US5254424A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High solids replenishable liquid developer containing urethane-modified polyester toner resin
Assignee: Xerox Corp
•
Filing: 1991-12-23
•
Granted: 1993-10-19
•
Expires: 2011-12-23
Abstract
Abstract A high solids replenishable electrostatic liquid developer concentrate contains toner particles formed from a urethane modified polyester. This composition can be concentrated up to toner solids and subsequently sonicated to a working strength dilution.
Inventors
- 👤 Thomas Felder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:51
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/13; G03G9/132
Claims Analysis
Total Claims: 51
Claim 1
Independent Claim
67 words
A method for producing a readily redispersible high solids replenishable electrostatic liquid developer concentrate having a solids content of more than about 50%, comprising: blending particles containing a urethane modified polyester resin and a colorant with a liquid toner dispersant to form a toner dispersant mixture, wherein the particles have an average particle size of less than 30 microns as measured by a centrifugal particle size analyzer.
Claim 2
Independent Claim
67 words
A method for producing a readily redispersible high solids replenishable electrostatic liquid developer concentrate having a solids content of more than about 50%, comprising: blending particles containing a urethane modified polyester resin and a colorant with a liquid toner dispersant to form a toner dispersant mixture, wherein the particles have an average particle size of less than 30 microns as measured by a centrifugal particle size analyzer.
Claim 3
Independent Claim
25 words
The method according to claim i, wherein said urethane modified polyester resin has a glass transition temperature of about 40° C. to about 80° C.
Claim 4
Dependent Claim
22 words
The method according to claim 1, wherein said urethane-modified polyester resin is a reaction product of a polyester and an isocyanate compound.
Claim 5
Dependent Claim
21 words
The method according to claim 3, wherein said polyester has a number average molecular weight of about 1,000 to about 15,000.
Claim 6
Dependent Claim
50 words
The method according to claim 3, wherein said polyester is obtained by polycondensation of a polycarboxylic acid and a polyhydric alcohol such that a ratio of hydroxyl groups of the polyhydric alcohol to carboxyl groups of the polycarboxylic acid is in the range of from about .8 to about 1.4.
Claim 7
Dependent Claim
37 words
The method according to claim 3, wherein a ratio of the isocyanate compound to hydroxyl groups of the polyester resin is in the range of about 0.05 to about 0.95 mole-equivalent per mole of the hydroxyl groups.
Claim 8
Dependent Claim
34 words
The method according to claim 3, wherein said isocyanate compound is selected from the group consisting of hexamethylene diisocyanate, isophorone diisocyanate, tolylene diisocyanate, diphenylmethane diisocyanate, xylylene diisocyanate, tetramethylxylylene diisocyanate, and tri-functional to hexafunctional polyisocyanates.
Claim 9
Independent Claim
28 words
The method according to claim further comprising reducing the size of s id particles in said toner dispersant mixture to form a reduced particle size toner dispersant mixture.
Claim 10
Dependent Claim
22 words
The method according to claim 1, wherein the size of said particles is reduced to between about .5 and about 10 microns.
Claim 11
Dependent Claim
19 words
The method according to claim 1, wherein the toner dispersant mixture is centrifuged to form a centrifuged dispersant mixture.
Claim 12
Dependent Claim
41 words
The method according to claim 1, wherein liquid toner dispersant of said toner dispersant mixture is replaced with a low boiling alkane to form an alkane mixture, and alkane is separated from said alkane mixture to produce a concentrated toner mass.
Claim 13
Dependent Claim
23 words
The method according to claim 1, wherein said solids content of the toner dispersant mixture is increased to more than about 90% solids.
Claim 14
Dependent Claim
58 words
A readily redispersible high solids replenishable electrostatic liquid developer concentrate having a solids content of more than about 50%, comprising toner particles containing a urethane modified polyester resin and a colorant, wherein the toner particles have an average particle size of less than 30 microns as measured by a centrifugal particle size analyzer; and a liquid toner dispersant.
Claim 15
Dependent Claim
58 words
A readily redispersible high solids replenishable electrostatic liquid developer concentrate having a solids content of more than about 50%, comprising toner particles containing a urethane modified polyester resin and a colorant, wherein the toner particles have an average particle size of less than 30 microns as measured by a centrifugal particle size analyzer; and a liquid toner dispersant.
