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

Abstract

A surface modifying composition for modifying a surface of a formed product made of high-density polyethylene or ultra-high molecular weight polyethylene, the composition comprising: a copolymer having a unit of a first monomer having an aliphatic group having 10 or more carbon atoms and a unit of a second monomer having any of an amino group, an epoxy group, and an ether group, and a solvent having a boiling point of 100° C. or more and being at least one selected from the group consisting of a halogen-based solvent, an alkane solvent, a cycloalkane solvent, a dicycloalkane solvent, an aromatic solvent, and a nitro-based solvent.

1 . A surface modifying composition for modifying a surface of a formed product made of high-density polyethylene or ultra-high molecular weight polyethylene, the composition comprising:
 a copolymer having a unit of a first monomer having an aliphatic group having 10 or more carbon atoms and a unit of a second monomer having any of an amino group, an epoxy group, and an ether group, and   a solvent having a boiling point of 100° C. or more and being at least one selected from the group consisting of a halogen-based solvent, an alkane solvent, a cycloalkane solvent, a dicycloalkane solvent, an aromatic solvent, and a nitro-based solvent.   
     
     
         2 . The surface modifying composition according to  claim 1 , wherein the first monomer constituting the copolymer comprises one or more selected from the group consisting of behenyl acrylate, behenyl methacrylate, stearyl acrylate, stearyl methacrylate, hexadecyl acrylate, hexadecyl methacrylate, lauryl acrylate, and lauryl methacrylate. 
     
     
         3 . The surface modifying composition according to  claim 1 , wherein the second monomer constituting the copolymer comprises one or more selected from the group consisting of 2-(dimethylamino)ethyl acrylate, 2-(dimethylamino)ethyl methacrylate, 2-(diethylamino)ethyl acrylate, 2-(diethylamino)ethyl methacrylate, 2-(tert-butylamino)ethyl acrylate, 2-(tert-butylamino)ethyl methacrylate, N,N-dimethylacrylamide, N,N-diethylacrylamide, and N,N-dimethylaminopropyl acrylamide. 
     
     
         4 . The surface modifying composition according to  claim 1 , wherein
 the copolymer is a block copolymer, and   a weight average molecular weight of a block of the first monomer is 2000 or more.   
     
     
         5 . A modified product comprising a formed product made of high-density polyethylene or ultra-high molecular weight polyethylene, and a copolymer bound to the formed product,
 wherein the copolymer has a unit of a first monomer having an aliphatic group having 10 or more carbon atoms and a unit of a second monomer having any of an amino group, an epoxy group, and an ether group, and   the copolymer is not separated from the formed product when left in water at 80° C. and in ethanol at 70° C. under the condition of 1 hour.   
     
     
         6 . A method of producing a modified product comprising:
 a contacting step of warming a surface modifying composition to a temperature T 1 , the surface modifying composition comprising a copolymer having a unit of a first monomer having an aliphatic group having 10 or more carbon atoms and a unit of a second monomer having any of an amino group, an epoxy group, and an ether group, and a solvent, and bringing the surface modifying composition into contact with a surface of a formed product made of high-density polyethylene or ultra-high molecular weight polyethylene; and   a cooling step of lowering the temperature of the surface modifying composition from T 1  to T 2 , wherein   T 1  is a temperature 60° C. lower than the melting point Tm of the polyethylene constituting the formed product (Tm−60) or more, and   T 2  is a temperature 80° C. lower than the melting point Tm of the polyethylene (Tm−80) or less.   
     
     
         7 . A method of producing a colored product, comprising a coloring step of attaching an ink containing a dye or a pigment to the modified surface of the modified product obtained by the method of producing a modified product according to  claim 6 .