Patent ID: 11926931
Assignee: RICOH COMPANY, LTD.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC D  B  C  Y | IPC B  C  D

Claim 2:
3. The resin powder according to claim 1, satisfying at least one of the following relations (1) to (3):

Tmf1>Tmf2 and (Tmf1−Tmf2)≥3 degrees C.,  (1):, where Tmf1 represents a melting starting temperature of an endothermic peak as the resin powder is heated to a temperature 30 degrees C. higher than a melting point of the resin powder at a temperature rising speed of 10 degrees C. per minute for a first time and Tmf2 represents a melting starting temperature of an endothermic peak as the resin powder is heated for the first time, cooled down to −30 degrees C. or lower at a temperature falling speed of 10 degrees C. per minute, and heated to the temperature 30 degrees C. higher than the melting point at a temperature rising speed of 10 degrees C. per minute for a second time, and both Tmf1 and Tmf2 are measured in differential scanning calorimetry measuring according to ISO 3146, wherein the melting starting temperature of the endothermic peak represents a temperature at a point −15 mW lower from a straight line parallel to X axis drawn from a site where quantity of heat becomes constant after endotherm at the melting point is finished to a lower temperature side,

Cd1>Cd2 and (Cd1−Cd2)≥3 percent,  (2):, where Cd1 represents a crystallinity obtained from an energy amount of the endothermic peak when the resin powder is heated to a temperature 30 degrees C. higher than the melting point of the resin powder at a temperature rising speed of 10 degrees C. per minute for a first time and Cd2 represents a crystallinity obtained from an energy amount of the endothermic peak as the resin powder is heated for the first time, cooled down to −30 degrees C. or lower at a temperature falling speed of 10 degrees C. per minute, and heated to the temperature 30 degrees C. higher than the melting point at a temperature rising speed of 10 degrees C. per minute for a second time, and both Cd1 and Cd2 are measured in differential scanning calorimetry measuring according to ISO 3146, and

C×1>C×2 and (C×1−C×2)≥3 percent,  (3):, where C×1 represents a crystallinity of the resin powder obtained by X-ray diffraction measuring and C×2 represents a crystallinity obtained by X-ray diffraction measuring as the resin powder is heated to the temperature 30 degrees C. higher than the melting point thereof at a temperature rising speed of 10 degrees C. per minute, cooled down to −30 degrees C. or lower at a temperature falling speed of 10 degrees C. per minute, and thereafter heated to the temperature 30 degrees C. higher than the melting point at a temperature rising speed of 10 degrees C. per minute in nitrogen atmosphere.