Global Polyester Polyols For Flexible Foams Market By Type (Vacuum Melting Method, Carrier Gas Melting Method, and Azeotropic Vapor Method), By Application (Furniture, Automotive, Footwear and Textile, Home Appliances, Packaging, and Others), By Region, and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2020-2029