| abstract |
(57) [Summary] A unit represented by the following chemical formula 1 is 0.01 to A vinyl alcohol polymer containing 30 mol%. Embedded image (Where R 1 , R 2 , R 3 , R 4 and R 5 represent a hydrogen atom or a hydrocarbon group having 8 or less carbon atoms which may have a substituent, and A represents a nitrogen atom, an oxygen atom or According to the present invention, a divalent hydrocarbon group which may contain a sulfur atom is represented, S represents a sulfur atom, and X represents a monovalent group containing an amino acid group. The present invention provides a vinyl alcohol-based polymer containing an amino acid group excellent in the above. |