New electrostatographic toners and developers containing new charge-control agents

DETAILED DESCRIPTION What is claimed is: 1.
A dry, particulate, electrostatographic toner composition comprising a polymeric binder and a charge-control agent comprising a quaternary ammonium salt having the structure ##STR3## wherein R is alkyl having 12 to 18 carbon atoms.
2.
The toner composition of claim 1, wherein R is CH.
sub.
3 (CH.
sub.
2).
sub.
17.
3.
An electrostatographic developer comprising: a.
the particulate toner composition of claim 1 and b.
carrier particles.
4.
The developer of claim 3, wherein the carrier particles comprise core material coated with a fluorohydrocarbon polymer.




Description:
FIELD OF THE INVENTION This invention relates to certain new electrostatographic toners and developers containing new quaternary ammonium salts as charge-control agents.
More particularly, the new salts are thermally stable compounds that can be well-dispersed in typical tone binder materials to form the inventive toners having good charging properties without unacceptable interactions with other developer or copier components.
BACKGROUND In electrostatography an image comprising an electrostatic field pattern, usually of non-uniform strength, (also referred to as an electrostatic latent image) is formed on an insulative surface of an electrostatographic element by any of various methods.
For example, the electrostatic latent image may be formed electrophotographically (i.
e.
, by imagewise photo-induced dissipation of the strength of portions of an electrostatic field of uniform strength previously formed on a surface of an electrophotographic element comprising a photoconductive layer and an electrically conductive substrate), or it may be formed by dielectric recording (i.
e.
, by direct electrical formation of an electrostatic field pattern on a surface of a dielectric material).
Typically, the electrostatic latent image is then developed into a toner image by contacting the latent image with an electrostatographic developer.
If desired, the latent image can be transferred to another surface before development