US Ink, a division of Sun Chemical Corporation, has named Gregory M. Lawson executive vice president, charged with overall direction of international operations including strategic planning, sales and marketing, as well as information technology.  Mr. Lawson, whose appointment became effective July 1, 2002, reports directly to president Ronald C. Baker.      Mr. Lawson brings to US Ink more than 21 years of experience in the graphic arts industry, which includes launching and managing a number...