Kaolin pigment having high brightness and narrow particle...

C - Chemistry – Metallurgy – 09 – C

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C09C 1/42 (2006.01) C04B 14/10 (2006.01) C09C 1/28 (2006.01) D21H 19/40 (2006.01) D21H 21/52 (2006.01)

Patent

CA 2482471

(061)The present invention provides high brightness kaolins exhibiting a Brightness (GE) of at least about 90Ø The hydrous kaolin pigments of the present invention may also have, inter alia, a steepness index (d30/d70 X 100) of at least about 39 and/or a titania concentration less than or equal to about 0.40% by weight of the pigment on a dry basis. (062) The hydrous kaolin pigment is produced by a process comprising: a) forming an aqueous suspension of a hydrous kaolin clay; b) forming a primary product by subjecting the suspension to classification or a combination of classification and griding; c), separating the kaolin from impurities by selective flocculation; and d) defining the separated kaolin. (063) The hydrous kaolins of the present invention allow coated papers to be produced at high brightness while maintaining acidic conditions on a paper machine. The invention pigmets exhibit brightness levels unexpectedly higher, e.g., about 2 to about 2.5 or more (GE) units brighter, than exhibited by previous high brightness hydrous kaolin pigments, without sacrificing other important paper properties. Paper coated with the inventive pigmants have high brightness, high whiteness, and high fluorescence levels. The present invention encompasses these pigments, compositions comprising them, and any application in which they are used.

(061) La présente invention concerne des kaolins de grande brillance ayant une brillance (GE) d'environ 90,0 minimum. Les pigments de kaolin hydratés de la présente invention peuvent notamment avoir un indice de variation de pente (d¿30?/d¿70? X 100) d'environ 39 minimum et/ou une concentration de titane inférieure ou égale à environ 0,40 % en poids du pigment sur une base sèche. (062) Le pigment de kaolin hydraté est obtenu par un procédé consistant : a) à former une suspension aqueuse de kaolinton hydraté; b) à former un produit primaire en soumettant la suspension à une classification ou une combinaison de classification et de broyage ; c), à séparer les impuretés du kaolin par floculation sélective; et d) à définir le kaolin séparé. (063) Les kaolins hydratés de la présente invention permettent de produire des papiers enduits d'une grande brillance tout en conservant les états acides sur la machine à papier. Les pigments selon l'invention ont des niveaux de brillance étonnamment plus élevées, notamment environ de 2 à 2.5 ou plus (GE) unités plus brillantes, que les pigments de kaolin hydratés haute brillance précédents, sans sacrifier d'autres propriétés importantes du papier. Le papier enduit de pigments selon l'invention a une grande brillance, une grande blancheur et de hauts niveaux de fluorescence. La présente invention concerne ces pigments, les compositions les contenant et toute application dans laquelle ils sont utilisés.

LandOfFree

Say what you really think

Search LandOfFree.com for Canadian inventors and patents. Rate them and share your experience with other people.

Rating

Kaolin pigment having high brightness and narrow particle... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Kaolin pigment having high brightness and narrow particle..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Kaolin pigment having high brightness and narrow particle... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFCA-PAI-O-1714025

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.