Abstract: A process for efficiently producing a hollow molding or a sheet- or rod-shaped molding includes subjecting a composition containing a polyoxymethylene copolymer resin having substantially a linear molecular structure and a melt flow index (MI) value (190.degree. C., 2160 g load) of 0.1 to 2.0 g/10 min to blow -molding or extrusion-molding operations. The preferred polyoxymethylene copolymer is prepared by copolymerizing trioxane as the principle monomer with a cyclic ether or cyclic formal comonomer in the presence of 1.times.10.sup.-3 to 1.times.10.sup.-2 molar % of a boron trifluoride catalyst or a coordination compound thereof, while regulating the chain-terminating or chain-transferring impurities in the reaction system to 1.times.10.sup.-2 molar % or less, and then cooling the product obtained to a temperature of 45.degree. or below within 30 seconds so as to deactivate the catalyst.
Abstract: A process is disclosed for maximizing the brightness of wood pulps which have been treated with anionic bleaching agents wherein the brightness is enhanced by the use of selected quaternary ammonium compounds.
Abstract: A purification process for cyclic formals, in which water is efficiently removed from a mixture of a cyclic formal and water which is difficult to be separated from the mixture, thereby obtaining a cyclic formal of high purity which contains only an extremely small amount of water.The purification process for cyclic formals is characterized by the steps of supplying a mixture of a cyclic formal and water into a distillation tower, effecting distillation while supplying n-pentane into the distillation tower and taking out a purified cyclic formal as a bottom liquid.
Abstract: Polypeptides having a carboxamide carboxyl terminal end and a methionine residue, which is optionally bonded to a bacterial protein, on the amino end can be prepared by synthesis by genetic engineering methods of the corresponding polypeptide having at the C terminal end a glycine residue, and conversion of the latter enzymatically into the amino group of the desired carboxamide group. Peptides which have the aminoacid sequence of growth hormone releasing factor, part sequences thereof, or modifications of these peptides, are readily accessible by this means. The synthesis by genetic engineering methods is advantageously carried out via two gene fragments which are synthesized chemically from smaller, single-stranded structural units. The two gene fragments are then linked enzymatically to give the complete gene, which is incorporated into a suitable vector, amplified there, and the peptide is isolated directly or as a fused protein, and is converted enzymatically into the desired amide.
Type:
Grant
Filed:
March 4, 1994
Date of Patent:
October 10, 1995
Assignee:
Hoechst Aktiengesellschaft
Inventors:
Joachim Engels, Wolfgang Konig, Hubert Mullner, Eugen Uhlmann, Waldemar Wetekam
Abstract: A process for disposing of bromofluorocarbons, bromochlorofluorocarbons, or mixtures of any of bromofluorocarbons, bromochlorofluorocarbons, fluorocarbons, or chlorofluorocarbons. The process comprises thermally cleaving halons, halon-containing fluorocarbons, or halon containing chlorofluorocarbons, cooling the resulting gas stream, oxidizing the resulting hydrogen bromide to bromine by feeding excess elemental chlorine into the gas stream, absorbing the resulting HF or HCl from the gas stream with recovery of hydrofluoric acid or hydrochloric acid, and finally separating elemental bromine and chlorine from each other by distillation or reducing both to give the salts.
Abstract: Arylketoamines are prepared by reacting arylisonitrosoalkanones with hydrogen in the presence of a transition metal catalyst and a liquid carboxylic acid at a temperature of less than about 60.degree. C.
Type:
Grant
Filed:
August 23, 1994
Date of Patent:
October 10, 1995
Assignee:
Hoechst Celanese Corporation
Inventors:
Ahmed M. Tafesh, George Kvakovszky, Charlet R. Lindley
Abstract: The invention is a dye composition containing two or more dyes of the vinyl sulfone type which can be used in combination to dye polyamide substrates. Preferably the dye compositions of the invention contain at least three dyes of different primary colors.
