An object of the present invention is to provide an ethylene-.alpha.-olefin copolymer excellent in extrusion molding processability and in the balance between the appearance and impact strength. This object is achieved by a copolymer of ethylene and .alpha.-olefin of from 4 to 20 carbon atoms having melt flow rate (MFR; unit is g/10 minutes), melt tension at 190.degree. C. (MT; unit is cN), intrinsic viscosity ([.eta.]; unit is dl/g), the chain length A and characteristic relaxation time at 190.degree. C. (.tau.; unit is sec) which satisfy the specific relations.

 
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> Die assembly and method for forming honeycomb filters

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