US4833057A
Expired / Lapsed
US
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Toner composition for the electrophotography
Assignee: Mitsui Chemicals Inc
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Filing: 1987-01-30
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Granted: 1989-05-23
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Expires: 2007-01-30
Abstract
Abstract PCT No. PCT/JP87/00064 Sec. 371 Date Sep. 22, 1987 Sec. 102(e) Date Sep. 22, 1987 PCT Filed Jan. 30, 1987 PCT Pub. No. WO87/04811 PCT Pub. Date Aug. 13, 1987.Disclosed is a toner composition for the electrophotography, which comprises as a main component a urethane-modified polyester resin obtained by reacting a polyester resin with an isocyanate compound, in which the mole-equivalent ratio between the hydroxyl group of the polyester resin and the isocyanate group of the isocyanate compound is within a specific range and the glass transition temperature of the obtained resin is within a specific range. This composition has a good fixing property at a low temperature and a good offset resistance at a high temperature, and this composition is especially excellent in the form of a mixture with a polymer having a relatively low molecular weight.
Inventors
- 👤 Akira Misawa
- 👤 Hisatomo Sato
- 👤 Keiichi Ishikawa
- 👤 Masaaki Shin
- 👤 Akio Fujiwara
- 👤 Kazuo Hisamatsu
- 👤 Shoji Kawasaki
- 👤 Kenji Uchiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:19
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08742; G03G9/08764; G03G9/08755
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
71 words
A heat-fixable toner composition for the electrophotography, which comprises as a main component a urethane-modified polyester resin (C) obtained by reacting a polyester resin (A) having a number average molecular weight of 6000 to 15000 with an isocyanate compound (B) in an amount of 0.05 to 0.95 mole-equivalent per mole of the hydroxyl group of the polyester resin, said resin (C) having a glass transition temperature of 40° to 80° C.
Claim 2
Dependent Claim
71 words
A heat-fixable toner composition for the electrophotography, which comprises as a main component a urethane-modified polyester resin (C) obtained by reacting a polyester resin (A) having a number average molecular weight of 6000 to 15000 with an isocyanate compound (B) in an amount of 0.05 to 0.95 mole-equivalent per mole of the hydroxyl group of the polyester resin, said resin (C) having a glass transition temperature of 40° to 80° C.
Claim 3
Dependent Claim
38 words
A toner composition for the electrophotography according to claim 1, wherein the isocyanate compound (B) comprises a diisocyanate compound in an amount of 0.3 to 0.95 mole-equivalent per mole of the hydroxyl group of the polyester resin (A).
Claim 4
Dependent Claim
119 words
A heat-fixable toner composition for the electrophotography, which comprises as a main component a resin mixture (E) comprising a urethane-modified polyester resin (C) obtained by reacting a polyester resin (A) having a number average molecular weight of 1000 to 15000 with an isocyanate compound (B) in an amount of 0.05 to 0.95 mole-equivalent per mole of the hydroxyl group of the polyester resin (A), said resin (C) having a glass transition temperature of 40° to 80° C., and a polymer (D) having a number average molecular weight of 1000 to 10000, the (C)/(D) weight ratio being in the range of from 30/70 to 95/5 and the glass transition temperature of said resin mixture (E) being 40° to 80° C.
Claim 5
Dependent Claim
119 words
A heat-fixable toner composition for the electrophotography, which comprises as a main component a resin mixture (E) comprising a urethane-modified polyester resin (C) obtained by reacting a polyester resin (A) having a number average molecular weight of 1000 to 15000 with an isocyanate compound (B) in an amount of 0.05 to 0.95 mole-equivalent per mole of the hydroxyl group of the polyester resin (A), said resin (C) having a glass transition temperature of 40° to 80° C., and a polymer (D) having a number average molecular weight of 1000 to 10000, the (C)/(D) weight ratio being in the range of from 30/70 to 95/5 and the glass transition temperature of said resin mixture (E) being 40° to 80° C.
Claim 6
Dependent Claim
28 words
A toner composition for the electrophotography according to claim 3, wherein the polymer (D) is a polyester resin having a number average molecular weight of 1000 to 5000.
Claim 7
Dependent Claim
36 words
A toner composition for the electrophotography according to claim 4, wherein the polymer (D) is a condensate of a propylene oxide adduct of bisphenol A with an aromatic dibasic acid and/or a lower alkyl ester thereof.
Claim 8
Dependent Claim
28 words
A toner composition for the electrophotography according to claim 3, wherein the polymer (D) is a vinyl copolymer having a number average molecular weight of 2000 to 10000.
Claim 9
Dependent Claim
26 words
A toner composition for the electrophotography according to claim 6, wherein the vinyl copolymer is a copolymer of styrene with an aliphatic unsaturated carboxylic acid ester.
Claim 10
Dependent Claim
41 words
A toner composition for the electrophotography according to claim 1, wherein the isocyanate compound (B) comprises a trifunctional to hexafunctional polyisocyanate compound in an amount of 0.05 to 0.3 mole-equivalent per mole of the hydroxyl group of the polyester resin (A).
Claim 11
Dependent Claim
41 words
A toner composition for the electrophotography according to claim 3, wherein the isocyanate compound (B) comprises a trifunctional to hexafunctional polyisocyanate compound in an amount of 0.05 to 0.3 mole-equivalent per mole of the hydroxyl group of the polyester resin (A).
References Cited (Backward Citations)
JPS59159173A
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US4576890A
Cited
US4542165A
Cited
JPS60263950A
Cited
US4717738A
Cited
JPH06186760A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-22 | 1992-11-21 | 1993-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-22 | 1996-11-21 | 1997-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-22 | 2000-11-21 | 2001-05-23 | $7700.00 | Window Closed / Lapsed |