The invention discloses a method of producing a filler composition to be used in paper or board production, said method comprising providing a suspension comprising calcium hydroxide and performing carbonation of the calcium hydroxide to form precipitated calcium carbonate (PCC). The invention is characterized in that starch and/or carboxy methyl cellulose (CMC) is added to the suspension during said carbonation of calcium hydroxide. The method of the invention enables an increased filler content in paper or paperboard without substantially increasing the dusting tendency or decreasing the strength of the paper or board.

Process for the surface treatment of a titanium dioxide pigment, characterized in that it comprises the following steps: an aqueous suspension of titanium dioxide pigments is formed, in a first step, a layer of alumina phosphate is precipitated on the surface of the pigment, in a second step, a layer of alumina is precipitated over the first layer of alumina phosphate, and in a third step, a layer of magnesium oxide and alumina is precipitated on the layer of alumina. Also included are titanium dioxide pigments made by the disclosed process and method using said pigments in paper manufacturing.

Process for the surface treatment of a titanium dioxide pigment, characterized in that it comprises the following steps: an aqueous suspension of titanium dioxide pigments is formed, in a first step, a layer of alumina phosphate is precipitated on the surface of the pigment, in a second step, a layer of alumina is precipitated over the first layer of alumina phosphate, and in a third step, a layer of magnesium oxide and alumina is precipitated on the layer of alumina. Also included are titanium dioxide pigments made by the disclosed process and method using said pigments in paper manufacturing.

Methods for making paper with improved strength and methods for improving paper strength, using a metal chelate and an organic polymer, and improved strength paper made through these processes.

Methods for making paper with improved strength and methods for improving paper strength, using a metal chelate and an organic polymer, and improved strength paper made through these processes.

The present invention concerns a process for the preparation of flocculated filler particles, wherein at least two aqueous suspensions of at least one filler material and at least one flocculating additive are combined.

The present invention concerns a process for the preparation of flocculated filler particles, wherein at least two aqueous suspensions of at least one filler material and at least one flocculating additive are combined.

A composition in accordance with an aspect of the present invention includes: composite fibers composed of inorganic particles and fibers; and at least one of (i) different-type inorganic particles which are different in type from the inorganic particles, (ii) different-type fibers which are different in type from the fibers, and (iii) organic particles.

Some embodiments of the invention include a process for the surface-treatment of a calcium carbonate-comprising material, a surface-treated calcium carbonate-comprising material obtained by such a process and the use of such a surface-treated calcium carbonate-comprising material.

Some embodiments of the invention include a process for the surface-treatment of a calcium carbonate-comprising material, a surface-treated calcium carbonate-comprising material obtained by such a process and the use of such a surface-treated calcium carbonate-comprising material.