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US 4,496,643 AGranted
Two-component dry electrostatic developer composition containing onium charge control agent
AssigneeEastman Kodak Company
InventorsJohn C. Wilson, Lawrence P. DeMejo, Thomas A. Jadwin, Stewart H. Merrill
Life of this patent
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Abstract
A two-component, dry electrostatic developer composition containing toner particles and coated-carrier particles is disclosed. The toner contains a binder polymer and a phosphonium, arsonium or stibonium charge-control agent dispersed in the toner binder. The carrier is coated with a fluoropolymer. The resulting developer exhibits reduced toner throw-off and other disclosed advantages.
Claims9
A dry, two-component electrostatic developer composition comprising:
- (a) toner particles comprising a polymeric binder,
- (b) an onium compound, as a charge-control agent, dispersed in the toner binder and having the formula:
- ##STR3## wherein:
- X is a phosphorous, arsenic or antimony atom;
- each of R.sub.2, R.sub.3 and R.sub.4, which are the same or different, represents alkyl having from 1 to about 20 carbon atoms;
- aralkyl or alkaryl in which the alkyl group has 1 to about 20 carbon atoms and the aryl group has from about 6 to about 14 carbon atoms;
- or aryl having from about 6 to about 14 carbon atoms;
- R.sub.1 represents a group as defined with respect to R.sub.2, R.sub.3 and R.sub.4 ;
- a hetero ring system when taken together with X and any one of R.sub.2, R.sub.3 and R.sub.4 ;
- or the group:
- ##STR4## wherein:
- R.sub.5 is alkylene having from about 1 to about 20 carbon atoms;
- oxydialkylene having from about 1 to about 20 carbon atoms in each alkylene group or dialkylenearylene having from about 1 to about 20 carbon atoms in each alkylene group and from about 6 to about 14 atoms in the arylene group;
- and
- Y.sup.- is an anion, and
- (c) carrier particles surface-coated with a fluoropolymer.
13 more elements
Dependencies are inferred from the claim text.