Process for the preparation of aqueous dispersions of magnetizab

Details Process for the preparation of aqueous dispersions of magnetizab Process for the preparation of aqueous dispersions of magnetizab

1991-07-29

1993-09-07

Nutter, Nathan M.

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...

524556, 524567, 524568, 524571, 524577, 524804, 523205, 523206, 525 541, 526217, 5262923, 526274, 526286, 526287, 526302, 526310, 526311, 5263171, 252 6254, 428402, 428403, 428405, 435176, 435180, 435188, 436527, 530812, 530815, A61K 950, C08F 1202, C08F 244, C08L 8304, C08K 308, B01J 1302, B01J 1312, G01N 33545

Patent

active

052429644

ABSTRACT:
A process for the preparation of aqueous dispersions of magnetizable polymer particles with a narrow distribution from aqueous dispersions with a wide distribution. The amount of water in the aqueous dispersion with a wide distribution is adjusted so that the proportion by weight of magnetizable polymer particles is between about 1 and 40% of said dispersion. The surfactant concentration of the dispersion after the water adjustment is increased until two phases are obtained: a so-called liquid phase and a so-called solid phase. After separation of these two phases is accomplished, these steps are repeated as desired. An aqueous dispersion with a narrow size distribution is recovered.

REFERENCES:
patent: 4177253 (1979-12-01), Davies et al.
patent: 4358388 (1982-11-01), Daniel et al.
patent: 4554088 (1985-11-01), Whitehead et al.
patent: 4952622 (1990-09-01), Chauvel et al.
patent: 5034145 (1991-07-01), Leising et al.

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