PRODUCTION OF STRETCH BLOW-MOLDED MULTILAYER BOTTLE AND STRETCH BLOW-MOLDED MULTILAYER BOTTLE

摘要

PROBLEM TO BE SOLVED: To obtain a stretch blow-molded multilayer aromatic polycarbonate bottle having uniform wall thickness and good impact resistance. SOLUTION: In a method for producing a stretch blow-molded multilayer bottle, when the melt viscosities of a resin A which forms an inner layer and a resin B which forms an outer layer at 320 deg.C and at shear rate 10 sec-1 are expressed byηA(10) andηB(10) respectively, and the melt viscosities of the resin A and the resin B at 320 deg.C and at shear rate 10,000 sec-1 are expressed byηA(10,000) andηB(10,000) respectively, in a preform,α=ηA(10)/ηA(10,000) is 1.1-5,β=ηB(10)/ηB(10,000) is 3.2-30, andγ=β-αis at lest 2, and the ratio of the thickness of the inner layer to the thickness of the outer layer is 0.2-5.