Toner particles of controlled shape and method of preparation
First Claim
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1. A method for the preparation of electrostatographic toner comprising the steps of:
- a) dissolving in ethyl acetate a hyperdispersant selected from SOLSPERSE®
24000 and SOLSPERSE®
20000, thereby forming a solution;
b) mixing the solution with a polymer material to form an organic phase;
c) dispersing the organic phase in an aqueous phase comprising a particulate stabilizer and homogenizing the resultant dispersion;
d) evaporating the solvent; and
e) washing and drying the resultant product.
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Abstract
A method is described for the preparation of electrophotographic toner particles which includes the use of SOLSPERSE®. The method involves dissolving in ethyl acetate a hyperdispersant selected from SOLSPERSE® 24000 and SOLSPERSE® 20000, thereby forming a solution; mixing the solution with a polymer material to form an organic phase; dispersing the organic phase in an aqueous phase containing a particulate stabilizer and homogenizing the resultant dispersion; evaporating the solvent; and washing and drying the resultant product.
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Citations
24 Claims
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1. A method for the preparation of electrostatographic toner comprising the steps of:
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a) dissolving in ethyl acetate a hyperdispersant selected from SOLSPERSE®
24000 and SOLSPERSE®
20000, thereby forming a solution;b) mixing the solution with a polymer material to form an organic phase; c) dispersing the organic phase in an aqueous phase comprising a particulate stabilizer and homogenizing the resultant dispersion; d) evaporating the solvent; and e) washing and drying the resultant product. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. In a method for preparing electrostatographic toner by dispersing an organic phase in an aqueous phase to yield a layer of particulate stabilizer on the surface of a polymer, the improvement which comprises adding SOLSPERSE®
- in a solvent to a polymer material, a pigment and optionally a charge control agent to form an organic phase for dispersing in the aqueous phase.
- View Dependent Claims (21, 22, 23, 24)
Specification