| 摘要 |
<p>PURPOSE:To obtain a heat resistant hollow vessel having a pearl-like surface gloss which has specific hot-water shrinkage factor by blow molding a composition in which the ratio of polyethylene terephthalate to methacrylic resin is specified. CONSTITUTION:Methacrylic resin to be used is mixed in a range of 1-20wt.% in polyethylene terephthalate resin. If it exceeds this range, its pearl-like surface gloss is scarcely generated, while if it exceeds 20wt.% or more, the mechanical properties of the obtained hollow vessel and particularly dropping impact strength is reduced. A preform is obtained by drying a composition composed of polyethylene terephthalate and methacrylic resin so that its water content is reduced to less than 0.01%, and then molding it by a normal injection or extrusion molding method. The vessel is obtained by blow molding the preform in a blowing mold heated to 120-190 deg.C, and its hot-water shrinkage factor is 3% or less.</p> |
