US5695902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toner for developing electrostatic image, image forming method and process-cartridge
Assignee: Canon Inc
•
Filing: 1996-11-15
•
Granted: 1997-12-09
•
Expires: 2016-11-15
Abstract
Abstract A toner for developing an electrostatic image is formed as a mixture of toner particles containing at least a binder resin and a colorant, and inorganic fine powder. The inorganic fine powder includes: (A) inorganic fine powder (A) treated at least with silicone oil, and (B) inorganic fine powder (B) comprising a composite metal oxide including at least Si as a constituent element and having a weight-average particle size of 0.3-5 μm. Because of the inclusion of the two types of inorganic fine powders (A) and (B), the toner is stably provided with a high flowability and a high triboelectric charge under various environmental conditions including low-humidity to high-humidity conditions. The toner is suitably used in an image forming system including a contact-charging means, a contact-transfer means and a film (or surf)-fixing system.
Inventors
- 👤 Yushi Mikuriya
- 👤 Yuichi Mizoh
- 👤 Tadashi Doujo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:38
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/097; G03G9/09708; G03G9/09716
Claims Analysis
Total Claims: 62
Claim 1
Independent Claim
104 words
A toner for developing an electrostatic image comprising: toner particles containing at least a binder resin and a colorant, and inorganic fine powder; wherein the inorganic fine powder includes: (A) inorganic fine powder (A) treated at least with silicone oil, and (B) inorganic fine powder (B) comprising a composite metal oxide containing Sr and Si as constituent elements, and having a weight-average particle size of 0.3-5 μm, wherein the composite metal oxide comprises strontium silicate represented by Sr a Si b o c , wherein a denotes an integer of 1-9, b denotes an integer of 1-9 and c denotes an integer of 3-9.
Claim 2
Dependent Claim
104 words
A toner for developing an electrostatic image comprising: toner particles containing at least a binder resin and a colorant, and inorganic fine powder; wherein the inorganic fine powder includes: (A) inorganic fine powder (A) treated at least with silicone oil, and (B) inorganic fine powder (B) comprising a composite metal oxide containing Sr and Si as constituent elements, and having a weight-average particle size of 0.3-5 μm, wherein the composite metal oxide comprises strontium silicate represented by Sr a Si b o c , wherein a denotes an integer of 1-9, b denotes an integer of 1-9 and c denotes an integer of 3-9.
Claim 3
Dependent Claim
30 words
The toner according to claim 1, wherein the inorganic fine powder (A) has been treated with a silane coupling agent prior to or simultaneously with the treatment with silicone oil.
Claim 4
Dependent Claim
29 words
The toner according to claim 1, wherein the inorganic fine powder (A) has a specific surface area of 50-400 m 2 /g and a hydrophobicity of at least 95%.
Claim 5
Dependent Claim
28 words
The toner according to claim 1, wherein the silicone oil for providing the inorganic fine powder (A) has a viscosity at 25° C. of 5-2000 mm 2 /sec.
Claim 6
Dependent Claim
30 words
The toner according to claim 1, wherein the inorganic fine powder (A) has been obtained by treating 100 wt. parts of inorganic fine powder with 1.5-60 parts of silicone oil.
Claim 7
Dependent Claim
67 words
The toner according to claim 1, wherein the inorganic fine powder (A) has a charging polarity identical to that of the toner particles and has a charge Q1 satisfying |Q11|>150 (mC/kg) when triboelectrified with iron powder, and the inorganic fine powder (B) has a charging polarity opposite to that of the toner particles and has a charge Q1 satisfying |Q2|>3.7 (mC/kg) when triboelectrified with the toner particles.
Claim 8
Dependent Claim
25 words
The toner according to claim 1, wherein the inorganic fine powder (A) comprises a member selected from the group consisting of titania, alumina and silica.
Claim 9
Dependent Claim
26 words
The toner according to claim 1, wherein the inorganic fine powder (A) is contained in 0.05-3 wt. parts per 100 wt. parts of the toner particles.
Claim 10
Dependent Claim
26 words
The toner according to claim 1, wherein the inorganic fine powder (B) is contained in 0.05-15 wt. parts per 100 wt. parts of the toner particles.
Claim 11
Dependent Claim
20 words
The toner according to claim 1, wherein the inorganic fine powder (B) has a weight-average particle size of 0.5-3 μm.
Claim 12
Dependent Claim
23 words
The toner according to claim 1, wherein the composite metal oxide contains the metal Sr and Si in a ratio (a/b) of 1/9-9.0.
Claim 13
Dependent Claim
23 words
The toner according to claim 1, wherein the composite metal oxide contains the metal Sr and Si in a ratio (a/b) of 0.5-3.0.
