Laminate having layer containing saponified ethylene/vinyl ester copolymer, secondary molded article thereof, and method for manufacturing bottomed container

Patent metadata

Field	Value
Publication number	US-11207873-B2
Application number	US-201515527101-A
Country	US
Kind code	B2
Filing date	Nov 18, 2015
Priority date	Nov 18, 2014
Publication date	Dec 28, 2021
Grant date	Dec 28, 2021

Abstract

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].

First claim

The invention claimed is:

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.

Assignees

• Mitsubishi Chem Corp

Inventors

• Inoue Kota
• Komuro Ryohei

Classifications

• B32B2439/00

  Containers; Receptacles · CPC title

• B32B27/22

  using plasticisers · CPC title

• B32B27/20

  using fillers, pigments, thixotroping agents · CPC title

• B32B2307/7242

  Non-permeable · CPC title

• B32B2250/24

  All layers being polymeric · CPC title