The Production of High Molecular Weight Water Soluble Acids by the INSERT Ion-Exchange Method.

Due to the fact that the old method of producing high molecular weight water soluble acids from certain natural gums had proved uneconomical, both from a high cost of production and low purity, a new method of producing these acids was devised. Through use of ion-exchange resins, it was found that an arabic, tahla, or mesquite acid, could be produced at a high level of purity and relatively low cost. A discussion of the advantages of gum arabic and its disadvantages when used in a lithographic coating is given. The reproduction ability of the new arabic acid base is stressed as a means of getting better dot fidelity. It is hoped that the described process will be of use to those in research who desire an economical, reliable, source of high molecular weight water soluble acids.