US5660964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Developer containing two kinds of wax
Assignee: Minolta Co Ltd
•
Filing: 1995-11-13
•
Granted: 1997-08-26
•
Expires: 2015-11-13
Abstract
Abstract A monocomponent developer comprising a binder resin, a colorant and first and second offset preventing agents, wherein a softening point of said binder resin (Tm 1 ), that of said first offset preventing agent (Tm 2 ) and that of said second offset preventing agent (Tm 3 ) satisfies relationship; Tm.sub.2 <Tm.sub.1 ≦Tm.sub.3 a heat quantity change of said first offset preventing agent (ΔH 2 ) and that of the second offset preventing agent (ΔH 3 ) satisfies relationship; 0.20 (mJ/mg)≦ΔH.sub.2 -ΔH.sub.3 ≦1.50 (mJ/mg) A toner comprising a binder resin comprising (a) polyester resin made of etherified diphenol and dicarboxylic acid, and having an acid value of 15 to 50, (b) a colorant, (c) a first offset preventing agent having a softening point of 60° to 110° C. and an acid value of 3 to 45; and (d) a second offset preventing agent having a softening point of 110° to 150° C. and an acid value of 1 to 30.
Inventors
- 👤 Junji Machida
- 👤 Tetsuo Sano
- 👤 Yoshitaka Sekiguchi
- 👤 Chikara Tsutsui
- 👤 Masaaki Takama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:43
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08775; G03G9/08782; G03G9/08742; G03G9/08755; G03G9/08784; G03G9/08797
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
194 words
A developer for use in an image forming apparatus which forms an electrostatic latent image on an electrostatic latent image carrying member, develops said latent image by a developer provided from a developing device, transfers an image obtained by the developing onto a recording member and fixes the image on the recording member by a heat roll fixing device, said developer comprising a toner including a binder resin, a colorant and first and second offset preventing agents, and wherein the total amount of said first and second offset preventing agents is in the range of from 2 to 7 parts by weight per 100 parts by weight of the binder resin, and the softening points of said binder resin (Tm 1 ), of said first offset preventing agent (Tm 2 ) and of said second offset preventing agent (Tm 3 ) satisfy the following relationship: Tm.sub.2 <Tm.sub.1 ≦Tm.sub.3 (I) and the heat quantity change of said first offset preventing agent (ΔH 2 ) and of the second offset preventing agent (ΔH 3 ) satisfy following relationship: 0.20 (mJ/mg)≦ΔH.sub.2 -ΔH.sub.3 ≦1.50 (mJ/mg) (II) when said heat quantity changes are measured by a differential scanning calorimeter.
Claim 2
Dependent Claim
194 words
A developer for use in an image forming apparatus which forms an electrostatic latent image on an electrostatic latent image carrying member, develops said latent image by a developer provided from a developing device, transfers an image obtained by the developing onto a recording member and fixes the image on the recording member by a heat roll fixing device, said developer comprising a toner including a binder resin, a colorant and first and second offset preventing agents, and wherein the total amount of said first and second offset preventing agents is in the range of from 2 to 7 parts by weight per 100 parts by weight of the binder resin, and the softening points of said binder resin (Tm 1 ), of said first offset preventing agent (Tm 2 ) and of said second offset preventing agent (Tm 3 ) satisfy the following relationship: Tm.sub.2 <Tm.sub.1 ≦Tm.sub.3 (I) and the heat quantity change of said first offset preventing agent (ΔH 2 ) and of the second offset preventing agent (ΔH 3 ) satisfy following relationship: 0.20 (mJ/mg)≦ΔH.sub.2 -ΔH.sub.3 ≦1.50 (mJ/mg) (II) when said heat quantity changes are measured by a differential scanning calorimeter.
Claim 3
Dependent Claim
35 words
The developer as claimed in claim 1 wherein said first and second offset preventing agents each have an endothermic peak within the range of from 80° to 150° C. in a differential scanning calorimetry curve.
Claim 4
Dependent Claim
44 words
The developer as claimed in claim 1 wherein Tm 1 is in the range of from 80° to 140° C., Tm 2 is in the range of from 60° to 110° and Tm 3 is in the range of from 110° to 150° C.
Claim 5
Dependent Claim
45 words
The developer as claimed in claim 3 wherein Tm 1 is in the range of from 90° to 130° C. Tm 2 is in the rage of from 80° to 100° C. and Tm 3 is in the range of from 130° to 150° C.
