Patents by Inventor Albert J. Heuvelsland

Albert J. Heuvelsland 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).

  • Polymers containing highly grafted rubbers
    Patent number: 5959033
    Abstract: The present invention is directed to rubber modified polymers which contain a non-block grafted rubber having a degree of grafting of at least 30 percent at the point of phase inversion and a specified amount of grafted vinyl aromatic polymer.
    Type: Grant
    Filed: December 18, 1997
    Date of Patent: September 28, 1999
    Assignee: The Dow Chemical Company
    Inventors: Mehmet Demirors, Duane B. Priddy, Nicolaas M. A. Hermans, Rudi H. E. Veraart, Albert J. Heuvelsland, Kevin D. Sikkema
  • Production of polyether polyols with reduced unsaturation
    Patent number: 5070125
    Abstract: Polyether polyols having an equivalent weight of from about 200 to about 5000 are prepared by the process of this invention. The process uses barium- or strontium-containing alkoxylation catalysts to provide products with reduced unsaturation in comparison to similar products produced with potassium hydroxide catalysis. The use of these catalysts also increases the capping efficiency with ethylene oxide to provide products with a higher primary hyroxyl content for the same weight percentage of ethylene oxide cap.
    Type: Grant
    Filed: January 8, 1991
    Date of Patent: December 3, 1991
    Assignee: The Dow Chemical Company
    Inventor: Albert J. Heuvelsland
  • Production of polyether polyols with reduced unsaturation
    Patent number: 5010187
    Abstract: Polyether polyols having an equivalent weight of from about 200 to about 5000 are prepared by the process of this invention. The process uses barium- or strontium-containing alkoxylation catalysts to provide products with reduced unsaturation in comparison to similar products produced with potassium hydroxide catalysis. The use of these catalysts also increases the capping efficiency with ethylene oxide to provide products with a higher primary hydroxyl content for the same weight percentage of ethylene oxide cap.
    Type: Grant
    Filed: November 18, 1988
    Date of Patent: April 23, 1991
    Assignee: Dow Chemical Company
    Inventor: Albert J. Heuvelsland
  • Method for producing 1,4-dioxane
    Patent number: 4764626
    Abstract: A 1,4-dioxane is produced by subjecting a one-phase liquid reaction mixture of at least one compound of the general formula:RO--(CH.sub.2 CH.sub.2 O).sub.n --R (I)where n is an integer from 1 to 6 and each R is individually a hydrogen atom or an alkyl group containing 1 to 5 carbon atoms and a dehydration catalyst to a subatmospheric pressure and an elevated temperature sufficient to prepare 1,4-dioxane, which is removed as an overhead product. The method substantially reduces foaming and formation of tars and increases productivity.
    Type: Grant
    Filed: April 12, 1985
    Date of Patent: August 16, 1988
    Assignee: The Dow Chemical Company
    Inventor: Albert J. Heuvelsland