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公开(公告)号：DE3929052A1
公开(公告)日：1991-03-07
申请号：DE3929052
申请日：1989-09-01
Applicant: BASF AG
Inventor： FOLLMANN HEINRICH , HOFFMANN DIETRICH , SLIWKA WOLFGANG DR
Abstract: A process for the preparation of spherical, hard, mono- or oligodisperse particles having a diameter of from 0.1 to 100 mu m, by condensation of partially etherified melamine-formaldehyde precondensates which are infinitely soluble in water to give a clear solution, in an aqueous solution of a water-soluble polymer which carries highly acidic groups and has a K value of from 100 to 160, at pH 3 to 6 and at from 20 to 100 DEG C, and condensing the resultant turbid solution until the precondensate has been consumed, giving a dispersion of the particles. The dispersion is neutralised. The particles can be used in the form of the aqueous dispersion or after isolation from the dispersion. … The particles are spherical, hard, non-swellable particles which can be used, for example, as sizes for plastics, polishes, flatting (matting) agents, extruders and/or as pigments. … The process allows the targeted preparation of particles of a prespecified size and particle size distribution.
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公开(公告)号：ES2063218T3
公开(公告)日：1995-01-01
申请号：ES90116196
申请日：1990-08-24
Applicant: BASF AG
Inventor： FOLLMANN HEINRICH , HOFFMANN DIETRICH , SLIWKA WOLFGANG DR
Abstract: A process for the preparation of spherical, hard, mono- or oligodisperse particles having a diameter of from 0.1 to 100 mu m, by condensation of partially etherified melamine-formaldehyde precondensates which are infinitely soluble in water to give a clear solution, in an aqueous solution of a water-soluble polymer which carries highly acidic groups and has a K value of from 100 to 160, at pH 3 to 6 and at from 20 to 100 DEG C, and condensing the resultant turbid solution until the precondensate has been consumed, giving a dispersion of the particles. The dispersion is neutralised. The particles can be used in the form of the aqueous dispersion or after isolation from the dispersion. … The particles are spherical, hard, non-swellable particles which can be used, for example, as sizes for plastics, polishes, flatting (matting) agents, extruders and/or as pigments. … The process allows the targeted preparation of particles of a prespecified size and particle size distribution.
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公开(公告)号：DE59007616D1
公开(公告)日：1994-12-08
申请号：DE59007616
申请日：1990-08-24
Applicant: BASF AG
Inventor： FOLLMANN HEINRICH , HOFFMANN DIETRICH , SLIWKA WOLFGANG DR
Abstract: A process for the preparation of spherical, hard, mono- or oligodisperse particles having a diameter of from 0.1 to 100 mu m, by condensation of partially etherified melamine-formaldehyde precondensates which are infinitely soluble in water to give a clear solution, in an aqueous solution of a water-soluble polymer which carries highly acidic groups and has a K value of from 100 to 160, at pH 3 to 6 and at from 20 to 100 DEG C, and condensing the resultant turbid solution until the precondensate has been consumed, giving a dispersion of the particles. The dispersion is neutralised. The particles can be used in the form of the aqueous dispersion or after isolation from the dispersion. … The particles are spherical, hard, non-swellable particles which can be used, for example, as sizes for plastics, polishes, flatting (matting) agents, extruders and/or as pigments. … The process allows the targeted preparation of particles of a prespecified size and particle size distribution.
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公开(公告)号：DE3935111A1
公开(公告)日：1991-06-27
申请号：DE3935111
申请日：1989-10-21
Applicant: BASF AG
Inventor： FOLLMANN HEINRICH , HOFFMANN DIETRICH , SLIWKA WOLFGANG DR
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