Composition for fluororesin powder coating material

A composition for fluororesin powder coating material, which comprises the following particles (1) and the following particles (2), wherein the particles (1) and the particles (2) are different in their curing temperatures by at least 8° C., and the particles (1) and the particles (2) are substantially independently contained:

• The particles (1) are particles for fluororesin powder coating material comprising a fluororesin (A) having hydroxyl groups and a curing agent (α) having a functional group reactive to the hydroxyl groups;
• and the particles (2) are particles for fluororesin powder coating material comprising a fluororesin (A) having hydroxyl groups and a curing agent (α) having a functional group reactive to the hydroxyl groups, wherein the combination of the fluororesin (A) and the curing agent (α) is different from the combination in the particles (1);
• provided that here the curing temperature is meant for a temperature at which the heat generation peak based on the reaction between the functional groups of the curing agent (α) and the hydroxyl groups of the fluororesin (A) starts to rise by the differential scanning calorimetry (DSC) of the particles for fluororesin powder coating material.

A composition for fluororesin powder coating material, which comprises the following particles (3) and the following particles (4), wherein the particles (3) and the particles (4) are different in their curing temperatures by at least 15° C., and the particles (3) and the particles (4) are substantially independently contained:

• The particles (3) are particles comprising a fluororesin (B) having 1,2-epoxy groups and a curing agent (β) capable of curing the fluororesin (B);
• and the particles (4) are particles comprising a fluororesin (B) having 1,2-epoxy groups and a curing agent (β) capable of curing the fluororesin (B), wherein the combination of the fluororesin (B) and the curing agent (β) is different from the combination in the particles (3);
• provided that here the curing temperature is meant for a temperature at which the heat generation peak based on the curing reaction between the curing agent (β) and the fluororesin (B) starts to rise by the differential scanning calorimetry (DSC) of the particles (3) and (4).

A process for producing a composition for fluororesin powder coating material, which comprises preparing the following particles (1) and the following particles (2) independently and then, mixing the particles (1) and the particles (2):

• The particles (1) are particles for fluororesin powder coating material comprising a fluororesin (A) having hydroxyl groups and a curing agent (α) having a functional group reactive to the hydroxyl groups;
• and the particles (2) are particles for fluororesin powder coating material comprising a fluororesin (A) having hydroxyl groups and a curing agent (α) having a functional group reactive to the hydroxyl groups, wherein the combination of the fluororesin (A) and the curing agent (α) is different from the combination in the particles (1);
• provided that here the curing temperature is meant for a temperature at which the heat generation peak based on the reaction between the functional groups of the curing agent (α) and the hydroxyl groups of the fluororesin (A) starts to rise by the differential scanning calorimetry (DSC) of the particles for fluororesin powder coating material.

A process for producing a composition for fluororesin powder coating material, which comprises preparing the following particles (3) and the following particles (4) independently and then, mixing the particles (3) and the particles (4):

• The particles (3) are particles comprising a fluororesin (B) having 1,2-epoxy groups and a curing agent (β) capable of curing the fluororesin (B);
• and the particles (4) are particles comprising a fluororesin (B) having 1,2-epoxy groups and a curing agent (β) capable of curing the fluororesin (B), wherein the combination of the fluororesin (B) and the curing agent (β) is different from the combination in the particles (3);
• provided that here the curing temperature is meant for a temperature at which the heat generation peak based on the curing reaction between the curing agent (β) and the fluororesin (B) starts to rise by the differential scanning calorimetry (DSC) of the particles (3) and (4).