Patents Assigned to DSM
  • Liquid photocurable resin composition
    Patent number: 5998497
    Abstract: A liquid photocurable resin composition having excellent applicability in a high speed drawing condition and high curability, providing a stable coating film which generates little hydrogen gas when used as a coating material for optical fiber. The liquid photocurable resin composition comprises 10-80 wt % of a polymer having an ether bond or an ester bond, and an ethylenically unsaturated group; 5-50 wt % of at least one monomer according to the formula ##STR1## wherein R.sup.9 is a hydrogen atom or a methyl group, R.sup.10 is an alkylene group having 2-4 carbon atoms, and n denotes an integer from 1-10; 0.1-10% by weight of a photopolymerization initiator; and optionally other compounds comprising one or more ethylenically unsaturated groups.
    Type: Grant
    Filed: May 28, 1998
    Date of Patent: December 7, 1999
    Assignees: DSM N.V., JSR Corporation
    Inventors: Miyuki Ishikawa, Takashi Ukachi
  • Composition comprising a plastic and an additive
    Patent number: 5998565
    Abstract: The invention relates to a composition comprising a plastic and an additive, the additive being present in a dendrimer having functional end groups, said functional end groups being provided, at least in part, with a modifying group, which modifying group is compatible with the plastic. The additive remains trapped in the dendrimer and, owing to the presence of the modifying group on the dendrimer, cannot migrate or bleed from the plastic.
    Type: Grant
    Filed: May 28, 1998
    Date of Patent: December 7, 1999
    Assignee: DSM N.V.
    Inventors: Ellen Marleen M. de Brabander-van den Berg, Peter Ernst Froehling, Sandra Stevelmans, Jan C. M. Van Hest
  • Halogen free flame retardant sheeting
    Patent number: 5998519
    Abstract: The invention relates to a plastic sheeting which is suitable, in particular, for application in the construction industry.It is obtained by employing thermoplastic elastomers and has good humidity-regulating properties and water impermeability. Flame retardancy in accordance with DIN 4102 B2 is obtained by employing melamine, melamine compounds or melamine condensates in the thermoplastic elastomer composition for the sheeting.
    Type: Grant
    Filed: June 22, 1998
    Date of Patent: December 7, 1999
    Assignee: DSM N.V.
    Inventors: Henricus J. J. Goertz, Richerdes J. M. Hulskotte, Reinoldus J. M. Borggreve
  • Aqueous coating dispersion, process for the preparation thereof and use thereof in anticorrosive paint
    Patent number: 5993695
    Abstract: The invention relates to an aqueous coating dispersion comprising at least electrically conductive particles, which particles comprise at least a first binder, a conductive polymer and a non-ionic stabilizer, characterized in that the coating dispersion contains 50 to 99 wt. %, relative to the total amount of solids present, of a second binder, which second binder does not form part of the electrically conductive particles. The invention also relates to a process for the preparation of the aqueous coating dispersion and to the use thereof in an anticorrosive paint, to the anticorrosive paint based on the aqueous coating dispersion according to the invention and to the metals protected herewith.
    Type: Grant
    Filed: July 22, 1997
    Date of Patent: November 30, 1999
    Assignee: DSM N.V.
    Inventors: Markus A.M.M. van Doorn, Johan F.G.A. Jansen
  • Process for the purification of phosphorus oxychloride
    Patent number: 5993609
    Abstract: A process for the purification of recovered or regenerated phosphorus oxychloride contaminated by reactive organic compounds, by reacting the contaminated phosphorus oxychloride with from 0.1 to 5% by weight of an organic amine, having 1 or 2 tertiary N-atoms and a boiling point above the boiling point of phosphorus oxychloride, at the boiling temperature of the reaction mixture and subsequently carrying out fractional distillation at atmospheric pressure to obtain purified phosphorus oxychloride.
    Type: Grant
    Filed: September 2, 1998
    Date of Patent: November 30, 1999
    Assignee: DSM Fine Chemicals Austria GmbH
    Inventors: Karl Schwendinger, Engelbert Kloimstein
  • Cloning and expression of DNA molecules incoding arabinan-degrading enzymes of fungal origin
    Patent number: 5989887
    Abstract: The present invention provides the cloning and expression of purified and isolated DNA molecules, obtainable from fungi, which encode enzymes having arabinan-degrading activity. The present invention also provides DNA constructs containing these DNA molecules and methods for their enhanced expression in selected microbial host cells. The present invention further provides methods for the use of the thus-produced arabinan-degrading enzymes.