Claim 14
Dependent Claim
41 words
The toner according to claim 1, wherein the composite metal oxide comprises a strontium silicate selected from the group consisting of SrSiO 3 , Sr 3 SiO 5 , Sr 2 SiO 4 and Sr 3 Si 2 O 7 .
Claim 15
Dependent Claim
15 words
The toner according to claim 1, wherein the composite metal oxide comprises SrSiO 3 .
Claim 16
Dependent Claim
19 words
The toner according to claim 1, wherein the toner particles have a negative triboelectric chargeability relative to iron powder.
Claim 17
Dependent Claim
18 words
The toner according to claim 1, wherein the toner particles have a weight-average particle size of 5.5-12 μm.
Claim 18
Dependent Claim
18 words
The toner according to claim 1, wherein the toner particles have a weight-average particle size of 5.5-9 μm.
Claim 19
Dependent Claim
183 words
An image forming method, comprising: charging an electrostatic image-bearing member by primary charging means: forming an electrostatic image on the charged electrostatic image-bearing member by exposure to light; developing the electrostatic image with a toner held developing means to form a toner image on the electrostatic image-bearing member; transferring the toner image on the electrostatic image-bearing member by transfer means onto a transfer-receiving material via or without via an intermediate transfer member, heat-fixing the toner image on the transfer-receiving material by heat-fixing means; wherein the toner comprises: toner particles containing at least a binder resin and a colorant, and inorganic fine powder; wherein the inorganic fine powder includes: (A) inorganic fine powder (A) treated at least with silicone oil, and (B) inorganic fine powder (B) comprising a composite metal oxide containing Sr and Si as constituent elements, and having a weight-average particle size of 0.3-5 μm, wherein the composite metal oxide comprises strontium silicate represented by Sr a S b O c , wherein a denotes an integer of 1-9, b denotes an integer of 1-9 and c denotes an integer of 3-9.
Claim 20
Dependent Claim
183 words
An image forming method, comprising: charging an electrostatic image-bearing member by primary charging means: forming an electrostatic image on the charged electrostatic image-bearing member by exposure to light; developing the electrostatic image with a toner held developing means to form a toner image on the electrostatic image-bearing member; transferring the toner image on the electrostatic image-bearing member by transfer means onto a transfer-receiving material via or without via an intermediate transfer member, heat-fixing the toner image on the transfer-receiving material by heat-fixing means; wherein the toner comprises: toner particles containing at least a binder resin and a colorant, and inorganic fine powder; wherein the inorganic fine powder includes: (A) inorganic fine powder (A) treated at least with silicone oil, and (B) inorganic fine powder (B) comprising a composite metal oxide containing Sr and Si as constituent elements, and having a weight-average particle size of 0.3-5 μm, wherein the composite metal oxide comprises strontium silicate represented by Sr a S b O c , wherein a denotes an integer of 1-9, b denotes an integer of 1-9 and c denotes an integer of 3-9.
Claim 21
Dependent Claim
30 words
The image forming method according to claim 18, wherein the electrostatic image-bearing member is charged by a contact-charging member as the primary charging means abutted against the electrostatic image-bearing member.
Claim 22
Dependent Claim
41 words
The image forming method according to claim 18, wherein the toner image on the electrostatic image-bearing member is transferred onto a transfer-receiving material by a contact-transfer member as the transfer means abutted against the electrostatic image-bearing member via the transfer-receiving material.
Claim 23
Dependent Claim
68 words
The image forming method according to claim 18, wherein the toner image is heat-fixed onto the transfer-receiving material by a heat-fixing device as the heat-fixing means comprising a heating member, a film disposed along the heating member and a pressing member disposed opposite to and pressed against the heating member via the film so as to press the transfer-receiving material intimately against the heating member via the film.
Claim 24
Dependent Claim
63 words
The image forming method according to claim 18, wherein the electrostatic image-bearing member is charged by a contact-charging member as the primary charging means abutted against the electrostatic image-bearing member; and the toner image on the electrostatic image-bearing member is transferred onto a transfer-receiving material by a contact-transfer member as the transfer means abutted against the electrostatic image-bearing member via the transfer-receiving material.
Claim 25
Dependent Claim
122 words
The image forming method according to claim 18, wherein the electrostatic image-bearing member is charged by a contact-charging member as the primary charging means abutted against the electrostatic image-bearing member: the toner image on the electrostatic image-bearing member is transferred onto a transfer-receiving material by a contact-transfer member as the transfer means abutted against the electrostatic image-bearing member via the transfer-receiving material; and the toner image is heat-fixed onto the transfer-receiving material by a heat-fixing device as the heat-fixing means comprising a heating member, a film disposed along the heating member and a pressing member disposed opposite to and pressed against the heating member via the film so as to press the transfer-receiving material intimately against the heating member via the film.
