US4804610A
Expired / Lapsed
US
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Process for producing toner by suspension polymerization method
Assignee: Canon Inc
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Filing: 1987-05-13
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Granted: 1989-02-14
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Expires: 2007-05-13
Abstract
Abstract A process for preparing a toner obtained by a suspension polymerization method comprises stirring a mixture containing at least a polymerizable monomer containing 5 to 500 ppm of a polymerization inhibitor dissolved in the polymerizable monomer and a colorant; preparing a polymerizable monomer composition by adding a polymerization initiator to said mixture; stirring the prepared polymerizable monomer composition; and carrying out suspension polymerization of the polymerizable monomer composition dispersed in an aqueous medium.
Inventors
- 👤 Hiromi Mori
- 👤 Satoshi Matsunaga
- 👤 Kuniko Kobayashi
- 👤 Yoshihiko Hyosu
- 👤 Eiichi Imai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:12
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/44; G; G03; G03G; G03G9/00; G03G9/08; G03G9/0802; G03G9/0804; G03G9/0806
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
73 words
A process for preparing a toner obtained by a suspension polymerization method, comprising: stirring a mixture containing at least a polymerizable monomer containing 5 to 500 ppm of a polymerization inhibitor dissolved in the polymerizable monomer and a colorant; preparing a polymerizable monomer composition by adding a polymerization initiator to said mixture; stirring the prepared polymerizable monomer composition; and carrying out suspension polymerization of the polymerizable monomer composition dispersed in an aqueous medium.
Claim 2
Dependent Claim
73 words
A process for preparing a toner obtained by a suspension polymerization method, comprising: stirring a mixture containing at least a polymerizable monomer containing 5 to 500 ppm of a polymerization inhibitor dissolved in the polymerizable monomer and a colorant; preparing a polymerizable monomer composition by adding a polymerization initiator to said mixture; stirring the prepared polymerizable monomer composition; and carrying out suspension polymerization of the polymerizable monomer composition dispersed in an aqueous medium.
Claim 3
Dependent Claim
14 words
A process according to claim 1, wherein the polymerizable monomer is a vinyl monomer.
Claim 4
Dependent Claim
18 words
A process according to claim 2, wherein the polymerizable monomer comprises styrene monomer and an acrylic acid ester.
Claim 5
Dependent Claim
18 words
A process according to claim 2, wherein the polymerizable monomer comprises styrene monomer and a methacrylic acid ester.
Claim 6
Dependent Claim
17 words
A process according to claim 1, wherein 5 to 200 ppm of the polymerization inhibitor is contained.
Claim 7
Dependent Claim
17 words
A process according to claim 5, wherein 5 to 150 ppm of the polymerization inhibitor is contained.
Claim 8
Dependent Claim
14 words
A process according to claim 5, wherein the polymerization inhibitor is a polyhydroxy compound.
Claim 9
Dependent Claim
12 words
A process according to claim 7, wherein the polymerization inhibitor is p-tertiary-butylcatechol.
Claim 10
Dependent Claim
18 words
A process according to claim 7, wherein the polymerization inhibitor is hydroquinone monomethyl ether or hydroquinone monoethyl ether.
Claim 11
Dependent Claim
20 words
A process according to claim 1, wherein the polymerization initiator is 2,2'-azobis(2,4-dimethylvaleronitrile), dimethyl-2,2'-azobisisobutyrate, or a mixture of 2,2'-azobis(2,4-dimethyl-valeronitrile) and dimethyl-2,2'-azobisisobutyrate.
Claim 12
Dependent Claim
16 words
A process according to claim 1, wherein the colorant is carbon black or a magnetic material.
Claim 13
Dependent Claim
19 words
A process according to claim 1, wherein the polymerizable monomer composition contains a polar polymer or a cyclized rubber.
Claim 14
Dependent Claim
15 words
A process according to claim 1, wherein the polymerizable monomer composition contains a crosslinking agent.
Claim 15
Dependent Claim
31 words
A process according to claim 1, wherein the aqueous medium is used in an amount of 300 to 3000 parts by weight per 100 parts by weight of the polymerizable monomer.
Claim 16
Dependent Claim
21 words
A process according to claim 14, wherein the aqueous medium contains an inorganic dispersing agent which is difficulty soluble in water.
Claim 17
Dependent Claim
43 words
A process according to claim 1, wherein the polymerizable monomer composition contains a polar polymer or a cyclized rubber and the aqueous medium contains a difficulty water-soluble inorganic dispersing agent of the polarity opposite to that of said polar polymer or cyclized rubber.
Claim 18
Dependent Claim
12 words
A process according to claim 7, wherein the polymerization initiator is hydroquinone.
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) | 1992-02-14 | 1992-08-15 | 1993-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-14 | 1996-08-15 | 1997-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-14 | 2000-08-15 | 2001-02-14 | $7700.00 | Window Closed / Lapsed |