The Specialty Chemicals Market Volume Index, a tool created by the American Chemistry Council (ACC) entered the fourth quarter on a tepid note, slipping back 0.1 percent on a three-month moving average (3MMA) basis in October after a 0.3 percent gain in September and a weak first half of the year.   Weakness in 2015 continues to be centered in oilfield chemicals and a few other segments that combined weighed on overall volumes. Of the twenty-eight specialty chemical segments we monitor, sixtee...