TECHNOLOGY FOCUS - POLYMERS - Preferred Block: The charge transportable block different from charge transportable block adhered to base material surface is exposed. One of the charge transportable blocks is adhered with high strength on base material surface than other charge transportable block. Preferred Polymer: The polymer satisfies formula: ZA more than Z more than (ZA+ZB)/2 and ZB less than Z less than (ZA+ZB)/2, where Z is value of contact angle of polymeric film, ZA is largest value in contact angle of polymeric film containing at least one type of charge transportable block, and ZB is value of smallest contact angle. The number average molecular weight of polymer by polystyrene conversion is 103-108. At least one of charge transportable block of polymer has luminosity, electron transporting property and hole transporting property. The polymer is asymmetrical block copolymer. At least one of charge transportable block is polyarylene residue or aromatic polyamine residue. The weight concentration of nitrogen atom contained in polymer is 1% or more. Preferred Copolymer: The asymmetrical block copolymer contains a portion (A) containing one or more types of hole transportable block, and a portion (B) containing one or more electron transportable block connected directly or indirectly with portion (A). The asymmetrical block copolymer has structure of formula: -(Ar11)m11-(Ar12)m12-(Ar13)m13- to -(Ar power (n))mn, Rx-(Ar1)m1-(Ar2)m2-(Ar3)m3-Ry or Rp-(Ar4)m4-(Ar5)m5-Rq.Ar11-Ar power(n)=bivalent group of conjugated system in one charge transportable block optionally having substituent;n=12 or more;m11-mn=5 or more;Ar1-Ar5=bivalent group of conjugated system optionally having substituent, preferably Ar4 is polyarylene residue optionally having substituent and Ar5 is aromatic polyamine residue optionally having substituent;Rx,Ry,Rp,Rq=terminal group;m1-m3=0 or more, at two of m1-m3 is 5 or more;andm4,m5=5 or more.Charge transportable blocks are coupled directly or through a bonding group. When Ar2 has adhesion group, Rx,Ry,Ar1 and Ar3 do not have adhesion group. When Ar2 does not have adhesion group, at least one of Rx,Ry,Ar1 and Ar3 have adhesion group. Ar4,Rp,Ar5 or Rq has adhesion group. Preferred Residue: The polyarylene residue is polyfluorene diyl group optionally having substituent, or polybenzofluorene diyl group optionally having substituent. Preferred Method: The polymeric solution is applied on base material, and polymer is contacted with polymeric good solvent. EXAMPLE - 4-t-butyl bromobenzene (6.6 mg) and toluene (34 mL) were added to flask substituted with argon gas and stirred at 45degrees C for 5 minutes. Tris (dibenzylidene acetone) dipalladium (2.1 mg) and tris (2-methoxyphenyl) phosphine (6.5 mg) were added and stirred at 45degrees C for 5 minutes. 30 wt.% cesium carbonate aqueous solution (7 mL) was added and stirred at 45degrees C. The reaction solution was further stirred at 110degrees C for 2.5 hours. Brominated compound of formula (B) was obtained with number average molecular weight of 5.2x 104 by polystyrene conversion. Brominated compound of formula (B) (in g) (1), triphenyl amine of formula (C) (2.23), tris (dibenzylidene acetone) dipalladium (5.7 mg), tris (2-methoxyphenyl) phosphine (17.4 mg), 30 wt.% cesium carbonate aqueous solution (19 mL) and toluene (9 mL) were added and stirred at 110degrees C for 17 hours. 4-(4,4,5,5-tetramethyl-1,3,2-dioxa-borolan-2-yl) toluene (0.46) and toluene (2 mL) were added and stirred at 110degrees C for 3 hours. The reaction solution was cooled and organic layer and aqueous layer were separated. The organic layer was dripped into ethanol (375 mL) and precipitate was deposited. The precipitate was filtered and dried. Yellow solid was obtained. The yellow solid was dissolved in toluene (125 mL), concentrated and dried. The obtained solid was dissolved in tetrahydrofuran, solution was dripped in acetone and precipitate was deposited. The precipitate was filtered and dried, and further washed with toluene and methanol. Asymmetrical block copolymer (1.1) containing repeating unit of formula (A) and repeating unit of formula (B) in molar ratio of 32:68, and having number average molecular weight of 5.1x 104 and weight average molecular weight of 8.1x 104 by polystyrene conversion was obtained. Glass substrate was immersed in tetrahydrofuran solution of obtained copolymer, stood for three days, and toluene was blow-sprayed and washed. The glass substrate was exposed to ultraviolet ray and polymer adsorption film was formed.