Windy City rail initials

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Possible Answers: CTA.

Last seen on: –The Washington Post Crossword – Nov 12 2018
LA Times Crossword 12 Nov 18, Monday
LA Times Crossword 7 Jan 2018, Sunday

Random information on the term “CTA”:

Cellulose triacetate, (triacetate, CTA or TAC) is a chemical compound produced from cellulose and a source of acetate esters, typically acetic anhydride. Triacetate is commonly used for the creation of fibres and film base. It is chemically similar to cellulose acetate. Its distinguishing characteristic is that in triacetate, at least “92 percent of the hydroxyl groups are acetylated.” During the manufacture of triacetate, the cellulose is completely acetylated; whereas in normal cellulose acetate or cellulose diacetate, it is only partially acetylated. Triacetate is significantly more heat resistant than cellulose acetate.

Triacetate, whose chemical equation is [C6H7O2(OOCCH3)3]n, was first produced commercially in the U.S. in 1954 by Celanese Corporation. Eastman Kodak was a manufacturer of CTA until March 15, 2007. Mitsubishi Rayon Co. Ltd. is the only remaining manufacturer. In 2010, Eastman Chemical announced a 70% increase in cellulose triacetate output at its Kingsport (TN) manufacturing site to achieve the increasing demand for the chemical’s use as an intermediate in the production of polarized films for liquid crystal displays (LCD)s.

CTA on Wikipedia