Preform for biaxial stretching blow molding, and container

A preform shaped by direct blow molding for biaxial stretching blow molding into a container using a pressurizing liquid medium, the preform comprising:

• a closed end generally cylindrical body having at least one layer thereof being constituted of one of a polyethylene resin having an MFR of 1.0 to 1.5 g/10 min. and polypropylene resin having an MFR of 0.8 to 2.3 g/10 min.;
• the body having an inner layer configured of an ethylene vinyl alcohol copolymer resin inside an outer layer of the one the polyethylene resin and polypropylene resin;
• and
• an innermost layer configured of a modified polyolefin resin inside the inner layer.

A method of forming a container from a preform, the method comprising:

• extruding a resin tube structure, the resin being one of a polyethylene resin having an MFR of 1.0 to 1.5 g/10 min. and polypropylene resin having an MFR of 0.8 to 2.3 g/10 min.;
• forming a preform from the tube structure by direct blow molding using pressurized air as the blowing medium, the preform having a closed end generally cylindrical body;
• forming a container from the preform by biaxial stretching blow molding the preform into the container using a pressurizing liquid as the blowing medium;
• and
• the extruding step including extruding the tube structure as multilayer structure, wherein the multilayer structure an inner layer configured of an ethylene vinyl alcohol copolymer resin inside an outer layer configured of one of the polyethylene resin and the polypropylene resin, the multilayer structure further including a band shaped adhesive layer configured of a modified polyolefin resin and extending in the axial direction between the outer layer and the inner layer.