BREATHABLE MICROPOROUS FILM

摘要

A breathable microporous film having improved extensibility is disclosed. Th e microporous breathable film is formed from a mixture of a thermoplastic polymer and particles of an inorganic filler, and is provided with breathability by stretching it in at least one direction. The microporous fi lm is provided with a better extensibility by selecting the particle size of th e inorganic filler, and the moisture content of the particles of inorganic filler and of the thermoplastic polymer when they are blended together to provide the mixture, and by controlling the Dart Resistance of the film. A composite layered breathable structure comprising the microporous film is al so disclosed, and moreover a disposable absorbent article comprising a microporous breathable film which is imparted extensibility by means of mechanical straining.