Recording material support, process for manufacturing the same, recording material and process for image formation

A process for manufacturing a recording material support comprising the steps of:

• applying a coating solution on a surface of raw paper of the recording material support where a image-forming layer is provided;
• and
• performing a calender treatment on the raw paper after the step of applying,
• wherein the recording material comprises the raw paper, and the coating solution comprises a surface-treating agent at least one selected from a soap-free latex and a soap-free emulsion.

A recording material comprising:

• a recording material support which comprises raw paper;
• and
• an image-forming layer which is provided at least one surface of the recording material support,
• wherein the recording material satisfies at least one of the following conditions (i) to (iii):
• (i) Cobb size (30 seconds) of a surface of the recording material support where an image-forming layer is provided, is 10 g/m2 or less;
• (ii) Oken type smoothness of a surface of the recording material support where an image-forming layer is provided, is 210 seconds or more, and Stökigt sizing degree thereof is 100 seconds or more;
• (iii) Central square average roughness (SRa) measured at a cutoff of 5 mm to 6 mm on a surface of the recording material support where an image-forming layer is provided, is 0.7 μm or less, and variation [ΔSRa;(SRa before contacting water)−(SRa after contacting water)] of the SRa before and after the surface thereof is brought into contact with water at 20° C. for 2 minutes, is in the range of −0.1 μm to +0.1 μm.

A process for image formation comprises the steps of:

• forming a toner image on a electrophotographic image-receiving material;
• heating and pressurizing a surface of the electrophotographic image-receiving material where the toner image is formed on, using a fixing belt and a fixing roller;
• cooling the electrophotographic image-receiving material in which the toner image is fixed thereon;
• and
• separating the electrophotographic image-receiving material from the fixing belt,
• wherein the electrophotographic image-receiving material comprises:
• a support;
• and
• a toner image-receiving layer on at least one surface of the support,
• and the electrophotographic image-receiving material satisfied at least one of the following conditions (i) to (iii):
• (i) Cobb size (30 seconds) of a surface of the recording material support where an image-forming layer is provided, is 10 g/m2 or less;
• (ii) Oken type smoothness of a surface of the recording material support where an-image-forming layer is provided, is 210 seconds or more, and Stökigt sizing degree thereof is 100 seconds or more;
• (iii) Central square average roughness (SRa) measured at a cutoff of 5 mm to 6 mm on a surface of the recording material support where an image-forming layer is provided, is 0.7 μm or less, and variation [ΔSRa;(SRa before contacting water)−(SRa after contacting water)] of the SRa before and after the surface thereof is brought into contact with water at 20° C. for 2 minutes, is in the range of −0.1 μm to +0.1 μm.