Developers containing magnetic particles and a sublimable dyestuff
AssigneeSublistatic Holding S.A.
InventorDieter Hendriks
Life of this patent
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Abstract
Developers containing a polymer and at least one sublimable or vaporizable dyestuff which, at atmospheric pressure, passes into the vapor state at between 100.degree. and 220.degree. C., and characterized in that they consist of particles containing a mixture of at least one polymer with a plasticizer or a wax, which release the vapors of said dyestuff if heated at the sublimation or vaporization temperature of said dyestuff, and process for their preparation.
Claims16
A developer in the form of a dry free-flowing powder containing magnetic particles embedded in a mixture of a polymer and between 2.5 and 25% of at least one sublimable or vaporisable dyestuff which, at atmospheric pressure, passes into the vapour state at between 100.degree. and 200.degree. C, and consisting of particles containing particles of magnetic material in a mixture of at least one polymer with a wax, which release the vapors of said dyestuff if heated at the sublimation or vaporisation temperature of said dyestuff.
A developer according to claim 14, characterised in that they contain at least one of the following dyestuffs:
- 3'-hydroxyquinophthalone or 1-amino-4-hydroxy-2-(-methoxy)-ethoxy-anthraquinone.
Dependencies are inferred from the claim text.