Toner processes
First Claim
1. A process for the preparation of toner comprising:
- (i) preparing a pigment dispersion, which dispersion is comprised of a pigment, and an ionic surfactant;
(ii) shearing said pigment dispersion with a latex or emulsion blend comprised of resin, a counterionic surfactant with a charge polarity of opposite sign to that of said ionic surfactant and a nonionic surfactant, and wherein said resin contains an acid functionality;
(iii) heating the above sheared blend below about the glass transition temperature (Tg) of the resin to form electrostatically bound toner size aggregates;
(iv) adding anionic surfactant to stabilize the aggregates obtained in (iii);
(v) coalescing said aggregates by heating said bound aggregates above about the Tg of the resin;
(vi) reacting said resin of (v) with acid functionality with a base to form an acrylic acid salt, and which salt is ion exchanged in water with a base or a salt, optionally in the presence of metal oxide particles, to control the toner triboelectrical charge, which toner is comprised of resin and pigment; and
(vii) optionally drying the toner obtained.
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Accused Products
Abstract
A process for the preparation of toner comprising:
(i) preparing a pigment dispersion, which dispersion is comprised of a pigment, and an ionic surfactant;
(ii) shearing said pigment dispersion with a latex or emulsion blend comprised of resin, a counterionic surfactant with a charge polarity of opposite sign to that of said ionic surfactant and a nonionic surfactant, and wherein said resin contains an acid functionality;
(iii) heating the above sheared blend below about the glass transition temperature (Tg) of the resin to form electrostatically bound toner size aggregates;
(iv) adding anionic surfactant to stabilize the aggregates obtained in (iii);
(v) coalescing said aggregates by heating said bound aggregates above about the Tg of the resin;
(vi) reacting said resin of (v) with acid functionality with a base to form an acrylic acid salt, and which salt is ion exchanged in water with a base or a salt, optionally in the presence of metal oxide particles, to control the toner triboelectrical charge, which toner is comprised of resin and pigment; and
(vii) optionally drying the toner obtained.
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Citations
34 Claims
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1. A process for the preparation of toner comprising:
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(i) preparing a pigment dispersion, which dispersion is comprised of a pigment, and an ionic surfactant; (ii) shearing said pigment dispersion with a latex or emulsion blend comprised of resin, a counterionic surfactant with a charge polarity of opposite sign to that of said ionic surfactant and a nonionic surfactant, and wherein said resin contains an acid functionality; (iii) heating the above sheared blend below about the glass transition temperature (Tg) of the resin to form electrostatically bound toner size aggregates; (iv) adding anionic surfactant to stabilize the aggregates obtained in (iii); (v) coalescing said aggregates by heating said bound aggregates above about the Tg of the resin; (vi) reacting said resin of (v) with acid functionality with a base to form an acrylic acid salt, and which salt is ion exchanged in water with a base or a salt, optionally in the presence of metal oxide particles, to control the toner triboelectrical charge, which toner is comprised of resin and pigment; and (vii) optionally drying the toner obtained. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A process for the preparation of toner comprising:
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(i) preparing, or providing a pigment dispersion, which dispersion is comprised of a pigment, and an ionic surfactant; (ii) shearing said pigment dispersion with a latex blend comprised of resin, a counterionic surfactant with a charge polarity of opposite sign to that of said ionic surfactant and a nonionic surfactant, and wherein said resin contains an acid functionality; (iii) heating the above sheared blend below about the glass transition temperature (Tg) of the resin to form aggregates; (iv) adding anionic surfactant; (v) heating said aggregates above about the Tg of the resin; (vi) reacting in the presence of a metal oxide said resin with acid functionality with a base to form an acrylic acid salt; and
optionally(vii) isolating and drying the toner. - View Dependent Claims (30)
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31. A process for the preparation of toner comprising shearing a pigment dispersion with a latex blend, and wherein the pigment dispersion is comprised of a pigment and an ionic surfactant, and wherein the latex blend is comprised of resin, a counterionic surfactant with a charge polarity of opposite sign to that of said ionic surfactant and a nonionic surfactant, and wherein said resin contains an acid functionality;
- heating the above sheared blend below about the glass transition temperature (Tg) of the resin to form aggregates;
adding anionic surfactant to stabilize the formed aggregates;
heating said aggregates above about the Tg of the resin to effect coalescence thereof;
reacting said resin with acid functionality with a base to form an acrylic acid salt; and
optionally isolating and drying the toner. - View Dependent Claims (32, 33, 34)
- heating the above sheared blend below about the glass transition temperature (Tg) of the resin to form aggregates;
Specification