A
hair treatment agent, a
shampoo or a hair coloring agent comprising a silylated
peptide-
silane compound
copolymer composition which is produced by the following process and has
viscosity in a range from 500 to 20000 mPa.s in 70% of
solid content concentration of said
copolymer composition at 20° C., wherein said process comprises: polycondensing one or more kind selected from silylated peptides represented by the general formula (I) with one or more kind selected from
silane compounds represented by the general formula (II) in an
aqueous solution in a range of reaction
molar ratio of said silylated
peptide to said
silane compound from 1:1 to 1:100 to form a polycondensed
polymer, and then adding by
addition reaction a silane compound represented by the general formula (III) in an
aqueous solution to said polycondensed
polymer; wherein said silylated
peptide represented by the following general formula (I) is , in which R<1 >represents a
hydroxy group etc., R<2 >represents a residual group of a
side chain obtained by removing the terminal end amino group of a basic
amino acid having an amino group at the end of a
side chain, R<3 >represents a
side chain of an
amino acid other than R<2>, A is a connecting
moiety, and x is from 0 to 50, y to from 1 to 100 and x+y is from 1 to 100; wherein said silane compound represented by the following general formula (II) is R<4>mSi(OH)pY(4-p-m) (II) , in which m represents an integer from 0 to 2, p represents an integer from 2 to 4, m+p is not more than 4, R<4 >represents an
organic group; and wherein silane compound represented by the following general formula (III) is R<5>3Si(OH) (III) , wherein three R<5>s represent organic groups.