发明名称 |
Process for preparing aqueous dispersions of magnetic polymer particles with sharp grain size distribution. |
摘要 |
<p>Process for preparing aqueous dispersions of particles of magnetisable polymer, having a narrow grain size distribution, from aqueous dispersions having a wide grain size distribution, characterised in that: a) the quantity of water of the aqueous dispersion having a wide distribution is adjusted so that the content by weight in particles of magnetisable polymer lies between approximately 1 and 40 % of the said dispersion; b) the concentration in surfactant of the dispersion obtained at stage a) is increased in order to obtain two phases, a so called liquid phase and a so called solid phase; c) the two phases are separated; d) stages a), b) and c) are optionally repeated on the solid phase as many times as necessary; e) the aqueous dispersion having a narrow grain size distribution is recovered. <IMAGE></p> |
申请公布号 |
EP0517987(B1) |
申请公布日期 |
1995.09.13 |
申请号 |
EP19910420195 |
申请日期 |
1991.06.14 |
申请人 |
SOCIETE PROLABO |
发明人 |
BIBETTE, JEROME;SCHORSCH, GILBERT;CHARMOT, DOMINIQUE |
分类号 |
C08F6/04;C08J3/03;C08J3/12;C08L101/00;H01F1/44;(IPC1-7):C08J3/03 |
主分类号 |
C08F6/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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