| 摘要 |
PROBLEM TO BE SOLVED: To provide a preform made of a polyethylene material that exhibits both shear thinning characteristics for injection molding and strain hardening for stretch blow molding of an injection stretch blow molding process.SOLUTION: A solid preform made of a polyethylene material comprises a neck region, side walls and a base region, and has an interior having inner walls and an exterior having outer walls. At least 65 wt.% of the polyethylene material of the total polyethylene material has a Z-average molecular weight (Mz) of 300,000 to 6,000,000 g/mol, and a Mz/Mn value greater than 28, where Mn is the number average molecular weight. The polyethylene has a density of 0.926 to 0.960 g/cm. |
