ARTICLES, INCLUDING MEMBRANES MADE FROM EXPANDED POLYTETRAFLUOROETHYLENE WITH WINDING THIN FIBRES AND CONTAINING DISCONTINUOUS LAYER OF FLUOROPOLYMER ON MEMBRANES Russian patent published in 2016 - IPC C08J7/04 

FIELD: chemistry.

SUBSTANCE: article comprises membrane from expanded polytetrafluoroethylene with winding thin fibres and having discontinuous fluoropolymer coating. Fluoropolymer can be located partially in pores of membrane from expanded fluoropolymer. In specific embodiments fluoropolymer is a fluorinated copolymer of ethylene and propylene. Application of stretching force partially straightens winding thin fibres, and so article is stretched. Membrane of expanded polytetrafluoroethylene may include microstructure practically only from fine fibres. Product can be extended to moment when further expansion is blocked with sharp increase in stiffness. In one version of articles are used to make a device of coated stent requires a small force to expand in radial direction to first diameter, but which is highly resistant to further expansion to second diameter (end point).

EFFECT: considerable increase of diameter to final point.

46 cl, 4 dwg