Patent ID: 7578873

Claim:
An air treatment device using a volatile treating agent contained inside a permeable container ( 1 ), wherein the treating agent is a liquid packaged by absorption inside a cohesive spongy body ( 2 ) occupying at least partially the available volume of a chamber ( 3 ) formed by an internal channel of the container ( 1 ); wherein the container ( 1 ) is a rigid container fitted with a cap ( 4 ); wherein the container ( 1 ) and the cap ( 4 ) enclose the cohesive spongy body ( 2 ) within the chamber ( 3 ); wherein the container ( 1 ) is a plastic material with a talc filler in a proportion of between 0% and 40% for a wall thickness of between 0.5 mm and 2 mm; wherein the plastic material constituting the container ( 1 ) is of the polypropylene type; and wherein, for a required annual diffusion X expressed in mg/day, the ratio between the thickness Ep and the diffusion surface S of the container ( 1 ) is established according to the following rule; X=6.05*10.sup.-8*S*exp((0.0452T-15.89)*Ep+0.0451T) wherein: S is the diffusion surface of the container expressed in mm. sup.2, Ep is the thickness of the container expressed in mm, T is the average ambient temperature expressed in degrees Kelvin.