| 摘要 |
FIELD: chemistry.SUBSTANCE: invention relates to an expandable copolymer of tetrafluoroethylene, a porous material, containing such copolymer, a formed product from the porous material and a medical device, containing the said tetrafluoroethylene copolymer. The expanded tetrafluoroethylene copolymer contains 98 wt % or less of monomer tetrafluoroethylene units and at least 2.0 wt % of at least one other comonomer, different from tetrafluoroethylene. The said copolymer after processing at a temperature of about 290°C or lower demonstrates adhesion. At least one other comonomer represents olefin, selected from a group, consisting of ethylene, propylene and isobutylene, a fluorinated monomer, selected from a group, consisting of chlorotrifluoroethylene, hexafluoropropylene, vinylidenfluoride, vinylidendifluoride, hexafluoroisobutylene, trifluoroethylene, fluorodioxol and fluorodioxalane, a perfluoroalkylethylene monomer or a perfluoroalkylvinyl ether.EFFECT: elaboration of a polytetrafluoroethylene product, possessing high extrudability, which can be subjected to uniform stretching and makes it possible to obtain highly strong porous products.45 cl, 4 tbl, 4 dwg, 13 ex |
