Patent US5037715A successfully refreshed from Google Patents.
US5037715A
Expired / Lapsed
US
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Resins for toner of electrophotography and method for manufacturing the same
Assignee: Mitsui Chemicals Inc
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Filing: 1990-06-11
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Granted: 1991-08-06
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Expires: 2010-06-11
Abstract
Abstract A resin for toner of electrophotography comprises a urethane-modified polyester resin (D) having a glass transition temperature ranging from 40 DEG to 75 DEG C., which is obtained by reacting a resin mixture composed of a polyester resin (A) having a number-averaging molecular weight of 1,000 to 15,000 and a hydroxyl value of 10 to 100 and a polyester resin (B) having a number-average molecular weight ranging from 1,000 to 5,000 and a sum of acid value and hydroxyl value of less than 10, in a weight ratio of (A)/(B) ranging from 20:80 to 60:40, with 0.3 to 0.99 molar equivalent of an isocyanate compound (C) per one molar equivalent of hydroxyl group of the polyester resin (A). The resin for toner is excellent in grindability and storage stability and it provides toners for electrophotography having good anti-blocking properties and good fixing properties whereby good images free of fogging can be obtained.
Inventors
- 👤 Kazuo Hagiwara
- 👤 Akira Misawa
- 👤 Kazuo Hisamatsu
- 👤 Masaaki Shin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:57
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/4202; G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08742; G03G9/08764
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
117 words
A resin for toner of electrophotography which comprises a urethane-modified polyester resin (D) having a glass transition temperature ranging from 40° to 75° C., which is obtained by reacting a resin mixture composed of a polyester resin (A) having a number-average molecular weight of 1,000 to 15,000 and a hydroxyl value of 10 to 100 and a polyester resin (B) having a number-average molecular weight ranging from 1,000 to 5,000 and a sum of acid value and hydroxyl value of less than 10, in a weight ratio of (A)/(B) ranging from 20:80 to 60:40, with 0.3 to 0.99 molar equivalent of an isocyanate compound (C) per one molar equivalent of hydroxyl group of the polyester resin (A).
Claim 2
Dependent Claim
117 words
A resin for toner of electrophotography which comprises a urethane-modified polyester resin (D) having a glass transition temperature ranging from 40° to 75° C., which is obtained by reacting a resin mixture composed of a polyester resin (A) having a number-average molecular weight of 1,000 to 15,000 and a hydroxyl value of 10 to 100 and a polyester resin (B) having a number-average molecular weight ranging from 1,000 to 5,000 and a sum of acid value and hydroxyl value of less than 10, in a weight ratio of (A)/(B) ranging from 20:80 to 60:40, with 0.3 to 0.99 molar equivalent of an isocyanate compound (C) per one molar equivalent of hydroxyl group of the polyester resin (A).
Claim 3
Dependent Claim
22 words
The resin of claim 1 wherein the polyester resin (A) is one obtained by polycondensation of a polycarboxylic acid and polyhydric alcohol.
Claim 4
Dependent Claim
24 words
The resin of claim 2 wherein the polycarboxylic acid is an aliphatic dibasic acid, an aromatic dibasic acid or a lower alkyl ester thereof.
Claim 5
Dependent Claim
15 words
The resin of claim 2 wherein the polyhydric alcohol is a bisphenol A-propylene oxide adduct.
Claim 6
Dependent Claim
21 words
The resin of claim 1 wherein the number average molecular weight of the polyester resin (B) ranges from 2,000 to 4,000.
Claim 7
Dependent Claim
25 words
The resin of claim 1 wherein the sum of the acid value and the hydroxyl value of the polyester resin (B) is less than 8.
Claim 8
Dependent Claim
36 words
The resin of claim 1 wherein it is obtained by reacting the isocyanate compound (C) in an amount ranging from 0.5 to 0.95 molar equivalent per molar equivalent of hydroxyl group of the polyester resin (A).
Claim 9
Dependent Claim
11 words
A toner composition for electrophotography comprising the resin of claim 1.
Claim 10
Dependent Claim
22 words
The resin of claim 1 wherein the polyester resin (B) is obtained by polycondensation of a polycarboxylic acid and a polyhydric alcohol.
Claim 11
Dependent Claim
24 words
The resin of claim 9 wherein the polycarboxylic acid is an aliphatic dibasic acid, an aromatic dibasic acid or a lower alkyl ester thereof.
Claim 12
Dependent Claim
15 words
The resin of claim 9 wherein the polyhydric alcohol is a bisphenol A-propylene oxide adduct.
References Cited (Backward Citations)
EP0004811A2
Cited
US4833057A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-08-05 | 1995-02-04 | 1995-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-05 | 1999-02-04 | 1999-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-05 | 2003-02-04 | 2003-08-06 | $7700.00 | Window Closed / Lapsed |