 CHICAGO--BUSINESS WIRE--R.R. Donnelley Sons Company NYSE: RRD RRD or the Company today announced that it has received an unsolicited proposal from Chatham Asset Management, LLC Chatham to acquire all of the outstanding shares of RRD for 7.50 per share in cash. Consistent with its fiduciary duties, and in consultation with its independent financial and legal advisors, the RRD Board of Directors will carefully review and consider the Chatham proposal to determine the course o 