| 摘要 |
The invention relates to a method for producing surface-modified inorganic fillers or pigments of a desired particle size. Said method is characterized in that filler or pigment slurries of inorganic fillers or pigments are milled to the desired particle size under the action of compressive and shear forces using polymer dispersions, whereby the fillers and/or pigments are additionally brought into contact with conventional milling auxiliary agents and/or dispersants (active agent) in a quantity of between 0.1 and 2.0 wt. %, in relation to the fillers or pigments. The invention also relates to the fillers and pigments that are obtained by said method and to their use for producing dispersion inks, adhesives, coatings or coating compounds for the paper industry, in particular coating compounds used in various industry segments, such as sheet fed offset printing, roll offset printing, gravure printing and for the production of cardboard and special papers. |
| 主权项 |
1. A process for making paper or cardboard, comprising applying a slurry comprising a surface modified inorganic pigment selected from calcium carbonate, precipitated calcium carbonate, china clay, and talcum_as a component of the coat in paper making, the process further comprising the step of preparing the slurry by a process comprising the steps of:
milling the pigment to a grain size distribution of from 10 to 95% by weight of particles of <1 μm, based on the equivalent diameter; and coating the pigment while milling with a binder composition comprising a polymer dispersion and a dispersing agent, wherein: (a) the polymer dispersion comprises an unmodified polymer particle selected from natural rubber, synthetic rubber, polyurethane, styrene/butadiene, styrene/acrylic acid or acrylate ester, styrene/butadiene/acrylic acid or acrylate ester, and vinyl acetate/acrylic acid or acrylate ester, in a solids amount of from 5 to 15% by weight, based on said pigment; and (b) the dispersing agent is present in an amount of 0.1 to 2.0% by weight, based on the pigment;
whereby the polymer particle is rubbed onto the pigment to form a film. |
