NEW YORK (Standard&Poor's) Aug. 4, 2015--Standard&Poor's Ratings Services today assigned its 'AA-' issue-level rating on 3M Co.'s proposed medium-term notes, which will be issued with varying maturities. The company will use the proceeds from these notes for general corporate purposes. All of our other ratings on 3M remain unchanged. Our ratings on 3M reflects its "strong" business risk profile and "minimal" financial risk profile assessments, which result in an anchor of 'aa-'. The company has five operating segments aimed at different markets, which we believe provides it with some protection against cyclical downturns in any particular industry (a positive one-notch impact). Additionally, because we believe that 3M's credit measures are less predictable and that there is