POLYESTER RESIN FOR TONER, METHOD FOR PRODUCING SAME AND TONER
First Claim
1. A polyester resin for toner (1) with a peak molecular weight of at least 12,000 in gel permeation chromatography and containing an unsaturated double bond.
1 Assignment
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Accused Products
Abstract
Disclosed is a toner which is excellent in low-temperature fixability, high-temperature offset resistance, storage stability and durability, while having a wide range of fixing temperature. Also disclosed is a polyester resin used for such a toner. The polyester resin is one of the following polyester resin (A)-(E) for toners. (A) A polyester resin for toners having an Mp as determined by GPC of not less than 12,000 and having an unsaturated double bond (B) A polyester resin for toners obtained by crosslinking the polyester resin (A) (C) A polyester resin for toners containing the polyester resin (A) and another polyester resin having an Mp as determined by GPC of less than 12,000 (D) A polyester resin for toners obtained by crosslinking the polyester resin (C) (E) A polyester resin for toners containing a THF soluble fraction and a THF insoluble fraction wherein the Mw/Mn of the THF soluble fraction is not less than 6 and the total of the acid value and the hydroxyl value of the THF insoluble fraction is not more than 40 mgKOH/g.
20 Citations
7 Claims
- 1. A polyester resin for toner (1) with a peak molecular weight of at least 12,000 in gel permeation chromatography and containing an unsaturated double bond.
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2. A polyester resin for toner obtained by crosslinking reaction of polyester resin for toner (1) with a peak molecular weight of at least 12,000 in gel permeation chromatography and containing an unsaturated double bond.
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3. A polyester resin for toner comprising polyester resin for toner (1) with a peak molecular weight of at least 12,000 in gel permeation chromatography and containing an unsaturated double bond, and polyester resin for toner (2) with a peak molecular weight of less than 12,000 in gel permeation chromatography.
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4. A polyester resin for toner obtained by crosslinking reaction of a polyester resin for toner comprising polyester resin for toner (1) with a peak molecular weight of at least 12,000 in gel permeation chromatography and containing an unsaturated double bond, and polyester resin for toner (2) with a peak molecular weight of less than 12,000 in gel permeation chromatography.
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5. A polyester resin for toner comprising a THF-soluble fraction and a THF-insoluble fraction, wherein the ratio of the mass-average molecular weight (Mw)/number-average molecular weight (Mn) (Mw/Mn) of the THF-soluble fraction is 6 or greater and the sum of the acid value and hydroxyl value of the THF-insoluble fraction is no greater than 40 mgKOH/g.
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7. A process for production of a polyester resin for toner comprising blending and crosslinking polyester resin for toner (1) with a peak molecular weight of at least 12,000 in gel permeation chromatography and containing an unsaturated double bond, and polyester resin for toner (2) with a peak molecular weight of less than 12,000 in gel permeation chromatography.
Specification