Sept 18 - Standard & Poor's Ratings Services said today that all of its preliminary ratings, including its preliminary 'B+' corporate credit rating, on Woodcliff Lake, N.J.-based pharmaceutical company Par Pharmaceutical Companies Inc. remain unchanged following a change to deal terms. The changes include the $75 million upsize to the term loan B, lowered pricing, and an expected improvement to EBITDA beginning in 2013 following a just-announced favorable study result. The additional proceeds fr