Multilayer label, container including the same, and method for producing container
The present invention provides a multilayer label having good gas barrier properties and is capable of maintaining the gas barrier properties at a high level even when exposed to physical stresses such as deformation and impart. The present invention relates to a multilayer label for in-mold labeling. This multilayer label includes a base (X), a layer (Z) containing an aluminum atom, and a layer (Y) containing a polymer (A) having a functional group containing a phosphorus atom.
1. A multilayer label for in-mold labeling, comprising:
a base (X);
a layer (Z) containing an aluminum atom; and
a layer (Y) containing a polymer (A) having a functional group containing a phosphorus atom,
wherein
the polymer (A) is a polymer (Aa) having at least one functional group selected from the group consisting of a phosphoric acid group, a phosphorous acid group, a phosphonic acid group, a phosphonous acid group, a phosphinic acid group and a phosphinous acid group, and
the base (X) comprises a thermoplastic resin film layer.
2. The multilayer label according to claim 1 , comprising at least one pair of the layer (Z) and the layer (Y) that are disposed contiguous to each other.
3. The multilayer label according to claim 1 , wherein:
the layer (Z) comprises a layer (Z1) containing a reaction product (E);
the reaction product (E) is a reaction product formed by a reaction between a metal oxide (C) containing an aluminum atom and a phosphorus compound (D); and
in an infrared absorption spectrum of the layer (Z1), a maximum absorption wavenumber in a region of 800 to 1,400 cm −1 is 1,080 to 1,130 cm −1 .
4. The multilayer label according to claim 1 , wherein the layer (Z) comprises a deposited layer (Z2) of aluminum or a deposited layer (Z3) of aluminum oxide.
5. The multilayer label according to claim 1 , wherein the polymer (A) is a polymer (Aa) having at least one functional group selected from the group consisting of a phosphoric acid group and a phosphoric acid group.
6. The multilayer label according to claim 1 , having an oxygen transmission rate of 2 mL(m 2 ·day·atm) or less at 20° C. and 85% RH.
7. A container comprising the multilayer label according to claim 1 laminated thereon.
8. A method for producing a container, comprising:
placing the multilayer label according to claim 1 in a cavity between a female mold member and a male mold member; and
injecting a molten resin into the cavity to perform molding of a container body and lamination of the multilayer label to the container body simultaneously.