Soluble, high clarity starch-based gums

Details Soluble, high clarity starch-based gums Soluble, high clarity starch-based gums

C - Chemistry, Metallurgy

08

B

101/61, 6/63

C08B 31/00 (2006.01) B41N 3/08 (2006.01) C08L 1/00 (2006.01) C09J 103/08 (2006.01)

Patent

CA 1049706

ABSTRACT OF THE DISCLOSURE Granular starch-based gums which are readily soluble in water and which exhibit excellent storage stability and high clarity in aqueous solutions. These gums are useful as replacements for gum arabic, particularly in lithography. They may also be used as emulsifiers and stabilizers in foods, drugs and cosmetics. Additional uses in printing inks, paints, and wherever gum arabic is employed, are also contemplated. They comprise granular high-amylopectin starches which have been thinned (acid-thinned, oxidative-thinned or enzyme-thinned) and which have a degree of substitution of a nonionic substituent from about 0.1 up to about 0.3. "High-amylopectin" starches contain 30% or less amylose. The possible nonionic substituents include alkyl, hydroxyalkyl, cyanoalkyl, amidoalkyl and acyl groups. In addition, carboxyl and amino groups can be used to increase the light sensitivity of the starches in sensitizer film solution applications. Lithographic films of high clarity are made possible by using the starch derivatives of the invention. The starch-based gums of the invention are rendered floc-free or clarified after gelatinization or cooking. The enzyme- clarified gum forms a substantially clear solution when solubilized at pH greater than 5, and the solution remains stable for long periods from 1-12 months.

214973

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