# US 12,759,255 B2 · Multilayered container and method for producing same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,759,255 B2 - Document ID: US12759255B2 - Status: Granted - Kind: B2 - Application number: 18/209,059 - Filed: 2023-06-13 - Published: 2023-10-12 - Granted: 2026-10-13 - Earliest claimed: 2019-12-19 - Assignees: Mitsubishi Gas Chemical Company, Inc. - Applicants: Mitsubishi Gas Chemical Company, Inc. - Inventors: Takanori Miyabe - Web page: https://patentgrep.com/patent/US12759255B2 ## CPC - B32B 1/00: Layered products having a non-planar shape - B29C 49/06: Injection blow-moulding - B29C 49/12: Stretching rods - B29C 49/78: Measuring, controlling or regulating - B32B 27/08: of synthetic resin - B32B 27/34: comprising polyamides - B32B 27/36: comprising polyesters - B65D 1/0215: {multilayered (B65D81/3837 takes precedence)} - C08G 63/12: derived from polycarboxylic acids and polyhydroxy compounds - C08G 63/183: Terephthalic acids - C08G 69/26: derived from polyamines and polycarboxylic acids - B29C 2949/3032: having components being injected - B29K 2067/00: Use of polyesters {or derivatives thereof}, as moulding material - B29K 2077/00: Use of {PA, i.e.} polyamides, e.g. polyesteramides {or derivatives thereof}, as moulding material - B29L 2031/7158: {Bottles} - B32B 2439/60: Bottles - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00) - B65D: CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES - C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS - B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS - B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES ## Abstract A multilayer container having a polyester layer comprising a thermoplastic polyester resin (X) and a polyamide layer comprising a polyamide resin (Y), wherein the polyester layer is an innermost layer and the polyamide layer is an interlayer, and the polyamide resin (Y) comprises a polyamide resin (Y-1) comprising a structural unit derived from a diamine and a structural unit derived from a dicarboxylic acid, 70 mol % or more of the structural unit derived from a diamine being a structural unit derived from xylylenediamine; and 70 mol % or more of the structural unit derived from a dicarboxylic acid being a structural unit derived from an α,ω-linear aliphatic dicarboxylic acid having 4 to 20 carbon atoms, and wherein a stretching ratio in a transverse direction (TD) is 2.2 times or more, and a stretching ratio in a machine direction (MD) to the stretching ratio in the transverse direction (TD) (MD/TD) is 0.6 or more and less than 1.0. ## Claims ### Claim 1 A multilayer container comprising a polyester layer comprising a thermoplastic polyester resin (X) and a polyamide layer comprising a polyamide resin (Y), wherein the polyester layer is an innermost layer and the polyamide layer is an interlayer, and the polyamide resin (Y) comprises a polyamide resin (Y-1) comprising a structural unit derived from a diamine and a structural unit derived from a dicarboxylic acid, 70 mol % or more of the structural unit derived from a diamine being a structural unit derived from xylylenediamine; and 70 mol % or more of the structural unit derived from a dicarboxylic acid being a structural unit derived from an α, ω-linear aliphatic dicarboxylic acid having 4 to 20 carbon atoms, and wherein a stretching ratio in a transverse direction (TD) is 2.2 times or more, and a stretching ratio in a machine direction (MD) to the stretching ratio in the transverse direction (TD) (MD/TD) is 0.6 or more and less than 1.0, and wherein the multilayer container has a capacity of 200 to 350 mL, wherein the multilayer container has a three-layer structure of a polyester layer as an innermost layer and an outermost layer and a polyamide layer as an interlayer, and wherein, when the total thickness of the multilayer container is taken as 100%, the polyamide layer is at a position 5.5 to 20% from the inner surface of the multilayer container. ### Claim 2 (depends on 1) The multilayer container according to claim 1, wherein the multilayer container has a total thickness of 50 to 500 μm. ### Claim 3 (depends on 1) The multilayer container according to claim 1, wherein the thermoplastic polyester resin (X) comprises a thermoplastic polyester resin (X-1) comprising a structural unit derived from a dicarboxylic acid and a structural unit derived from a diol, 50 mol % or more of the structural unit derived from a dicarboxylic acid being a structural unit derived from terephthalic acid; and 50 mol % or more of the structural unit derived from a diol being a structural unit derived from ethylene glycol. ### Claim 4 (depends on 3) The multilayer container according to claim 3, wherein the thermoplastic polyester resin (X-1) comprises a structural unit derived from a dicarboxylic acid and a structural unit derived from a diol, 90 mol % or more of the structural unit derived from a dicarboxylic acid being a structural unit derived from terephthalic acid; and 90 mol % or more of the structural unit derived from a diol being a structural unit derived from ethylene glycol. ### Claim 5 (depends on 1) The multilayer container according to claim 1, wherein the polyamide resin (Y-1) comprises a structural unit derived from a diamine and a structural unit derived from a dicarboxylic acid, 80 mol % or more of the structural unit derived from a diamine being a structural unit derived from xylylenediamine; and 80 mol % or more of the structural unit derived from a dicarboxylic acid being a structural unit derived from adipic acid. ### Claim 6 (depends on 1) The multilayer container according to claim 1, wherein an intrinsic viscosity of the thermoplastic polyester resin (X) is 0.5 to 2.0 dL/g. ### Claim 7 (depends on 1) The multilayer container according to claim 1, wherein the stretching ratio in a transverse direction (TD) is from 2.3 to 3.9 times. ### Claim 8 (depends on 1) The multilayer container according to claim 1, wherein the stretching ratio in the machine direction (MD) to the stretching ratio in the transverse direction (TD) (MD/TD) is 0.6 or more and less than 0.90. ### Claim 9 (depends on 1) The multilayer container according to claim 1, wherein the stretching ratio in a transverse direction (TD) is from 2.3 to 3.9 times, and the stretching ratio in the machine direction (MD) to the stretching ratio in the transverse direction (TD) (MD/TD) is 0.6 or more and less than 0.90. ### Claim 10 (depends on 9) The multilayer container according to claim 9, wherein, when the total thickness of the multilayer container is taken as 100%, the polyamide layer is at a position 12 to 20% from the inner surface of the multilayer container. ### Claim 11 (depends on 10) The multilayer container according to claim 10, wherein, when the total thickness of the multilayer container is taken as 100%, the thickness of the polyamide layer of the multilayer container of the present invention is from 1% to 15%. ### Claim 12 (depends on 10) The multilayer container according to claim 10, wherein the multilayer container has a capacity of 200 to 330 mL. ### Claim 13 (depends on 9) The multilayer container according to claim 9, wherein the multilayer container has a capacity of 200 to 330 mL. ### Claim 14 (depends on 1) The multilayer container according to claim 1, wherein the stretching ratio in a transverse direction (TD) is from 2.6 to 3.9 times, wherein the stretching ratio in the machine direction (MD) to the stretching ratio in the transverse direction (TD) (MD/TD) is 0.6 or more and less than 0.80, wherein, when the total thickness of the multilayer container is taken as 100%, the polyamide layer is at a position 5.5 to 20% from the inner surface of the multilayer container, and wherein the multilayer container has a capacity of 200 to 330 mL. ### Claim 15 (depends on 1) The multilayer container according to claim 1, wherein an oxygen barrier property of the container (mL/bottle·day·0.21 atm) is 0.015 or less. ### Claim 16 (depends on 1) The multilayer container according to claim 1, wherein, when the total thickness of the multilayer container is taken as 100%, the polyamide layer is at a position 12 to 20% from the inner surface of the multilayer container. ### Claim 17 (depends on 1) The multilayer container according to claim 1, wherein, when the total thickness of the multilayer container is taken as 100%, the thickness of the polyamide layer of the multilayer container is from 1% to 15%.