초록 ▼

A structured kaolinitic pigment having improved physical and optical characteristics when incorporated as a filler in paper. The pigment is also useful in paper coating applications. The pigment consists of porous aggregates of kaolin particles which are chemically bonded together. The pigment may b

A structured kaolinitic pigment having improved physical and optical characteristics when incorporated as a filler in paper. The pigment is also useful in paper coating applications. 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 is conducted under conditions such that the kaolinite structure is not impaired.

대표청구항 ▼

A process for producing a structured kaolin pigment having enhanced light scattering and opacifying properties when incorporated in paper; said 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 for

A process for producing a structured kaolin pigment having enhanced light scattering and opacifying properties when incorporated in paper; said 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 MClx, 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.