US5153090A — Charge directors for use in electrophotographic c…

Claim 1

Independent Claim 103 words

An electrophotographic liquid developer composition comprising, dispersed in an electrically insulating carrier liquid: (a.) toner comprising particles of a colored resinous phase; (b.) an antistain agent; and (c.) a charge director comprising a metal salt of the formula (X - ) a M +n (AA - ) b in which: M is a metal atom; AA - represents the anion of an ortho-hydroxy aromatic acid; X - represents the anion of an α,β-diketone; n is 2, 3 or 4; and a and b are integers the sum of which is equal to n, with the proviso that neither a nor b is 0.

Claim 2

Dependent Claim 103 words

An electrophotographic liquid developer composition comprising, dispersed in an electrically insulating carrier liquid: (a.) toner comprising particles of a colored resinous phase; (b.) an antistain agent; and (c.) a charge director comprising a metal salt of the formula (X - ) a M +n (AA - ) b in which: M is a metal atom; AA - represents the anion of an ortho-hydroxy aromatic acid; X - represents the anion of an α,β-diketone; n is 2, 3 or 4; and a and b are integers the sum of which is equal to n, with the proviso that neither a nor b is 0.

Claim 3

Dependent Claim 54 words

The developer composition of claim 1, wherein the charge director is of the formula (X - )M +3 (AA - ) 2 in which: M is aluminum; AA - represents diisopropyl salicylate; and X - represents the anion of an α,β-diketone having the formula ##STR4## wherein R 1 and R 2 are lower alkyl.

Claim 4

Dependent Claim 32 words

The developer composition of claim 2, wherein the charge director is of the formula (AcAc - )Al +3 (DIPS - ) 2 where AcAc represents acetyl acetonate and DIPS represents diisopropyl salicylate.

Claim 5

Dependent Claim 145 words

An electrophotographic liquid developer composition comprising, dispersed in an electrically insulating carrier liquid: (a.) toner comprising particles of a colored resinous phase, additionally containing an incompatible phase; (b.) an antistain agent selected from the group consisting of: (i) ethoxylated derivatives of fatty acids, alcohols and amides; (ii) alkyl phosphates and phosphonates and metal salts thereof; (iii) homopolymers of ethylene oxide; and (iv) copolymers of ethylene and propylene oxide; and (c.) a charge director comprising a metal salt of the formula (X - ) a M +n (AA - ) b in which: M is a metal atom; AA - represents the anion of an ortho-hydroxy aromatic acid; X - represents the anion of an α,β-diketone; n is 2, 3 or 4; and a and b are integers the sum of which is equal to n, with the proviso that neither a nor b is 0.

Claim 6

Dependent Claim 145 words

An electrophotographic liquid developer composition comprising, dispersed in an electrically insulating carrier liquid: (a.) toner comprising particles of a colored resinous phase, additionally containing an incompatible phase; (b.) an antistain agent selected from the group consisting of: (i) ethoxylated derivatives of fatty acids, alcohols and amides; (ii) alkyl phosphates and phosphonates and metal salts thereof; (iii) homopolymers of ethylene oxide; and (iv) copolymers of ethylene and propylene oxide; and (c.) a charge director comprising a metal salt of the formula (X - ) a M +n (AA - ) b in which: M is a metal atom; AA - represents the anion of an ortho-hydroxy aromatic acid; X - represents the anion of an α,β-diketone; n is 2, 3 or 4; and a and b are integers the sum of which is equal to n, with the proviso that neither a nor b is 0.

Claim 7

Dependent Claim 107 words

A process for making an electrophotographic liquid developer composition, which comprises dispersing, in an electrically insulating carrier liquid: a toner comprised of particles of a colored resinous phase; an antistain agent; and a charge director comprising a metal salt of the formula (X - ) a M +n (AA - ) b in which: M is a metal atom; AA - represents the anion of an ortho-hydroxy aromatic acid; X - represents the anion of an α,β-diketone; n is 2, 3 or 4; and a and b are integers the sum of which is equal to n, with the proviso that neither a nor b is 0.

Claim 8

Dependent Claim 107 words

A process for making an electrophotographic liquid developer composition, which comprises dispersing, in an electrically insulating carrier liquid: a toner comprised of particles of a colored resinous phase; an antistain agent; and a charge director comprising a metal salt of the formula (X - ) a M +n (AA - ) b in which: M is a metal atom; AA - represents the anion of an ortho-hydroxy aromatic acid; X - represents the anion of an α,β-diketone; n is 2, 3 or 4; and a and b are integers the sum of which is equal to n, with the proviso that neither a nor b is 0.

