a polypropylene pp container 40 shown in fig9 a with the above hydrophilicization treatment solution a small quantity of the hydrophilicization treatment solution prepared was put in the pp container of 50 ml in inner volume to wet the container inner surfaces with the hydrophilicization treatment solution the container was turned upside down and shaken after the inner surfaces were uniformly wetted to release the surplus solution the container whose inner surfaces were wetted with the coating film 48 of the hydrophilicization treatment solution was dried in an oven at 60 u00b0 c for 1 hour this produced the hydrophilicization treated pp container 40 a shown in fig9 b the three types of solutions having the following compositions were prepared and the treatment was attempted for the inner wall surfaces of a polypropylene pp container with each of these solutions to verify the hydrophilicization treatment effects brought by the present invention comparative example 1 used the hydrophilicization treatment solution composition shown in table 1 except that it comprised only isopropyl alcohol and sulfuric acid in other words the solution for comparative example 1 was free of polyoxyalkylene poly dimethyl siloxane which was used to form the desired polymer coating film by the present invention comparative example 2 used the hydrophilicization treatment solution composition shown in table 1 except that it comprised only isopropyl alcohol and polyoxyalkylene poly dimethyl siloxane in other words the solution for comparative example 2 was free of concentrated sulfuric acid and a small quantity of the water molecules associated therewith comparative example 3 used the hydrophilicization treatment solution composition shown in table 1 except that isopropyl alcohol was replaced by hexane which is a bad solvent for polyoxyalkylene poly dimethyl siloxane a.