Photocopy toner stability

In Conservation DistList Instance 10:45, Beth Doyle asked about
toner stability. Best book on toner formulations, etc is

    An Introduction to Dry Toner Technology
    John F Cooper
    Toner Research Services, Sharonville, OH 45241
    513-733-4407
    Fax: 513-733-4744

Two elements are important, the pigment and the resin carrier. The
pigment is normally about 10 % carbon black which is pretty much
stable, the resins are based on a wide range of polymers including,
acrylics, epoxies, polyamides, polyesters, polystyrene, polyethylene.
Most of today's are based on styrene-acrylic copolymers, with most
toner manufacturers (frequently the copier manufacturer) having
their own secret formulations. It is therefore very difficult to
predict stability when you cannot get the formulation from a
manufacturer and when each supplier has several different
formulations.

Colin Williamson

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                  Conservation DistList Instance 10:48
                 Distributed: Monday, November 18, 1996
                       Message Id: cdl-10-48-009
                                  ***