Ethylene-vinyl alcohol copolymer composition and multilayered container using the same
AssigneeKuraray Co., Ltd.
InventorsShinji Tai, Hiroyuki Shimo, Masakazu Nakaya
Life of this patent
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Abstract
A resin composition comprising 70 to 99.9% by weight of ethylene-vinyl alcohol copolymer (A) and 0.1 to 30% by weight of a thermoplastic resin (B) other than the ethylene-vinyl alcohol copolymer (A) is provided. In the resin composition, an ethylene content ETa (mol %) and a degree of saponification SDa (%) of the ethylene-vinyl alcohol copolymer (A) satisfy the following equations (1) and (2): 25≦ETa≦55 (1) 90≦SDa<99, (2) and an oxygen absorption rate of the resin composition is 0.01 ml/m2·day or more.
Claims18
A resin composition comprising ethylene-vinyl alcohol copolymer (A), a thermoplastic resin (B) other than the ethylene-vinyl alcohol copolymer (A), and a transition metal salt (C), wherein
- the ethylene-vinyl alcohol copolymer (A) is contained in an amount of 70 to 99.9% by weight and the thermoplastic resin (B) is contained in an amount of 0.1 to 30% by weight, an ethylene content ETa (mol %) and a degree of saponification SDa (%) of the ethylene-vinyl alcohol copolymer (A) satisfy the following equations (1) and (2):
- 25≦ETa≦55 (1)
- 90≦SDa<99 (2),
- the thermoplastic resin (B) comprises a carbon-carbon double bond which does not encompass multiple bonds contained in aromatic rings, and
- the transition metal salt (C) is contained in a ratio of 1 to 5000 ppm in terms of metal element, based on a total weight of the ethylene-vinyl alcohol copolymer (A) and the thermoplastic resin (B).
A resin composition comprising ethylene-vinyl alcohol copolymer (A), a thermoplastic resin (B) other than the ethylene-vinyl alcohol copolymer (A), and a transition metal salt (C), wherein
- the ethylene-vinyl alcohol copolymer (A) is contained in an amount of 70 to 99.9% by weight and the thermoplastic resin (B) is contained in an amount of 0.1 to 30% by weight,
- the ethylene-vinyl alcohol copolymer (A) comprises at least two kinds of ethylene-vinyl alcohol copolymers (a1) and (a2), ethylene contents ETa1(mol %) and ETa2(mol %) and degrees of saponification SDa1(%) and SDa2(%) of the ethylene-vinyl alcohol copolymers (a1) and (a2), respectively, satisfy the following equations (3) to (6):
- 25≦ETa1≦55 (3)
- 90≦SDa1<99 (4)
- 25≦ETa2≦55 (5)
- 99≦SDa2 (6),
- a weight ratio (a1/a 2) of the ethylene-vinyl alcohol copolymers (a1) and (a2) is 5/95 to 95/5,
- the thermoplastic resin (B) comprises a carbon-carbon double bond which does not encompass multiple bonds contained in aromatic rings, and
- the transition metal salt (C) is contained in a ratio of 1 to 5000 ppm in terms of metal element, based on a total weight of the ethylene-vinyl alcohol copolymer (A) and the thermoplastic resin (B).
A resin composition comprising ethylene-vinyl alcohol copolymer (A), a thermoplastic resin (B) other than the ethylene-vinyl alcohol copolymer (A), and a transition metal salt (C), wherein
- the ethylene-vinyl alcohol copolymer (A) is contained in an amount of 70 to 99.9% by weight and the thermoplastic resin (B) is contained in an amount of 0.1 to 30% by weight,
- the ethylene-vinyl alcohol copolymer (A) comprises at least two kinds of ethylene-vinyl alcohol copolymers (a1) and (a2),
- ethylene contents ETa1 (mol %) and ETa2 (mol %) and degrees of saponification SDa1(%) and SDa2(%) of the ethylene-vinyl alcohol copolymers (a1) and (a2), respectively, satisfy the following equations (3) to (6):
- 25≦ETa1≦55 (3)
- 90≦SDa1<99 (4)
- 25≦ETa2≦55 (5)
- 99≦SDa2 (6),
- a weight ratio (a1/a 2) of the ethylene-vinyl alcohol copolymers (a1) and (a2) is 5/95 to 95/5,
- the thermoplastic resin (B) comprises a carbon-carbon double bond which does not encompass multiple bonds contained in aromatic rings,
- the transition metal salt (C) is contained in a ratio of 1 to 5000 ppm in terms of metal element, based on a total weight of the ethylene-vinyl alcohol copolymer (A) and the thermoplastic resin (B), and
- an oxygen absorption rate of the resin composition is 0.01 ml/m2 ·day or more.
Dependencies are inferred from the claim text.