Method for producing three-dimensional shaped article

A method for producing a three-dimensional shaped article in which the three-dimensional shaped article is produced by stacking layers, the method comprising:

• forming a first layer out of the layers by using a first composition that contains a constituent material powder, a first powder, and a binder which constitute the three-dimensional shaped article;
• forming a second layer out of the layers by using a second composition that is different from the first composition and contains a second powder and a binder so that the second layer is in contact with the first layer;
• removing at least a part of the first powder, the binder of the first layer, and the binder of the second layer by heating a stack containing the first layer and the second layer;
• and
• sintering the constituent material powder by heating the stack containing the first layer and the second layer,
• wherein the first powder and the second powder are both resin materials,
• a decomposition point of the first powder is higher than decomposition points of the binder of the first layer and the binder of the second layer,
• a decomposition point of the second powder is higher than the decomposition point of the first powder,
• a sintering temperature of the constituent material powder is higher than the decomposition point of the second powder,
• the first composition and the second composition are solids at room temperature,
• in the forming of the first layer, the first layer is formed by heating the first composition that includes each of the constituent material powder, the first powder, and the binder to a fluid state and performing injection, and
• in the forming of the second layer, the second layer is formed by heating the second composition that includes each of the second powder and the binder to a fluid state and performing injection.