Large blow moldings made from polyethylene

Abstract

Large blow moldings are made from polyethylene of density ρ≧0.94 g/cm 3 and of melt flow rate MFR 190/21.6<50 g/10 min, and of notched tensile impact strength a zK (−30° C.) not less than 300 kJ/m 2 and bursting strength, determined by a drop height test at −18° C., of more than 3 m. Processes for producing large blow moldings of this type involve annealing large blow moldings after production. The moldings are used for storage and transport of hazardous materials.

1 . A large blow molding made from polyethylene of density ρ≧0.94 g/cm 3  and of melt flow rate MFR 190/21.6<50 g/10 min, wherein the notched tensile impact strength a zK  (−30° C.), measured in accordance with ISO 8256, is not less than 300 kJ/m 2  and the bursting strength, determined by a drop hight test at −18° C. is more than 3 m.  
   
   
       2 . A large blow molding as claimed in  claim 1 , wherein the polyethylene has a weight-average molar mass M w  of from 200 to 800 kg/mol and a breadth of molar mass distribution M w /M n  of from 5 to 80.  
   
   
       3 . A large blow molding as claimed in  claim 1 , which is a cannister, tank, drum or intermediate bulk container.  
   
   
       4 . A large blow molding as claimed in  claim 3  which is an L-ring drum.  
   
   
       5 . (canceled)  
   
   
       6 . (canceled)  
   
   
       7 . (canceled)  
   
   
       8 . A method of storing or transporting a hazardous material which comprises storing or transporting the hazardous material in the large blow molding defined in  claim 1.