Production of dispersions of fine powders
AssigneeBasic Incorporated
InventorsGlenn C. Vickery, Donald M. Mozynski
Life of this patent
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Abstract
A process for preparing a high solids paste dispersion of fine particle size solid material in a vehicle which comprises premixing the solid material with the vehicle and a deagglomerating agent. The proportions of solid material, vehicle and deagglomerating agent are such that the premix remains a dry discrete flowable powder. The premix is then passed through a colloid mill which converts the powder to a paste dispersion in the form of a coherent mass in one pass through the mill.
Claims18
A process for preparing a high solids paste dispersion of fine particle size solid material in a vehicle which comprises premixing solid material with a liquid vehicle and a surface active agent, the proportions of solid material, vehicles and surface active agent being such as to produce a discrete flowable powder,
- and passing said discrete flowable powder through a colloid mill to convert the same to a paste dispersion in the form of a coherent mass.
A process for preparing a high solids paste dispersion of magnesium oxide in a vehicle suitable for polymer compounding, comprising the steps of
- processing said magnesium oxide to an average particle size of about 0.02-1 microns;
- premixing said magnesium oxide with a mineral oil having a viscosity between about 1,000 and about 6,000 Saybolt Universal seconds at 100.degree. F and with a surface active agent;
- said premix comprising in percentages by weight about 65-75% magnesium oxide, about 2-5% surface active agent, the remainder mineral oil, and being in the form of a discrete flowable powder, and
- passing said premix through a colloid mill having a gap setting of about 0.010-0.025 inches to convert the powder to a paste dispersion in the form of a coherent mass.
A process for preparing a paste dispersion of calcium oxide or zinc oxide in a vehicle suitable for polymer compounding comprising the steps of
- processing said calcium oxide or zinc oxide to an average particle size of about 1-2 microns;
- mixing said calcium oxide or zinc oxide with a mineral oil having a viscosity between about 1,000 and about 6,000 Saybolt Universal seconds at 100.degree. F and with a surface active agent;
- said mixture comprising in percentages by weight about 75-90% calcium oxide or zinc oxide, about 1-3% surface active agent, the remainder mineral oil, and being in the form of a discrete flowable powder;
- and passing said mixture through a colloid mill having a gap setting of about 0.010-0.025 inches to convert the powder to a paste dispersion in the form of a coherent mass.
Dependencies are inferred from the claim text.