Process for preparation of monodispersed crystalline particles f

Details Process for preparation of monodispersed crystalline particles f Process for preparation of monodispersed crystalline particles f

1977-04-04

1983-03-29

Bernstein, Hiram H.

Chemistry: physical processes

Physical processes

Crystallization

423510, 524611, 524565, 524601, B01D 900

Patent

active

043782280

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.

REFERENCES:
patent: 3432514 (1969-03-01), Cash et al.
patent: 3931082 (1976-01-01), Cruz et al.
patent: 4289874 (1981-09-01), Bockrath
Journal of Applied Polymer Science, V26 1795-1811, 1981, Jameel.
Translation of p. 411-414, V16 No. 6 of Slvtskin et al. Zhvrnal Navchnoi i prikladnoi fotogratii i kinematogratii.
Zingaro et al. Selenium Van Nostrand Reinhold 10 N.Y. pp. 125-133, 1974.
Saunder J. Phys. Chem. 4, 423 (1900), pp. 462-469.

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