Stable suspensions of carboxymethyl cellulose and their preparation
AssigneePhillips Petroleum Company
InventorsMarshall D. Bishop, Robert M. Parlman
Life of this patent
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Abstract
Carboxymethyl cellulose (CMC) with a moisture content in the range of 12 to 25 weight percent water can be formulated with hydrocarbon oils, anionic surfactants and suspending agents to provide stable suspensions. The suspended CMC does not tend to settle out and/or compact during extended periods of storage.
Claims9
A stable suspension comprising (A) a hydrocarbon oil, (B) at least one anionic surfactant, (C) hydrophobic fumed silica and (D) hydrated carboxymethyl cellulose wherein said carboxymethyl cellulose has a moisture content of 12 to 25 weight percent water.
A process for stabilizing suspensions of carboxymethyl cellulose comprising:
- (a) hydrating said carboxymethyl cellulose to a moisture content of from 12 to 25 weight percent;
- and
- (b) mixing said hydrated carboxymethyl cellulose with a hydrocarbon oil, an anionic surfactant, and hydrophobic fumed silica.
Dependencies are inferred from the claim text.