D.H. Litter Company, Inc., a regional distributor of specialty chemicals to the coatings, plastics, graphic arts, adhesives and consumer care industries in the Northeast and Mid-Atlantic U.S., has named Vic Langley account manager for the New England/upstate New York region, with responsibility for sales and new account development.      Mr. Langley was formerly director of marketing for Performance Polymers, and has previous distribution sales and marketing experience with The Truesdale Co. a...