Surface modifying composition, modified product, and method of producing modified product

A method of producing a modified product, the method comprising:

• a contacting step of warming a surface modifying composition to a temperature T1, the surface modifying composition comprising a block copolymer having a block of a first monomer having an aliphatic group having 10 or more carbon atoms and a weight average molecular weight of at least 2000, and a block of a second monomer having an amino group or an epoxy group, and a solvent and bringing the surface modifying composition into contact with a surface of a formed product made of a high-density polyethylene or an ultra-high molecular weight polyethylene;
• and
• a cooling step of lowering the temperature of the surface modifying composition from T1 to T2;
• wherein when the modified product is left in water at 80° C. and in ethanol at 70° C. for 1 hour, the block copolymer is not separated from the formed product, and
• wherein the solvent is one or more selected from the group consisting of an alkane solvent, a cycloalkane, a dicycloalkane, an aromatic solvent, and a nitro solvent, and
• wherein the solvent has a boiling point of 100° C. or more at atmospheric pressure;
• wherein T1 is a temperature from (Tm—60) to Tm, wherein (Tm—60) is a temperature 60° C. lower than Tm, and wherein Tm is the melting point of the polyethylene constituting the formed product, and
• wherein T2 is (Tm—80), wherein (Tm—80) is a temperature 80° C. lower than Tm.