CUYAHOGA FALLS, OH – Emerald Polymer Additives, a division of Emerald Performance Materials, has named William Broadhurst General Manager of its polymer additives and nitrile latex product lines. In this role, Broadhurst will lead the two businesses and will be responsible for sales, marketing and product-line management. He will work closely with operations and research and development to help the business achieve its growth and profitability goals.