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AssigneeKureha Corporation
InventorsTakashi Sato, Satoru Suzuki, Daisuke Itoh
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A multilayer blow molded container having a layer structure that a polyglycolic acid layer is provided as a core layer, and thermoplastic polyester resin layers are arranged as inner and outer layers, wherein the melt viscosity x of a polyglycolic acid forming the polyglycolic acid layer is 300 to 900 Pa·s as measured at a temperature of 270° C. and a shear rate of 122 sec−1, the melt viscosity y of a thermoplastic polyester resin forming the thermoplastic polyester resin layers is 250 to 600 Pa·s as measured at a temperature of 290° C. and a shear rate of 122 sec−1, and a melt viscosity ratio x/y between both melt viscosities is 0.85 to 1.80, and a production process thereof.
A multilayer blow molded container having a layer structure that a polyglycolic acid layer is provided as a core layer, and thermoplastic polyester resin layers are arranged as inner and outer layers, wherein the melt viscosity x of a polyglycolic acid forming the polyglycolic acid layer is 300 to 900 Pa·s as measured at a temperature of 270° C. and a shear rate of 122 sec−1, the melt viscosity y of a thermoplastic polyester resin forming the thermoplastic polyester resin layers is 250 to 600 Pa·s as measured at a temperature of 290° C. and a shear rate of 122 sec−1, and a melt viscosity ratio x/y between both melt viscosities is 0.85 to 1.80.
A process for producing a multilayer blow molded container, which comprises co-injection molding a polyglycolic acid and a thermoplastic polyester resin to form a bottomed multilayer preform having a layer structure that a polyglycolic acid layer is provided as a core layer, and thermoplastic polyester resin layers are arranged as inner and outer layers, and then subjecting the multilayer preform to stretch blow molding, wherein the melt viscosity x of the polyglycolic acid is 300 to 900 Pa·s as measured at a temperature of 270° C. and a shear rate of 122 sec−1, the melt viscosity y of the thermoplastic polyester resin is 250 to 600 Pa·s as measured at a temperature of 290° C. and a shear rate of 122 sec1, and a melt viscosity ratio x/y between both melt viscosities is 0.85 to 1.80.
Dependencies are inferred from the claim text.