Method of improving dispersibility of anionic cellulose ethers
AssigneeHercules Incorporated
InventorThomas G. Majewicz
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Abstract
Easily dispersible anionic water-soluble polymers are disclosed which are prepared by lightly treating particulate water-soluble polymer with a water-soluble aluminum salt and an aluminum chelant. Rate of hydration is retarded when the particles are added to aqueous media, allowing the particles to be dispersed completely before their surfaces hydrate sufficiently to gel and prevent complete dissolution.
Claims4
In the method of preparing aqueous solutions of anionic water-soluble polymers wherein particulate anionic water-soluble polymer is treated with aluminum ion to delay its hydration in aqueous systems, the improvement which comprises dissolving said treated polymer particles in the presence of about 2 to 25% by weight, based on polymer weight, of an aluminum chelant.
In the method of preparing aqueous solutions of carboxymethyl cellulose wherein particulate carboxymethyl cellulose is treated with aluminum ion to delay its hydration in aqueous systems, the improvement which comprises dissolving said treated carboxymethyl cellulose in the presence of about 2 to 25% by weight, based on polymer weight, of an aluminum chelant selected from the class consisting of sodium hexamethylphosphate, sodium citrate, and the sodium salt of ethylenediamine tetraacetic acid.
Dependencies are inferred from the claim text.