A sulfonated aromatic stain resist chemical consisting of the condensation product of phenol sulfonic acid, dihydroxy diphenol sulfone, and formaldehyde was separated by semi-prep scale reverse phase high pressure liquid chromatography. Stain resistance activity was demonstrated in only two of the ten fractions that were isolated, with very slight activity in another two fractions. The active stain resist component is a low molecular weight condensation product of the sulfonic acid and sulfone with the phenolic groups converted to alkyl aryl ethers. The active component comprises only about 10% of the total weight of the stain resist chemical.
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