Patents Assigned to Talc de Luzenac (Societe Anonyme)
  • Talc substances having specific surface properties and method of manufacture
    Patent number: 5401482
    Abstract: The invention relates to talc substances consisting of particles having a sheet structure. These substances are characterised in that each particle has internally the crystalline structure of talc which confers upon it certain specific properties of this mineral (softness, thermal stability) and has hydrophilic surface properties unlike the hydrophobic properties of mineral talc which give rise to useful reactivity. The substances according to the invention have a thermal and chemical stability range similar to that of talc. They can be manufactured by thermal or chemical means under conditions designed to avoid internal conversion of the talc and to effect the surface modifications consisting of replacing inert siloxane bridges by active hydrophilic groups.
    Type: Grant
    Filed: March 31, 1993
    Date of Patent: March 28, 1995
    Assignee: Talc de Luzenac (Societe Anonyme)
    Inventors: Clauss: Frederic, Richard Baeza, Yves Pietrasanta, Alain Rousseau
  • Talc substances having specific surface properties, methods of manufacture and applications
    Patent number: 5229094
    Abstract: The invention relates to talc substances consisting of particles having a sheet structure. These substances are characterised in that each particle has internally the crystalline structure of talc which confers upon it certain specific properties of this mineral (softness, thermal stability) and has hydrophilic surface properties unlike the hydrophobic properties of mineral talc which give rise to useful reactivity. The substances according to the invention have a thermal and chemical stability range similar to that of talc. They can be manufactured by thermal or chemical means under conditions designed to avoid internal conversion of the talc and to effect the surface modifications consisting of replacing inert siloxane bridges by active hydrophilic groups.
    Type: Grant
    Filed: February 24, 1992
    Date of Patent: July 20, 1993
    Assignee: Talc de Luzenac (Societe Anonyme)
    Inventors: Frederic Clauss, Richard Baeza, Yves Pietrasanta, Alain Rousseau