PROCESS FOR MAKING A HIGH MELT VISCOSITY BLOCK COPOLYESTER

摘要

A novel process is disclosed for preparing a high melt viscosity block co-polyester of at least two different linear polyesters. The process comprises melt blending the polyesters and, thereafter, subjecting the melt blended polyesters to a temperature of 10 DEG -50 DEG C. below the melting point of the lowest melting ingredient in the blend until the melt viscosity has increased to at least 10,000 poises at a temperature 10 DEG -15 DEG C. above the melting point of the blend.