Patents by Inventor Rolf Dhein

Rolf Dhein 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: 4424400
    Abstract: An oligoisobutylcyclohexane of the formula: ##STR1## wherein R.sup.1 -R.sup.5 are identical or different and independently denote hydrogen, a C.sub.1 -C.sub.4 - alkyl group, C.sub.1 -C.sub.4 -alkoxy group or a C.sub.1 -C.sub.4 -alkylthio substitutent and R.sup.6 denotes a branched chain C.sub.12 -C.sub.40 -alkyl group of trimeric to decameric isobutene,a process for preparing such oligoisobutylcyclohexanes and their use as dielectric liquids, lubricants, heat transfer media and the like.
    Type: Grant
    Filed: March 13, 1981
    Date of Patent: January 3, 1984
    Assignee: Bayer Aktiengesellschaft
    Inventors: Karl-Heinz Hentschel, Rolf Dhein
  • Patent number: 4418174
    Abstract: Dianhydromannitol, dianhydrosorbitol, dianhydromannitol semi-esters and dianhydrosorbitol semi-esters are outstanding raw materials for the production of aqueous stoving lacquers based on polyesters.
    Type: Grant
    Filed: April 8, 1982
    Date of Patent: November 29, 1983
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rolf Dhein, Lothar Backer, Jochen Schoeps
  • Patent number: 4413116
    Abstract: Penta- or hexahydric sugar alcohols are outstandingly suitable as a polyol component for the preparation of polyesters or alkyd resins. Secondary reactions resulting in darkening are substantially avoided if as small a quantity as possible of aromatic polycarboxylic acid components is used.
    Type: Grant
    Filed: April 8, 1982
    Date of Patent: November 1, 1983
    Assignee: Bayer Aktiengesellschaft
    Inventors: Knud Reuter, Rolf Dhein, Lothar Fleiter
  • Patent number: 4408027
    Abstract: Process for the production of a suspension of polyacetylene in the form of particles having a diameter of from 0.01 to 1 mm and having a great number of fibrous appendices comprising introducing acetylene in an organic suspending agent under constant stirring, in the presence of an aluminum-containing organometallic mixed catalyst in an amount corresponding to 10 to 100 m moles aluminium per liter suspending agent, at temperatures of from -100.degree. to 80.degree. C., until a maximum of 10 g, preferably 1 to 3 g of polyacetylene per liter of suspending agent have been formed.
    Type: Grant
    Filed: July 31, 1981
    Date of Patent: October 4, 1983
    Assignee: Bayer Aktiengesellschaft
    Inventors: Jurgen Hocker, Wolfgang Wieder, Rolf Dhein
  • Patent number: 4400489
    Abstract: The invention relates to an aerially-crosslinking, pigmented or non-pigmented coating agent consisting of conventional lacquer auxiliaries and an aerially-crosslinking binder which has been reacted to form a dicarboxylic acid semi-ester by the reaction of a copolymer consisting of copolymerized units of at least one ester carrying at least one 1,2-epoxide group or hydroxyl group of an .alpha.,.beta.-monoolefinically unsaturated C.sub.3 -C.sub.5 -carboxylic acid and at least one vinyl or vinylidene monomer which is different therefrom with at least one drying fatty acid and optionally with at least one cyclic dicarboxylic acid anhydride, characterized in that the coating agent contains as an additional lacquer auxiliary from 0.2 to 2% by weight of at least one .alpha.-dicarbonyl compound, based on the aerially-crosslinking binder.
    Type: Grant
    Filed: November 23, 1981
    Date of Patent: August 23, 1983
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rolf Dhein, Lothar Fleiter
  • Patent number: 4397971
    Abstract: A process for the production of a thermoplastically processible polymer granulate or powder containing from 0.01 to 50%, by weight, of burr-shaped or fibrous, doped polyacetylene, in which a plastics material and the doped polyacetylene particles are mixed in the presence of an inert suspending liquid and said liquid is removed.