    Type: Grant
    Filed: August 18, 1997
    Date of Patent: November 23, 1999
    Assignee: DSM N.V.
    Inventors: Margaretha Van Heuvel, Janna Gardina Bakhuis, Yves Coutel, Abraham Harder, Leendert Hendrik De Graaff, Michel Johannes Anthonie Flipphi, Peter Van Der Veen, Jacob Visser, Peter Michael Andreoli
  • Indenyl compounds and catalyst components for the polymerization of olefins
    Patent number: 5990253
    Abstract: The invention relates to an indenyl compound of the general formulaR'Ind--M--(Cp)Q.sub.kin which the symbols have the following meanings:Ind: an indenyl groupR': a substituent, other than hydrogen, to the Ind group,Cp: a cyclopentadienyl groupM: a transition metal from group 3, 4, 5 or 6 of the Periodic System of ElementsQ: a ligand to Mand k is an integer linked to the valence of M.The invention is characterized in that the R' group is bound to the Ind group at the 2-position. The indenyl compound is a catalyst component for the polymerization of olefins. The invention also relates to polymers obtainable with such indenyl compounds.
    Type: Grant
    Filed: March 10, 1997
    Date of Patent: November 23, 1999
    Assignee: DSM N.V.
    Inventors: Johannus A. M. van Beek, Johannes G. de Vries, Henricus J. Arts, Radjindrakumar Persad, Gerardus H. J. van Doremaele
  • Compatibilized silica and polymer silica-reinforced masterbatch containing same
    Patent number: 5985953
    Abstract: A compatibilized silica for incorporation into natural and synthetic polymers in latex form or dry blending operations is described. Said compatibilized silica is formed by the reaction of precipitated or fumed silica with organosilicon coupling compounds in aqueous suspension. Polymer-silica reinforced masterbatches are prepared by addition of the compatibilized silica slurry to natural and synthetic polymer latices. Also described is a process for preparing the compatibilized silica.
    Type: Grant
    Filed: October 17, 1997
    Date of Patent: November 16, 1999
    Assignee: DSM Copolymer, Inc.
    Inventors: John W. Lightsey, David J. Kneiling, John M. Long, Andrew C. Kolbert
  • Catalyst composition and process for the polymerization of an olefin
    Patent number: 5986029
    Abstract: The invention relates to a new catalyst composition which is suitable for the polymerization of an olefin and which comprises a reduced transition metal complex and a co-catalyst. The invention is characterized in that the transition metal complex consists of a reduced transition metal, chosen from groups 4-6 of the Periodic Table of the Elements, with a multidentate monoanionic ligand and with two monoanionic ligands. In particular the reduced transition metal is titanium (Ti).
    Type: Grant
    Filed: April 30, 1997
    Date of Patent: November 16, 1999
    Assignee: DSM N.V.
    Inventors: Johannes A. M. van Beek, Gerardus H. J. van Doremaele, Gerardus J. M. Gruter, Henricus J. Arts, Guillaume H. M. R. Eggels
  • Liquid curable resin compositions
    Patent number: 5986018
    Abstract: A liquid curable resin composition comprising a dialkylpolysiloxane particles with at least two urethane bonds and/or urea bonds in the terminal groups. The resin composition exhibits superior shelf life in a liquid state and produces cured products having a slippery surface. It is suitable as a coating material for optical fibers, particularly as a ribbon matrix material and a bundling material.
    Type: Grant
    Filed: February 20, 1998
    Date of Patent: November 16, 1999
    Assignees: DSM N.V., JSR Corporation
    Inventors: Yoshikazu Yamaguchi, Zen Komiya, Takashi Ukachi
  • Polymer composition containing condensation product of melamine
    Patent number: 5985960
    Abstract: A process for the preparation of a melamine condensation product comprising the step of heating a starting material comprising melamine or a melamine salt in the presence of: (i) at least one organic acid, (ii) at least one ammonia or melamine salt of the organic acid, or (iii) a mixture of (i) and (ii), under reaction conditions effective for the formation of the melamine condensation product. The melamine condensation product with a residual condensation agent content of less than 1 wt. % is useful in a moldable polymer composition possessing flame-retardant properties.
