Patent ID: 9487443
Filing Date: 2016-11-08
CPC Classification: A61F,A61L,B28B,B33Y,C04B

Claim Text:
1. A layer stack object formation method, comprising: forming a layer of a powder material that comprises calcium phosphate; and delivering a hardening liquid to a predetermined region of the layer to thereby harden the region, wherein the formation and the hardening are repeated, and wherein 1) or 2) described below is satisfied, 1) the powder material satisfies A) or B) described below, and a hardened product obtained by hardening the powder material has a hydroxyapatite (HAp) transformation rate of 1% or lower, A) an organic compound having phosphate group or carboxyl group is imparted over a surface of a powder of the calcium phosphate, and an imparting amount of the organic compound is 10,000 ppm or lower, and B) the powder material further comprises a powder made of an organic compound having phosphate group or carboxyl group, and a mixing amount of the organic compound relative to a powder of the calcium phosphate is 50% by mass or lower, and 2) the hardening liquid comprises an organic compound having phosphate group or carboxyl group, an acid value of the organic compound is 0.45 gKOH/g or higher, and a content of the organic compound relative to a whole amount of the hardening liquid is 20% by mass or higher.