    Type: Grant
    Filed: March 29, 1982
    Date of Patent: August 9, 1983
    Assignee: Bayer Aktiengesellschaft
    Inventors: Jurgen Hocker, Rolf Dhein
  • Patent number: 4396736
    Abstract: Polyamide moulding compositions containing triazolidine-3,5-diones or reaction products thereof as flame retarding agents.
    Type: Grant
    Filed: June 29, 1981
    Date of Patent: August 2, 1983
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rolf Dhein, Ludwig Rottmaier, Rudolf Merten, Wolfgang Siebourg
  • Patent number: 4367303
    Abstract: Certain solutions of phosphines in oxetane compounds impart oxidative stability to aromatic thermoplastic polycarbonates in which such solutions are admixed.
    Type: Grant
    Filed: June 25, 1981
    Date of Patent: January 4, 1983
    Assignee: Bayer Aktiengesellschaft
    Inventors: Erich Eimers, Rolf Dhein, Wolfgang Cohnen, Engelbert Kuhle, Gerhard Heywang
  • Patent number: 4362635
    Abstract: Esterification products of monoalcohols and dicarboxylic acids, or of polyhydric alcohols and monocarboxylic acids respectively, containing 5 to 45% by weight of units of hydroxycarboxylic acids and having a ratio of carbon to oxygen atoms greater than 4.1 obtained from (a) aliphatic C.sub.1 -C.sub.14 alcohols, (b) aliphatic C.sub.4 -C.sub.18 carboxylic acids and optionally cycloaliphatic C.sub.6 -C.sub.12 and aromatic C.sub.7 -C.sub.12 carboxylic acids, and (c) lactones of aliphatic C.sub.5 -C.sub.12 hydroxycarboxylic acids. They are suitable for the preparation of lubricants and lubricant compositions.
    Type: Grant
    Filed: October 29, 1980
    Date of Patent: December 7, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rolf Dhein, Karl-Heinz Hentschel, Karl Nutzel, Klaus Morche, Wolfgang Schule
  • Patent number: 4346044
    Abstract: Air-drying alkyd resins which are in the form of neutralized semi-esters of hexahydrophthalic acid anhydride constitute an excellent basis for coatings which undergo virtually no yellowing and which, even when aged by heat, show a high constancy of color.
    Type: Grant
    Filed: July 11, 1980
    Date of Patent: August 24, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rolf Dhein, Jochen Schoeps, Rolf Kuchenmeister
  • Patent number: 4340688
    Abstract: Particular maleimides work as gel-inhibitors during the addition reaction of maleic anhydride and diene polymers.
    Type: Grant
    Filed: April 3, 1981
    Date of Patent: July 20, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventors: Michael Rossert, Rolf Dhein
  • Patent number: 4324934
    Abstract: The 1:1-adduct of 1.3-butadiene and dicyclopentadiene is an excellent reactive thinner for air-drying lacquers.
    Type: Grant
    Filed: January 9, 1981
    Date of Patent: April 13, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventors: Erich Eimers, Rolf Dhein
  • Patent number: 4324880
    Abstract: Polyesters having a hydroxyl number of from 50 to 400 and containing 20 to 90% by weight of co-condensed .beta.-hydroxybutyric acid units have proved to yield transparent, glossy, elastic and hard coatings.
    Type: Grant
    Filed: November 24, 1980
    Date of Patent: April 13, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rolf Dhein, Knud Reuter, Hans Rudolph, Jorg Pfitzner
  • Patent number: 4323501
    Abstract: Phosphites of the general formula: ##STR1## in which n.sub.1 is an integer;n.sub.2 is 0 or an integer;n.sub.3 is an integer;at least one of the groups R is an oxetane group as hereinafter defined or a hydrocarbon radical being substituted at least by one oxetane group as hereinafter defined;the remaining groups R are selected from alkyl, aralkyl, cycloalkyl, aryl and hetaryl groups; andthe group or groups Ar are the same or different at-least-divalent aromatic groups the free valencies of which are directly linked to the aromatic nuclei; anda process for their preparation.
