FIELD: process engineering.
SUBSTANCE: invention relates to membranes used for waterproofing, in particularly, to membranes to be used in roofing or in drain coatings. Proposed membranes comprises main layer A and top layer B. Layer A is made from heterophase composition (I) containing the following components in wt %: a) 10-40 of propylene homopolymer or propylene copolymer containing over 85% of propylene and having the fraction of components insoluble in xylene at room temperature exceeding 80%, and b) 60-90 of one or several copolymers of α-olefin/ethylene containing less than 40% of ethylene soluble in xylene at room temperature exceeding 70%. Layer B comprises one or several propylene homopolymers and copolymers containing 65-99% of propylene. Layer B is, at least, partially linked to main layer A.
EFFECT: better extensibility and rupture strength, lower surface ductility.
10 cl, 3 tbl, 4 ex
