Production of fine spherical thermoplastic resin particles
US7947369B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 25, 2006 |
| Grant date | May 24, 2011 |
| Priority date | — |
| Expiry date | Feb 28, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2998
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Fine spherical thermoplastic resin particles are produced by preparing a resin composition including a matrix of a water-soluble material, and fine particles of a water-insoluble thermoplastic resin dispersed in the matrix, the fine particles and the matrix each being melted or softened in the resin composition; cooling and solidifying the resin composition under such conditions that the resin composition does not undergo deformation due to stress; and removing the water-soluble material by washing with water to thereby yield fine spherical particles containing the water-insoluble thermoplastic resin. This method has wide applicability, applies less loads on the environment, does not require special devices, can be easily conducted, and can efficiently produce such particles. The resulting particles are highly spherical.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.