Multilayer film for reclosable pet packaging

A multilayer film comprising:

• an adhesive layer A having a thickness of 7 to 50 μm and consisting of an extrudable hot-melt self-adhesive composition a which has a melt flow index (or MFI), measured for a temperature of 190° C. and a total weight of 2.16 kg, ranging from 0.01 to 200 g/10 minutes and which comprises, on the basis of the total weight of said composition a:
• from 40% to 70% by weight of a composition a1 of styrene block copolymers with at least one elastomer block, said composition a1 consisting of, on the basis of its total weight:
• of 30% to 90% by weight of at least one diblock copolymer of styrene-isoprene block copolymer (SI), styrene-butadiene/isoprene block copolymer (SBI), styrene-isoprene/butadiene block copolymer (SIB), styrene-butadiene block copolymer (SB), styrene-ethylene/butylene block copolymer (SEB), styrene-ethylene/propylene block copolymer (SEP), and
• of 10% to 70% by weight of at least one triblock copolymer of styrene-isoprene-styrene block copolymer (SIS), styrene-isoprene/butadiene-styrene block copolymer (SIBS), styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene/butylene-styrene block copolymer (SEBS), styrene-ethylene/propylene-styrene block copolymer (SEPS);
• the total content of styrene units of said composition a1 being 10% to 40% by weight on the basis of the total weight of a1;
• and
• from 30% to 60% by weight of one or more tackifying resins a2 having a softening temperature of between 5 and 140° C.;
• a complexable thin layer B consisting of a thermoplastic b;
• and
• a heat-sealable and cleavable layer C having a thickness of 10 to 150 μm;
• the layers B and C being linked to one another by the layer A;
• and
• wherein in said film the layer C consists of a composition c of, on the basis of the total weight of c, a content by weight of at least 95% of at least one linear copolyester C1 obtained by polycondensation of a composition m of monomers of:
• at least one diol (i),
• at least one compound (ii) that is terephthalic acid or a diester derivative thereof, optionally substituted with an alkyl radical, and
• at least one compound (iii) that is an aromatic or aliphatic dicarboxylic acid or a diester or anhydride derivative thereof;
• the amounts of the monomers (i), (ii) and (iii) used in the polycondensation being such that the softening temperature of C1 is below 190° C.