, films, powders, adhesives, lacquers or mouldings.
    Type: Grant
    Filed: November 1, 1982
    Date of Patent: August 14, 1984
    Assignee: Bayer Aktiengesellschaft
    Inventors: Bernhard Schulte, Wolfgang Jakob, Willi Dunwald, Karl-Heinrich Meyer
  • Patent number: 4448942
    Abstract: The invention relates to a new process for the production of compounds containing at least one hydantoin ring by reacting a carbodiimide with a derivative of an .alpha.,.beta.-unsaturated carboxylic acid corresponding to the following general formula: ##STR1## wherein R.sup.3, R.sup.4 and R.sup.5 are as defined in the description.
    Type: Grant
    Filed: November 1, 1982
    Date of Patent: May 15, 1984
    Assignee: Bayer Aktiengesellschaft
    Inventors: Bernhard Schulte, Wolfgang Jakob, Willi Dunwald, Karl-Heinrichrich Meyer
  • Patent number: 4444845
    Abstract: This invention relates to a new process for the production of coatings by coating heat-resistant substrates with a coating compound in which the binder is a two-component system containing polyisocyanates having at least partially blocked isocyanate groups and compounds containing isocyanate reactive groups and optionally further auxiliary agents and additives, the two-component system being one in which from about 0.1 to 60 equivalent % of the component containing isocyanate reactive groups consists of N,N',N"-tris-(2-hydroxyethyl)-isocyanurate, and to the coated substrate produced therefrom.
    Type: Grant
    Filed: August 13, 1982
    Date of Patent: April 24, 1984
    Assignee: Bayer Aktiengesellschaft
    Inventor: Willi Dunwald
  • 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
  • Patent number: 4293669
    Abstract: Heat resistant polymers connected by ester and/or urethane groups and optionally amide- and/or imide groups and/or hydantoin and/or isocyanurate rings are obtained by crosslinking the polymers with trishydroxy alkyl triazolidine -3,5-diones.
    Type: Grant
    Filed: March 3, 1980
    Date of Patent: October 6, 1981
    Assignee: Bayer Aktiengesellschaft
    Inventors: Ludwig Rottmaier, Rudolf Merten, Jurgen Lewalter, Wilfried Zecher, Willi Dunwald
  • Patent number: 4289868
    Abstract: Poly(thio)hydantoins are prepared by reacting an iso(thio)cyanate having at least two iso(thio)cyanate moieties with a compound of the formula ##STR1## wherein R.sup.1 and R.sup.2 are the same or different and each represents hydrogen, halogen, a C.sub.1 -C.sub.20 aliphatic group, a C.sub.7 -C.sub.20 aliphatic-aromatic group, a C.sub.6 -C.sub.20 aromatic group or a heterocyclic group having from 4 to 16 ring members and at least one N, O or S atom;A represents CN, COR, substituted or unsubstituted C.sub.1 -C.sub.20 aliphatic group, C.sub.7 -C.sub.20 aliphatic-aromatic group, C.sub.6 -C.sub.20 aromatic group or a heterocyclic group having from 4 to 16 ring members and at least one N, O or S atom wherein the substituents are NO.sub.2, COOR.sub.4, CN, CO or OH; R and R.sup.4 are selected from the definition of R.sup.1 and R.sup.2 with the exclusion of halogen;M represents OH or ##STR2## and R.sup.6 represents hydrogen, unsubstituted or substituted C.sub.2 -C.sub.20 aliphatic, C.sub.5 -C.sub.12 cycloaliphatic, C.
    Type: Grant
    Filed: December 6, 1979
    Date of Patent: September 15, 1981
    Assignee: Bayer Aktiengesellschaft
    Inventors: Jurgen Lewalter, Rudolf Merten, Wilfried Zecher, Willi Dunwald
  • Patent number: 4281095
    Abstract: In non-phenolic solvents soluble Polyamid-hydantoins optionally containing ester and/or imide and/or isocyanurate groups are obtained by reacting polyisocyanates with polyfunctional amino carboxylic acid derivatives and a compound containing at least a carboxylic group preferably in the presence of a non-phenolic solvent.
    Type: Grant
    Filed: December 5, 1979
    Date of Patent: July 28, 1981
    Assignee: Bayer Aktiengesellschaft
    Inventors: Willi Dunwald, Jurgen Lewalter, Rudolf Merten, Ludwig Rottmaier, Bernhard Schulte, Karl-Heinrich Meyer
  • Patent number: 4269750
    Abstract: A process for the production of compounds containing hydantoin groups by reacting .alpha.-amino-carboxylic acid derivatives and organic isocyanates in the presence of acid groups and either in absence of any solvent or in the presence of a non-phenolic solvent.
    Type: Grant
    Filed: December 5, 1979
    Date of Patent: May 26, 1981
    Assignee: Bayer Aktiengesellschaft
    Inventors: Jurgen Lewalter, Ludwig Rottmaier, Rudolf Merten, Wilfried Zecher, Willi Dunwald, Bernhard Schulte
  • Patent number: 4246393
    Abstract: A process for the preparation of a poly(thio)hydantoin, which comprises reacting an organic isocyanate or isothiocyanate having two or more isocyanate or isothiocyanate moieties with an unsaturated dicarboxylic acid of the formula: ##STR1## at a temperature of from -20.degree. C. to +500.degree. C., wherein R.sub.1 and R.sub.2 are hydrogen, halogen, substituted or unsubstituted aliphatic, aliphatic-aromatic, aromatic or heterocyclic.
    Type: Grant
    Filed: November 8, 1978
    Date of Patent: January 20, 1981
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wilfried Zecher, Jurgen Lewalter, Rudolf Merten, Willi Dunwald
  • Patent number: 4212982
    Abstract: Polyiso(thio)cyanates containing a (thio)hydantoin ring substituted by carboxylic acid amide groups in the molecule are obtained by reacting optionally substituted ethylene- 1,2-dicarboxylic acid anhydrides with amino alcohols and an excess of polyiso (thio) cyanates.
    Type: Grant
    Filed: November 8, 1978
    Date of Patent: July 15, 1980
    Assignee: Bayer Aktiengesellschaft
    Inventors: Jurgen Lewalter, Rudolf Merten, Wilfried Zecher, Willi Dunwald