Patents Assigned to I.B.F.
  • Composite polymers and their preparation which are useful in liquid chromatography
    Patent number: 5075371
    Abstract: A homogeneous composite polymer containing, in an interpenetrated form, 20% to 80% by weight of silica and 80% to 20% by weight of a three-dimensional crosslinked acrylic, vinyl and/or allyl copolymer comprising, in a copolymerized form, 98% to 70% by weight of at least one monofunctional acrylic, vinyl or allyl monomer and 2% to 30% by weight of a difunctional acrylic or allyl crosslinking monomer is useful in liquid chromatography.
    Type: Grant
    Filed: November 29, 1990
    Date of Patent: December 24, 1991
    Assignee: I.B.F.
    Inventors: Egisto Boschetti, Pierre Girot
  • Composite polymers, their preparation and their use in liquid chromatography
    Patent number: 5053135
    Abstract: A homogeneous composite polymer containing, in an interpenetrated form, 20% to 80% by weight of silica and 80% to 20% by weight of a three-dimensional crosslinked acrylic, vinyl and/or allyl copolymer comprising, in a copolymerized form, 98% to 70% by weight of at least one monofunctional acrylic, vinyl or allyl monomer and 2 % to 30% by weight of a difunctional acrylic or allyl crosslinking monomer is useful in liquid chromatography.
    Type: Grant
    Filed: May 11, 1990
    Date of Patent: October 1, 1991
    Assignee: I.B.F.
    Inventors: Egisto Boschetti, Pierre Girot