ADAPTIVE VAPOUR BARRIER Russian patent published in 2018 - IPC B32B27/34 E04B1/66 C08J5/18 C08G69/26 C08G69/42 

FIELD: chemistry.

SUBSTANCE: invention relates to the use of a water vapour barrier, as well as to a structural element comprising said barrier. Barrier used is films, fabrics or layers of material P. Material P comprises at least one copolymer A, which is a polyamide of the type PAXY/XAISMⁿ⁺_1/n, in particular PA66/6AISMⁿ⁺_1/n, more specifically PA66/6AISLi and/or PA66/6AISNa, or type PAZ/XAISMⁿ⁺_1/n, or consists of at least one copolymer A, where: X, Y and Z are, independently of one another, integers ranging from 3 to 36, preferably from 4 to 18 and especially from 4 to 12; n in Mⁿ⁺_1/n denotes charge M, and M is Li⁺, Na⁺, K⁺, Ag⁺, Cu⁺, Cu²⁺ Zn²⁺, Mn²⁺, Mg²⁺, Fe²⁺, Fe³⁺, Al³⁺, NH₄⁺ and/or phosphonium, in particular Li⁺ and / or Na⁺ and especially Li⁺; AIS is a residue derived from 5-sulfoisophthalic acid; and optionally in combination with a carrier and / or an adhesive.

EFFECT: technical result consists in the development of a barrier that allows to eliminate low vapour permeability at low humidity and high vapour permeability at a high humidity level.

16 cl, 3 ex