Toner processes
First Claim
1. A process for the preparation of toner comprising(i) preparing, or providing an aqueous colorant dispersion, which dispersion is comprised of a colorant and an ionic surfactant in water;
- (ii) blending said colorant dispersion with a latex emulsion comprised of resin particles, a nonionic surfactant, and an ionic surfactant of opposite charge polarity to that of the ionic surfactant in said colorant dispersion;
(iii) heating the resulting mixture below about the glass transition temperature (Tg) of the latex resin to form toner sized aggregates;
(iv) heating the resulting aggregate suspension of (iii) above about the Tg of the latex resin; and
(v) retaining the temperature in the range of from about 30°
C. to about 95°
C., and subsequently, adding an aqueous solution of boric acid, or an aqueous solution of a metal salt;
adjusting the pH of the resulting reaction mixture to from about 9 to about 12 by the addition of a base, followed by the addition of a salicylic acid or catechol; and
optionally(vi) isolating, washing and drying the toner obtained.
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Accused Products
Abstract
A process for the preparation of toner comprising
(i) preparing, or providing an aqueous colorant dispersion, which dispersion is comprised of a colorant and an ionic surfactant in water;
(ii) blending said colorant dispersion with a latex emulsion comprised of resin particles, a nonionic surfactant, and an ionic surfactant of opposite charge polarity to that of the ionic surfactant in said colorant dispersion;
(iii) heating the resulting mixture below about the glass transition temperature (Tg) of the latex resin to form toner sized aggregates;
(iv) heating the resulting aggregate suspension of (iii) above about the Tg of the latex resin; and
(v) retaining the temperature in the range of from about 30° C. to about 95° C., and subsequently, adding an aqueous solution of boric acid, or an aqueous solution of a metal salt; adjusting the pH of the resulting reaction mixture to from about 9 to about 12 by the addition of a base, followed by the addition of a salicylic acid or catechol; and optionally
(vi) isolating, washing and drying the toner obtained.
253 Citations
22 Claims
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1. A process for the preparation of toner comprising
(i) preparing, or providing an aqueous colorant dispersion, which dispersion is comprised of a colorant and an ionic surfactant in water; -
(ii) blending said colorant dispersion with a latex emulsion comprised of resin particles, a nonionic surfactant, and an ionic surfactant of opposite charge polarity to that of the ionic surfactant in said colorant dispersion; (iii) heating the resulting mixture below about the glass transition temperature (Tg) of the latex resin to form toner sized aggregates; (iv) heating the resulting aggregate suspension of (iii) above about the Tg of the latex resin; and (v) retaining the temperature in the range of from about 30°
C. to about 95°
C., and subsequently, adding an aqueous solution of boric acid, or an aqueous solution of a metal salt;
adjusting the pH of the resulting reaction mixture to from about 9 to about 12 by the addition of a base, followed by the addition of a salicylic acid or catechol; and
optionally(vi) isolating, washing and drying the toner obtained. - View Dependent Claims (4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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2. A process for the preparation of toner comprising blending a colorant dispersion and a latex emulsion, and wherein the colorant dispersion contains an ionic surfactant, the latex contains a nonionic surfactant and an ionic surfactant of opposite charge polarity to that of ionic surfactant in the colorant dispersion;
- heating the resulting mixture whereby aggregates form;
further heating said aggregate suspension;
followed by adjusting the pH of the reaction mixture to be from about 9 to about 12; and
then adding an aqueous solution of a metal salt, followed by the addition of a salicylic acid or a catechol; and
optionally isolating, washing and drying the toner. - View Dependent Claims (3, 7)
- heating the resulting mixture whereby aggregates form;
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20. A process comprising (i) mixing a colorant dispersion, which dispersion is comprised of a colorant and an ionic surfactant in water and a latex emulsion comprised of resin, a nonionic surfactant and an ionic surfactant of opposite charge polarity to that of the ionic surfactant in said colorant dispersion;
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(ii) heating the resulting mixture below about the glass transition temperature (Tg) of the latex resin; (iii) heating the resulting suspension of (ii) above about the Tg of the latex resin; and (iv) subsequently adding an aqueous solution of boric acid or a metal salt;
adding a base, followed by the addition of a salicylic acid or catechol; and
optionally(vi) isolating, washing and drying the toner obtained. - View Dependent Claims (21, 22)
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Specification