Stability improvement of amorphous particle dispersions

Details Stability improvement of amorphous particle dispersions Stability improvement of amorphous particle dispersions

1990-12-17

1992-05-05

Lusignan, Michael

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Antihalation or filter layer containing

264 5, 428402, 430510, 430931, G03C 1815, G03C 1825

Patent

active

051107171

ABSTRACT:
An object of the invention is to overcome disadvantages of prior practices. A further object of the invention is to provide a process for providing particles that result in improved UV absorption in photographic products.
An additional object is to provide lower cost polymer particle dispersions.
The invention is generally accomplished by mechanically grinding a crystalline material to a desired particle size in a liquid that is not a solvent for the material, heating said crystalline particles dispersed in said liquid to above their melting temperature, and cooling the melted particles in said liquid to form amorphous particles. In preferred forms of the invention, the material is a photographically useful material, such as ultraviolet light absorber or coupler.

REFERENCES:
patent: 2747996 (1956-05-01), Edgerton et al.
patent: 3676139 (1972-07-01), Amano et al.
patent: 4518686 (1983-05-01), Sasaki et al.
patent: 4587346 (1986-05-01), Winter et al.
patent: 4749643 (1988-06-01), Ohlschlager et al.
patent: 4865957 (1989-09-01), Sakai et al.
patent: 4948718 (1990-08-01), Factor et al.

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