Global Polybutylene Terephthalate Pbt Plastic Market By Type (with Number Average Molecular Weights of 23,000-30,000 Type, with High Molecular Weights of 36,000-50,000 Type), By Application (Automotive, Electrical and Electronic, Commercial Instrument, Textile, Home Appliance, Industrial and Mining Equipment, and Other), By Region, and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2020-2029