US4855204A
Expired / Lapsed
US
⏱️ 0.0 years remaining
White toner containing a high purity titanium dioxide pigment
Assignee: Kyocera Mita Industrial Co Ltd
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Filing: 1988-02-23
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Granted: 1989-08-08
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Expires: 2008-02-23
Abstract
Abstract A white toner comprising a fixing resin and dispersed therein, a titanium dioxide pigment of high purity containing at least 99% by weight of TiO 2 , not more than 0.1% by weight of Al 2 O 3 and not more than 0.05% by weight of SiO 2 as a white pigment. The white toner has markedly improved hygroscopicity as a result of using the white pigment in which the contents of metal oxides such as Al 2 O 3 and SiO 2 are reduced to very small amounts. The toner can thus retain the stable and uniform amount of triboelectric charge, and permits effective circumvention of troubles such as the reduction of image density, background fog and image blurring.
Inventors
- 👤 Masanori Fujii
- 👤 Shuji Komura
- 👤 Shunsuke Oogami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:46
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/09; G03G9/0902; G03B; G03B2217/00; G03B2217/005; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
68 words
A white toner comprising a fixing resin medium and dispersed therein a titanium dioxide pigment of high purity containing at least 99% by weight of TiO 2 , not more than 0.1% by weight of Al 2 O 3 and not more than 0.05% by weight of SiO 2 as a white pigment, said titanium dioxide pigment having an average particle diameter of not less than 0.05 microns.
Claim 2
Dependent Claim
68 words
A white toner comprising a fixing resin medium and dispersed therein a titanium dioxide pigment of high purity containing at least 99% by weight of TiO 2 , not more than 0.1% by weight of Al 2 O 3 and not more than 0.05% by weight of SiO 2 as a white pigment, said titanium dioxide pigment having an average particle diameter of not less than 0.05 microns.
Claim 3
Dependent Claim
23 words
The white toner of claim 1 wherein the amount of TiO 2 contained in the titanium dioxide is at least 99.5% by weight.
Claim 4
Dependent Claim
34 words
The white toner of claim 1 wherein the titanium dioxide pigment contains not more than 0.05% by weight of Al 2 O 3 and not more than 0.03% by weight of SiO 2 .
Claim 5
Dependent Claim
24 words
The white toner of claim 1 wherein the titanium dioxide pigment contains not more than 0.01% by weight of Fe 2 O 3 .
Claim 6
Dependent Claim
19 words
The white toner of claim 1 wherein the titanium dioxide pigment is not surface-treated with an aluminumor silicon-containing compound.
Claim 7
Dependent Claim
17 words
The white toner of claim 5 wherein the titanium dioxide pigment is produced by the chlorine method.
Claim 8
Dependent Claim
30 words
The white toner of claim 1 wherein the amount of the titanium dioxide pigment is 1 to 50 parts by weight per 100 parts by weight of the resin medium.
Claim 9
Dependent Claim
21 words
The white toner of claim 1 wherein the titanium dioxide pigment has an average particle diameter of 0.05 to 1.0 micron.
Claim 10
Dependent Claim
21 words
The white toner of claim 1 wherein the titanium dioxide pigment has an average particle diameter of 0.2 to 0.5 micron.
Claim 11
Dependent Claim
29 words
The white toner of claim 1 wherein the amount of titanium dioxide pigment is 2 to 30 parts by weight per 100 parts by weight of the resin medium.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-07 | 1993-02-06 | 1993-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-07 | 1997-02-06 | 1997-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-07 | 2001-02-06 | 2001-08-08 | $7700.00 | Window Closed / Lapsed |