Patent ID: 6998158

Claim:
A multilayer elastomeric material comprising: at least two outermost elastomeric barrier layers L 1 and L 3 , respectively having a breaking stress σ 1 and σ 3 , a thickness e 1 and e 3 , and an elastic constant E 1 and E 3 , enclosing at least one intermediate layer L 2 consisting of an elastomeric matrix comprising at least one dispersion of droplets of at least one composition containing at least one active substance, the intermediate layer L 2 having a breaking stress σ 2Tot , a thickness e 2 , and an elastic constant E 2 , wherein the mean diameter of the droplets is at least 10 μm and that the material satisfies the following double inequality (I): (σ 2Tot ·e 2 )<(σ 1 ·e 1 ) and (σ 2Tot ·e 2 )<(σ 3 ·e 3 ) (I) in which: σ 2Tot represents the breaking stress of the charged elastomeric material constituting the layer L 2 , and σ 1 , σ 3 , e 1 , e 2 and e 3 are as defined above.