US4882258A
Expired / Lapsed
US
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Toner for development of electrostatic image and electrostatic latent image developer
Assignee: Konica Minolta Inc
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Filing: 1988-02-29
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Granted: 1989-11-21
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Expires: 2008-02-29
Abstract
Abstract There are disclosed a toner for development of an electrostatic image which comprises containing (a) a mixture of a lower molecular weight polymer component and a higher molecular weight polymer component, and said lower molecular polymer component is a resin obtained by reacting a polymer containing a carboxylic acid component with a polyvalent metal compound to form cross-linking through a metal atom and (b) offset preventive agent; and also an electrostatic latent image developer which comprises (A) toner particles mainly comprising a resin obtained by reacting a carboxy group existing in a polymer component with a polyvalent metal compound and (B) resin coated-carrier particles coated with a fluorine-containing resin on a surface of a magnetic particle or inorganic fine particles.
Inventors
- 👤 Satoru Ikeuchi
- 👤 Mitutaka Arai
- 👤 Yuki Okuyama
- 👤 Akitoshi Matsubara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:58
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08784; G03G9/08793; G03G9/08702; G03G9/08726; G03G9/08791; G03G9/08795; G03G9/10; G03G9/113; G03G9/1132; G03G9/1133; G03G9/1134
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
133 words
A toner for developing an electrostatic image comprising a mixture of a lower molecular weight polymer component and a higher molecular weight polymer toner said lower molecular weight polymer component being a resin obtained by reacting a polymer comprising a styrene monomer, an acrylate or methacrylate monomer, and a half-ester compound obtained by esterification reaction of an acrylic acid derivative having a hydroxy group or a methacrylic acid derivative having a hydroxy group, with a dicarboxylic acid; with a polyvalent metal compound to form cross-linking through the metal atom, a local maximum value of said lower molecular weight polymer component being 1×10 3 to 2×10 4 , a local maximum value of said higher molecular weight polymer component being 1×10 5 to 2×10 6 , said toner further containing an offset preventive agent.
Claim 2
Dependent Claim
133 words
A toner for developing an electrostatic image comprising a mixture of a lower molecular weight polymer component and a higher molecular weight polymer toner said lower molecular weight polymer component being a resin obtained by reacting a polymer comprising a styrene monomer, an acrylate or methacrylate monomer, and a half-ester compound obtained by esterification reaction of an acrylic acid derivative having a hydroxy group or a methacrylic acid derivative having a hydroxy group, with a dicarboxylic acid; with a polyvalent metal compound to form cross-linking through the metal atom, a local maximum value of said lower molecular weight polymer component being 1×10 3 to 2×10 4 , a local maximum value of said higher molecular weight polymer component being 1×10 5 to 2×10 6 , said toner further containing an offset preventive agent.
Claim 3
Dependent Claim
61 words
The toner for development of electrostatic image according to claim 1, wherein both of said lower molecular weight polymer component and said higher molecular weight polymer component are obtained by (a) a styrene type monomer, (b) an acrylate or methacrylate type monomer and (c) a half ester compound obtained by esterification reaction having a hydroxyl group with a dicarboxylic acid, respectively.
Claim 4
Dependent Claim
61 words
The toner for development of electrostatic image according to claim 2, wherein said half ester compound is represented by the following formula: ##STR13## wherein R 1 represents a hydrogen atom or a methyl group and L represents a divalent linking group having an ester bonding in the molecular chain and having 3 or more carbon atoms, which may have a substituent(s).
Claim 5
Dependent Claim
77 words
The toner for development of electrostatic image according to claim 3, wherein said L in the formula is a divalent bonding group represented by: ##STR14## wherein R 3 and R 5 each represent a hydrogen atom or a methyl group, m and h each are an integer of 1 to 14 n is an integer of 0 to 8, and X represents a hydrogen atom, a halogen group element, a lower alkyl group or an alkoxy group
Claim 6
Dependent Claim
25 words
The toner for development of electrostatic image according to claim 1, wherein said metal compound is a compound of zinc or an alkaline earth metal.
Claim 7
Dependent Claim
24 words
The toner for development of electrostatic image according to claim 1, wherein said offset preventive agent is a non-polar substance and/or a polar substance.
Claim 8
Dependent Claim
31 words
The toner for development of electrostatic image according to claim 1, wherein said offset preventive agent is a non-polar substance or a mixture of a non-polar substance and a polar substance.
Claim 9
Dependent Claim
31 words
The toner for development of electrostatic image according to claim 6, wherein said non-polar substance is a polyolefin and said polar substance is an aliphatic acid ester and/or an alkylenebisaliphatic amide.
Claim 10
Dependent Claim
28 words
The toner for development of electrostatic image according to claim 1, wherein said offset preventive agent is a polyolefin and an aliphatic acid ester or an alkylenebisaliphatic amide.