    Type: Grant
    Filed: June 2, 1997
    Date of Patent: November 16, 1999
    Assignee: DSM N.V. Octroolbureau
    Inventors: Augustinus E. H. de Keijzer, Bernardus J. H. Dijkstra
  • Photo-curable resin composition used for photo fabication of three-dimensional objects
    Patent number: 5981616
    Abstract: A photocurable resin composition suitable for photo-fabrication. The resin composition capable of being promptly cured by photo-irradiation, thereby reducing fabricating time and providing cured products having excellent mechanical strength and minimized shrinkage during curing to ensure high dimensional accuracy. The composition includes (A) an oxetane compound, (B) an epoxy compound, and (C) a cationic photo-initiator.
    Type: Grant
    Filed: December 12, 1997
    Date of Patent: November 9, 1999
    Assignees: DSM N.V., JSR Corporation, Japan Fine Coatings Co., Ltd.
    Inventors: Tetsuya Yamamura, Tsuyoshi Watanabe, Akira Takeuchi, Takashi Ukachi
  • Radiation-curable compositions having fast cure speed and good adhesion to glass
    Patent number: 5977202
    Abstract: A radiation-curable composition for use as an optical fiber material or coating comprising the combination of the following pre-mixture ingredients:(A) about 5 wt. % to about 95 wt. % of one or more radiation-curable oligomers,(B) about 5 wt. % to about 95 wt. % of one or more monomer diluents,(C) optionally, one or more photoinitiators,(D) about 0.1 wt. % to about 30 wt. % of one or more adhesion promoters represented by:(R.sup.1 --L).sub.4-X --Si(OR.sup.2).sub.Xwherein R.sup.1 is a group comprising an ethylenically unsaturated radiation-curable group; and said three R.sup.2 groups independently of each other are C.sub.1 -C.sub.10 groups; wherein X=1-3; and L is a linking group which comprises one or more alkoxy or branched propoxy groups.
    Type: Grant
    Filed: September 22, 1997
    Date of Patent: November 2, 1999
    Assignee: DSM N.V.
    Inventors: Chander P. Chawla, Paul E. Snowwhite, Edward P. Zahora
  • Optical forming apparatus for forming three-dimensional objects
    Patent number: 5976448
    Abstract: An optical forming apparatus which can form a homogeneous three-dimensional object exhibiting desired properties over all parts, while effectively suppressing sedimentation of filler even though the filler is easily precipitated in a photo-curable resin composition. The optical forming apparatus can produce a three-dimensional object consisting of laminated layers of cured resin produced by repetition of forming cured resin layers by selectively irradiating a photo-curable liquid resin composition placed in a container (20), wherein the apparatus is characterized by having a means (60) for circulating the photo-curable liquid resin composition.
    Type: Grant
    Filed: November 24, 1998
    Date of Patent: November 2, 1999
    Assignees: DSM N.V., JSR Corporation, Japan Fine Coatings Co., Ltd.
    Inventors: Yuichi Haruta, Ayao Matsumura, Tsuyoshi Watanabe, Takashi Ukachi
  • Process for preparing .alpha.-amino acid amides, .alpha.-amino acids and derivatives thereof
    Patent number: 5977406
    Abstract: The invention relates to a process for preparing .alpha.-amino acid amides, the corresponding .alpha.-amino acids, or salt thereof, which are substituted at the .beta.-site with at least one (hetero)aromatic group. This is achieved according to the invention by subjecting a 4-carbamoyl-2-oxazolidinone compound, respectively a 4-carboxy-2-oxazolidinone compound, wherein each of them is substituted at the 5-site with at least one (hetero)aromatic group, to a treatment with H.sub.2 in the presence of a catalyst. The invention also relates to a process for preparing a 4-carbamoyl-2-oxazolidinone compound substituted at the 5-site with at least one (hetero)aromatic group, in which process an .alpha.-amino-.beta.-hydroxy-propane nitrile substituted at the .beta.-site with at least one (hetero)aromatic group, or a salt thereof, is subjected to a treatment in the presence of CO.sub.2 and a base.
