发明申请
US20100048081A1 BIODEGRADABLE POLYESTERS FOR USE IN FORMING FIBERS 审中-公开
用于成型纤维的生物可降解聚酯

BIODEGRADABLE POLYESTERS FOR USE IN FORMING FIBERS
摘要:
A method for forming a biodegradable polyester suitable for use in fibers is provided. Specifically, a biodegradable polyester is melt processed at a controlled water content to initiate a hydrolysis reaction. Without intending to be limited by theory, it is believed that the hydroxyl groups present in water are capable of attacking the ester linkage of the polyester, thereby leading to chain scission or “depolymerization” of the polyester molecule into one or more shorter ester chains. By selectively controlling the reaction conditions (e.g., water content, temperature, shear rate, etc.), a hydrolytically degraded polyester may be achieved that has a molecular weight lower than the starting polymer. Such lower molecular weight polymers have a higher melt flow rate and lower apparent viscosity, which are useful in a wide variety of fiber forming applications, such as in the meltblowing of nonwoven webs.
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