High performance paper filler and method of producing same
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jul 24, 1990
Grant Date -
N/A
app pub date -
May 23, 1988
filing date -
May 23, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A high bulking kaolin pigment is provided which exhibits improved opacifying efficiency as a paper filler. The kaolin pigment comprises an uncalcined clay composition consisting essentially of kaolin particles which have not only been treated with an amine, but also upon which aluminum hydroxide has been precipitated, and, of which less than about 20% by weight have a particle size less than 0.3 microns in equivalent spherical dimeter. Further, a method is provided for producing the pigment from a hydrated kaolin clay having a brightness of at least about 89. The selected starting clay is dispersed in water and subjected as a slurry to delamination, defining, surface treatment with an amine and aluminum sulfate, and leaching. The treated kaolin slurry is subsequently rinsed and filtered to a produce a filter cake which is redispersed to yield a commercial paper filler.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully