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Treatment of clay mineral pigment
| Details |
Inventors: Malden, Peter James;
Assignee: English Clays Lovering Pochin & Company, Limited (Austin, GB2)
Primary Examiner: Lieberman; Allan
Assistant Examiner:
Attorney, Agent or Firm: Armstrong, Nikaido, Marmelstein & Kubovcik
The invention provides a process for improving the rheological properties of an aqueous suspension of a clay mineral in which the aqueous suspension is mixed with a water-soluble organic compound having a plurality of basic groups and a number average molecular weight not greater than 1,000. The treated clay minerals may be used, for example, as the pigment in a paper coating composition. |
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DETAILED DESCRIPTION What is claimed is: 1.
A process for reducing the viscosity at a given solids content of an aqueous suspension of a clay mineral for use as a pigment in a paper coating composition, which process consists essentially of the step of mixing an aqueous suspension of the clay mineral at a solids content in the range of from 5 to 30% by weight and at a pH of from 4.
5 to 6.
0 with from 0.
05 to 0.
25% by weight of a water-soluble compound having a plurality of basic groups and a number average molecular weight not greater than 1000 selected from the group consisting of polyethylene imine, ethylene diamine, 1:12 dodecane diamine, diethylene triamine, tetraethylene pentamine, and hexamethylene tetramine.
2.
A process according to claim 1 wherein the water-soluble compound is mixed with the aqueous suspension of the clay mineral in the form of a dilute aqueous solution.
3.
A process according to claim 1, wherein said solids content is in the range of from 10 to 20% by weight.
4.
A process according to claim 2, wherein the pH of said dilute aqueous solution is adjusted to a value in the range of from 4.
5 to 6.
0 prior to being mixed with the aqueous suspension of the clay mineral.
5.
A process according to claim 1, wherein the clay mineral is a clay of the kandite group.
6.
A process according to claim 1, wherein the clay mineral is a clay of the smectite group.
7.
A process according to claim 1, wherein the clay mineral is an illite.
8.
A process according to claim 5, wherein the clay mineral is a kaolin.
9.
A process according to claim 2, wherein the water-soluble compound has a number average molecular weight of from 500 to 1,000, and wherein said aqueous solution contains from 0.
1 to 20% by weight of the water-soluble compound per volume of solution.
10.
A process according to claim 9, wherein said aqueous solution contains from 0.
5 to 5% by weight of said water-soluble compound per volume of solution.
11.
A process according to claim 1, wherein the clay mineral, after being mixed with the water-soluble compound, is subjected to mechanical working in the plastic state
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Adhesives and Rubbers 
