US4883734A
Expired / Lapsed
US
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Toner for development of electrostatic image and method of fixing employing the same
Assignee: Konica Minolta Inc
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Filing: 1988-03-01
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Granted: 1989-11-28
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Expires: 2008-03-01
Abstract
Abstract Disclosed are a toner for development of electrostatic image, comprising as the main component a resin obtained by allowing a polymer containing a polymer component with low molecular weight and a polymer component with high molecular weight, at least the polymer component with low molecular weight containing a carboxylic acid component, to react with a polyvalent metal compound, and a method of fixing a toner image employing the toner described above. According to the present invention, there can be provided a toner for development of electrostatic image which has more improved fixability without lowering the anti-off-set property already improved, and also which can be prepared with good reproducibility without causing gelation to occur although the metal compound may be formulated therein, and can be improved in fixability without making charging characteristics unstable and at the same time without bringing about lowering in anti-off-set property, and thus an excellent toner image can be fixed.
Inventors
- 👤 Satoru Ikeuchi
- 👤 Mitutaka Arai
- 👤 Yuki Okuyama
- 👤 Hideki Yuri
- 👤 Tomoo Shiohara
- 👤 Yasuhiko Oyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:39
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08702; G03G9/08726
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
148 words
A toner for developing an electrostatic image comprising, as a main component, a resin obtained by allowing a polymer containing a low molecular weight polymer component and a high molecular weight polymer component, wherein at least said lower molecular weight polymer component contains a carboxylic acid component; to react with a polyvalent metal compound, said low molecular weight polymer component being obtained from (a) a styrene monomer, (b) an acrylic acid ester or methacrylic acid ester type monomer, and (c) a half ester compound obtained by subjecting an acrylic acid or methacrylic acid type derivative having a hydroxyl group to an esterification reaction with a dicarboxylic acid, said low molecular weight polymer component having a maximum molecular weight distribution of 1×10 3 to 2×10 4 , said polymer component of high molecular weight having a maximum molecular weight distribution of 10 5 to 2 × 10 6 .
Claim 2
Dependent Claim
148 words
A toner for developing an electrostatic image comprising, as a main component, a resin obtained by allowing a polymer containing a low molecular weight polymer component and a high molecular weight polymer component, wherein at least said lower molecular weight polymer component contains a carboxylic acid component; to react with a polyvalent metal compound, said low molecular weight polymer component being obtained from (a) a styrene monomer, (b) an acrylic acid ester or methacrylic acid ester type monomer, and (c) a half ester compound obtained by subjecting an acrylic acid or methacrylic acid type derivative having a hydroxyl group to an esterification reaction with a dicarboxylic acid, said low molecular weight polymer component having a maximum molecular weight distribution of 1×10 3 to 2×10 4 , said polymer component of high molecular weight having a maximum molecular weight distribution of 10 5 to 2 × 10 6 .
Claim 3
Dependent Claim
76 words
The toner for development of electrostatic image according to claim 1, wherein both of said polymer component with low molecular weight and said polymer component with high molecular weight are obtained from a styrene type monomer (a), an acrylic acid ester or methacrylic acid ester type monomer (b), and a half ester compound (c) obtained by subjecting an acrylic acid or methacrylic acid type derivative having a hydroxyl group to esterification reaction with a dicarboxylic acid.
Claim 4
Dependent Claim
53 words
The toner for development of electrostatic image according to claim 1, wherein said half ester compound (c) is represented by the formula: ##STR6## wherein L represents a divalent bonding group having 3 or more carbon atoms and an ester linkage in the molecular chain, and R 1 represents hydrogen atom or methyl group.
Claim 5
Dependent Claim
41 words
The toner of claim 3 wherein L is represented by the formula: ##STR7## wherein R 2 represents hydrogen or a methyl group, h is an integer of to 14, x is hydrogen, halogen, a lower alkyl group, or an alkoxy group.
