US 12,172,424 B2
Multilayer structure for diffusion of volatile substances
Cedric Morhain, Barcelona (ES); Livio Sordo, Trento (IT); and Stefano Deflorian, Trento (IT)
Assigned to Zobele Holding SPA, Trento (IT)
Appl. No. 16/473,903
Filed by Zobele Holding SPA, Trento (IT)
PCT Filed Dec. 27, 2016, PCT No. PCT/EP2016/082693
§ 371(c)(1), (2) Date Jun. 26, 2019,
PCT Pub. No. WO2018/121837, PCT Pub. Date Jul. 5, 2018.
Prior Publication US 2019/0337265 A1, Nov. 7, 2019
Int. Cl. B32B 7/06 (2019.01); A61L 9/04 (2006.01); B32B 5/02 (2006.01); B32B 5/18 (2006.01); B32B 15/04 (2006.01); B32B 15/08 (2006.01); B32B 15/14 (2006.01); B32B 15/20 (2006.01); B32B 27/06 (2006.01); B32B 27/08 (2006.01); B32B 27/12 (2006.01); B32B 27/20 (2006.01)
CPC B32B 7/06 (2013.01) [A61L 9/04 (2013.01); B32B 5/022 (2013.01); B32B 5/18 (2013.01); B32B 15/046 (2013.01); B32B 15/08 (2013.01); B32B 15/14 (2013.01); B32B 15/20 (2013.01); B32B 27/065 (2013.01); B32B 27/08 (2013.01); B32B 27/12 (2013.01); B32B 27/20 (2013.01); A61L 2209/131 (2013.01); B32B 2250/03 (2013.01); B32B 2260/021 (2013.01); B32B 2262/0253 (2013.01); B32B 2262/062 (2013.01); B32B 2264/10 (2013.01); B32B 2266/08 (2013.01); B32B 2307/7242 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A multilayer structure for volatile substances diffusers, the multilayer structure comprising:
a semi-permeable layer that is exposed to contact with the volatile substances;
a barrier layer to prevent the diffusion of the volatile substances before removal of the barrier layer from the multilayer structure; and
a tear layer placed between the barrier layer and the semi-permeable layer permitting the separation of the barrier layer from the semi-permeable layer when the barrier layer is removed from the multilayer structure, the tear layer is a heterophasic layer composed of areas of higher mechanical resistance and areas of lower mechanical resistance surrounding the areas of higher mechanical resistance and behaving as boundaries that remains partially on both the semipermeable layer and the barrier layer after activation, wherein said tear layer comprises fibers that are bound together either mechanically or by use of binder.