Patents by Inventor Eize Roerdink

Eize Roerdink 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).

  • Terpolyamide from tetramethylene diamine
    Patent number: 5084552
    Abstract: The invention relates to a polyamide composition comprising tetramethylene adipamide, tetramethylene-terephthalamide and tetramethylene isophthalamide units. the polyamide composition has a melting temperature in the same order as the homopolymer tetramethylene adipamide, a comparable crystallinity but very improved melt stability and stiffness.
    Type: Grant
    Filed: August 1, 1990
    Date of Patent: January 28, 1992
    Assignee: Stamicarbon B.V.
    Inventors: Eize Roerdink, Jean M. M. Warnier
  • 4.6/4.I copolyamide and a process for the preparation thereof
    Patent number: 4849498
    Abstract: The invention relates to a copolyamide for application in films with improved barrier properties. The copolyamide containing tetramethyleneadipamide and tetramethylene-isophtalamide in a ratio between 9:1 and 1:9 and a relative viscosity of at least 2.0, and a process for the production of the copolyamide. Preferably the copolyamide contains a small amount of a compound that induces the formation of networks between the polyamide chains.
    Type: Grant
    Filed: October 22, 1987
    Date of Patent: July 18, 1989
    Assignee: Stamicarbon B.V.
    Inventors: Eize Roerdink, Jean M. M. Warnier
  • High molecular weight polytetramethyleneadipamide pellets
    Patent number: 4814356
    Abstract: The invention relates to polyamide pellets for use in the production of high molecular weight polytetramethyleneadipamide articles. The polyamide pellets have sizes of between 1 mm and 20 mm and porosity of between 0.1 and 20 vol %. Prepolymer polyamide pellets have a crushing strength of at least 0.5, and after-condensed pellets have crushing strength of at least 15 kg.
    Type: Grant
    Filed: April 5, 1988
    Date of Patent: March 21, 1989
    Inventors: Antonius J. P. Bongers, Eize Roerdink
  • Production of high-molecular polytetramethylene adipamide pellet
    Patent number: 4757131
    Abstract: The invention relates to a method for the production of high-molecular polytetramethylene adipamide in a two-step process in which the prepolymer particles obtained in the first process step are compressed into pellets which are subjected to the after-condensation reaction. The obtained high-molecular polytetramethylene adipamide pellets can be used without further shaping through e.g. melt extrusion.
    Type: Grant
    Filed: November 26, 1986
    Date of Patent: July 12, 1988
    Assignee: Stamicarbon B.V.
    Inventors: Antonius J. P. Bongers, Eize Roerdink
  • Process for the preparation of nylon 4,6
    Patent number: 4722997
    Abstract: A reproducible method for the preparation of high molecular weight white poly(tetramethyleneadipamide) nylon 4,6 using moderate temperatures and relatively short reaction times is disclosed. In the method, the prepolymerization step is limited under controlled reaction conditions so that a prepolymer is formed with a very low degree of polymerization, whereby a shorter, commercially viable, after-condensation time is achieved to obtain a high molecular weight final poly-condensation polymer product.
    Type: Grant
    Filed: July 25, 1986
    Date of Patent: February 2, 1988
    Assignee: Stamicarbon, B.V.
    Inventors: Eize Roerdink, Jean M. M. Warnier
  • Thermoplastic moulding compound
    Patent number: 4661545
    Abstract: The invention relates to a thermoplastic moulding compound consisting of:A. at least 95% (wt) of a copolymer consisting of1. 50-95 moles % styrene and/or .alpha.-methylstyrene2. 50-55 moles % unsaturated dicarboxylic anhydrideB. at most 5% (wt) of an phosphite with the general formula of ##STR1## where R represents hydrogen or the residue of an alkyl, cycloalkyl, aryl, alkaryl or aralkyl, while the R substituents need not to be the same and may contain heteroatoms.It has been found that additions of these phosphites to SMA-containing moulding compounds checks the decomposition of SMA, prevents the moulding compound from getting stuck to the processing equipment and consequently reduces corrosion to a high degree.
    Type: Grant
    Filed: October 31, 1985
    Date of Patent: April 28, 1987
    Assignee: Stamicarbon B.V. (Licensing subsidiary of DSM)
    Inventors: Wilhelmus G. M. Bruls, Eize Roerdink