According to a new study by the consulting firm Kusumgar, Nerlfi & Growney, consumption of five of the leading additives for coatings and inks in 2013 was 1.02 million tons, as supplied, worth $4.66 billion. A 5% annual rate of growth is forecast through 2018. Included are rheology modifiers, foam control agents, wetting agents, dispersants, and slip and rub materials.   Rheology modifiers are the largest additives type representing nearly 40% of the tons in 2013. A wide variety of rheolog...