Liquid toners containing charge directors and components for stabilizing their electrical properties
AssigneeSpectrum Sciences B.V.
InventorYaacov Almog
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Abstract
The invention relates to a homogeneous liquid composition which comprises: (1) liquid hydrocarbon compatible with liquid toners for electrostatic imaging, (2) at least one charge director, 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 piperidinemethanol and polyoxyalkylene ethers of formula R(O--A).sub.n OH, wherein R is alkyl or alkenyl containing 10-20 carbon atoms, A is C.sub.2-3 -alkylene and n is 2-24; and to liquid toners characterized by the presence of at least one charge director and at least one stabilizing component therefor as defined in (3), above.
Claims27
A homogeneous liquid composition which comprises:
- (1) liquid hydrocarbon compatible with liquid toners for electrostatic imaging;
- (2) at least one negative charging charge director;
- 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 polyoxyalkylene ethers of formula R(O--A).sub.n OH, wherein R is alkyl or alkenyl containing 10-20 carbon atoms, A is C.sub.2-3 -alkylene and n is 2-24.
A liquid toner for electrostatic imaging, which comprises non-polar carrier liquid, colorant particles, at least one negative charging charge director and at least one stabilizing component in an amount effective to stabilize the electrical properties of said at least one charge director, said component being polyoxyalkylene ethers of formula R(O--A).sub.n OH, where R is alkyl or alkenyl containing 10-20 carbon atoms, A is C.sub.2-3 -alkylene and n is 2-24.
A liquid toner for electrostatic imaging which comprises colored thermoplastic resin particles dispersed in an insulating non polar carrier liquid having a volume resistivity above 10.sup.9 ohm-cm and a dielectric constant below 3.0;
- at least one negative charging charge director;
- and at least one stabilizing component in an amount effective to stabilize the electrical properties of said at least one charge director, said component being polyoxyalkylene ethers of formula R(O--A).sub.n OH, wherein R is alkyl or alkenyl containing 10-20 carbon atoms, A is C.sub.2-3 -alkylene and n is 2-24.
An electrostatic imaging process which comprises the steps of:
- forming a charged latent electrostatic image on a photoconductive surface;
- applying to said surface oppositely charged colorant particles from a toner composition which comprises colorant particles, at least one negative charging charge director and at least at least one stabilizing component in an amount effective to stabilize the electrical properties of said at least one charge director, said component being polyoxyalkylene ethers of formula R(O--A).sub.n OH, wherein R is alkyl or alkenyl containing 10-20 carbon atoms, A is C.sub.2-3 -alkylene and n is 2-24;
- and
- transferring the resulting toner image to a substrate.
Dependencies are inferred from the claim text.