Claim 16
Dependent Claim
25 words
The developer concentrate according to claim 13, wherein said urethane polyester resin has a glass transition temperature of about 40° C. to about 80° C.
Claim 17
Dependent Claim
24 words
The developer concentrate according to claim 13, wherein said urethane modified polyester resin is a reaction product of a polyester and an isocyanate compound.
Claim 18
Dependent Claim
22 words
The developer concentrate according to claim 15, wherein said polyester has a number average molecular weight of about 1,000 to about 15,000.
Claim 19
Dependent Claim
51 words
The developer concentrate according to claim 15, wherein said polyester is obtained by polycondensation of a polycarboxylic acid and a polyhydric alcohol such that a ratio of hydroxyl groups of the polyhydric alcohol to carboxyl groups of the polycarboxylic acid is in the range of from about .8 to about 1.4.
Claim 20
Dependent Claim
37 words
The developer concentrate according to claim 15, wherein a ratio of isocyanate compound to hydroxyl groups of the polyester resin is in the range of about 0.05 to about 0.95 mole-equivalent per mole of the hydroxyl groups.
Claim 21
Dependent Claim
35 words
The developer concentrate according to claim 15, wherein said isocyanate compound is selected from the group consisting of hexamethylene diisocyanate, isophorone diisocyanate, tolylene diisocyanate, diphenylmethane diisocyanate, xylylene diisocyanate, tetramethylxylylene diisocyanate, and tri-functional to hexafunctional polyisocyanates.
Claim 22
Dependent Claim
18 words
The developer concentrate according to claim 13, wherein a solids content of said concentrate is above about 90%.
Claim 23
Dependent Claim
25 words
The developer concentrate according to claim 13, wherein said toner particles have an average particle size of from about .5 micron to about 10 microns.
Claim 24
Dependent Claim
12 words
The developer concentrate according to claim 13, further comprising a charge director.
Claim 25
Dependent Claim
19 words
The developer concentrate according to claim 22, wherein said charge director is a metallic salt of an organic acid.
Claim 26
Dependent Claim
81 words
The developer concentrate according to claim 23, wherein said charge director is a metallic salt of a monoester or diester of an oxyacid selected from the group consisting of an oxyacid derived from phosphorus, an oxyacid derived from phosphorus and containing one or two organic groups linked to the phosphorus atom by a carbon atom, and an oxyacid derived from phosphorus and containing an ester group linked by a carbon atom to the phosphorus atom; a metal alkyl sulphonate; or lecithin.
Claim 27
Dependent Claim
19 words
The developer concentrate according to claim 13, wherein a fine particle size inorganic oxide is blended with said resin.
Claim 28
Dependent Claim
17 words
The developer concentrate according to claim 15, wherein the toner particles have dispersed therein a metallic soap.
Claim 29
Dependent Claim
21 words
An electrostatic liquid developer, comprising: toner particles containing a urethane modified polyester resin and a colorant; and a liquid toner dispersant.
Claim 30
Dependent Claim
21 words
An electrostatic liquid developer, comprising: toner particles containing a urethane modified polyester resin and a colorant; and a liquid toner dispersant.
Claim 31
Dependent Claim
25 words
The developer according to claim 27, wherein said urethane modified polyester resin has a glass transition temperature of about 40° C. to about 80° C.
Claim 32
Dependent Claim
21 words
The developer according to claim 27, wherein said polyester resin is a reaction product of a polyester and an isocyanate compound.
Claim 33
Dependent Claim
21 words
The developer according to claim 29, wherein said polyester has a number average molecular weight of about 1,000 to about 15,000.
Claim 34
Dependent Claim
50 words
The developer according to claim 29, wherein said polyester is obtained by polycondensation of a polycarboxylic acid and a polyhydric alcohol such that a ratio of hydroxyl groups of the polyhydric alcohol to carboxyl groups of the polycarboxylic acid is in the range of from about .8 to about 1.4.
Claim 35
Dependent Claim
36 words
The developer according to claim 29, wherein a ratio of isocyanate compound to hydroxyl groups of the polyester resin is in the range of about 0.05 to about 0.95 mole-equivalent per mole of the hydroxyl groups.
