Microporous polyolefin membrane, its production method,...

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 9/26 (2006.01) C08J 9/00 (2006.01) H01M 2/16 (2006.01) H01M 10/40 (2006.01)

Patent

CA 2630251

A microporous polyolefin membrane which comprises a polyethylene resin and in which (a) the shutdown temperature is 135~C or lower which is the temperature at which the gas permeability as measured with heating at a heating rate of 5 ~C/min reaches 1~105 sec/100 cm3, (b) the maximum degree of melt shrinkage in the transverse direction in the temperature range of 135-145~C is 40% or lower as measured by thermomechanical analysis at a load of 2 gf and a heating rate of 5 ~C/min, and (c) the meltdown temperature is 150~C or higher which is the temperature at which the gas permeability as measured with further continuous heating beyond the shutdown temperature reaches 1~105 sec/100 cm3 again.

L'invention concerne une membrane polyoléfinique microporeuse caractérisée en ce qu'elle comprend une résine de polyéthylène. Ladite membrane est également caractérisée en ce que: a) la température d'arrêt, qui est inférieure ou égale à 135 °C correspond à la température à laquelle la perméabilité aux gaz mesurée par chauffage avec un gradient de température de 5 °C/mn, atteint 1x10<SUP>5 </SUP>s/100cm<SUP>3</SUP>; b) le rétrécissement maximum d'un produit fondu (mesuré par analyse thermomécanique) dans le sens transversal à une température comprise entre 135 et 145 °C est inférieur ou égal à 40 % à une charge de 2 gf et à un gradient de température de 5 °C/mn; et c) la température de fusion, qui est supérieure ou égale à 150 °C correspond à la température à laquelle la perméabilité aux gaz<SUP/>mesuré<SUP/>par un autre chauffage continu au-delà de la température d'arrêt, revient à 1x10<SUP>5</SUP> s/100 cm<SUP>3</SUP>.

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