EP0312691A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Polyester resin for toner and process for its production
Assignee: Mitsubishi Chemical Corp
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Filing: 1988-05-30
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Granted: —
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Expires: 2008-05-30
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 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%. 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).
Inventors
- 👤 Ryo Funato
- 👤 Shinji Kubo
- 👤 Noriyuki Tajiri
- 👤 Hirokazu Ito
- 👤 Hitoshi Iwasaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 07:18
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
117 words
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 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
117 words
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 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
16 words
The polyester resin according to Claim 1, wherein the softening temperature is from 110 to 160°C.
Claim 5
Dependent Claim
18 words
The polyester resin according to Claim 1, wherein the glass transition temperature (Tg) is from 55 to 70°C.
Claim 6
Dependent Claim
192 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 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 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: 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 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 7
Dependent Claim
192 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 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 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: 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 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 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
15 words
The process according to Claim 5, wherein the softening temperature is from 110 to 160°C.
Claim 10
Dependent Claim
17 words
The process according to Claim 5, wherein the glass transition temperature (Tg) is from 55 to 70°C.
References Cited (Backward Citations)
No citation records indexed.
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