Paper, cardboard or paperboard-like material and a process for its production

A process for the manufacture of a paper, cardboard or paperboard material containing inorganic fibers, inorganic particulate additives and organic binder or flocculating agents, wherein

• (A) the particulate inorganic additives constitute 40 to 80% by weight of the dry matter of the material, the inorganic particulate additives are composed of
• (i) 35-75% by weight of the dry matter of the material of a base filler selected from the group consisting of SiO.sub.2, kaolin, aluminum oxide, fuller's earth, calcium carbonate and gypsum, of which 35 to 99% by weight have a particle size of <2 .mu.m and not more than 10% by weight have a particle size of >20 .mu.m, and
• (ii) 1 to 15% by weight of the dry matter of the material of an anionic flocculating active pigment of which at least 50% by weight have a primary particle size of <2 .mu.m, selected from the group consisting of aluminum hydroxide, bentonite and colloidal amorphous SiO.sub.2, and
• (B) the organic flocculating agent is a cationic polymeric carbohydrate with an average molecular weight of 100,000 to 2,000,000 and a degree of substitution of 0.01 to 0.3 and is present in a quantity of 0.5 to 6% by weight, based on the dry matter of the material,
• 1000 g of base filler being unable to bind more than 0.1 mMol and 1000 g of anionic flocculating active pigment being able to bind at least 0.1 mMol cationic carbohydrate under flocculation prior to the attachment to the inorganic fiber, and
• comprising mixing an aqueous dispersion of said inorganic fibers and said particulate inorganic base fillers (i) with an aqueous suspension of said active pigment (ii), thereafter adding said cationic polymeric carbohydrate (B) to said mixture shortly before shaping, and shaping said mixture.