PRESSURE-SENSITIVE ADHESIVES Russian patent published in 2020 - IPC C09J123/14 

FIELD: chemistry.

SUBSTANCE: invention can be used for connection of jointed parts by means of adhesive tape, insulating tapes, self-adhesive films or labels, adhesive plasters. Pressure sensitive adhesive contains 5–50 wt % copolymers of propylene with ethylene and/or with olefins selected from group of 1-olefins with 4 to 6 carbon atoms, obtained using metallocene catalysts. Said copolymers are characterized by a pour point of less than 50 °C, measured according to ASTM D97, viscosity of 20–3,000 mPas at 170 °C, measured by a rotary viscometer according to DIN 53019, density of 0.84–0.90 g/cm³, measured at 23 °C to ISO 1183, glass transition temperature below −35 °C, measured by DSC (differential scanning calorimetry) method according to DIN EN ISO 11357–2: 2014. Said copolymers are polar modified and consist of 70–95 wt % of propylene structural units and 5–30 wt % of structural units selected from ethylene and/or group of 1-olefins with 4 to 6 carbon atoms. Pressure sensitive adhesive also contains 50–95 wt % of one or more components selected from a group of additional polyolefins, resins, waxes, plasticisers, natural or synthetic rubber, polyacrylates, polyesters, polychloroprenes, polyvinyl ethers or polyurethanes, pigments, fillers, stabilizers and antioxidants.

EFFECT: invention enables to obtain an effective adhesive-melt, the formulation of which is formulated without using mineral oil products.

6 cl, 2 tbl, 1 ex