MELT VISCOSITY-REDUCING AGENT FOR POLYESTER RESIN, AND POLYESTER FIBER

摘要

PURPOSE:To obtain the title agent which can reduce the melt viscosity of polyes ter resin without decreasing the degree of polymerization and can be easily spun to give high tenacity polyester fiber by selecting a melt viscosity reducing agent comprising a specified compound. CONSTITUTION:The title melt viscosity-reducing agent is selected which comprises a compound of formula I [wherein A1 and A2 are each 6-18C alkyl or arylalkyl; (n) is 0 to 1; X is a group of formula II (wherein R1 and R2 are each H or 1-4C alkyl), S, SO2 or O] or a compound of formula III (wherein R3 and R4 are each 6-18C alkyl; (l) and (m) are each such an integer that (l)+(m) is 1 to 3).