A composition comprising a polymer containing a compound represented by
Formula (1) or a salt thereof as a constituent monomer, or a polymer
containing a structure represented by Formula (9) as a partial structure
is used for protecting or improving skin.
##STR1##
In the formula, R1, R2 and R3 each independently represent hydrogen atom,
an alkyl group, an alkoxyl group, or an alkylamino group; R4 represents an
amino acid residue, a polyamine residue, or an aminoalcohol residue; and X
represents oxygen atom or a group represented as NH.
##STR2##
In the formula, R1, R2 and R3 each independently represent hydrogen atom,
an alkyl group, an alkoxyl group, or an alkylamino group; R4 represents an
amino acid residue, a polyamine residue, or an aminoalcohol residue; and X
represents oxygen atom or a group represented as NH.
