 Material for imparting non-stick and non-wetting properties |
| We claim: 1. A material system for imparting improved abrasion resistance, non-stick and non-... |
|
| Coated film |
| OF THE INVENTION The present invention will be described in detail below. The polyester ... |
|
| Method for preparing novel fluorinated organosiloxane copolymers |
| OF THE INVENTION The resinous benzene-soluble organosiloxane copolymers prepared using the present ... |
|
| Nonlinear optical materials and process for producing the same |
| The present invention provides a third-order nonlinear optical material comprising a film which is ... |
|
| Polyurethane foam articles coated with a crushed foam and method of producing |
| What is claimed is: 1. An article of manufacture comprising a polyurethane foam coated with a ... |
|
| Decorative hollow vitreous article and method of making same |
| I claim: 1. A method of making a hollow vitreous article with a decorative pattern, comprising the ... |
|
| Web of record assemblies |
| The invention is directed to a composite web of record assemblies in which the above mentioned ... |
|
| Label |
| This invention relates to labels and more particularly to labels to be stuck on to cans, bottles, ... |
|
| Resealable container labels |
| What I claim is: 1. A label for affixing to a container comprising a longitudinal strip of paper ... |
|
| Label |
| The present invention relates to a label in which the sheet does not require to be die-cut prior to ... |
|
|
Use of mixture of high molecular weight sulfonates as auxiliary dispersant for structured kaolins
| Details |
Inventors: Nemeh, Saad; Sennett, Paul; Slepetys, Richard A.;
Assignee: Engelhard Corporation (Menlo Park, NJ)
Primary Examiner: Lieberman; Paul
Assistant Examiner: Kirschner; Helene
Attorney, Agent or Firm: Moselle; Inez L.
A heat stabilized slurry of bulked kaolin pigment is prepared by mixing a small but effective amount of a water-soluble cationic material such as a cationic polyelectrolyte flocculant with a kaolin clay pigment in the presence of water. The resultant bulked clay product is dispersed to form a high solids clay-water slurry useful in making aqueous coating colors suitable for manufacturing lightweight coated publication papers or the pigment can be used as a filler for paper webs. Slurries having stable viscosity during storage at elevated temperature and improved resistance to the formation of sediment are prepared by using as the dispersant a combination of an anionic lignosulfonate and an anionic naphthalene sulfonate formaldehyde complex in combination with a polyacrylate salt. |
|
DETAILED DESCRIPTION Preparation of Preferred Bulked Pigments (Ser.
No.
861,943).
It has been determined that the shape of the particle size distribution curve of the kaolin clay used to produce pigments of the invention has an effect on the ultimate coating properties of the polyelectrolyte treated kaolin clay mineral.
Thus, a clay having the following particle size distribution characteristics has been found to provide minimum viscosity and good coating properties: a median particle size of 0.
55 micrometers and a particle size distribution such that about 88.
+-.
3% of the particles have an equivalent spherical diameter less than about 2 micrometers and not more than about 25% by weight, preferably not more than about 20% by weight, have an equivalent spherical diameter less than 0.
3 micrometers.
If the particle size is too coarse, gloss and opacity suffer although opacity will be greater than that obtained with the clay before treatment with polyelectrolyte.
If the quantity of ultrafine particles, i.
e.
, particles 0.
3 micrometers and finer, is too great, the print quality of paper coated with such pigment is impaired and the viscosity of slurries of the pigment may be such that the product has limited, if any, use.
In order to achieve the desired particle size distribution of the kaolin that is eventually formed into a bulked structure, it is generally necessary to perform one or more particle size separations on the crude clay.
Generally, such processing includes degritting, followed by differential gravitational or centrifugal sedimentation to recover a size fraction of desired particle size, such as for example, a fraction that is 90% by weight finer than 2 micrometers and does not contain an excessive amount of ultrafine particles.
The content of ultrafines and median (weight) particle size of such fraction will vary, depending on the particle size distribution of the crude clay.
In order to perform these operations successfully, it is essential that the clay be present in the form of discrete particles in water rather than flocs so that the particles can be accurately separated into different size ranges
|
|
Manufacturing Materials 
