US4576888A
Expired / Lapsed
US
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Toner for electrophotography comprising azoic pigment having silica core
Assignee: Kyocera Mita Industrial Co Ltd
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Filing: 1984-02-24
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Granted: 1986-03-18
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Expires: 2004-02-24
Abstract
Abstract A toner for electrophotography, comprising an azoic pigment having a silica core as a coloring component, said azoic pigment comprising a core of a fine powder of silica and a coating of a mono- or polyazoic dye chemically bound to the surface of the silica core through an aminosilane coupling agent.
Inventors
- 👤 Nobuhiro Miyakawa
- 👤 Kouji Maekawa
- 👤 Teruaki Higashiguchi
- 👤 Kaname Nakatani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:07
CPC Classifications
C; C09; C09B; C09B69/00; C09B69/008; G; G03; G03G; G03G9/00; G03G9/08; G03G9/09; G03G9/0906; G03G9/091; G03G9/097; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2995
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
56 words
A toner for electrophotography, comprising an azoic pigment having a silica core as a coloring component, and a resin medium for fixation, said azoic pigment comprising a core of a fine powder of silica and a coating of a monoor polyazoic dye chemically bound to the surface of the silica core through an aminosilane coupling agent.
Claim 2
Dependent Claim
56 words
A toner for electrophotography, comprising an azoic pigment having a silica core as a coloring component, and a resin medium for fixation, said azoic pigment comprising a core of a fine powder of silica and a coating of a monoor polyazoic dye chemically bound to the surface of the silica core through an aminosilane coupling agent.
Claim 3
Dependent Claim
20 words
The toner of claim 1 wherein the fine silica powder has a particle diameter of not more than 10 microns.
Claim 4
Dependent Claim
22 words
The toner of claim 1 wherein the fine silica powder has a surface OH density of at least 0.01/100 Å 2 .
Claim 5
Dependent Claim
78 words
The toner of claim 1 wherein the aminosilane coupling agent is selected from compounds represented by the following formula (R.sup.2 O).sub.m R.sub.n.sup.3 Si--R.sup.1 --NH.sub.2 (II) wherein R 1 represents a lower alkylene group which may contain --NH-- or --NHCO-- in the chain, R 2 represents a lower alkyl group, R 3 represents a hydrogen atom or a lower alkyl group, m is an integer of 1 to 3, and n is 0, 1 or 2 provided that m+n=3.
Claim 6
Dependent Claim
71 words
The toner of claim 4 wherein the aminosilane coupling agent is selected from (C.sub.2 H.sub.5 O).sub.3 Si--CH.sub.2 CH.sub.2 CH.sub.2 --NH.sub.2, (CH.sub.3 O).sub.2 (CH.sub.3)Si--CH.sub.2 CH.sub.2 CH.sub.2 --NH--CH.sub.2 CH.sub.2 --NH.sub.2, (CH.sub.3 O).sub.3 Si--CH.sub.2 CH.sub.2 CH.sub.2 --NH--CH.sub.2 CH.sub.2 --NH.sub.2, (C.sub.2 H.sub.5 O).sub.3 Si--CH.sub.2 CH.sub.2 CH.sub.2 --NHCO--NH.sub.2, (CH.sub.3 O).sub.3 Si--CH.sub.2 CH.sub.2 CH.sub.2 --NH.sub.2, (C.sub.2 H.sub.5 O).sub.2 (CH.sub.3)Si--CH.sub.2 CH.sub.2 CH.sub.2 --NH.sub.2, (CH.sub.3 O)(CH.sub.3).sub.2 Si--CH.sub.2 CH.sub.2 CH.sub.2 CH.sub.2 --NH.sub.2, and (C.sub.2 H.sub.5 O)(CH.sub.3).sub.2 Si--CH.sub.2 CH.sub.2 CH.sub.2 --NH.sub.2.
Claim 7
Dependent Claim
75 words
The toner of claim 1 wherein the azoic pigment has a basic structure represented by the following formula ##STR119## wherein ○SP represents the fine powder of silica, R 1 represents a lower alkylene group which may contain --NH-- or --NHCO-- in the chain; Z represents --NHCO, ##STR120## --N═CH--, --NH--CH 2 --, --NHSO 2 --, or ##STR121## D represents a residue of a mono- or polyazoic dye; and l is a number of at least 1.
Claim 8
Dependent Claim
61 words
The toner of claim 6 wherein D is selected from --AR.sup.1 --N═N--Ar.sup.2 ( 1) --Ar.sup.1 --N═N--Ar.sup.3 --N═N--Ar.sup.2 ( 2) --Ar.sup.1 --NHCO--Ar.sup.4 --N═N--Ar.sup.2 ( 3) --Ar.sup.1 --CONH--Ar.sup.5 --N═N--Ar.sup.6 --N═N--Ar.sup.2 ( 4) ##STR122## wherein Ar.sup.1, Ar.sup.3, Ar.sup.4, Ar.sup.5 and Ar.sup.6, independently from each other, represent a phenylene or naphthylene group which may be substituted, and Ar.sup.2 represents a group of a coupling component.
Claim 9
Dependent Claim
35 words
The toner of claim 1 wherein the resin medium is an electrically insulating thermoplastic resin selected from polystyrene resins, polyalkylene resins, polyamide resins, polyester resins, polyvinyl acetal resin, acrylic resins, methacrylic resins and epoxy resins.
Claim 10
Dependent Claim
34 words
The toner of claim 8 wherein the electrically insulating thermoplastic resin is selected from a styrene/methyl methacrylate copolymer, a styrene/ethyl methacrylate copolymer, a styrene/butyl methacrylate copolymer, a styrene/2-ethylhexyl acrylate copolymer and a styrene/butadiene copolymer.
Claim 11
Dependent Claim
21 words
The toner of claim 1 wherein the resin medium for fixation has a glass transition temperature of at least 45° C.
Claim 12
Dependent Claim
28 words
The toner of claim 1 wherein the amount of the azoic pigment is 2 to 25 parts by weight per 100 parts by weight of the resin medium.
Claim 13
Dependent Claim
20 words
The toner of claim 1 wherein the fine silica powder has a particle diameter of not more than 5 microns.
Claim 14
Dependent Claim
22 words
The toner of claim 1 wherein the fine silica powder has a surface OH density of at least 1/100 Å 2 .
Claim 15
Dependent Claim
68 words
The toner of claim 1 wherein the azoic pigment has a basic structure represented by the following formula ##STR123## wherein ○SP represents the fine powder of silica, R 1 represents a lower alkylene group which may contain --NH-- or --NHCO-- in the chain; Z represents an amino bridging member; D represents a residue of a mono- or polyazoic dye; and l is a number of at least 1.
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) | 1989-03-17 | 1989-09-16 | 1990-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-17 | 1993-09-16 | 1994-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-17 | 1997-09-16 | 1998-03-18 | $7700.00 | Window Closed / Lapsed |