Claim 26
Dependent Claim
32 words
The image forming method according to claim 18, wherein the inorganic fine powder (A) has been treated with a silane coupling agent prior to or simultaneously with the treatment with silicone oil.
Claim 27
Dependent Claim
31 words
The image forming method according to claim 18, wherein the inorganic fine powder (A) has a specific surface area of 50-400 m 2 /g and a hydrophobicity of at least 95%.
Claim 28
Dependent Claim
30 words
The image forming method according to claim 18, wherein the silicone oil for providing the inorganic fine powder (A) has a viscosity at 25° C. of 5-2000 mm 2 /sec.
Claim 29
Dependent Claim
32 words
The image forming method according to claim 18, wherein the inorganic fine powder (A) has been obtained by treating 100 wt. parts of inorganic fine powder with 1.5-60 parts of silicone oil.
Claim 30
Dependent Claim
69 words
The image forming method according to claim 18, wherein the inorganic fine powder (A) has a charging polarity identical to that of the toner particles and has a charge Q1 satisfying |Q11|>150 (mC/kg) when triboelectrified with iron powder, and the inorganic fine powder (B) has a charging polarity opposite to that of the toner particles and has a charge Q1 satisfying |Q2|>3.7 (mC/kg) when triboelectrified with the toner particles.
Claim 31
Dependent Claim
27 words
The image forming method according to claim 18, wherein the inorganic fine powder (A) comprises a member selected from the group consisting of titania, alumina and silica.
Claim 32
Dependent Claim
28 words
The image forming method according to claim 21, wherein the inorganic fine powder (A) is contained in 0.05-3 wt. parts per 100 wt. parts of the toner particles.
Claim 33
Dependent Claim
28 words
The image forming method according to claim 18, wherein the inorganic fine powder (B) is contained in 0.05-15 wt. parts per 100 wt. parts of the toner particles.
Claim 34
Dependent Claim
22 words
The image forming method according to claim 18, wherein the inorganic fine powder (B) has a weight-average particle size of 0.5-3 μm.
Claim 35
Dependent Claim
24 words
The image forming method according to claim 18, wherein the composite metal oxide contains the Sr and Si in a ratio (a/b) of 1/9-9.0.
Claim 36
Dependent Claim
25 words
The image forming method according to claim 18, wherein the composite metal oxide contains the metal M and Si in a ratio (a/b) of 0.5-3.0.
Claim 37
Dependent Claim
43 words
The image forming method according to claim 18, wherein the composite metal oxide comprises a strontium silicate selected from the group consisting of SrSiO 3 , Sr 3 SiO 5 , Sr 2 SiO 4 and Sr 3 Si 2 O 7 .
Claim 38
Dependent Claim
17 words
The image forming method according to claim 18, wherein the composite metal oxide comprises SrSiO 3 .
Claim 39
Dependent Claim
21 words
The image forming method according to claim 18, wherein the toner particles have a negative triboelectric chargeability relative to iron powder.
Claim 40
Dependent Claim
20 words
The image forming method according to claim 18, wherein the toner particles have a weight-average particle size of 5.5-12 μm.
Claim 41
Dependent Claim
20 words
The image forming method according to claim 18, wherein the toner particles have a weight-average particle size of 5.5-9 μm.
Claim 42
Dependent Claim
155 words
A process cartridge, comprising: an electrostatic image-bearing member, and developing means for developing an electrostatic image formed on the electrostatic image-bearing member with a toner contained therein; the electrostatic image-bearing member and the developing means being integrally assembled to form a cartridge, which is detachably mountable to a main assembly of the image forming apparatus; wherein the toner comprises: toner particles containing at least a binder resin and a colorant, and inorganic rind powder; wherein the inorganic fine powder includes: (A) inorganic fine powder (A) treated at least with silicone oil, and (B) inorganic fine powder (B) comprising a composite metal oxide containing Sr and Si as constituent elements, and having a weight-average particle size of 0.3-5 μm, wherein the composite metal oxide comprise, strontium silicate represented by Sr a Si b O c , wherein a denotes an integer of 1-9, b denotes an integer of 1-9 and c denotes an integer of 3-9.
