Laminate having layer containing saponified ethylene/vinyl ester copolymer, secondary molded article thereof, and method for manufacturing bottomed container
The laminate of the present invention a laminate comprising a layer comprising a saponified ethylene/vinyl ester copolymer and a layer which comprises a thermoplastic resin that is not an EVOH resin and which has been laminated to at least one surface of the layer comprising a saponified ethylene/vinyl ester copolymer via a layer comprising an adhesive resin, wherein shear viscosity ratio of the saponified ethylene/vinyl ester copolymer and the adhesive resin (saponified ethylene/vinyl ester copolymer to adhesive resin) is 0.70-1.50 at a shear rate of 0.1 [1/s] and 0.90-1.10 at a shear rate of 1.0 [1/s].
1. A laminate comprising
a layer comprising a saponified ethylene/vinyl ester copolymer and
a layer which comprises a thermoplastic resin that is not a saponified ethylene/vinyl ester copolymer or a polyester resin and which has been laminated to at least one surface of the layer comprising a saponified ethylene/vinyl ester copolymer via a layer comprising an adhesive resin,
wherein shear viscosity ratio of the saponified ethylene/vinyl ester copolymer and the adhesive resin (saponified ethylene/vinyl ester copolymer to adhesive resin) is 0.70-1.50 at a shear rate of 0.1 [1/s] and 0.90-1.10 at a shear rate of 1.0 [1/s];
wherein the saponified ethylene/vinyl ester copolymer comprises:
a first EVOH resin (A1) having an ethylene content of 20-40% by mole, and
a second EVOH resin (A2) having an ethylene content of 40-60% by mole,
wherein the blending ratio between the first EVOH resin (A1) to the second EVOH resin (A2), A1/A2 (weight ratio), is 75/25 to 70/30; and
wherein the layer comprising a saponified ethylene/vinyl ester copolymer contains a zinc salt of a fatty acid having 8 or more carbon atoms in an amount by mass of 350-800 ppm in terms of the saponified ethylene/vinyl ester copolymer.
2. The laminate according to claim 1 , wherein the saponified ethylene/vinyl ester copolymer is a mixture of two or more saponified ethylene/vinyl ester copolymers which differ in the content of structural ethylene units.
3. The laminate according to claim 2 , wherein the difference in the ethylene content of the structural ethylene units (ΔEt) between the saponified ethylene/vinyl ester copolymer which is the highest in the ethylene content and the saponified ethylene/vinyl ester copolymer which is the lowest in the ethylene content, of the two or more saponified ethylene/vinyl ester copolymers, is 10-25% by mole.
4. The laminate according to claim 1 , wherein the thermoplastic resin is polypropylene.
5. A process for obtaining a bottomed container, the process comprising:
heating and softening a sheet or film of the laminate according to claim 1 ;
appressing the sheet or film to a forming die by at least one of vacuum suction and compressed air; and
obtaining a bottomed container by cooling and demolding the appressed sheet or film.