# US 5,702,859 A · Electrophotographic toner and process for the production thereof

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- Number: US 5,702,859 A
- Document ID: US5702859A
- Status: Granted
- Kind: A
- Application number: 08/647,744
- Filed: 1996-05-15
- Granted: 1997-12-30
- Earliest claimed: 1995-05-16
- Assignees: Tomoegawa Paper Co., Ltd.
- Inventors: Hideyuki Kubota
- Web page: https://patentgrep.com/patent/US5702859A

## CPC

- G03G 9/08711: {with esters of acrylic or methacrylic acid}
- C08F 2/44: Polymerisation in the presence of compounding ingredients, e.g. plasticisers, dyestuffs, fillers
- G03G 9/0806: {whereby chemical synthesis of at least one of the toner components takes place}
- G03G 9/081: {by mixing the toner components in a liquefied state; melt kneading; reactive mixing}
- G03G 9/08782: {Waxes}
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## Abstract

An electrophotographic toner which can be fixed at a low fixing temperature, causes no practical problem on offsetting-free properties and has excellent fixing strength to a transfer sheet, and a process for the production thereof, the toner containing a binder resin and a colorant as main components and further containing a Fischer-Tropsch wax formed from natural gas and/or a Fischer-Tropsch wax formed from coal and having a melt viscosity, measured at 110.degree. C., of 1.times.10.sup.5 to 1.times.10.sup.6 poise, the process comprising solution-polymrerizing, suspension-polymerizing or emulsion-polymerizing a vinyl-containing monomer in which the Fischer-Tropsch wax formed from natural gas and/or a Fischer-Tropsch wax formed from coal are/is dissolved in advance, to prepare the binder resin.

## Claims

### Claim 1

An electrophotographic toner containing a binder resin and a colorant as main components, the toner further containing a Fischer-Tropsch wax formed from natural gas and having a melting point, measured with a differential scanning calorimeter, of 85.degree. to 100.degree. C.

### Claim 2 (depends on 1)

An electrophotographic toner according to claim 1, wherein the Fischer-Tropsch wax formed from natural gas has a penetration rate of 2 or less at 25.degree. C.

### Claim 3 (depends on 1)

An electrophotographic toner according to claim 1, wherein the electrophotographic toner contains 1 to 20% by weight, based on the total weight thereof, of the Fischer-Tropsch wax formed from natural gas.

### Claim 4

An electrophotographic toner containing a binder resin and a colorant as main components, the toner further containing a Fischer-Tropsch wax formed from natural gas and having a melt viscosity, measured at 110.degree. C., of 1.times.10.sup.5 to 1.times.10.sup.6 poise.

### Claim 5 (depends on 4)

An electrophotographic toner according to claim 4, wherein the Fischer-Tropsch wax formed from natural gas has a melting point, measured with a differential scanning calorimeter, of 85.degree. to 100.degree. C.

### Claim 6 (depends on 4)

An electrophotographic toner according to claim 4, wherein the Fischer-Tropsch wax formed from natural gas has a penetration rate of 2 or less at 25.degree. C.

### Claim 7

An electrophotographic toner containing a binder resin and a colorant as main components, the toner containing a Fischer-Tropsch wax formed from natural gas, the binder resin being a styrene/(meth)acrylate copolymer, the toner showing two maximal values when measured by GPC, one maximal value being at least 8.times.10.sup.5, the other being in the range of from 3,000 to 10,000.

### Claim 8 (depends on 7)

An electrophotographic toner according to claim 7, wherein the Fischer-Tropsch wax formed from natural gas has a melting point, measured with a differential scanning calorimeter, of 85.degree. to 100.degree. C.

### Claim 9 (depends on 7)

An electrophotographic toner according to claim 7, wherein the Fischer-Tropsch wax formed from natural gas have a penetration rate of 2 or less at 25.degree. C.

### Claim 10 (depends on 7)

An electrophotographic toner according to claim 7, wherein the electrophotographic toner contains 20% by weight or less, based on the electrophotographic toner, of the styrene/(meth)acrylate copolymer having a molecular weight maximal value of at least 8.times.10.sup.5.

### Claim 11

An electrophotographic toner containing a binder resin and a colorant as main components, the binder resin containing a vinyl-containing copolymer formed by polymerization in the presence of a Fischer-Tropsch wax formed from natural gas.