Patents by Inventor Berend Jan Dijk

Berend Jan Dijk 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).

  • Anionic cellulose ethers having temperature-dependent associative properties
    Patent number: 6669863
    Abstract: An anionic cellulose ether obtainable by a process comprising reacting an alkali metal cellulose with one or more reagents A selected from the group consisting of haloacetic acids, alkali metal haloacetates, alkali metal vinyl sulfonates, vinyl sulfonic acid, and precursors thereof, and one or more reagents B having the formula R1—(OCH2CH(R2))n-P, wherein R2 represents hydrogen or a methyl group; n is 0-2; P represents a glycidyl ether group, a 1,2-epoxy group or a precursor thereof, if P represents a glycidyl ether group, R1 represents a linear C3-C5 alkyl group, optionally containing an oxygen atom, a phenyl group, or a benzyl group, and if P represents a 1,2-epoxy group, R1 represents a linear C3-C5 alkyl group, optionally containing an oxygen atom. Preferably, reagent A is chloroacetic acid and reagent B is n-butyl glycidyl ether. The invention also relates to the use of said anionic cellulose ether as an associative thickener, rheology modifier or stabilizer.
    Type: Grant
    Filed: August 31, 2001
    Date of Patent: December 30, 2003
    Assignee: Akzo Nobel N.V.
    Inventors: Berend Jan Dijk, Jan Gerardus Batelaan
  • Hydrophobically modified anionic cellulose ethers
    Patent number: 6627751
    Abstract: A hydrophobically modified anionic cellulose ether obtainable by a process comprising reacting an alkali metal cellulose with at least three alkylating reagents A, B, and C. Reagent A is selected from the group of haloacetic acids, alkali metal haloacetates, alkali metal vinyl sulfonates, and vinyl sulfonic acid. Reagent B has the formula R1—(OCH2CH(R2))n—P, wherein R1 represents a C2-C7 group, R2 is hydrogen or a methyl group, n is 0-2, and P represents a glycidyl ether group, a 3-halo-2-hydroxypropyl ether group, a 1,2-epoxy group, or a halide, and reagent C has the formula R3—(OCH2CH(R2))m—P, wherein R3 represents a C8-C30 group, m is 0-10, and R2 and P have the meaning as described above.
    Type: Grant
    Filed: December 6, 1999
    Date of Patent: September 30, 2003
    Assignee: Akko Nobel N.V.
    Inventors: Jan Gerardus Batelaan, Berend Jan Dijk, Peter Marten Van Der Horst
  • Sulfur-vulcanized rubber compositions comprising substituted succinimide compounds
    Patent number: 5844049
    Abstract: Rubber compositions are provided having improved physical properties. More particularly, the present invention relates to sulfur-vulcanized rubber compositions which are vulcanized in the presence of certain bis-succinimide coagents, which possess anti-reversion and/or accelerating properties. The invention also relates to a sulfur-vulcanization process which is carried out in the presence of one or more bis-succinimide coagents, and to the use of bis-succinimide coagents in the sulfur-vulcanization of rubber. Finally, the invention relates to rubber products comprising rubber vulcanized with sulfur in the presence of one or more bis-succinimide coagents.
    Type: Grant
    Filed: June 12, 1997
    Date of Patent: December 1, 1998
    Assignee: Akzo Nobel nv
    Inventors: Rabindra Nath Datta, Auke Gerardus Talma, Arie Jacob de Hoog, Andre Steenbergen, Berend Jan Dijk