    Type: Grant
    Filed: October 18, 1977
    Date of Patent: April 6, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventors: Erich Eimers, Dieter Margotte, Helmut Schmid, Rolf Dhein
  • Patent number: 4321336
    Abstract: High impact polyamide blends consisting of polyamides having a relative viscosity of at least 3, 5 and of at least one polymer taken from the group comprising aliphatic polyolefines, olefinic copolymers of aliphatic monoolefines, (meth)acrylic acid or (meth)acrylic acid esters, copolymers of styrene, (meth)acrylic acid and (meth)acrylic esters, copolymers of aliphatic dienes and acrylonitrile and high molecular weight organic silicon compounds.
    Type: Grant
    Filed: February 19, 1980
    Date of Patent: March 23, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rolf-Volker Meyer, Rolf Dhein, Friedrich Fahnler
  • Patent number: 4321170
    Abstract: Aqueous dispersions of polyesters or alkyd resins for coatings are prepared by co-condensation of 10 to 100 mol-%, calculated on the sum of polybasic carboxylic acids, of polybasic acids whose carboxyl groups are attached to secondary and/or tertiary carbon atoms. Said dispersions are excellently stable and yield coatings with outstanding properties.
    Type: Grant
    Filed: November 14, 1980
    Date of Patent: March 23, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventors: Karl Zabrocki, Rolf Dhein, Franz Weider, Klaus Hohne, Kurt Schorn
  • Patent number: 4307227
    Abstract: Ester-modified polyamides containing of from 50 to 80% by weight of --HN--(CH.sub.2).sub.5 --CO units are obtained by reaction of .gamma.-caprolactam and mixtures of dicarboxylic acids, primary diamines and polyalkylene glycols and are suitable inter alia as hot melt adhesives and for the elastification of thermoplastic materials.
    Type: Grant
    Filed: March 31, 1980
    Date of Patent: December 22, 1981
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rolf-Volker Meyer, Gerhard Hohmann, Hans Rudolph, Rolf Dhein, Manfred Dollhausen
  • Patent number: 4292187
    Abstract: A condensation product from aliphatic or cycloaliphatic polyols, aliphatic saturated or once unsaturated hydroxycarboxylic acids and aliphatic or cycloaliphatic saturated or unsaturated monocarboxylic acids is an effective lubricant for the working of metals, optionally in admixture with other lubricating oils and conventional additives.
    Type: Grant
    Filed: March 6, 1980
    Date of Patent: September 29, 1981
    Assignee: Bayer Aktiengesellschaft
    Inventors: Karl-Heinz Hentschel, Rolf Dhein, Wolfgang Schule
  • Patent number: 4288569
    Abstract: A powder lacquer binder composition which comprises a homogeneous crosslinkable mixture comprising: (A) a polymer containing more than one carboxyl group and having a melting and softening point of from 20.degree. to 150.degree. C. (as determined by differential thermoanalysis) and an acid number of from 10 to 150 mg of KOH/g; and (B) a 1,2-polyepoxide which is N,N',N"-triglycidyl triazolidine-3,5-dione having an epoxide value of from 0.6 to 1.13; the mixture containing from 0.5 to 1.5 1,2-epoxide group per carboxyl group; and a process for the preparation thereof.
    Type: Grant
    Filed: August 29, 1980
    Date of Patent: September 8, 1981
    Assignee: Bayer Aktiengesellschaft
    Inventors: Ludwig Rottmaier, Rudolf Merten, Rolf Dhein, Hans J. Kreuder
  • Patent number: 4287315
    Abstract: Polymer blends with improved impact strength consisting essentially of a polyamide and a copolymer of an .alpha.-olefine, an amide and an ester of an .alpha.,.beta.unsaturated carboxylic acid.
    Type: Grant
    Filed: August 23, 1979
    Date of Patent: September 1, 1981
    Inventors: Rolf-Volker Meyer, Rolf Dhein, Friedrich Fahnler