Patents Assigned to Montefina S.A.
  • Expanded polypropylene and articles thereof
    Patent number: 4650816
    Abstract: Disclosed are rigid materials such as sheets, boards or tubes made of expanded polypropylene, which have a uniform specific gravity d of from about 4.1.times.10.sup.-6 to about 8.1.times.10.sup.-6 Newton/mm.sup.3, a crystallization temperature of from about 115.degree. C. to about 135.degree. C. and a flexural modulus Mf expressed in Newton/mm.sup.3 such that the ratio Mf:d is from about 1.5.times.10.sup.8 to about 1.7.times.10.sup.8 mm.
    Type: Grant
    Filed: September 30, 1985
    Date of Patent: March 17, 1987
    Assignee: Montefina, S.A.
    Inventor: Jean-Noel M. Bertrand
  • Expanded polypropylene films
    Patent number: 4638015
    Abstract: Disclosed are films made of expanded polypropylene, which have a uniform specific gravity d of from about 4.25.times.10.sup.-6 to about 6.50.times.10.sup.-6 Newton/mm.sup.3, a crystallization temperature of from about 115.degree. C. to about 135.degree. C. and an elastic modulus Me expressed in Newton/mm.sup.3 such that the ratio Me:d is from about 1.6.times.10.sup.8 to about 2.0.times.10.sup.8 mm.
    Type: Grant
    Filed: September 30, 1985
    Date of Patent: January 20, 1987
    Assignee: Montefina, S.A.
    Inventor: Jean-Noel M. Bertrand
  • 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