Solvay and Eastman Chemical Company have signed a definitive agreement to end their cellulose acetate production joint venture Primester with Solvay acquiring Eastman’s 50 percent stake in the US-based plant and becoming its sole owner.   “After our partnership of 25 years, this agreement allows Solvay to continue securing the most economical long term supply of cellulose acetate flake for its own tow business in Germany, Brazil and Russia, while adapting capacity to demand,” said Philippe Ros...