Polymer stabilizers
AssigneeGAF Corporation
InventorsEarl P. Williams, Donald H. Lorenz
Life of this patent
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Abstract
Polymer thickeners having a viscosity of at least 10 K, employed in acid media are stabilized with Redox indicators having from 6 to 30 carbon atoms, such as, for example, methylene blue, phenosafranine, pyronine Y, tartrazine, amaranth, methyl orange, an alkali metal salt of diphenylamine sulfonate and malachite green oxalate, which stabilizers are combined with the polymer in a concentration of between about 0.005 to about 1 weight %.
Claims19
A mucilage composition having a pH less than 7 containing between about 0.5 and about 25 weight % of a vinyl polymer thickener having a K value of between about 10 and about 250 and between about 0.005 and about 1 weight %, based on polymer, of a redox indicator having from 6 to 30 carbon atoms and containing at least one radical selected from the group consisting of amino, cyano and azo, to stabilize said polymer against acidic degradation.
Dependencies are inferred from the claim text.