Patent ID: 7927399
Filing Date: 2011-04-19
Classification: B22F

Abstract:
1. A composition for forming a green body, comprising: powder constituted of a metallic material; and a binder containing a first resin which is decomposable by ozone and a second resin which is substantially non-decomposable by ozone and decomposes later than the first resin by heat, the first resin consisting essentially of at least one of a polylactate-based resin and an aliphatic carbonic ester-based resin, and the second resin consisting essentially of polystyrene, wherein the green body formed of the composition is used in producing a brown body, wherein the brown body is produced by first exposing the green body to a high ozone content atmosphere to decompose the first resin and remove the decomposed first resin, at least once exposing the thus obtained green body to a low ozone content atmosphere whose ozone concentration is lower than an ozone concentration of the high ozone content atmosphere, and heating the thus obtained green body to decompose the second resin and remove the decomposed second resin, and wherein the polystyrene of the second resin has a weight-average molecular weight of 1,000 to 10,000.