Process for preparation of monodispersed crystalline particles from amorphous polymers
US4378228A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 4, 1977 |
| Grant date | Mar 29, 1983 |
| Priority date | — |
| Expiry date | Apr 4, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2333/12
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Process for preparation of monodispersed crystalline particles from amorphous crystallizable polymers. In this process, an amorphous polymer of an inorganic glass, such as selenium, or of organic polymer, such as a polyester, is initially contacted with a crystal inducing fluid under certain specified conditions. Concurrent with such contact the crystallizable polymer is subjected to physical and/or ultrasonic forces. This combination of steps results in the substantially complete conversion of the amorphous polymer to monodispersed crystalline particles. In the case of crystallization of amorphous selenium, this process is directive for preparation of the corresponding triclinic crystalline form of this material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.