Patent ID: 8062742

Claim:
A method for manufacturing an air permeable structure, comprising: adding a curing agent to an undiluted silicone solution to form a silicone solution; coating a non-woven polyester base material with the silicone solution, wherein the polyester base material comprises an open cell structure and a thickness ranging from 5 to 50 mm; and the silicone coating disposed on the cells of the open cell structure and both surfaces of the polyester base material, wherein the original open cell structure of the polyester base material is maintained after the silicone coating is disposed on the polyester base material, curing the coated polyester base material, wherein a first side of the air permeable structure is more densely coated than a second opposite side of the air permeable structure, the coating on the first side of the air permeable structure having a thickness ranging from 10 to 30% of the thickness of the entire air permeable structure.