Milliken + Co

Richard Allan VanDahm

Eric B Stephens

Robert L Mahaffey

Ricky Lee Ritz

X Michael Hong

This invention relates to compositions of N,N'-dialkyleneoxy-substituted 1,4-diaminoanthraquinone colorants which contain a low percentage of impurities, to a process to make the compositions, and also to the use of the compositions thus prepared for coloring consumer products.

Anthraquinone colorant compositions and methods for producing the same

Purified bisphenol A ethoxylates are provided which are produced through the base-catalyzed addition of ethylene oxide to a bisphenol A. The purification step involves the neutralization with a mineral acid (namely phosphoric acid) and subsequent treatment with a colloidal metal silicate. The neutralization step removes substantially all of the excess cation (or salt) of the base catalyst to produce a uniformly low salt content bisphenol A ethoxylate. Such a low-salt product is thus easy to produce in continuously high yields. The process itself is also encompassed within this invention.

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Spartanburg, SC, United States of America

Richard Allan VanDahm