Processing aids for olefinic webs, including electret webs

摘要

Methods of preparing polymeric webs include hot melt blending of thermoplastic resins and processing aids. The process aids include hindered amine N-substituted succinimide oligomers. The webs prepared from the blends may be in the form of films or non-woven fibrous webs. Non-woven microfiber webs are useful as filtration media. Among the polymeric webs produced are electret webs. The processing aids also function as charge-enhancing additives for the electret webs.

主权项

1. A method of preparing a web comprising:
preparing a blend comprising:
a thermoplastic resin; anda processing aid, the processing aid comprising a hindered amine N-substituted succinimide oligomer; hot melt mixing the blend, wherein the melt viscosity of the blend of the processing aid and the thermoplastic resin is lower than the melt viscosity of the thermoplastic resin without the processing aid at a temperature of 250° C. or higher; and forming a web from the hot melt blend.