Patents by Inventor Duurt P. W. Alkema

Duurt P. W. Alkema 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).

  • Radiation curable resin composition
    Patent number: 6858657
    Abstract: The present invention provides a curable composition, comprising: a (meth)acrylate urethane compound derived from a polypropylene glycol or a propyleneoxide ethyleneoxide copolymer glycol having a molecular weight between 1,000 and 13,000 and an amount of unsaturation less than 0.01 meq/g. The liquid curable resin composition of the present invention has improved liquid stability and can produce cured products having superior mechanical characteristics by polymerization. The composition further comprises preferably a primary or secondary amine. The liquid curable resin composition can be used as a coating material for optical fibers, adhesives, and the like. The composition is particularly suitable as a coating material for optical fibers for which long-term stability is required.
    Type: Grant
    Filed: January 23, 2003
    Date of Patent: February 22, 2005
    Assignees: DSM IP Assets B.V., JSR Corporation
    Inventors: Zen Komiya, Adrianus G. M. Abel, Duurt P. W. Alkema, Masahito Mase, Takashi Ukachi
  • Radiation curable resin composition
    Publication number: 20040014835
    Abstract: The present invention provides a curable composition, comprising: a (meth)acrylate urethane compound derived from a polypropylene glycol or a propyleneoxide ethyleneoxide copolymer glycol having a molecular weight between 1,000 and 13,000 and an amount of unsaturation less than 0.01 meq/g. The liquid curable resin composition of the present invention has improved liquid stability and can produce cured products having superior mechanical characteristics by polymerization. The composition further comprises preferably a primary or secondary amine. The liquid curable resin composition can be used as a coating material for optical fibers, adhesives, and the like. The composition is particularly suitable as a coating material for optical fibers for which long-term stability is required.
    Type: Application
    Filed: January 23, 2003
    Publication date: January 22, 2004
    Applicant: DSM N.V.
    Inventors: Zen Komiya, Adrianus G.M. Abel, Duurt P.W. Alkema, Masahito Mase
  • Radiation curable resin composition
    Patent number: 6528553
    Abstract: The present invention provides a curable composition, comprising: a (meth)acrylate urethane compound derived from a polypropylene glycol or a propyleneoxide ethyleneoxide copolymer glycol having a molecular weight between 1,000 and 13,000 and an amount of unsaturation less than 0.01 meq/g. The liquid curable resin composition of the present invention has improved liquid stability and can produce cured products having superior mechanical characteristics by polymerization. The composition further comprises preferably a primary or secondary amine. The liquid curable resin composition can be used as a coating material for optical fibers, adhesives, and the like. The composition is particularly suitable as a coating material for optical fibers for which long-term stability is required.
    Type: Grant
    Filed: July 20, 2000
    Date of Patent: March 4, 2003
    Assignees: DSM N.V., JSR Corporation
    Inventors: Zen Komiya, Adrianus G. M. Abel, Duurt P. W. Alkema, Masahito Mase, Takashi Ukachi