Type:
Grant
Filed:
May 24, 1994
Date of Patent:
October 10, 1995
Assignee:
Hoechst Celanese Corporation
Inventors:
Walter Heimling, Mark Helle, Kerry Proulx, Leslie McIntosh, Philomen DeCroos
Abstract: The present invention relates to a process for the production of crystalline sodium sheet silicate with kanemite structure with the chemical formulaNaH Si.sub.2 O.sub.5 .multidot.X H.sub.2 Oin which X represents a value between 1 and 3. Crystalline sodium sheet silicate with kanemite structure is produced by maintaining a mixture of sodium disilicate, silica and water in the molar ratio of 1:2:(6-8) at a temperature of 20.degree. to 100.degree. C. for a period of 0.2 to 10 h.
Type:
Grant
Filed:
May 18, 1994
Date of Patent:
October 10, 1995
Assignee:
Hoechst Aktiengesellschaft
Inventors:
Alexander Tapper, Renate Adrian, Gunther Schimmel
Abstract: To prepare a phase-pure, ceramic oxide superconductor which contains, in addition to copper, at least one alkaline earth metal from the group comprising Ba, Sr and Ca, and at least one metal from the group comprising Y, La, Tl, Pb and the rare earths, for example of YBa.sub.2 Cu.sub.3 O.sub.7-x, a solution is prepared which contains the metal components in the atomic ratios of the superconductor. The metals are precipitated as oxalates by combining this solution with an oxalic acid solution, the mixture of the oxalates is separated off, dried and decomposed to form the oxides, and the latter are subsequently sintered at temperatures of from 700.degree. to 900.degree. C. in the presence of oxygen to form the superconductor. In this process, the heating of the metal oxalates and the oxides formed therefrom up to 700.degree. C. is carried out at a maximum oxygen partial pressure of 50 mbar, preferably in an inert gas.
Abstract: N1-Substituted 1H-1,2,3-triazolo[4,5-d]pyrimidine compounds of the formula I ##STR1## in which the substituents X, Y, R.sup.1, R.sup.2 and R.sup.3 have the meanings recited in the specification, are described as pharmaceutical compositions containing them and processes for their preparation. The compounds are effective antiviral agents.
Type:
Grant
Filed:
September 23, 1993
Date of Patent:
October 10, 1995
Assignee:
Hoechst Aktiengesellschaft
Inventors:
Gerhard Jaehne, Matthias Helsberg, Irvin Winkler, Gerhard Gross, Thomas Scholl
Abstract: This invention relates to compounds of the formula ##STR1## where R.sub.1 -R.sub.6, X and Y are as defined in the specification, which are useful for the treatment of various memory dysfunctions characterized by a cholinergic deficit and thus may be indicated in the treatment of Alzheimer's disease.
Type:
Grant
Filed:
May 25, 1994
Date of Patent:
October 3, 1995
Assignee:
Hoechst-Roussel Pharmaceuticals Inc.
Inventors:
Richard C. Effland, Larry Davis, Gordon E. Olsen
Abstract: A needlepunch fabric of staple polyester fibers is disclosed that is elastomeric and has foam-like compressibility and resilience. The polyester staple is formed of fibers having a differential birefringence. Mechanically crimped fibers are carded, crosslapped, and needlepunched to from about 150 to 1500 ppsi, and the resultant fabric is heated to from about 120.degree. to 240.degree. C. to induce a latent crimp in the fabric and to develop the elastomeric and foam-like properties of the fabric.
Abstract: A preexposure device having a linear LED arrangement for preexposing printing forms over their full area. The linear LED arrangement comprises at least two rows of LED modules which are offset with respect to one another. Each module is made up of a plurality of light-emitting diodes. The linear LED arrangement is disposed within a housing which is closed off at the bottom by means of a light scattering plate.
