Process for the preparation of colloidal manganese dioxide

Details Process for the preparation of colloidal manganese dioxide Process for the preparation of colloidal manganese dioxide

1991-03-20

1993-12-07

Michl, Paul R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524430, C08K 320

Patent

active

052684083

ABSTRACT:
This invention relates to the preparation of antihalation layers for photographic film. The invention is an improved process for the preparation of colloidal manganese dioxide dispersions adapted for use in antihalation layers, the process comprising adding a reducing agent to an aqueous solution comprising a water soluble permanganate salt and a dispersing agent, the improvement wherein said dispersing agent is a water soluble polymer selected from the group consisting of water soluble carboxylated acrylic polymers, water soluble styrene/acrylic copolymers, and water soluble alpha-methyl styrene/acrylic copolymers.

REFERENCES:
patent: 3567452 (1971-03-01), Rawlins, Jr.
patent: 3630739 (1971-12-01), Hine
patent: 3755186 (1973-08-01), Hine
patent: 3773539 (1973-11-01), Sato et al.
patent: 3869402 (1975-03-01), Mackey et al.
patent: 3984247 (1976-10-01), Nakamura et al.
World Patents Index, Week 7448, Derwent Publications, Ltd., London, GB, AN 74-83710V and JP-B-49 040 865 (Japanese Geon Co. Ltd.) Jun. 11, 1974 (abstract).

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