Opacifying kaolin pigments and process for making same

Details Opacifying kaolin pigments and process for making same Opacifying kaolin pigments and process for making same

C - Chemistry, Metallurgy

01

B

23/186, 6/212

C01B 33/26 (2006.01) C04B 14/10 (2006.01) C09C 1/42 (2006.01) D21H 17/68 (2006.01) D21H 19/40 (2006.01)

Patent

CA 2030780

An opacifying pigment with enhanced light scattering properties for use as a paper coating or filler material is produced by reacting kaolin in the presence of water with sodium hydroxide or potassium hydroxide at a temperature in excess of 60°C. The kaolin is reacted with the hydroxide in a concentration to produce a molality of at least 0.1.

Divulgation d'un procédé de production d'un pigment opacifiant qui se distingue par des propriétés améliorées de dispersion de la lumière et qui est utilisé comme couchage du papier ou agent de charge. Le procédé consiste à faire réagir du kaolin dans une solution aqueuse d'hydroxyde de sodium ou de potassium à une température supérieure à 60 degrés C. Le kaolin réagit avec l'hydroxyde dans une concentration pour produire une molalité d'au moins 0,1.

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