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Media milling

  • US 6,604,698 B2
  • Filed: 05/10/2001
  • Issued: 08/12/2003
  • Est. Priority Date: 05/10/2000
  • Status: Expired due to Term
First Claim
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1. A process for preparing a dispersion of solid particles of a milled substrate in a fluid carrier comprising the steps of:

  • (a) providing a plurality of large size milling media to the milling chamber of a media mill and forming a depth filter therefrom on an exit screen or separator in the milling chamber;

    (b) adding to said milling chamber a plurality of small size milling media optionally containing additional large size milling media, a conglomerate of a solid substance comprising a substrate to be milled and optionally one or more than one surface active substance, and a fluid carrier;

    (c) milling said conglomerate in said milling chamber to produce very small milled substrate product particles; and

    (d) continuously removing or separating said milled substrate particles suspended in said fluid carrier from the media through said depth filter;

    wherein;

    the exit screen or separator comprises openings of size S0;

    the large size media have a size distribution S1 of which all are larger than S0;

    the small size media have a size distribution S2 which are smaller than S0;

    the very small milled substrate particles have a size distribution S3 and are smaller than all of the small media; and

    the large size media and the small size media are retained in the milling chamber.

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