SELF-ADHESIVE COMPOSITION

The invention covers the self-adhesive compound with high vapour permeability at high relative humidity and low vapour permeability at low relative humidity, for application on non-wovens, films, laminates, membranes and other materials used as coverings, especially in construction industry. The compound consists of two basic components: in 2 to 80% (by weight) of hydrophobic polymer, and of filler with variable water vapour permeability completing the 100% (by weight) of the mass of the self-adhesive compound. The alternative composition contains:- thermo-plastic hydrophobic polymer base, being 2 to 50% (by weight) of self-adhesive material,- hydrophilic filler with variable permeability of water vapour depending on relative humidity: completion to 100% (by weight) of the self-adhesive compound,- plasticizer, compatible with the polymer base: 0 to 50% (by weight) of the material, and- hydrocarbon, or monomer resin, or colophony ester: 0 to 50% (by weight) of the self-adhesive.The composition of the compound may be supplemented with colorants or antioxidants, or other additional components, jointly not exceeding 10% by weight, whereas the share of a single additive is not more than 2% (by weight) of the self-adhesive compound. Usually, the polymer base is a block co-polymer, or contains a mer of polyisobutylene in its molecule, and the size of the grain of hydrophilic filler does not exceed 250 µm.