Plastic container comprising cyclic polyolefin layer

A plastic container containing a solution comprising, as an active ingredient, 3-methyl-1-phenyl-2-pyrazolin-5-one, wherein the container comprises:

• a multilayered film having six or more layers, wherein the six or more layers are:
• an innermost heat-sealable seal layer consisting essentially of polypropylene,
• a first resin composition layer disposed on the innermost heat-sealable seal layer consisting essentially of a resin composition comprising a blended product of a propylene polymer and a styrene elastomer,
• a cyclic polyolefin barrier layer disposed on the first resin composition layer consisting of a polymer consisting of repeating units represented by the formula (1) and repeating units represented by the formula (1′):
• wherein each of Ra, Ra′, Rb and Rb′, identically or differently, represents a hydrogen, a hydrocarbon residue, a halogen, an ester, a nitrile or a pyridyl;
• or Ra and Rb may bind to one another to form a ring;
• or Ra′ and Rb′ may bind to one another to form a ring;
• each of m and m′ represents an integer of 1 or greater;
• and each of n and n′ represents an integer of 0 or 1 or greater,
• two or more additional resin composition layers disposed on the cyclic polyolefin barrier layer consisting essentially of a resin composition comprising a blended product of a propylene polymer and a styrene elastomer,
• and
• an outermost layer disposed on the additional resin composition layers consisting essentially of a polypropylene layer;
• wherein the plastic container is molded by heat sealing peripheral portions of the multilayered films.