Claim 11
Dependent Claim
147 words
An electrostatic image developer comprising toner particles containing a resin obtained by reacting a carboxy group of a polymer component with a polyvalent metal compound and, magnetic carrier particles surface coated with a fluorine-containing resin, said toner particles having a molecular weight distribution into at least a lower molecular weight polymer component and a higher molecular weight polymer component, a local maximum value of said lower molecular weight polymer component being 1×10 3 to 2×10 4 , a local maximum value of said higher molecular weight polymer component being 1×10 5 to 2×10 6 , said lower molecular weight polymer component being a resin obtained by reacting a polymer comprising a stryene monomer, an acrylate or methacrylic monomer, and a half-ester compound obtained by esterification reaction of an acrylic acid derivative having a hydroxy group or methacrylic acid derivative having a hydroxy group, with a dicarboxylic acid.
Claim 12
Dependent Claim
147 words
An electrostatic image developer comprising toner particles containing a resin obtained by reacting a carboxy group of a polymer component with a polyvalent metal compound and, magnetic carrier particles surface coated with a fluorine-containing resin, said toner particles having a molecular weight distribution into at least a lower molecular weight polymer component and a higher molecular weight polymer component, a local maximum value of said lower molecular weight polymer component being 1×10 3 to 2×10 4 , a local maximum value of said higher molecular weight polymer component being 1×10 5 to 2×10 6 , said lower molecular weight polymer component being a resin obtained by reacting a polymer comprising a stryene monomer, an acrylate or methacrylic monomer, and a half-ester compound obtained by esterification reaction of an acrylic acid derivative having a hydroxy group or methacrylic acid derivative having a hydroxy group, with a dicarboxylic acid.
Claim 13
Dependent Claim
24 words
The electrostatic latent image developer according to claim 10, wherein said metal compound is a zinc group compound or an alkaline earth metal compound.
Claim 14
Dependent Claim
49 words
The electrostatic latent image developer according to claim 10, wherein said fluorine-containing resin is represented by the following formula (VI): ##STR15## wherein R 8 represent a hydrogen atom or a methyl group, a is an integer of 1 to 8 and b is an integer of 1 to 19.
Claim 15
Dependent Claim
19 words
The electrostatic latent image developer according to claim 12, wherein said fluorine-containing resin is a vinylidene fluoride-tetrafluoro ethylene copolymer.
Claim 16
Dependent Claim
19 words
The electrostatic latent image developer according to claim 13, wherein said inorganic fine particles are hydrophobic silica fine particles.
Claim 17
Dependent Claim
154 words
An electrostatic image developer comprising toner particles containing a resin obtained by reacting a carboxy group with a polymer component with a polyvalent metal compound and, inorganic fine particles said toner particles having a molecular weight distribution divided into at least a lower molecular weight polymer component and a high molecular weight polymer component, a local maximum value of said lower molecular weight polymer component being 1×10 3 to 2×10 4 , a local maximum value of said higher molecular weight polymer component being 1×10 5 to 2×10 6 , said lower molecular weight polymer component being a resin obtained by reacting a polymer comprising a styrene monomer, an acrylate or methacrylate monomer, and a half-ester compound obtained by esterification reaction of an acrylic acid derivative having a hydroxy group or methacrylic acid derivative having a hydroxy group, with a dicarboxylic acid; with a polyvalent metal compound to form cross-linking through the metal atom.
Claim 18
Dependent Claim
154 words
An electrostatic image developer comprising toner particles containing a resin obtained by reacting a carboxy group with a polymer component with a polyvalent metal compound and, inorganic fine particles said toner particles having a molecular weight distribution divided into at least a lower molecular weight polymer component and a high molecular weight polymer component, a local maximum value of said lower molecular weight polymer component being 1×10 3 to 2×10 4 , a local maximum value of said higher molecular weight polymer component being 1×10 5 to 2×10 6 , said lower molecular weight polymer component being a resin obtained by reacting a polymer comprising a styrene monomer, an acrylate or methacrylate monomer, and a half-ester compound obtained by esterification reaction of an acrylic acid derivative having a hydroxy group or methacrylic acid derivative having a hydroxy group, with a dicarboxylic acid; with a polyvalent metal compound to form cross-linking through the metal atom.
Claim 19
Dependent Claim
58 words
The electrostatic latent image developer according to claim 15, wherein said half-ester compound is represented by the following formula: ##STR16## wherein R 1 represents a hydrogen atom or a methyl group and L represents a divalent linking group having an ester bonding in the molecular chain and having 3 or more carbon atoms, which may have a substituent(s).
Claim 20
Dependent Claim
24 words
The electrostatic latent image developer according to claim 15, wherein said metal compound is a zinc group compound or an alkaline earth metal compound.
Claim 21
Dependent Claim
49 words
The electrostatic latent image developer according to claim 15, wherein said fluorine-containing resin is represented by the following formula (VI): ##STR17## wherein R 8 represents a hydrogen atom or a methyl group, a is an integer of 1 to 8 and b is an integer of 1 to 19.
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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) | 1992-11-20 | 1993-05-22 | 1993-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-20 | 1997-05-22 | 1997-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-20 | 2001-05-22 | 2001-11-21 | $7700.00 | Window Closed / Lapsed |