POROUS PVDF FILM WITH HIGH WEAR RESISTANCE, METHOD OF ITS PRODUCTION, AS WELL AS METHOD OF ITS RINSING AND METHOD OF FILTRATION USING SAID FILM Russian patent published in 2011 - IPC B01D71/34 C08J5/22 C08J5/18 B01D69/08 C08L27/16 C08J9/28 

FIELD: process engineering.

SUBSTANCE: this invention relates to porous films used as filtration membranes. Proposed film comprise poly(vinylidene fluoride) as the main component and polyethylene glycol as hydrophilic component. Degree of crystallinity of poly(vinylidene fluoride) polymer makes 50% or higher, but not exceeds 90%, while product of degree of crystallinity of poly(vinylidene fluoride) polymer by specific area of film surface makes 300 (%·m²/g) or higher, but not exceeds 2000 (%·m²/g). Porous film is produced by extruding film-forming solution from injection orifice. Said solution comprises hydrophobic and hydrophilic components and common solvent. Film-forming solution is hardened.

EFFECT: improved water permeability and resistance to effects caused by porous poly(vinylidene fluoride) film reagents.

12 cl, 1 tbl, 11 ex