Patent US4849495A successfully refreshed from Google Patents.
US4849495A
Expired / Lapsed
US
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Polyester resin from tri- or higher polycarboxylic acid for toner and process for its production
Assignee: Mitsubishi Chemical Corp
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Filing: 1988-05-31
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Granted: 1989-07-18
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Expires: 2008-05-31
Abstract
Abstract A polyester resin for toner, which consists essentially of (a) from 5 to 60 equivalent %, based on the entire carboxylic acid components, of at least one member selected from the group consisting of tribasic and higher polybasic carboxylic acids, anhydrides thereof and lower alkyl esters thereof, (b) at least one member selected from the group consisting of dicarboxylic acids and lower alkyl esters thereof, (c) at least one aromatic diol and (d) at least one aliphatic diol, and which has a softening temeprature of from 100° to 170° C., a glass transition temperature (Tg) of from 50° to 70° C., an acid value of from 0.5 to 10 mgKOH/g and a gel content of from 3 to 40%.
Inventors
- 👤 Ryo Funato
- 👤 Shinji Kubo
- 👤 Noriyuki Tajiri
- 👤 Hirokazu Ito
- 👤 Hitoshi Iwasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:01
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/20; G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08742; G03G9/08755
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
125 words
A polyester resin for toner, which consists essentially of the polyester condensation reaction product of (a) from 5 to 60 equivalent %, based on the entire carboxylic acid components, of at least one member selected from the group consisting of tricarboxylic and higher poly carboxylic acids, anhydrides thereof and lower alkyl esters thereof, (b) at least one member selected from the group consisting of dicarboxylic acids and lower alkyl esters thereof, (c) at least one aromatic diol and (d) at least one aliphatic diol, and which has a softening temperature of from 100° to 170° C., a glass transition temperature (Tg) of from 50° to 70° C., an acid value of from 0.5 to 10 mgKOH/g and a gel content of from 3 to 40%.
Claim 2
Dependent Claim
125 words
A polyester resin for toner, which consists essentially of the polyester condensation reaction product of (a) from 5 to 60 equivalent %, based on the entire carboxylic acid components, of at least one member selected from the group consisting of tricarboxylic and higher poly carboxylic acids, anhydrides thereof and lower alkyl esters thereof, (b) at least one member selected from the group consisting of dicarboxylic acids and lower alkyl esters thereof, (c) at least one aromatic diol and (d) at least one aliphatic diol, and which has a softening temperature of from 100° to 170° C., a glass transition temperature (Tg) of from 50° to 70° C., an acid value of from 0.5 to 10 mgKOH/g and a gel content of from 3 to 40%.
Claim 3
Dependent Claim
32 words
The polyester resin according to claim 1, wherein the component (a) is in an amount of from 5 to 35 equivalent %, based on the entire carboxylic acid components (a) and (b).
Claim 4
Dependent Claim
17 words
The polyester resin according to claim 1, wherein the softening temperature is from 110° to 160° C.
Claim 5
Dependent Claim
19 words
The polyester resin according to claim 1, wherein the glass transition temperature (Tg) is from 55° to 70° C.
Claim 6
Dependent Claim
195 words
A process for producing a polyester resin for toner by the condensation reaction of (a) from 5 to 60 equivalent % based on the entire carboxylic acid components, of at least one member selected from the group consisting of tri and higher poly carboxylic acids, anhydrides thereof and lower alkyl esters thereof, (b) at least one member selected from the group consisting of dicarboxylic acids and lower alkyl esters thereof, (c) at least one aromatic diol and (d) at least one aliphatic diol in the presence of a catalyst, which comprises reacting the carboxylic acid components (a) and (b) with the diol components (c) and (d) for esterification or ester interchange under a condition to satisfy the formula 4>Y>0.8(1+x) (I) where followed by crosslinking while distillating off the diol components under a reduced pressure of at most 150 mmHg, then substantially terminating the crosslinking reaction by raising the pressure of the reaction system, to obtain a polyester resin having a softening temperature of from to 170° C., a glass transition temperature (Tg) of from to 70° C., an acid value of from 0.5 to 10 mgKOH/g and a gel content of from 3 to 40%.
Claim 7
Dependent Claim
195 words
A process for producing a polyester resin for toner by the condensation reaction of (a) from 5 to 60 equivalent % based on the entire carboxylic acid components, of at least one member selected from the group consisting of tri and higher poly carboxylic acids, anhydrides thereof and lower alkyl esters thereof, (b) at least one member selected from the group consisting of dicarboxylic acids and lower alkyl esters thereof, (c) at least one aromatic diol and (d) at least one aliphatic diol in the presence of a catalyst, which comprises reacting the carboxylic acid components (a) and (b) with the diol components (c) and (d) for esterification or ester interchange under a condition to satisfy the formula 4>Y>0.8(1+x) (I) where followed by crosslinking while distillating off the diol components under a reduced pressure of at most 150 mmHg, then substantially terminating the crosslinking reaction by raising the pressure of the reaction system, to obtain a polyester resin having a softening temperature of from to 170° C., a glass transition temperature (Tg) of from to 70° C., an acid value of from 0.5 to 10 mgKOH/g and a gel content of from 3 to 40%.
Claim 8
Dependent Claim
31 words
The process according to claim 5, wherein the component (a) is in an amount of from 5 to 35 equivalent %, based on the entire carboxylic acid components (a) and (b).
Claim 9
Dependent Claim
16 words
The process according to claim 5, wherein the softening temperature is from 110° to 160° C.
Claim 10
Dependent Claim
18 words
The process according to claim 5, wherein the glass transition temperature (Tg) is from 55° to 70° C.
References Cited (Backward Citations)
US4387211A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-17 | 1993-01-16 | 1993-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-17 | 1997-01-16 | 1997-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-17 | 2001-01-16 | 2001-07-18 | $7700.00 | Window Closed / Lapsed |