Electrophotography member, fixation device, and electrophotographic image formation device

Abstract

Provided is an electrophotography member that makes it possible to achieve high image gloss and favorable image quality while improving the wear resistance of a surface layer with respect to sheets of paper. An electrophotography member according to the present invention has a base layer and a surface layer. The surface layer includes a methylpentene polymer. When the temperature of a sample taken from the surface layer is raised and lowered twice between 25°C and 270°C for DSC measurement and the points for 160°C and 250°C for the first time the temperature is raised for a first DSC measurement are connected by a straight line, the melt endotherm of the sample as found using the straight line as a baseline at least 24 J / g.

Claims

1. An electrophotographic component having at least a base layer and a surface layer, wherein the surface layer contains a methylpentene polymer, and a sample taken from the surface layer is used as the measurement sample to perform calorimetry using a differential scanning calorimeter (DSC) by sequentially performing the following steps (1) to (4): Step (1): A first heating step in which the measurement sample is heated from 25°C to 270°C at a heating rate of 20°C / min; Step (2): A first cooling step in which the measurement sample heated to 270°C in step (1) is cooled to 25°C at a cooling rate of 20°C / min; Step (3): A second heating step in which the measurement sample, which was heated to 25°C in step (2), is heated to 270°C at a heating rate of 20°C / min; Step (4): A second cooling step in which the measurement sample heated to 270°C in step (3) is cooled to 25°C at a cooling rate of 20°C / min; An electrophotographic component characterized in that the first DSC heating curve obtained in step (1) is represented by curve A, which shows the relationship between heat flow [W / g] per unit weight and time, two points, the time at 160°C and the time at 250°C, are connected by a straight line, this straight line is used as the baseline, and when curve A is further corrected by the baseline to obtain curve B, the amount of heat absorbed by the measured sample corresponding to the area value of the region enclosed by curve B and the baseline is 24 J / g or more.

2. The electrophotographic member according to claim 1, wherein the amount of heat absorbed by melting is 31 J / g or more.

3. The electrophotographic member according to claim 1 or 2, wherein the amount of heat absorbed by melting is 34 J / g or less.

4. The electrophotographic member according to any one of claims 1 to 3, wherein the curve B obtained by baseline correction of the first DSC heating curve obtained in step (1) has at least two peaks, and when the two peaks located on the high-temperature side are selected in order from the largest of the at least two peaks, the peak located on the low-temperature side is denoted as P1, and the peak top temperature of P1 is T1°C, and the curve B2 obtained by baseline correction of the second DSC heating curve obtained in step (3) has at least one peak, and when the peak top temperature of the largest of the at least one peaks in curve B2 is denoted as T2, T1 and T2 satisfy the following formula (1).

5. The electrophotographic member according to claim 4, wherein, at the time corresponding to the highest temperature peak of curve B, the negative portion of curve C, which is the differential curve of curve B, has at least two peaks.

6. The electrophotographic member according to claim 4 or 5, wherein T1 and T2 satisfy the following formula (2): 0.3°C ≤ T1 - T2 ≤ 6°C ... (2) 7. The electrophotographic member according to any one of claims 1 to 6, wherein the electrophotographic member is an electrophotographic belt having an endless shape.

8. The electrophotographic member according to any one of claims 1 to 7, wherein the thickness of the surface layer is 7 to 100 μm.

9. The electrophotographic member according to any one of claims 1 to 8, wherein the electrophotographic member is a pressure roller.

10. The electrophotographic member according to any one of claims 1 to 8, wherein the electrophotographic member is a fixing belt.

11. A fixing apparatus for an electrophotographic image forming apparatus, the fixing apparatus comprising a fixing member and a pressurizing member disposed opposite to the fixing member, wherein at least one of the fixing member and the pressurizing member is an electrophotographic member according to any one of claims 1 to 8.

12. An electrophotographic image forming apparatus comprising a fixing device, wherein the fixing device comprises a fixing member and a pressurizing member disposed opposite to the fixing member, and at least one of the fixing member and the pressurizing member is an electrophotographic member according to any one of claims 1 to 8.

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