Private equity firm Sun Capital Partners has purchased burger chain Johnny Rockets for an undisclosed amount.

Aliso Viejo, Calif.-based Johnny Rockets is a 1950’s-style restaurant chain with about 300 corporate and franchise-owned locations.

Red Zone Capital Management, a McLean, Va. private equity firm, sold Johnny Rockets.

Sun Capital, headquartered in Boca Raton, Fla., focuses on investing in struggling companies. The firm has invested in Boston Market Corp., Friendly’s Ice Cream LLC and Bar Louie Restaurants. Recently, the firm combined five of its packaging companies into one packaging company, called Exopack Holdings Sarl. 

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