PURPOSE: To prevent removal of a constitutional powder body from compound powder body and to prevent decrease of fluidity of the compound powder body by constituting the compound powder body of a spherical core body, a powder body layer formed on the external peripheral surface of the core body, and a resin film layer formed on the external peripheral surface of the powder body layer.
CONSTITUTION: Spherical powder bodies 1 are mixed with powder bodies 4 of a pigment, etc., in dry state and the mixture is stirred. In this stage, a powder body layer 2 is formed by sticking the powder body 4 to the core body 1 by the frictional electricity generated in the core body 1. After sticking resin powder 5 to the external peripheral surface of the powder body layer 2 formed on the spherical core body 1, the material is transformed to microcapsules by transforming the resin powder on the external peripheral surface of the powder body layer 2 to a resin film layer 3, thus a compound powder body is obtd. In order to stick the resin powder 5 to the external peripheral surface of the powder body layer 2, spherical core bodies 1 having the powder body layer 2 formed thereon are mixed with the resin powder 5 in the dry state.
KAWASE SUSUMU
KOISHI MASUMI
| JPS5946125A | 1984-03-15 |