New York--Chemical Week Associates announced Tuesday that it has agreed to acquire Chemical Engineering, Modern Plastics, Modern Plastics International, Modern Mold and Tooling, and related products and trade shows from The McGraw-Hill Cos., New York. Terms of the deal were not disclosed. The acquisitions will nearly triple the size of Chemical Week Associates, said Michael Silber, president-COO of Chemical Week Associates. Mr. Silber also said the acquisition extends Chemical Week Associates' reach into the plastics segment of the chemical industry, where the company previously had little reach. With the acquisition, Chemical Week Associates now produces eight magazines, five newsletters and 16 conferences and trade shows. For McGraw-Hill, the divestment continues the company's shedding of its vertical publications as it shifts its focus to Business Week, Standard & Poor's and its educational publishing division.