Claim 36
Dependent Claim
34 words
The developer according to claim 29, wherein said isocyanate compound is selected from the group consisting of hexamethylene diisocyanate, isophorone diisocyanate, tolylene diisocyanate, diphenylmethane diisocyanate, xylylene diisocyanate, tetramethylxylylene diisocyanate, and tri-functional to hexafunctional polyisocyanates.
Claim 37
Independent Claim
83 words
A method of replenishing toner solids in a liquid electrostatic developer in a liquid electrostatographic printing machine, comprising adding toner particles having an average particle size of less than 30 microns as measured by a centrifugal particle size analyzer and containing a urethane modified polyester resin and a colorant to a toner solids depleted liquid electrostatic developer in said machine, wherein said toner particles added to said electrostatic developer are in a readily redispersible composition having a solids content of greater than 50%.
Claim 38
Independent Claim
83 words
A method of replenishing toner solids in a liquid electrostatic developer in a liquid electrostatographic printing machine, comprising adding toner particles having an average particle size of less than 30 microns as measured by a centrifugal particle size analyzer and containing a urethane modified polyester resin and a colorant to a toner solids depleted liquid electrostatic developer in said machine, wherein said toner particles added to said electrostatic developer are in a readily redispersible composition having a solids content of greater than 50%.
Claim 39
Dependent Claim
21 words
The method according to claim 34, wherein said toner particles are added in a substantially dry state to said electrostatic developer.
Claim 40
Dependent Claim
27 words
The method according to claim 34, wherein said toner particles added to said electrostatic developer are in a liquid concentrate having a solids content greater than 90%.
Claim 41
Dependent Claim
23 words
The method according to claim 34, wherein said urethane modified polyester is a reaction product of a polyester resin and an isocyanate compound.
Claim 42
Dependent Claim
22 words
The method according to claim 37, wherein said polyester resin has a number average molecular weight of about 1,000 to about 15,000.
Claim 43
Dependent Claim
25 words
The method according to claim 34, wherein said urethane modified polyester resin has a glass transition temperature of about 40° C. to about 80° C.
Claim 44
Independent Claim
45 words
A method for producing a high solids replenishable electrostatic liquid developer concentrate, comprising: blending particles containing a urethane modified polyester resin and a colorant with a liquid toner dispersant to form a toner dispersant mixture, and increasing a solids content of said toner dispersant mixture.
Claim 45
Independent Claim
45 words
A method for producing a high solids replenishable electrostatic liquid developer concentrate, comprising: blending particles containing a urethane modified polyester resin and a colorant with a liquid toner dispersant to form a toner dispersant mixture, and increasing a solids content of said toner dispersant mixture.
Claim 46
Dependent Claim
21 words
The method according to claim 1 wherein the toner dispersant mixture has an average particle size of less than 30 microns.
Claim 47
Dependent Claim
52 words
The method according to claim 1 wherein the urethane modified polyester resin has a glass transition temperature of about 40° C. to about 80° C. and an average number molecular weight of about 1000 to about 15,000, and the toner dispersant mixture has an average particle size of less than 30 microns.
Claim 48
Dependent Claim
22 words
The developer concentrate according to claim 13, wherein the toner dispersant mixture has an average particle size of less than 30 microns.
Claim 49
Dependent Claim
53 words
The developer concentrate according to claim 13, wherein the urethane modified polyester resin has a glass transition temperature of about 40° C. to about 80° C. and an average number molecular weight of about 1000 to about 15,000, and the toner dispersant mixture has an average particle size of less than 30 microns.
Claim 50
Dependent Claim
21 words
The method according to claim 34, wherein the toner dispersant mixture has an average particle size of less than 30 microns.
Claim 51
Dependent Claim
52 words
The method according to claim 34, wherein the urethane modified polyester resin has a glass transition temperature of about 40° C. to about 80° C. and an average number molecular weight of about 1000 to about 15,000, and the toner dispersant mixture has an average particle size of less than 30 microns.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-10-18 | 1997-04-19 | 1997-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-10-18 | 2001-04-19 | 2001-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-10-18 | 2005-04-19 | 2005-10-19 | $7700.00 | Window Closed / Lapsed |