Claim 9

Dependent Claim 197 words

In a process for developing an electrostatic charge pattern using a consecutive color toning system, the process comprising (a) forming an initial electrostatic charge pattern on a substrate and developing the initial pattern with a first liquid developer composition comprising toner particles of a resinous phase containing a first colorant dispersed in an insulating carrier liquid, then (b) forming a second electrostatic charge pattern on the substrate and developing the second pattern with a second liquid developer composition comprising toner particles of a resinous phase containing a second colorant dispersed in an insulating carrier liquid, the improvement which comprises: conducting the developing steps in immediate succession without any additional processing steps therebetween; and including in said first and second liquid developer compositions a charge director comprising a metal salt of the formula (X - ) a M +n (AA - ) b in which: M is a metal atom; AA - represents the anion of an ortho-hydroxy aromatic acid; X - represents the anion of an α,β-diketone; n is 2, 3 or 4; and a and b are integers the sum of which is equal to n, with the proviso that neither a nor b is 0.

Claim 10

Dependent Claim 197 words

In a process for developing an electrostatic charge pattern using a consecutive color toning system, the process comprising (a) forming an initial electrostatic charge pattern on a substrate and developing the initial pattern with a first liquid developer composition comprising toner particles of a resinous phase containing a first colorant dispersed in an insulating carrier liquid, then (b) forming a second electrostatic charge pattern on the substrate and developing the second pattern with a second liquid developer composition comprising toner particles of a resinous phase containing a second colorant dispersed in an insulating carrier liquid, the improvement which comprises: conducting the developing steps in immediate succession without any additional processing steps therebetween; and including in said first and second liquid developer compositions a charge director comprising a metal salt of the formula (X - ) a M +n (AA - ) b in which: M is a metal atom; AA - represents the anion of an ortho-hydroxy aromatic acid; X - represents the anion of an α,β-diketone; n is 2, 3 or 4; and a and b are integers the sum of which is equal to n, with the proviso that neither a nor b is 0.

Claim 11

Dependent Claim 22 words

The process of claim 6, further comprising repeating steps (a) and (b) with third and fourth colorants to provide a developed image.

Claim 12

Dependent Claim 34 words

The process of claim 7, further including (d) transferring the developed image provided in step (c) to a surface of a selected substrate so as to give rise to an electrophotographic color print thereon.

Claim 13

Dependent Claim 53 words

The process of claim 7, wherein the charge director is of the formula (X - )M +3 (AA - ) 2 in which: M is aluminum; AA - represents diisopropyl salicylate; and X - represents the anion of an α,β-diketone having the formula ##STR5## wherein R 1 and R 2 are lower alkyl.

Claim 14

Dependent Claim 53 words

The process of claim 6, wherein the charge director is of the formula (X - )M +3 (AA - ) 2 in which: M is aluminum; AA - represents diisopropyl salicylate; and X - represents the anion of an α,β-diketone having the formula ##STR6## wherein R 1 and R 2 are lower alkyl.

Claim 15

Dependent Claim 103 words

An electrophotographic image constituting a composite color print, comprising, deposited on a substrate in a predetermined pattern: toner comprised of a colored resinous phase; an antistain agent; and a charge director comprising a metal salt of the formula (X - ) a M +n (AA - ) b in which M is a metal atom, AA - represents the anion of an ortho-hydroxy aromatic acid, X - represents the anion of an α,β-diketone, n is 2, 3 or 4, and a and b are integers the sum of which is equal to n, with the proviso that neither a nor b is 0.

Claim 16

Dependent Claim 103 words

An electrophotographic image constituting a composite color print, comprising, deposited on a substrate in a predetermined pattern: toner comprised of a colored resinous phase; an antistain agent; and a charge director comprising a metal salt of the formula (X - ) a M +n (AA - ) b in which M is a metal atom, AA - represents the anion of an ortho-hydroxy aromatic acid, X - represents the anion of an α,β-diketone, n is 2, 3 or 4, and a and b are integers the sum of which is equal to n, with the proviso that neither a nor b is 0.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1995-10-06	1996-04-06	1996-10-06	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1999-10-06	2000-04-06	2000-10-06	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2003-10-06	2004-04-06	2004-10-06	$7700.00	Window Closed / Lapsed

Charge directors for use in electrophotographic compositions and processes

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