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Multilayer structure and easily openable container and lid
| Details |
Inventors: Yamada, Toyokazu;
Assignee: Idemitsu Petrochemical, Co., Ltd. (Tokyo, JP)
Primary Examiner: Seidleck; James J.
Assistant Examiner:
Attorney, Agent or Firm: Antonelli, Terry, Stout & Kraus
A multilayer structure comprising (C) a substrate layer, (A) a surface layer of a thermoplastic resin, and (B) an intermediate layer of a thermoplastic resin sandwiched between the (C) substrate layer and the (A) surface layer, wherein the (B) intermediate layer contains 0 to 70% by weight of a flake inorganic filler, the peeling strength between the (A) surface layer and the (B) intermediate layer is from 0.3 to 2.0 kg/15 mm, and the peeling strength between the (B) intermediate layer and the (C) substrate layer is at least 1.2 times as large as the peeling strength between the (A) surface layer and the (B) intermediate layer. When a packaging container is produced by forming the multilayer structure into a container body and sealing the container body with a lid, easy openability and high sealing property will be ensured because the opening of the packaging container is not operated by using the delamination between the sealed portion but by using the easy delamination between the surface layer (A) and the intermediate layer (B). The use of the multilayer structure for production of packages is economically advantageous because the recovered scrap can be reused as the material for the substrate layer (C) without affecting the peelability of the surface layer (A). |
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DETAILED DESCRIPTION An object of the present invention is to provide a multilayer structure which ensures a stable peeling strength regardless of the alteration of molding conditions, the combination of the resin materials of layers, and the like, can make the most of the characteristics of the base materials by varying the combination of the resin materials, and, further, can be recovered as scrap to be reused as material.
Another object of the present invention is to provide an easily openable container and an easily openable lid by using the multilayer structure, both having excellent sealing property and openability.
The inventors studied diligently to attain the above objects and found that the above problems can be solved by using a multilayer structure having a particular layer construction to produce containers or lids, and has consequently completed the present invention.
That is, the present invention provides a multilayer structure comprising (C) a substrate layer, (A) a surface layer of a thermoplastic resin, and (B) an intermediate layer of a thermoplastic resin sandwiched between the (C) substrate layer and the (A) surface layer, wherein the (B) intermediate layer contains 0 to 70% by weight of a flake inorganic filler, the peeling strength between the (A) surface layer and the (B) intermediate layer is from 0.
3 to 2.
0 kg/15 mm, and the peeling strength between the (B) intermediate layer and the (C) substrate layer is at least 1.
2 times as large as the peeling strength between the (A) surface layer and the (B) intermediate layer.
Further, the present invention provides a multilayer sheet comprising (C) a substrate layer, (A) a surface layer of a thermoplastic resin, and (B) an intermediate layer of a thermoplastic resin sandwiched between the (C) substrate layer and the (A) surface layer, wherein the (B) intermediate layer contains 0 to 70% by weight of a flake inorganic filler, the peeling strength between the (A) surface layer and the (B) intermediate layer is from 0.
3 to 2
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Adhesives and Rubbers 
