Patents by Inventor Jean Castelein

Jean Castelein 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).

  • Thermoplastic rubber consisting of a mixture of polypropylene, high-impact polystyrene and a styrene/diene block copolymer
    Patent number: 4556691
    Abstract: Synthetic thermoplastic rubber consisting of a mixture containing from 10% to 45% by weight of polypropylene, from 10% to 45% by weight of high-impact polystyrene and from 30% to 80% by weight of elastomeric copolymer of the linear type, of styrene/diene blocks whose diene is either butadiene or isoprene, having at least three polymeric sequences and a content in styrene lower than 50% by weight.
    Type: Grant
    Filed: February 14, 1984
    Date of Patent: December 3, 1985
    Assignee: Montefina S.A.
    Inventor: Jean Castelein
  • Polymeric material consisting of a mixture of high-impact polystyrene, high-density polyethylene and a styrene/diene block copolymer
    Patent number: 4548988
    Abstract: Thermoplastic material of high impact resistance, consisting of a homogeneous mixture of high-density polyethylene, high-impact polystyrene and of a styrene/diene block copolymer having a content in styrene below 50% by weight.
    Type: Grant
    Filed: August 31, 1983
    Date of Patent: October 22, 1985
    Assignee: Montefina S.A.
    Inventor: Jean Castelein
  • Polymer compositions
    Patent number: 4525533
    Abstract: A polymer composition is disclosed which comprises polystyrene, polypropylene and a sequenced copolymer of conjugated diene and vinylaromatic compound such as styrene which has a radial structure. The polymer composition has improved migration properties.
    Type: Grant
    Filed: March 27, 1984
    Date of Patent: June 25, 1985
    Assignee: Montefina, S.A.
    Inventors: Jean-Noel Bertrand, Jean Castelein
  • Co-extruded laminate consisting of at least one sheet of polypropylene and at least one sheet of polymeric material based on high-impact polystyrene
    Patent number: 4464439
    Abstract: Thermoplastic laminate suited for thermo-forming, consisting of at least one sheet of crystalline polypropylene and of at least one sheet of polymeric material consisting of a mixture of high-impact polystyrene (from 1% to 75% by weight), crystalline polypropylene (from 20% to 85% by weight) and of styrene/dienic monomer block copolymer with three or more sequences (from 5% to 15% by weight).
    Type: Grant
    Filed: March 10, 1982
    Date of Patent: August 7, 1984
    Assignee: Montefina S.A.
    Inventor: Jean Castelein