Type:
Grant
Filed:
July 28, 1993
Date of Patent:
October 3, 1995
Assignee:
Hoechst Aktiengesellschaft
Inventors:
Rudolf Zertani, Helmuth Haberhauer, Norbert Kraemer
Abstract: Process for the preparation of an olefin polymer using metallocenes containing specifically substituted indenyl ligandsA highly effective catalyst system for the polymerization of olefins comprises a cocatalyst, preferably an aluminoxane, and a metallocene of the formula I ##STR1## in which, preferably M.sup.1 is Zr or Hf, R.sup.1 and R.sup.2 are alkyl or halogen, R.sup.5 is hydrogen or alkyl, R.sup.3 and R.sup.4 are alkyl, where R.sup.3, R.sup.4 and R.sup.5 may be halogenated, --(CR.sup.7 R.sup.8).sub.m --R.sup.6 --(CR.sup.7 R.sup.8).sub.n -- is a single- or multi-membered chain in which R.sup.6 may also be a (substituted) heteroatom, and m+n is zero or 1.
Type:
Grant
Filed:
August 3, 1993
Date of Patent:
October 3, 1995
Assignee:
Hoechst AG
Inventors:
Andreas Winter, Frank Kueber, Walter Spaleck, Herbert Riepl, Wolfgang A. Herrmann, Volker Dolle, Juergen Rohrmann
Abstract: Metallocenes having benzo-fused indenyl derivatives as ligands, processes for their preparation and their use as catalysts A very effective catalyst system for olefin polymerization comprises a cocatalyst, preferably an aluminoxane, and a metallocene of the formula I ##STR1## in which, preferably, M.sup.1 is Zr or Hf, R.sup.1 and R.sup.2 are halogen or alkyl, R.sup.3 is alkyl, R.sup.4 to R.sup.10 are alkyl or hydrogen and R.sup.11 is a (substituted) alkylene or heteroatom bridge.
Type:
Grant
Filed:
January 17, 1995
Date of Patent:
October 3, 1995
Assignee:
Hoechst AG
Inventors:
Jurgen Rohrmann, Volker Dolle, Andreas Winter, Frank Kuber
Abstract: This invention relates to a process for the preparation of a product of the formula ##STR1## wherein R, R.sup.1, R.sup.2, X and m are defined within which process comprises(a) contacting a compound of Formula II ##STR2## wherein R.sup.3 is loweralkyl, with a reagent selective from the group consisting of aluminum chloride, hydrobromic acid and boron tribromide followed by tartaric acid to afford a compound of Formula III ##STR3## wherein R, X and m are as defined above; (b) contacting the reaction mixture containing compound of Formula IV ##STR4## wherein R.sup.4 is hydrogen or loweralkyl in the presence of a carboxylic acid of the formulaR.sup.5 COOHwherein R.sup.5 is loweralkyl to afford a compound of formula V ##STR5## wherein R, R.sup.4, X and m are as above; contacting the reaction mixture containing the compound of Formula V obtained in step(b) with a compound of the formulaR.sup.1 R.sup.2 NHwherein R.sup.1 and R.sup.2 are as above; and isolating the product of Formula I.
Abstract: Super-absorbent polymers having superior dryness properties when incorporated into absorbent articles are made from acrylic acid and crosslinking agent polymerized under controlled conditions.
Type:
Grant
Filed:
June 9, 1993
Date of Patent:
September 26, 1995
Assignee:
Hoechst Celanese Corporation
Inventors:
Douglas R. Chambers, Hubert H. Fowler, Jr., Yoji Fujiura, Fusayoshi Masuda
Abstract: The present invention provides a unique and novel way of producing polyhydroxystyrene which comprises the steps of (a) heating 4-hydroxyacetophenone under suitable hydrogenation conditions of temperature and pressure in the presence of a suitable palladium catalyst and for a sufficient period of time to form 4-hydroxyphenylmethylcarbinol; (b) heating 4-hydroxyphenylmethylcarbinol under suitable conditions of temperature and pressure and for a sufficient period of time to form said polyhydroxystyrene.
Type:
Grant
Filed:
March 1, 1995
Date of Patent:
September 26, 1995
Assignee:
Hoechst Celanese Corporation
Inventors:
James R. Sounik, Graham N. Mott, Charles B. Hilton
Abstract: Moldings of ultra high molecular weight polyethylene powder are produced by heating the polymer powder at 160.degree. to 280.degree. C. in a mold without applying pressure or at a pressure of up to 0.5 MPa, and then cooling it to room temperature at a pressure of from 4 to 20 MPa.