Method of making fluorescent toner
First Claim
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1. A method of making a fluorescent toner for use in electrostatography comprising(I) preparing a solution which compries(A) organic solvent;
- (B) a fluoroescent dye soluble in said solvent; and
(c) an organic polymer soluble in said solvent;
(II) mixing said solution with a sufficient amount of a liquid which is a non-solvent for said polymer to precipitate particles of a pigment which comprises said dye in solid solution with said polymer, said mixing being in the presence of a dispersant soluble in said non-solvent in an amount sufficient to prevent said precipitating pigment particles from agglomerating to a particle size greater than 1 μ
m;
(III) melt compound a mixture which comprises polymeric organic binder and said pigment; and
(IV) comminuting said melt compounded mixture.
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Abstract
Disclosed is a method of making a fluorescent toner for use in electrostatography and a fluorescent toner and developer made by that method. A solution is prepared which comprises an organic solvent, a fluorescent dye, and an organic polymer. A pigment is precipitated by mixing the solution with a non-solvent for the polymer in the presence of a dispersant. The pigment is melt compounded with a polymeric organic binder and the melt compounded mixture is comminuted.
32 Citations
16 Claims
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1. A method of making a fluorescent toner for use in electrostatography comprising
(I) preparing a solution which compries (A) organic solvent; -
(B) a fluoroescent dye soluble in said solvent; and (c) an organic polymer soluble in said solvent; (II) mixing said solution with a sufficient amount of a liquid which is a non-solvent for said polymer to precipitate particles of a pigment which comprises said dye in solid solution with said polymer, said mixing being in the presence of a dispersant soluble in said non-solvent in an amount sufficient to prevent said precipitating pigment particles from agglomerating to a particle size greater than 1 μ
m;(III) melt compound a mixture which comprises polymeric organic binder and said pigment; and (IV) comminuting said melt compounded mixture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification