Patents by Inventor Geza Avar

Geza Avar 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).

  • Publication number: 20020115812
    Abstract: A flame retardant composition that is composed of red phosphorus and melamine or a derivative thereof in amounts satisfying a specified ratio for use in the production of polyurethanes. The polyurethanes produced with this flame retardant composition are particularly useful in the production of rail vehicles.
    Type: Application
    Filed: May 18, 1999
    Publication date: August 22, 2002
    Inventors: GEZA AVAR, THOMAS MUNZMAY, ANDREAS RUCKES, INGO ZAPPEL
  • Patent number: 6235799
    Abstract: The invention provides a process for preparing flexible to semi-rigid polyurethane moulded items with compacted edge zones with given hardness and a much more flexible cellular core, so-called integral foams, in which physical blowing agents from the set comprising C6 hydrocarbons are used.
    Type: Grant
    Filed: November 17, 1999
    Date of Patent: May 22, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Norbert Eisen, Geza Avar, Peter Haas
  • Patent number: 6224797
    Abstract: The invention describes a method for producing reactive plastics molded bodies with a high proportion of coarse-grained filler, in which the coarse-grained filler is heated to an elevated temperature before being fed into the mold.
    Type: Grant
    Filed: June 17, 1999
    Date of Patent: May 1, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Reinhold Franzen, Anthony Martinus Jacobus van Staveren, G├ęza Avar
  • Patent number: 5342855
    Abstract: This invention relates to a process for the preparation of stable dispersions of hydroxyl-containing polyhydrazodicarbonamides in a hydroxyl-containing compound. The dispersions are prepared by the reaction of organic isocyanates, isocyanate-reactive compounds having a molecular weight in the range from 400 to 10,000, relatively low molecular weight isocyanate-reactive compounds, and hydrazines or hydrazides. This invention further relates to the dispersions prepared by said process, the use of the dispersions to prepare polyurethane foams having exceptional hardness, and the foams prepared thereby.
    Type: Grant
    Filed: January 23, 1990
    Date of Patent: August 30, 1994
    Assignee: Miles Inc.
    Inventors: Michael A. Lucarelli, Richard E. Keegan, Mark A. Koshute, Hans-Albrecht Freitag, Geza Avar
  • Patent number: 5179146
    Abstract: Modified polyisocyanates having an NCO group content of from 10 to 45% by weight, comprising a a) a polyisocyanate component consisting essentially of an organic polyisocyanate having an NCO group content of from 15 to 50% by weight which is liquid at room temperature, and b) 2 to 100% by weight, based on the weight of component a), of a polymer modifier consisting of at least one graft rubber which is dispersed in swollen form in component a), and a process for the production of the new modified polyisocyanates are described. The modified polyisocyanates are also useful in the production of plastics by the isocyanate polyaddition process.
    Type: Grant
    Filed: March 30, 1992
    Date of Patent: January 12, 1993
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hanns-Peter Muller, Geza Avar, Christian Weber, Karl-Heinz Dorner, Alexander Karbach, Christian Lindner, Rolf Dhein
  • Patent number: 4824595
    Abstract: The present invention relates to polyisocyanate compositions containing reversibly blocked catalysts for the isocyanate addition reaction, characterized in that they contain(a) at least one organic polyisocyanate,(b) at least one addition product dissolved or dispersed in the polyisocyanate compositions, of a sulfonyl isocyanate with a tertiary amine and/or with a catalyst having a tin(II)- or tin(IV)-carboxylate structure as the reversibly blocked catalyst.The present invention also relates to a process for producing these polyisocyanate compositions and to the use of new polyisocyanate compositions as reactants for compounds containing isocyanate-reactive groups for the production of isocyanate addition products such as polyurethane plastics using a one-component or two-component principle. The present invention finally relates to the latent polyurethane catalysts prepared from a sulfonyl isocyanate and a tin(II)- or tin(IV)-carboxylate.
    Type: Grant
    Filed: July 23, 1984
    Date of Patent: April 25, 1989
    Assignee: Bayer Aktiengesellschaft
    Inventors: Roland Richter, Hanns P. Muller, Rudolf Hombach, Manfred Dollhausen, Geza Avar, Hans-Albrecht Freitag
  • Patent number: 4775558
    Abstract: Polyurethanes which have been prepared or combined with another material are made by combining or applying a polyurethane-forming reaction mixture or polyurethane to another material such as a PVC foil or textile. The polyurethane-forming mixture or polyurethane is made up of an organic polyisocyanate, a high molecular weight isocyanate reactive material, a catalyst and a stabilizer against thermolysis and contact discoloration. The required stabilizer is an epoxide having an epoxide equivalent weight between 57 and 10,000. Other additives commonly used in polyurethane chemistry such as blowing agents, chain extenders and surfactants may also be employed. The polyurethane composites thus produced are characterized by improved thermal stability and reduced discoloration.
