Flexible multilayer vinylidene fluoride tubes

摘要

The invention relates to a tough, flexible multi-layer tube or other structure having a vinylidene fluoride contact layer. Such a tube is especially useful for high-purity contact applications, and contact where chemical resistance is needed. The vinylidene fluoride layer is melt-processible and may be a homopolymer, copolymer or terpolymer.

主权项

1. A multi-layer flexible structure in contact with bioloEical, biomedical or biopharmaceutical fluids comprising:
a) a contact layer consisting of a poiyvinylidene fluoride polymer (PVDF) copolymer or terpolymer where vinylidene fluoride units comprise at least 70 percent by weight of said polymer and hexafluoropropene (HFP) monomer units comprise from 2 to 30 weight percent of said polymer; and b) one or more elastomeric layers, wherein the polyvinylidene fluoride layer is either
1) adhered directly to the elastomeric layer, wherein the elastomeric layer is selected from the group consisting of acrylate rubber, and fluoroelastomer; or2) adhered indirectly to the elastomeric layer, using one or more tie layers, wherein each tie layer consists of materials selected from the group consisting of maleic anhydride grafted PVDF, functionalized polyethylene, a thermoplastic polyurethane (TPU), chlorinated polyethylene, fluoropolymer, polymethylmethacralate, and blends thereof.