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A coated paper of improved optical and printing qualities, coated with a structured kaolinitic pigment. The pigment consists of porous aggregates of kaolin particles which are chemically bonded together. The pigment may be produced by chemically reacting a particulate kaolin with a metal chloride, s

A coated paper of improved optical and printing qualities, coated with a structured kaolinitic pigment. The pigment consists of porous aggregates of kaolin particles which are chemically bonded together. The pigment may be produced by chemically reacting a particulate kaolin with a metal chloride, such as silicon tetrachloride. The process for preparing the structured pigment is conducted under conditions such that the kaolinite structure is not impaired.

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A method for producing improved coated papers and paperboard products which comprises: A. producing a structured kaolin pigment having enhanced light scattering and opacifying properties by a process comprising the steps of: (a) forming a feed mixture of a fine particle size kaolin; and (b) chemical

A method for producing improved coated papers and paperboard products which comprises: A. producing a structured kaolin pigment having enhanced light scattering and opacifying properties by a process comprising the steps of: (a) forming a feed mixture of a fine particle size kaolin; and (b) chemically reacting said feed mixture in particulate form with a metal chloride having the general formula M Clx, where M is Si, Al or Ti; and x is 3 or 4 in accordance with M, to aggregate the kaolin particles to form the structured pigment; the moisture level present in the said feed mixture reacted in step (b) being sufficient to at least partially hydrolyze the metal chloride; and steps (a) and (b) being conducted under conditions such that the basic kaolinite crystalline structure is not altered; and B. coating the said paper or paperboard product with a coating composition having a pigment component wherein said structured kaolin pigment comprises from 5 to 60% by weight thereof.