3M has entered into a definitive agreement to acquire Polypore’s Separations Media business for $1.0 billion. The business provides microporous membranes and modules for filtration in the life sciences, industrial and specialty segments, and had 12-month sales of $210 million as of September 2014.   Polypore’s Separations Media business expands 3M’s core filtration platform with technology, manufacturing, and global capabilities for high performance “ultra” filtration that membrane technology de...