Highly breathable biodegradable films

摘要

A breathable film having a base layer comprising first filler particles and second filler particles dispersed within a biodegradable polymer matrix is provided. The first filler particles constitute from about 25 wt.% to about 75 wt.% of the base layer and the second filler particles constitute from about 0.1 wt.% to about 10 wt.% of the base layer. The ratio of the average size of the first filler particles to the average size of the second filler particles being from about 2 to about 100. The film exhibits a water vapor transmission rate of about 2,000 g/m/24 hours or more and a peak load in the machine direction of about 800 grams-force per inch or more.