Constar International Holdings, a maker of plastic bottles primarily for food and beverage markets, has filed for Chapter 11 bankruptcy protection. This is the third bankruptcy filing since 2008 for the Trevose, PA-based company, which listed assets of as much as $100 million and debt as high as $500 million according to U.S. Bankruptcy Court papers. The largest unsecured creditors listed in the bankruptcy filing include DAK Americas and DAK Resinas de Mexico, owed more than $15 million, and Britvic Soft Drinks Ltd. of London, which is owed $5.43 million.