Abstract: A polymer process aid (PPA) for reducing melt defects in extruded polyethylene in the absence of fluoropolymers. The PPA is inexpensive and is also very effective for the reduction of extruder pressures. The PPA functions especially well for the extrusion of linear low density polyethylene.

Abstract: The present invention provides containers for chemicals which require a high purity, such as chemicals for use in manufacturing computer chips and pharmaceuticals. Such containers should not contaminate the contents due to extraction or other phenomena. The present invention provides a container having a low metals content and a low hydrogen peroxide extractables.

Abstract: The extrusion of thermoplastic polyolefin, especially linear low density polyethylene (LLDPE) is improved by the use of a processing additive comprising a blend of a thermoplastic acrylic polymer and a fluorocarbon polymer. In a preferred embodiment, the processing additive is a homogeneous blend of a thermoplastic styrene/methyl methacrylate polymer and a thermoplastic copolymer of vinylidene fluoride and hexafluoropropylene. The polyolefin extrudates produced according to this invention have reduced levels of melt fracture when extruded in conventional polymer extrusion equipment.