    Type: Grant
    Filed: November 20, 1997
    Date of Patent: November 2, 1999
    Assignee: DSM NV
    Inventors: Patrick H. M. Delanghe, Anna M. C. F. Castelijns, Paulus L. Alsters
  • Astaxanthin-producing yeast cells, methods for their preparation and their use
    Patent number: 5972642
    Abstract: An isolated pure culture of a strain of the yeast Phaffia rhodozyma which produces large amounts of astaxanthin, in excess of about 600 micrograms per gram of Phaffia rhodozyma dry matter, as determined by HPLC analysis, is disclosed.
    Type: Grant
    Filed: December 12, 1997
    Date of Patent: October 26, 1999
    Assignee: DSM N.V.
    Inventors: Bent Flen.o slashed., Ib Christensen, Robert Larsen, Steffen Radich Johansen, Eric A. Johnson
  • Process to prepare .epsilon.-caprolactam from 6-aminocaproic acid
    Patent number: 5973143
    Abstract: Process to prepare .epsilon.-caprolactam starting from a liquid aqueous mixture containing an alcohol and 6-aminocaproic acid by cyclization of 6-aminocaproic acid in the aqueous mixture at an elevated temperature. The alcohol is separated from the starting aqueous mixture before performing the cyclization to such extent that the concentration of alcohol in the aqueous mixture during the cyclization is less than 1 wt. %. The advantages include reduced amounts of undesirable by-product.
    Type: Grant
    Filed: August 21, 1998
    Date of Patent: October 26, 1999
    Assignee: DSM N.V.
    Inventors: Rudolf P. M. Guit, Samuel L. Lane, Wim Buijs
  • Electrical and electronic components made of a polyamide composition
    Patent number: 5965689
    Abstract: The invention relates to electrical and electronic components made of a polyamide composition and possessing an improved resistance under soldering conditions, particularly when the surface mounting technique is used. This is achieved by using a polyamide composition whose main chain essentially consists of units derived from aliphatic dicarboxylic acids and diamines or .alpha.,.omega.-amino acids, and in which 1-40% of the chain units are derived from 1,6-cyclohexanedicarboxylic acid and an aliphatic diamine, or from 1,4-cyclohexanediamine and an aliphatic dicarboxylic acid.As a result, the temperature at which blisters are formed during soldering by the infrared method is 20-30.degree. C. higher than in the case of the homo-polyamide.
    Type: Grant
    Filed: March 19, 1998
    Date of Patent: October 12, 1999
    Assignee: DSM N.V.
    Inventors: Cornelis E. Koning, Petronella M. Knape, Robert M. Leeuwendal, Josefina M. A. Schiffer
  • Process for the preparation of 3-pentenoic acid from butadiene using a nickel catalyst
    Patent number: 5962732
    Abstract: Process for making 3-pentenoic acid by reacting butadiene with carbon monoxide in the presence of nickel and an iodide source.
    Type: Grant
    Filed: December 17, 1998
    Date of Patent: October 5, 1999
    Assignees: E. I. du Pont de Nemours and Company, DSM N.V.
    Inventor: Patrick Michael Burke
  • Radiation-curable, optical glass fiber coating composition and optical glass fiber drawing method
    Patent number: 5958584
    Abstract: Provided is a radiation-curable, optical glass fiber coating composition containing at least one radiation-curable oligomer or monomer, and at least one chromophoric indicator selected so as to be susceptible to destruction of its chromophoric characteristic upon exposure to radiation and present in an amount which becomes substantially colorless when exposed to a level of radiation sufficient to cure said radiation-curable, optical glass fiber coating composition, wherein said at least one chromophoric indicator has a color which is distinguishable from a base color of said radiation-curable, optical glass fiber coating composition in cured form. The invention also provides a method of making the coating composition. The invention further provides a coated optical glass fiber and a method of making a coated optical glass on a fiber drawing tower. Also provided is a cable and telecommunications system.
    Type: Grant
    Filed: July 22, 1996
    Date of Patent: September 28, 1999
    Assignee: DSM NV
    Inventor: James R. Petisce