초록 ▼

A laminated plastic molded body of the present invention comprises a laminated plastic molded body having a layered structure portion of three-layers or five-layers in which a resin layer A and a resin layer B are alternatively laminated, wherein the resin layer A provided at least at the surface si

A laminated plastic molded body of the present invention comprises a laminated plastic molded body having a layered structure portion of three-layers or five-layers in which a resin layer A and a resin layer B are alternatively laminated, wherein the resin layer A provided at least at the surface side of the layered structure portion is a mixed resin layer of a poly(ethylene terephthalate) resin and at least one resin selected from the group consisting of an amorphous polyester resin, an ethylene naphthalate-ethylene terephthalate copolymer resin and a meta-xylene group-containing polyamide resin, and the resin layer B interposed between the resin layers A is a barrier resin layer comprising at least one resin selected from the group consisting of a meta-xylene group-containing polyamide resin and an ethylene-vinyl alcohol copolymer resin. Thus, a multi-layer laminated plastic container having highly gas barrier properties against oxygen and carbon dioxide gases, and yet transparency, excellent characteristics in mechanical properties, and having food hygiene properties can be provided.

대표청구항 ▼

1. A laminated plastic molded body having a layered structure portion of three-layers or five-layers in which a resin layer A and a resin layer B are alternatively laminated, wherein:the resin layer A provided at least at the surface side of the layered structure portion is a mixed resin layer of a

1. A laminated plastic molded body having a layered structure portion of three-layers or five-layers in which a resin layer A and a resin layer B are alternatively laminated, wherein:the resin layer A provided at least at the surface side of the layered structure portion is a mixed resin layer of a poly(ethylene terephthalate) resin and at least one additional resin selected from the group consisting of an amorphous polyester resin, an ethylene naphthalate-ethylene terephthalate copolymer resin and a meta-xylene group-containing polyamide resin, said mixed resin layer containing said at least one additional resin in an amount of 5 to 45% by weight, andthe resin layer B interposed between the resin layers A is a barrier resin layer comprising at least one resin selected from the group consisting of a meta-xylene group-containing polyamide resin and an ethylene-vinyl alcohol copolymer resin. 2. A laminated plastic molded body according to claim 1, wherein the poly(ethylene terephthalate) resin is a resin in which 80 mol % or more of a dicarboxylic acid component constituting the polymer is a terephthalic acid unit, and 80 mol % or more of a dialcohol component constituting the polymer is an ethylene glycol unit. 3. A laminated plastic molded body according to claim 2, wherein 90 mol % or more of the dicarboxylic acid component is a terephthalic acid unit, and 90 mol % or more of the dialcohol component is an ethylene glycol unit. 4. A laminated plastic molded body according to claim 1, wherein the amorphous polyester resin is an amorphous polyester resin obtained by copolymerizing at least one copolymer component selected from the group consisting of isophthalic acid, diphenyl ether 4,4-dicarboxylic acid, naphthalene-1,4-dicarboxylic acid, naphthalene-2,6-dicarboxylic acid, adipic acid, sebacic acid, decan-1,10-dicarboxylic acid, hexahydroterephthalic acid, propylene glycol, 1,4-butanediol, neopentyl glycol, diethylene glycol, 1,4-cyclohexanedimethanol, 2,2-bis(4-hydroxyphenyl)propane and 2,2-bis(4-hydroxyethoxyphenyl)propane, in addition to terephthalic acid and ethylene glycol. 5. A laminated plastic molded body according to claim 1, wherein the ethylene naphthalate-ethylene terephthalate copolymer resin is a copolymer resin containing 5 to 45 mol % of an ethylene naphthalate unit and 95 to 55 mol % of an ethylene terephthalate unit. 6. A laminated plastic molded body according to claim 1, wherein the meta-xylene group-containing polyamide resin is a polyamide resin comprising a polymer containing 70 mol % or more of an amide unit obtained from meta-xylylene diamine alone, or a mixed xylylenediamine containing meta-xylylenediamine and 30 mol % or less of paraxylylenediamine based on the total xylylenediamine and α·ω-aliphatic dicarboxylic acid having 6 to 10 carbon atoms. 7. A laminated plastic molded body according to claim 1, wherein said amount is 5 to 20% by weight. 8. A laminated plastic molded body according to claim 1, wherein the weight of the resin forming the resin layer B is 2 to 25% based on the weight of the resin forming the resin layer A and the resin layer B. 9. A laminated plastic molded body according to claim 1, wherein the laminated plastic molded body is a container. 10. A laminated plastic molded body according to claim 9, wherein at least a trunk portion and a bottom portion of the container are constituted by the layered portion. 11. A laminated plastic molded body according to claim 1, wherein said layered structure portion has three alternating layers of said resin A and said resin B. 12. A laminated plastic molded body according to claim 1, wherein said layered structure portion has five alternating layers of said resin A and said resin B.