Patent ID: 8529824

Claim:
A method for manufacturing a pressure-resistant container liner by a blow molding, comprising: a resin composition melting step of mixing 99 to 70 weight % of specific whole aromatic polyesteramide liquid crystal resin (A), the whole aromatic polyesteramide liquid crystal resin comprising repeating polymerization units of: (I) 1 to 15 mol % of 6-hydroxy-2-naphthoic acid residue, (II) 40 to 70 mol % of 4-hydroxy benzoic acid residue, (III) 5 to 28.5 mol % of aromatic diol residue, (IV) 1 to 20 mol % of 4-aminophenol residue, and (V) 6 to 29.5 mol % of aromatic dicarboxylic acid residue, with 1 to 30 weight % of epoxy modified polyolefin-base resin (B), with a total of the whole aromatic polyesteramide liquid crystal resin (A) and epoxy modified polyolefin-base resin (B) being 100 weight % of the resin composition, to form a resin composition by melting and kneading the whole aromatic polyesteramide liquid crystal resin and epoxy modified polyolefin-base resin, and of heating and melting the resin composition within a temperature range of a melting point to the melting point +40° C., the resin composition having a melt viscosity of 60 to 4000 Pas at a shear rate of 1000/second at a temperature which is 20° C. higher than the melting point and having a melt tension of 20 mN or more at a take-over speed of 14.8 m/minute; a parison forming step of extruding and forming a cylindrical parison with an extrusion speed equal to or higher than 0.3 kg/minute and lower than 5 kg/minute by using the specific resin composition melt in the resin composition melting step; a mold closing step of placing the parison formed in the parison forming step between a pair of molds forming a cylindrical cavity and of closing the molds, the pair of molds each comprising half of a two-stage pinch section provided in a wall of each mold such that when the pair of molds are closed there is formed at least one two-stage pinch section, comprising two pinch sections and a space between the two pinch sections, within one wall of the closed pair of molds; and a forming step of blowing gas into the parison in the molds closed in the mold closing step to form a liner.