MICROPOROUS AIR-PERMEABLE STRUCTURAL MATERIALS CONTAINING COATED WOVEN AND/OR NONWOVEN MATERIALS, AND METHOD OF PRODUCING SAID MATERIALS Russian patent published in 2011 - IPC C08J5/18 B32B27/12 

FIELD: chemistry.

SUBSTANCE: air-permeable material contains a woven layer on which there is a polymer film layer. The polymer film layer contains a polymer composition and filler, where the air-permeable material was exposed to physical action in order to make the polymer layer mircroporous, so that SPVP of the air-permeable material is greater than 50 g/m²·24 h, and where the air-permeable material has primary dimension on the length and primary dimension on the width before the said physical action and secondary dimension on the length and secondary dimension on the width after the said physical action, where the secondary dimension on the length is not more than 2% greater than the primary dimension on the length and the secondary dimension on the width is not more than 2% greater than the primary dimension on the width. The invention also discloses methods of producing air-permeable material with said properties.

EFFECT: design of air-permeable material with improved properties.

49 cl, 11 dwg, 3 ex