Global Polystyrene Resin Market By Type (Super High Impact Polystyrene Resin, High Impact Polystyrene Resin, and Medium Impact Polystyrene Resin), By Application (Injection Molding, Profile Extrusion, and Sheet Extrusion), By Region, and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2019-2028