Claim 43
Dependent Claim
155 words
A process cartridge, comprising: an electrostatic image-bearing member, and developing means for developing an electrostatic image formed on the electrostatic image-bearing member with a toner contained therein; the electrostatic image-bearing member and the developing means being integrally assembled to form a cartridge, which is detachably mountable to a main assembly of the image forming apparatus; wherein the toner comprises: toner particles containing at least a binder resin and a colorant, and inorganic rind powder; wherein the inorganic fine powder includes: (A) inorganic fine powder (A) treated at least with silicone oil, and (B) inorganic fine powder (B) comprising a composite metal oxide containing Sr and Si as constituent elements, and having a weight-average particle size of 0.3-5 μm, wherein the composite metal oxide comprise, strontium silicate represented by Sr a Si b O c , wherein a denotes an integer of 1-9, b denotes an integer of 1-9 and c denotes an integer of 3-9.
Claim 44
Dependent Claim
23 words
The process-cartridge according to claim 40, further comprising a contact-charging member abutted against the electrostatic image-bearing member to charge the electrostatic image-bearing member.
Claim 45
Dependent Claim
23 words
The process-cartridge according to claim 32, further comprising a cleaning member abutted against the electrostatic image-bearing member to clear the electrostatic image-bearing member.
Claim 46
Dependent Claim
38 words
The process-cartridge according to claim 40, further comprising: a contact-charging member abutted against the electrostatic image-bearing member to charge the electrostatic image-bearing member; a cleaning member abutted against the electrostatic image-bearing member to clear the electrostatic image-bearing member.
Claim 47
Dependent Claim
30 words
The process-cartridge according to claim 40, wherein the inorganic fine powder (A) has been treated with a silane coupling agent prior to or simultaneously with the treatment with silicone oil.
Claim 48
Dependent Claim
29 words
The process-cartridge according to claim 40, wherein the inorganic fine powder (A) has a specific surface area of 50-400 m 2 /g and a hydrophobicity of at least 95%.
Claim 49
Dependent Claim
28 words
The process-cartridge according to claim 40, wherein the silicone oil for providing the inorganic fine powder (A) has a viscosity at 25° C. of 5-2000 mm 2 /sec.
Claim 50
Dependent Claim
30 words
The process-cartridge according to claim 40, wherein the inorganic fine powder (A) has been obtained by treating 100 wt. parts of inorganic fine powder with 1.5-60 parts of silicone oil.
Claim 51
Dependent Claim
67 words
The process-cartridge according to claim 40, wherein the inorganic fine powder (A) has a charging polarity identical to that of the toner particles and has a charge Q1 satisfying |Q11|>150 (mC/kg) when triboelectrified with iron powder, and the inorganic fine powder (B) has a charging polarity opposite to that of the toner particles and has a charge Q1 satisfying |Q2|>3.7 (mC/kg) when triboelectrified with the toner particles.
Claim 52
Dependent Claim
25 words
The process-cartridge according to claim 40, wherein the inorganic fine powder (A) comprises a member selected from the group consisting of titania, alumina and silica.
Claim 53
Dependent Claim
26 words
The process-cartridge according to claim 40, wherein the inorganic fine powder (A) is contained in 0.05-3 wt. parts per 100 wt. parts of the toner particles.
Claim 54
Dependent Claim
26 words
The process-cartridge according to claim 40, wherein the inorganic fine powder (B) is contained in 0.05-15 wt. parts per 100 wt. parts of the toner particles.
Claim 55
Dependent Claim
20 words
The process-cartridge according to claim 40, wherein the inorganic fine powder (B) has a weight-average particle size of 0.5-3 μm.
Claim 56
Dependent Claim
22 words
The process-cartridge according to claim 40, wherein the composite metal oxide contains the Sr and Si in a ratio (a/b) of 1/9-9.0.
Claim 57
Dependent Claim
22 words
The process-cartridge according to claim 40, wherein the composite metal oxide contains the Sr and Si in a ratio (a/b) of 0.5-3.0.
Claim 58
Dependent Claim
41 words
The process-cartridge according to claim 40, wherein the composite metal oxide comprises a strontium silicate selected from the group consisting of SrSiO 3 , Sr 3 SiO 5 , Sr 2 SiO 4 and Sr 3 Si 2 O 7 .
Claim 59
Dependent Claim
15 words
The process-cartridge according to claim 40, wherein the composite metal oxide comprises SrSiO 3 .
Claim 60
Dependent Claim
19 words
The process-cartridge according to claim 40, wherein the toner particles have a negative triboelectric chargeability relative to iron powder.
Claim 61
Dependent Claim
18 words
The process-cartridge according to claim 40, wherein the toner particles have a weight-average particle size of 5.5-12 μm.
Claim 62
Dependent Claim
18 words
The process-cartridge according to claim 40, wherein the toner particles have a weight-average particle size of 5.5-9 μm.
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