Claim 6
Dependent Claim
22 words
The toner of claim 4 wherein said metal compound is a compound of a zinc group metal or an alkaline earth metal.
Claim 7
Dependent Claim
47 words
The toner for development of electrostatic image according to claim 3, wherein L in the above formula is a divalent bonding group represented by the formula: ##STR8## wherein R 2 represents hydrogen atom or methyl group, m is 1 to 14 and n is 0 to 8.
Claim 8
Dependent Claim
28 words
The toner for development of electrostatic image according to claim 1, wherein said metal compound is a compound of a zinc group metal or an alkaline earth metal.
Claim 9
Dependent Claim
47 words
The toner for development of electrostatic image according to claim 1, wherein the metal of said polyvalent metal compound is selected from the group consisting of Cu, Ag, Be, Mg, Ca, Sr, Ba, Zn, Cd, Al, Ti, Ge, Sn, V, Cr, Mo, Mn, Fe, Co and Ni.
Claim 10
Dependent Claim
155 words
The toner for development of electrostatic image according to claim 1, wherein said polymer component with low molecular weight has a maximum value of the molecular weight distribution at 1×10 3 to 2×10 4 , and said polymer component with high molecular weight has a maximum value of the molecular weight distribution at 10 5 to 2×10 6 ; said polymer component with low molecular weight is obtained from a styrene type monomer (a), an acrylic acid ester or methacrylic acid ester type monomer (b), and a half ester compound (c) represented by the formula: ##STR9## wherein R 1 represents hydrogen atom or methyl group and L represents a divalent bonding group represented by the formula: ##STR10## (wherein R 2 represents hydrogen atom or methyl group, m is 1 to 14 and n is 0 to 8), and said polyvalent metal compound is a compound of a zinc group metal or an alkaline earth metal.
Claim 11
Dependent Claim
67 words
The toner for development of electrostatic image according to claim 1, wherein said styrene type monomer (a) is styrene, o-methylstyrene or p-methylstyrene; said acrylic acid ester or methacrylic acid ester type monomer (b) is n-butyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate or n-butyl methacrylate; said half ester compound (c) is monoacryloyloxyethyl succinate or monoacryloyloxyethyl phthalate; and said polyvalent metal compound is zinc oxide, magnesium oxide or zinc acetate.
Claim 12
Dependent Claim
49 words
The toner for development of electrostatic image according to claim 1, wherein said styrene type monomer (a) is styrene; said acrylic acid ester or methacrylic acid ester type monomer (b) is n-butyl acrylate; said half ester compound (c) is monoacryloyloxyethyl succinate; and said polyvalent metal compound is zinc oxide.
Claim 13
Dependent Claim
60 words
The toner for development of electrostatic image according to claim 1, wherein the content of said styrene type monomer (a) is 30 to 95% by weight, the content of said acrylic acid or methacrylic acid ester type monomer (b) is 4.5 to 40% by weight and the content of said half ester compound (c) is 0.5 to 30% by weight.
Claim 14
Dependent Claim
33 words
The toner for development of electrostatic image according to claim 1, wherein the content of said polymer component with high molecular weight is 15% by weight or more based on the whole polymer.
Claim 15
Dependent Claim
74 words
The toner for development of electrostatic image according to claim 1, wherein said polyvalent metal compound is used in an amount of 0.1 to 1 mol per mole of the half ester compound, when the polymer is constituted of a polymer component with low molecular weight and a polymer component with high molecular weight consisting of a styrene type monomer (a), a (meth)acrylic acid ester type monomer (b) and a half ester compound (c).
References Cited (Backward Citations)
US4246332A
Cited
US4367275A
Cited
US4600676A
Cited
JPS604946A
Cited
JPS60262169A
Cited
JPS61153661A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-27 | 1993-05-29 | 1993-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-27 | 1997-05-29 | 1997-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-27 | 2001-05-29 | 2001-11-28 | $7700.00 | Window Closed / Lapsed |