Patents by Inventor Christiaan J. C. Stoelwinder

Christiaan J. C. Stoelwinder 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: 6326521
    Abstract: Process for the preparation of benzyl alcohol via hydrolysis of a benzyl ester with water in the liquid phase, the hydrolysis being carried out in the absence of a strong acid and a base at a temperature between 40° C. and 320° C. The benzyl ester to be hydrolyzed can be chosen from the group comprising benzyl formiate, benzyl propionate, benzyl acetate and benzyl benzoate. A weak acid may optionally be added to the reaction mixture to be hydrolyzed. After the hydrolysis the reaction mixture is preferably cooled to a temperature between 80° C. and 180° C. so that a phase separation takes place. Both the organic phase and the aqueous phase can be upgraded. As such, benzyl alcohol can be obtained with a high overall yield and a purity of more than 98%.
    Type: Grant
    Filed: December 18, 1998
    Date of Patent: December 4, 2001
    Assignee: DSM N.V.
    Inventors: Jacob Van Soolingen, Alexander P. M. Vrinzen, Christiaan J. C. Stoelwinder, Abram Peet, Hendricus J. Rozie, Otto G. Plantema
  • Publication number: 20010014762
    Abstract: Process for the preparation of benzyl alcohol via hydrolysis of a benzyl ester with water in the liquid phase, the hydrolysis being carried out in the absence of a strong acid and a base at a temperature between 40° C. and 320° C. The benzyl ester to be hydrolyzed can be chosen from the group comprising benzyl formiate, benzyl propionate, benzyl acetate and benzyl benzoate. A weak acid may optionally be added to the reaction mixture to be hydrolyzed.
    Type: Application
    Filed: December 18, 1998
    Publication date: August 16, 2001
    Inventors: JACOB VAN SOOLINGEN, ALEXANDER P.M. VRINZEN, CHRISTIAAN J.C. STOELWINDER, ABRAM PEET, HENDRICUS ROZIE
  • Patent number: 5698662
    Abstract: The invention relates to a dendritic macromolecule with branches prepared from halogen cyanide units composed of a monohalogenated hydrocarbon compound comprising 3-50 carbon atoms and at least one cyanide group, the halogen and the cyanide group being separated from one another by at least 3 carbon atoms. The invention also relates to a process for the preparation of a dendritic macromolecule, comprising a core and at least one branch emanating from the core, characterized in that the process comprises the steps a) through c):a) substantially every functional group of the core molecule is reacted with monomeric halogen cyanide unitsb) substantially every incorporated cyanide group is reduced to an aminec) substantially every amine group is reacted with monomeric halogen cyanide units,steps b) and c) being conducted alternately.
    Type: Grant
    Filed: July 26, 1996
    Date of Patent: December 16, 1997
    Assignee: DSM N.V.
    Inventors: Christiaan J. C. Stoelwinder, Ellen M. M. de Brabander-van den Berg, Atze J. Nijenhuis
  • Patent number: 5610268
    Abstract: The invention relates to a dendritic macromolecule comprising a core and branches emanating from the core wherein the branches are based on vinyl cyanide and/or fumaryl dinatrile units. The invention also relates to processes for preparing these dendritic macromolecules. The dendritic macromolecules according to the invention are not sensitive to degradation through hydrolysis reactions and are also very stable at a high temperature. The processes are very suitable for large scale production of the dendritic macromolecules without requiring purification of reaction intermediates.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: March 11, 1997
    Assignee: DSM N.V.
    Inventors: Egbert W. Meijer, Hubertus J. M. Bosman, Franciscus H. A. M. J. Vandenbooren, Ellen M. M. De Brabander-Van Den Berg, Anna M. C. F. Castelijns, Hendrikus C. J. De Man, Rafael W. E. G. Reintjens, Christiaan J. C. Stoelwinder, Atze J. Nijenhuis
  • Patent number: 5530092
    Abstract: The invention relates to a dendritic macromolecule comprising a core and branches emanating from the core wherein the branches are based on vinyl cyanide and/or fumaryl dinatrile units. The invention also relates to processes for preparing these dendritic macromolecules. The dendritic macromolecules according to the invention are not sensitive to degradation through hydrolysis reactions and are also very stable at a high temperature. The processes are very suitable for large scale production of the dendritic macromolecules without requiring purification of reaction intermediates.
    Type: Grant
    Filed: March 10, 1994
    Date of Patent: June 25, 1996
    Assignee: DSM N.V.
    Inventors: Egbert W. Meijer, Hubertus J. M. Bosman, Franciscus H. A. M. J. Vandenbooren, Ellen M. M. De Brabander-van den Berg, Anna M. C. F. Castelijns, Hendrikus C. J. De Man, Rafael W. E. G. Reintjens, Christiaan J. C. Stoelwinder, Atze J. Nijenhuis