# US 2008/0187853 A1 · Toner

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- Number: US 2008/0187853 A1
- Document ID: US20080187853A1
- Status: Published application
- Kind: A1
- Application number: 12/056,917
- Filed: 2008-03-27
- Published: 2008-08-07
- Earliest claimed: 2006-10-11
- Assignees: Canon Kabushiki Kaisha
- Inventors: Syuhei Moribe; Katsuhisa Yamazaki; Daisuke Yoshiba; Junko Hirata; Masami Fujimoto; Takashige Kasuya
- Web page: https://patentgrep.com/patent/US20080187853A1

## CPC

- G03G 9/08795: {characterised by their chemical properties, e.g. acidity, molecular weight, sensitivity to reactants}
- G03G 9/08711: {with esters of acrylic or methacrylic acid}
- G03G 9/08755: {Polyesters}
- G03G 9/08793: {Crosslinked polymers}
- G03G 9/08797: {characterised by their physical properties, e.g. viscosity, solubility, melting temperature, softening temperature, glass transition temperature}
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

The present invention aims to provide a toner having excellent developability and excellent low-temperature fixability without causing adhesion of ejected sheets even in a high-speed oilless fixing system and capable of preventing a frameless printing from causing a twisted offseting phenomenon. Specifically, provided is a toner having toner particles including at least a binder resin and a colorant, in which, when the toner is dissolved in a tetrahydrofuran (THF) solvent at 25° C. for 24 hours, the ratio of a THF-soluble matter having an intrinsic viscosity of 5.0×10−2 dl/g or less with respect to the total amount of the THF-soluble matter in a GPC-RALLS-viscometer analysis is 15.0 mass % to 60.0 mass %, and the ratio of a THF-soluble matter having an intrinsic viscosity of 1.5×10−1 dl/g or more with respect to the total amount of the THF-soluble matter in a GPC-RALLS-viscometer analysis is 20.0 mass % to 40.0 mass %.

## Claims

### Claim 1

A toner comprising toner particles comprising at least a binder resin and a colorant,
wherein, when the toner is dissolved in a tetrahydrofuran (THF) solvent at 25° C. for 24 hours, the ratio of a THF-soluble matter having an intrinsic viscosity of 5.0×10−2 dl/g or less with respect to the total amount of the THF-soluble matter in a GPC-RALLS-viscometer analysis is 15.0 mass % to 60.0 mass %, and the ratio of a THF-soluble matter having an intrinsic viscosity of 1.5×10−1 dl/g or more with respect to the total amount of the THF-soluble matter in a GPC-RALLS-viscometer analysis is 20.0 mass % to 40.0 mass %.

### Claim 2 (depends on 1)

A toner according to claim 1, wherein, when the toner is dissolved in a THF solvent at 25° C. for 24 hours, an intrinsic viscosity of a THF-soluble matter having an absolute molecular weight of 1.5×104 in a GPC-RALLS-viscometer analysis is 5.0×10−3 dl/g to 1.0×10−1 dl/g.

### Claim 3 (depends on 1)

A toner according to claim 1, wherein, when the toner is dissolved in a THF solvent at 25° C. for 24 hours, an intrinsic viscosity of a THF-soluble matter having an absolute molecular weight of 1.0×105 in a GPC-RALLS-viscometer analysis is 1.0×10−1 dl/g to 2.0×10−1 dl/g.

### Claim 4 (depends on 1)

A toner according to claim 1, wherein, when the toner is dissolved in a THF solvent at 25° C. for 24 hours, an intrinsic viscosity of a THF-soluble matter having an absolute molecular weight of 1.5×104 in a GPC-RALLS-viscometer analysis is 1.0×10−2 dl/g to 6.0×10−2 dl/g.

### Claim 5 (depends on 1)

A toner according to claim 1, wherein, when the toner is dissolved in a THF solvent at 25° C. for 24 hours, an intrinsic viscosity of a THF-soluble matter having an absolute molecular weight of 1.0×105 in a GPC-RALLS-viscometer analysis is 1.2×10−1 dl/g to 2.0×10−1 dl/g.

### Claim 6 (depends on 1)

A toner according to claim 1, wherein the binder resin comprise at least a hybrid resin in which a polyester unit and a vinyl copolymerization unit are chemically bound.