Claim 6
Dependent Claim
18 words
The developer as claimed in claim 3 wherein Tm 2 ≦Tm 1 -10° C. and Tm 3 ≧Tm1+10°.
Claim 7
Dependent Claim
63 words
The developer as claimed in claim 1 wherein said first offset preventing agent is contained in an amount of from 1 to 6 parts by weight per 100 parts by weight of the binder resin and said second offset preventing agent is contained in an amount of from 0.5 to 5 parts by weight per 100 parts by weight of the binder resin.
Claim 8
Dependent Claim
42 words
The developer as claimed in claim 1 wherein said first offset preventing agent contains at least one compound selected from the group consisting of carnauba wax, Fischer-Tropsch wax, rice wax, candelilla wax, jojoba oil wax, beeswax, polyethylene wax and oxidized polyethylene wax.
Claim 9
Dependent Claim
35 words
The developer as claimed in claim 1 wherein said second offset preventing agent contains at least one compound selected from the group consisting of polyethylene wax, polypropylene wax, oxidized polyethylene wax and oxidized polypropylene wax.
Claim 10
Dependent Claim
71 words
The developer as claimed in claim 1 wherein said toner further comprising a fluidizing agent treated by a hydrophobic agent selected from the group consisting of silane coupling agent, titanium coupling agent, higher fatty acid and silicone oil, said fluidizing agent being mixed with the toner and amount of said fluidizing agent being in the range of 0.05 to 5 parts by weight per 100 parts by weight of the toner.
Claim 11
Dependent Claim
16 words
The developer as claimed in claim 1 wherein said developing device comprises a monocomponent developing device.
Claim 12
Dependent Claim
15 words
The developer as claimed in claim 10 wherein said developing device accommodates non-magnetic monocomponent developer.
Claim 13
Dependent Claim
26 words
The developer as claimed in claim 1 wherein said heat roll fixing device has a pair of rollers having a diameter of 25 mm or less.
Claim 14
Dependent Claim
14 words
The developer as claimed in claim 12, wherein said heat rollers have different diameters.
Claim 15
Dependent Claim
43 words
The developer as claimed in claim 1, wherein said image forming apparatus includes a developing device which performs contact developing against an electrostatic latent image carrying member, said developing device having means for withdrawing residual toner and means for developing electrostatic latent images.
Claim 16
Dependent Claim
181 words
A toner comprising: a binder resin comprising a polyester resin made of etherified diphenol and dicarboxylic acid, said polyester resin having a glass transition point in the range of from 55° to 70° C. and a softening point in the range of from 80° to 140° C.; a colorant; a first offset preventing agent having a softening point in the range of from 60° to 110° C. and being present in an amount in the range of from 1 to 6 parts by weight per 100 parts by weight of said binder resin; and a second offset preventing agent having a softening point in the range of from 110° to 150° C. and being present in an amount in the range of from 0.5 to 5 parts by weight, said first offset preventing agent being present in an amount which is greater than said second offset preventing agent, and wherein the softening point of said binder resin (Tm1), of said first offset preventing agent (Tm2) and of said second offset preventing agent (Tm3) satisfy the following relationship: Tm.sub.2 <Tm.sub.1 ≦Tm.sub.3 (I).
Claim 17
Dependent Claim
181 words
A toner comprising: a binder resin comprising a polyester resin made of etherified diphenol and dicarboxylic acid, said polyester resin having a glass transition point in the range of from 55° to 70° C. and a softening point in the range of from 80° to 140° C.; a colorant; a first offset preventing agent having a softening point in the range of from 60° to 110° C. and being present in an amount in the range of from 1 to 6 parts by weight per 100 parts by weight of said binder resin; and a second offset preventing agent having a softening point in the range of from 110° to 150° C. and being present in an amount in the range of from 0.5 to 5 parts by weight, said first offset preventing agent being present in an amount which is greater than said second offset preventing agent, and wherein the softening point of said binder resin (Tm1), of said first offset preventing agent (Tm2) and of said second offset preventing agent (Tm3) satisfy the following relationship: Tm.sub.2 <Tm.sub.1 ≦Tm.sub.3 (I).
