Microporous membrane

C - Chemistry – Metallurgy – 08 – J

Patent

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Details

C08J 9/28 (2006.01) B01D 67/00 (2006.01) B01D 69/02 (2006.01) B01D 71/34 (2006.01) C08J 9/00 (2006.01)

Patent

CA 2322855

A microporous film which is produced by cooling a solution comprising a vinylidene fluoride polymer having a weight-average molecular weight of 1x105 or higher and a solvent therefor to form a two-phase gel and comprises a polymer phase comprising the vinylidene fluoride polymer and having pores which have an average pore diameter as measured by the half-dry method of 0.005 to 5 µm and extend from one to the other side of the film, wherein the inner structure is a percolation structure defined by the following(A):(A)a structure which is an isotropic network structure consisting of a polymer phase three-dimensionally branched in random directions and having, surrounded by the polymer phase, interconnecting pores in which the ratio of the maximum pore diameter as measured by the bubble point method to the average pore diameter as measured by the half-dry method is 2.0 or lower.

La présente invention concerne un film microporeux qui est produit au moyen du refroidissement d'une solution contenant un polymère de fluorure de vinylidène présentant un poids moléculaire moyen en poids supérieur ou égal à 1 x 10?5¿ et un solvant approprié pour former un gel à deux phases. Le film microporeux présente une phase polymère comprenant le polymère de fluorure de vinylidène et comporte des pores d'un diamètre moyen compris entre 0,005 et 5 µm mesuré par analyse par voie semi-sèche qui s'étendent d'un côté à l'autre du film; la structure interne étant une structure de percolation définie par la structure (A) qui est une structure réticulaire isotrope constituée d'une phase polymère à ramification tridimensionnelle orientée dans des directions aléatoires et comportant des pores d'interconnexion entourés par la phase polymère, dont le rapport du diamètre de pore maximal, mesuré par la technique du point de bulle, et du diamètre de pore moyen, mesuré par analyse par voie semi-sèche est inférieur ou égal à 2,0.

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