    Type: Grant
    Filed: September 17, 1987
    Date of Patent: October 4, 1988
    Assignee: Bayer Aktiengesellschaft
    Inventors: Peter Haas, Geza Avar
  • Patent number: 4761307
    Abstract: The present invention is directed to a process for the production of optionally foamed polyurethanes which are combined or fabricated with another material, comprising reacting compounds with molecular weights from 400 to 10,000 containing at least 2 isocyanate reactive hydrogen atoms with polyisocyanates in the presence of catalysts containing tertiary amino groups and combining or fabricating the resulting polyurethane with another material, characterized in that the catalysts used are diffusion resistant aminoalkanols corresponding to the general formula ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 may be identical or different and represent hydrogen or a C.sub.1 -C.sub.6 alkyl group,R.sup.5, R.sup.6, R.sup.7 and R.sup.8 may be identical or different and represent a C.sub.1 -C.sub.6 alkyl group or together form a C.sub.2 -C.sub.6 alkylene group which may contain hetero atoms such as O or NR (R=C.sub.1 -C.sub.4 alkyl), and n and m may be identical or different and represent integers from 1 to 6.
    Type: Grant
    Filed: January 8, 1986
    Date of Patent: August 2, 1988
    Assignee: Bayer Aktiengesellschaft
    Inventors: Peter Haas, Hans-Albrecht Freitag, Geza Avar
  • Patent number: 4644017
    Abstract: Composite polyisocyanate addition products are formed from (1) the reaction product of a compound having at least two isocyanate-reactive hydrogen atoms and a molecular weight of from 400 to 10,000, a polyisocyanate and a catalyst which is a diffusion stable amino alkyl urea having tertiary amino groups and corresponds to the formula ##STR1## in which R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7 and n each represent specified groups or values and (2) another different material such as polyvinyl chloride, ABS, lacquers and textiles. Known additives such as blowing agents, chain extenders and foam stabilizers may optionally be used in the production of reaction product (1).
    Type: Grant
    Filed: September 12, 1985
    Date of Patent: February 17, 1987
    Assignee: Bayer Aktiengesellschaft
    Inventors: Peter Haas, Hans-Albrecht Freitag, Geza Avar, Claus-Dieter Sommerfeld, Hans-Walter Illger
  • Patent number: 4546121
    Abstract: This invention relates to the use of mono- to tetrahydroxyalkyl monoureas corresponding to the following general formula ##STR1## in which A represents a C.sub.2 -C.sub.6 -alkylene group optionally containing OH-groups,n=0, 1 or 2.n'=1 or 2 andn+n'=1, 2, 3 or 4, preferably 2-4 and, more preferably, 3,as reactive flameproofing agents in quantities of from 3 to 100 parts by weight and preferably in quantities of from 11.5 to 50 parts by weight, based on 100 parts by weight of relatively high molecular weight compounds having molecular weights of from 400 to 10,000, preferably relatively high molecular weight polyols, for the production of flameproofed polyurethane foams, and preferably integral skin foams or semirigid to rigid foams. The invention also relates to dispersions or suspensions of mono- to tetrapolyhydroxyalkyl monoureas corresponding to the above formula in relatively high molecular weight compounds containing terminal hydroxyl, primary or secondary amino, carboxyl or hydrazide groups.
    Type: Grant
    Filed: August 29, 1984
    Date of Patent: October 8, 1985
    Assignee: Bayer Aktiengesellschaft
    Inventors: Peter Haas, Geza Avar, Hartwig Grammes
  • Patent number: 4540626
    Abstract: The invention relates to the use of poly-N,N-di-(hydroxyalkyl)-polycarbonamides of aliphatic or cycloaliphatic polycarboxylic acids as reactive flame-retardants for polyurethane foams, and in particular polyurethane integral skin foams and polyurethane rigid foams which are produced with the aid of organic blowing agents. These reactive flame-retardants are added in quantities of from 11.5 to 50 parts by weight, and most preferably from 12 to 25 parts by weight, based on 100 parts of the relatively high molecular weight polyol used for the preparation of the foam. The integral skin or rigid foams produced are flame-resistant and because of their reduced flammability are capable of passing various regulation fire tests, and in particular those testing foams for use in vehicles for transport.
    Type: Grant
    Filed: August 29, 1984
    Date of Patent: September 10, 1985
    Assignee: Bayer AG
    Inventors: Peter Haas, Geza Avar, Hartwig Grammes
  • Patent number: 4478893
    Abstract: Polyisocyanate addition products are made by reacting a polysiloxane having isocyanate reactive end groups, excess polyisocyanate and a compound selected from the group consisting of aliphatic alcohols, primary aliphatic amines, secondary aliphatic amines and mixtures thereof having a molecular weight of from 75 to 5000 and at least one tertiary amino group and/or oxyalkylene unit. In a preferred embodiment, the polysiloxane is reacted with excess polyisocyanate and the reaction product is subsequently reacted with the alcohol and/or amine. The addition products of this invention are particularly useful as mold release agents in the production of molded lacquer coated plastics by the "in-mold coating process.
    Type: Grant
    Filed: October 6, 1983
    Date of Patent: October 23, 1984
    Assignee: Bayer Aktiengesellschaft
    Inventors: Manfred Schonfelder, Peter Haas, Geza Avar, Helmut Steinberger
  • Patent number: 4390640
    Abstract: This invention relates to a process for the production of polyurethanes, particularly polyurethane foam moldings having a compact skin and a cellular core, using special tin activators.
    Type: Grant
    Filed: January 25, 1982
    Date of Patent: June 28, 1983
    Assignee: Bayer Aktiengesellschaft
    Inventors: Werner Rasshofer, Geza Avar, Hans-Albrecht Freitag, Gerhard Grogler, Richard Kopp