Claim 18
Dependent Claim
45 words
The toner as claimed in claim 15 wherein Tm 1 is in the range of from 90° to 130° C., Tm 2 is in the range of from 80° to 100° C. and Tm 3 is in the range of from 130° to 150° C.
Claim 19
Dependent Claim
17 words
The toner as claimed in claim 15 wherein Tm 2 ≦Tm 1 -10° and Tm 3 ≧Tm1+10°.
Claim 20
Dependent Claim
65 words
The toner as claimed in claim 15 wherein said first offset preventing agent is present in an amount in the range of from 2 to 5 parts by weight per 100 parts by weight and said second offset preventing agent is present in an amount in the range of from 1 to 3 parts by weight per 100 parts by weight of the binder resin.
Claim 21
Dependent Claim
91 words
A toner comprising: a binder resin comprising polyester resin made of etherified diphenol and dicarboxylic acid, said polyester resin having an acid value in the range of from 15 to 50; a colorant; a first offset preventing agent having a softening point in the range of from 60° to 110° C. and an acid value of from 3 to 45; and a second offset preventing agent having a softening point in the range of from 110° to 150° C. and an acid value in the range of from 1 to 30.
Claim 22
Dependent Claim
91 words
A toner comprising: a binder resin comprising polyester resin made of etherified diphenol and dicarboxylic acid, said polyester resin having an acid value in the range of from 15 to 50; a colorant; a first offset preventing agent having a softening point in the range of from 60° to 110° C. and an acid value of from 3 to 45; and a second offset preventing agent having a softening point in the range of from 110° to 150° C. and an acid value in the range of from 1 to 30.
Claim 23
Dependent Claim
57 words
The toner as claimed in claim 19 wherein said acid value of the polyester resin is in the range of from 20 to 40, that of the first offset preventing agent is in the range of from 3 to 35 and that of the second offset preventing agent is in the range of from 1 to 30.
Claim 24
Dependent Claim
68 words
The toner as claimed in claim 19 wherein said first offset preventing agent is present in amount in the range of from 1 to 6 parts by weight per 100 parts by weight of the binder resin and said second offset preventing agent is present in an amount in the range of from 0.5 to 5 parts by weight per 100 parts by weight of the binder resin.
Claim 25
Dependent Claim
40 words
The toner as claim in claim 19 wherein said first offset preventing agent comprises at least one compound selected from the group consisting of carnauba wax, Fischer-Tropsch wax, rice wax, candelilla wax, jojoba oil wax, beeswax, and oxidized polyethylene wax.
Claim 26
Dependent Claim
31 words
The developer as claimed in claim 19, wherein said second offset preventing agent comprises at least one compound selected from the group consisting of oxidized polyethylene wax and oxidized polypropylene wax.
Claim 27
Dependent Claim
30 words
The developer as claimed in claim 19 wherein said first offset preventing agent is present in an amount which is greater that the amount of said second offset preventing agent.
Claim 28
Dependent Claim
29 words
The developer as claimed in claim 24 wherein the first offset preventing agent has an acid value larger than that the acid value of the second offset preventing agent.
Claim 29
Dependent Claim
72 words
The developer as claimed in claim 15 wherein said toner further comprising a fluidizing agent treated by a hydrophobic agent selected from the group consisting of silane coupling agent, titanium coupling agent, higher fatty acid and silicone oil, said fluidizing agent being mixed with the toner and wherein said fluidizing agent is present in the range of from 0.05 to 5 parts by weight per 100 parts by weight of the toner.
Claim 30
Dependent Claim
72 words
The developer as claimed in claim 19 wherein said toner further comprising a fluidizing agent treated by a hydrophobic agent selected from the group consisting of silane coupling agent, titanium coupling agent, higher fatty acid and silicone oil, said fluidizing agent being mixed with the toner and wherein said fluidizing agent is present in the range of from 0.05 to 5 parts by weight per 100 parts by weight of the toner.
References Cited (Backward Citations)
US4917982A
Cited
EP0163528A2
Cited
US4810612A
Cited
US5079123A
Cited
US5045425A
Cited
US5124225A
Cited
US5176978A
Cited
US5292609A
Cited
US5238797A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-08-25 | 2001-02-24 | 2001-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-08-25 | 2005-02-24 | 2005-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-08-25 | 2009-02-24 | 2009-08-26 | $7700.00 | Window Closed / Lapsed |