Patents by Inventor Aaldrik Roelf Postema

Aaldrik Roelf Postema 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: 6068790
    Abstract: A polyol formulation is disclosed, the formulation including: (a) 80 to 99 parts by weight (pbw) of a polymer polyol comprising a base polyol having a molecular weight in the range of from 2,500 to 6,500, an average nominal functionality (Fn) of at least 2.0, an ethylene oxide content of 50 to 80%, and a primary hydroxyl content of at least 40% and a polymer stably dispersed therein; and, up to a total of 100 pbw, (b) 1 to 20 pbw of a hydrophilic polyol having a molecular weight in the range of from 2,000 to 5,500, an ethylene oxide content of at least 40% by weight and a primary hydroxyl content of at least 50%. The formulation may further include a tin catalyst and optionally a crosslinking agent and is very useful for producing latex-like polyurethane foams. These foams may be suitably applied in cushions (in e.g. car seats and upholstered furniture) or mattresses.
    Type: Grant
    Filed: December 9, 1996
    Date of Patent: May 30, 2000
    Assignee: Shell Oil Company
    Inventors: Aaldrik Roelf Postema, Bernadette Elisabeth Schlenter, Jeremy Hallam Shears, Jean-Claude Noel Eliane Vandichel
  • Patent number: 5730896
    Abstract: A method the preparation of rigid foams by reacting an organic polyisocyanate with an isocyanate-reactive material in the presence of a blowing promoter characterised in that the isocyanate-reactive material comprises at least one isocyanate-reactive cyclic carbonate or isocyanate-reactive cyclic urea, the reaction being performed in the presence of an inert insoluble organic liquid which is present as the dispersed phase of an emulsion or a microemulsion, and in the presence of a metal salt catalyst.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: March 24, 1998
    Assignee: Imperial Chemical Industries PLC
    Inventors: Herbert Russell Gillis, Dirk Stanssens, Rik De Vos, Aaldrik Roelf Postema, David Randall
  • Patent number: 5703136
    Abstract: A method for the preparation of rigid foams by reacting an organic polyisocyanate with an isocyanate-reactive material in the presence of a blowing promoter characterized in that the isocyanate-reactive material comprises at least one isocyanate-reactive cyclic carbonate or isocyanate-reactive cyclic urea, the reaction being performed in the presence of an inert insoluble organic liquid which is present as the disperse phase of an emulsion or a microemulsion, and in the presence of a metal salt catalyst.
    Type: Grant
    Filed: March 19, 1993
    Date of Patent: December 30, 1997
    Assignee: Imperial Chemical Industries plc
    Inventors: Herbert Russell Gillis, Dirk Stanssens, Rik De Vos, Aaldrik Roelf Postema, David Randall