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 user 2007-06-21 at 2:04:00 pm Views: 66
  • #18046

    Chemicals Supplier Tailored Toner Pigments
    European chemicals supplier, LANXESS, comments on the demand and production of magnetite pigments for printer and copier toners.
    this year’s congress held concurrent with the Remax trade show in
    Dusseldorf, Dr. Hendrik Kathrein of LANXESS gave a presentation on the
    production of magnetite pigments for printer and copier toners. In his
    speech, the pigments expert from the Inorganic Pigments business unit
    emphasized that the demands on synthetic iron oxides are becoming
    increasingly more stringent. LANXESS is keeping pace: The company has
    the expertise for tailored solutions and products characterized by the
    highest levels of quality and environmental compatibility. As one of
    the world’s largest manufacturers of iron oxide pigments, LANXESS is
    also a leading supplier of toner oxides.

    Printer toner is more
    than just magnetic iron oxide. In most copiers and laser printers,
    magnetite pigments are used to blacken the appropriate parts of the
    page. Each magnetic one-component toner contains 30 to 60 percent of
    the specialty iron oxides. But modern devices have strict requirements
    for the particles. Each particle should be identical to all the others
    to ensure an optimal printed image. The particles have to exhibit the
    proper magnetic and electrical properties, and these properties must
    not be affected by humidity. Finally, the color has to be right: Deep
    black with an elegant blue undertone is preferred today. To satisfy all
    of these requirements, the iron oxide must crystallize under precisely
    controlled conditions.Modern laser printers, for example, require the
    smallest possible pigments with high tinting strength and low residual
    magnetism (remanence). There are no conventional magnetite crystals
    meeting these specifications. Magnetite normally crystallizes in a
    cubic or an octahedral (8-faced) structure. Both forms have excessive
    remanence and cannot be used in laser printers – unless larger
    particles are used. The tinting strength of these coarse crystals is
    too low, however. It took an ingenious formulation to produce spherical
    crystals, the only ones that exhibit all of the desired properties.
    LANXESS produces these specialty pigments with tailored chemical and
    physical properties.

    Another specialty are pigments with a
    silicone “rain coat” for particularly high-performance printers. As
    long as no one pours coffee into the copier, the “H-grades” absorb
    almost no water. The products have significant advantages for the
    manufacture of moisture-sensitive polyester-based toners. Adsorbed
    water influences the conductivity of the iron oxides and thus the
    electrostatic charge, which in turn can degrade print quality. The
    H-grades ensure that moisture in the air does not result in washed out
    colors.Because LANXESS works only with select iron raw materials, the
    entire product line is nearly free of dangerous heavy metals such as
    lead, cadmium, mercury or hexavalent chromium, and LANXESS pigments
    allow the production of toners which satisfy the criteria for
    eco-labels such as the “Blue Angel” (Germany) and “Eco Mark” (Japan).
    The heavy metal content of toners has been considered a possible
    workplace health hazard for some years now, making the
    environment-related labels an increasingly important marketing argument
    for the toner manufacturers.It is the perfect quality of the magnetic
    pigments that make perfect printouts possible. LANXESS produces
    tailored magnetites for a variety of applications.