MEMBRANES Russian patent published in 2016 - IPC B01D71/26 B32B27/32 E02D31/00 E04D5/10 C08L23/00 

FIELD: chemistry.

SUBSTANCE: invention relates to a polyolefin membrane suitable for use in waterproofing applications. Membrane comprises layer (A) and layer (B), wherein layer (A) comprises a composition (i), comprising following polymer components, all percentages are by weight: a) from 10 to 40 % of a propylene homopolymer and/or copolymer, containing over 85 % propylene and having a xylene insoluble fraction at room temperature more than 80 %; and b) from 60 to 90 % of one or more copolymers of α-olefin and ethylene containing less than 40 % ethylene and having a xylene soluble fraction at room temperature more than 70 %; amounts of (a) and (b) are given with respect to total weight of (a) and (b); and layer (B) comprises ethylene homopolymer and/or copolymer having density of 0.915 to 0.980 g/cm³; said layer (B) is at least partially connected to layer (A).

EFFECT: membrane has high inertness towards aggressive chemicals, has good mechanical properties, reduced surface stickiness and good heat sealability.

10 cl, 1 tbl, 2 ex