Electrically stabilized liquid toners
First Claim
1. A homogeneous liquid composition, for use in the preparation of liquid toners containing at least one charge director and in which the electrical properties of the charge director(s) is/are stabilized, which composition comprises:
- (1) insulating non-polar carrier liquid compatible with liquid toners for electrostatic imaging;
(2) at least one charge director other than an amine salt; and
(3) at least one stabilizing component in an amount effective to stabilize the electrical properties of said at least one charge director, said component being selected from non-quaternary amine salts and being soluble in the carrier.
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Accused Products
Abstract
A homogeneous liquid composition, for use in the preparation of liquid toners containing at least one charge director and in which the electrical properties of the charge director(s) is/are stabilized, comprises: (1) insulating non-polar carrier liquid compatible with liquid toners for electrostatic imaging; (2) at least one charge director other than an amine salt; and (3) at least one stabilizing component in an amount effective to stabilize the electrical properties of said at least one charge director, said component being selected from non-quaternary amine salts and being soluble in the carrier, e.g. diethylammonium chloride and isopropylamine dodecylbenzenesulfonate. The invention further relates to liquid toners for electrostatic imaging comprise thermoplastic resin particles dispersed in an insulating non polar carrier liquid, preferably a hydrocarbon having a volume resistivity above 109 ohm-cm and a dielectric constant below 3.0, colorant particles micro-dispersed in said carrier liquid, at least one charge director, and at least one stabilizing component (3), as defined above; a method for producing the liquid toners; and an electrostatic imaging process utilizing the liquid toners.
68 Citations
20 Claims
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1. A homogeneous liquid composition, for use in the preparation of liquid toners containing at least one charge director and in which the electrical properties of the charge director(s) is/are stabilized, which composition comprises:
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(1) insulating non-polar carrier liquid compatible with liquid toners for electrostatic imaging; (2) at least one charge director other than an amine salt; and (3) at least one stabilizing component in an amount effective to stabilize the electrical properties of said at least one charge director, said component being selected from non-quaternary amine salts and being soluble in the carrier. - View Dependent Claims (2, 3, 4, 5)
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- 6. A homogeneous composition according to claim 1, preceding claims, wherein said at least one charge director is selected from lecithin, basic barium petronate and calcium petronate.
- 8. A liquid toner for electrostatic imaging which comprises insulating non-polar carrier liquid, colorant particles, at least one charge director other than an amine salt, and at least one stabilizing component in an amount effective to stabilize the electrical properties of said at least one charge director, said stabilizing component being selected from non-quaternary amine salts and being soluble in the carrier.
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15. A liquid toner for electrostatic imaging which comprises thermoplastic resin particles dispersed in an insulating non-polar carrier liquid having a volume resistivity above 109 ohm-cm and a dielectric constant below 3.0;
- colorant particles micro-dispersed in said carrier liquid;
at least one charge director other than an amine salt; and
at least one stabilizing component in an amount effective to stabilize the electrical properties of said at least one charge director, said stabilizing component being selected from non-quaternary salts of aliphatic amines with an acid selected from inorganic acids and alkyl-substituted aromatic sulfonic acids, and being soluble in the carrier. - View Dependent Claims (16, 17, 18, 19)
- colorant particles micro-dispersed in said carrier liquid;
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20. An electrostatic imaging process which comprises the steps of:
- forming a charged latent electrostatic image on a photoconductive surface;
applying to said surface charged colorant particles from a toner composition which comprises insulating non-polar carrier liquid, colorant particles, at least one charge director other than an amine salt and at least one stabilizing component in an amount effective to stabilize the electrical properties of said at least one charge director, said stabilizing component being selected from non-quaternary amine salts and being soluble in the carrier; and
transferring the resulting toner image to a substrate.
- forming a charged latent electrostatic image on a photoconductive surface;
Specification