Global Polyvinyl Alcohol Market By Type (Low Viscosity (4.0?7.0) , Medium Viscosity (21.0?33.0) , and High Viscosity (40.0?65.0)), By Application (Chemical Industry , Textile , Construction , Pharmaceutical , and Others), By Region, and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2019-2028