Method of producing fine particles of organic material and electric twist ball display using the fine particles
First Claim
1. A method of producing fine organic particles having a particle size of 20 μ
- m to 300 μ
m by precipitation in a liquid, said method comprising the steps of;
preparing a precipitation liquid and a raw material solution having an organic raw material dissolved therein; and
injecting a small amount of the raw material solution into the precipitation liquid to granulate fine organic particles in said precipitation liquid;
wherein said raw material solution is prepared by dissolving the organic raw material in a low-boiling point solvent having a lower boiling point than that of said precipitation liquid and having a higher dissolvability for said organic raw material than that of said precipitation liquid.
1 Assignment
0 Petitions
Accused Products
Abstract
A precipitation liquid held under temperature control is stirred at a desired speed in a glass container. A small amount of a raw material solution having an organic raw material dissolved therein is injected into the precipitation liquid by using a syringe or the like to granulate fine organic particles in the precipitation liquid. The raw material solution is prepared by dissolving the organic raw material in a low-boiling point solvent having a lower boiling point than that of the precipitation liquid and having a higher dissolvability for the organic raw material than that of the precipitation liquid. With this method, fine organic particles having a particle size of 20 μm to 300 μm are obtained in the precipitation liquid. Thus, fine organic particles suitable for use in an electric twist ball display can be mass-produced at reduced costs without performing mechanical cutting and abrasion operations.
9 Citations
7 Claims
-
1. A method of producing fine organic particles having a particle size of 20 μ
- m to 300 μ
m by precipitation in a liquid, said method comprising the steps of;
preparing a precipitation liquid and a raw material solution having an organic raw material dissolved therein; and
injecting a small amount of the raw material solution into the precipitation liquid to granulate fine organic particles in said precipitation liquid;
wherein said raw material solution is prepared by dissolving the organic raw material in a low-boiling point solvent having a lower boiling point than that of said precipitation liquid and having a higher dissolvability for said organic raw material than that of said precipitation liquid. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- m to 300 μ
Specification