PROTECTIVE FILMS AND PRESSURE-SENSITIVE ADHESIVE Russian patent published in 2011 - IPC C09J153/00 C09J153/02 C08J3/12 A61L15/16 

FIELD: chemistry.

SUBSTANCE: protective film includes a substrate layer and a pressure-sensitive adhesive composition. The substrate layer is preferably an extrudable substrate layer. The adhesive composition contains a block-copolymer, tackifying resin and, optionally, polyolefin, plasticiser and antioxidant. The block-copolymer contains at least two poly- or mono-vinylaromatic hydrocarbon blocks and at least one hydrogenated block of poly- or conjugated diene. The adhesive composition is obtained through dry mixture of components. The dry mixture is extruded and granulated in an underwater granulator to obtain wet granules. The wet granules are dried. The wet or dry granules can be treated with a powdering agent.

EFFECT: adhesive composition combines high adhesion during peeling and high melt flow rate.

13 cl, 3 tbl