EXTRUDABLE PRESSURE-SENSITIVE ADHESIVE BASED ON POLYBUTENE-1, SUITABLE FOR PACKAGING WITH THE POSSIBILITY OF RE-CLOSING Russian patent published in 2021 - IPC C09J123/20 C08L23/20 B65D77/12 A61J1/03 B32B27/32 B29C49/00 

FIELD: chemical industry.

SUBSTANCE: invention relates to chemical industry, it can be used when manufacturing packaging units for food products, which are heated in microwave oven or oven, means of closing the packaging units for drugs, as well as hygienic, refreshing or cosmetic wipes. The composition of pressure-sensitive adhesive contains, wt.%: 35-74 of i) at least one butene-1 (co)polymer; 5-50 of ii) at least one liquid sticky agent; 10-50 of iii) at least one solid sticky agent; 0-30 of iv) at least one additional (co)polymer other than i); 0-30 of v) at least one additive. The content of butene-1 in the specified butene-1 (co)polymer is 85-100% mole. The specified liquid and solid at 25°C sticky agents at 140°C have a viscosity of 15-40 Pa·s and 0.5-5 Pa·s, respectively. The specified additional polymer other than i) contains olefin (co)polymer. The additive contains a compound selected from plasticizers, waxes, stabilizers and modifying agents, antioxidants or mixtures thereof. The composition has a viscosity of 300-2000 Pa·s at 200°C. To obtain a product, a film is formed from the specified composition using blown film head, and this film is brought into contact with two other layers as a medium layer.

EFFECT: invention provides for sufficient stickiness after the packaging has been repeatedly opened and closed.

15 cl, 1 tbl