Hydrophilic copolymer and coating composition comprising the same and antifog use thereof

A hydrophilic copolymer comprising:

• a first repeating unit represented by general formula (1):
• and
• a second repeating unit represented by general formula (2):
• and optionally,
• a third repeating unit represented by general formula (3):
• wherein
• R1, R2, R3, R4, R5, R6, R7, R8 and R9 are each independently selected from a hydrogen atom, or a monovalent hydrocarbon group having 1 to about 16 carbon atoms and optionally containing a heteroatom;
• X is a monovalent siloxy-containing group represented by -(LF)m-L1-Si(OR11)a(R12)3-a,
• Y is a monovalent hydrophilic group represented by -(LF)m-(L2), —C(O)—N(R21)(R22), and
• Z is a monovalent organic group represented by -(LF)m-(L3)n-C(O)-L4-R31,
• where
• each occurrence of LF independently represents a divalent organic group selected from —O—, —N(R)—, —C(O)—, —OC(O)—, —C(O)O—, —N(R)C(O)—, —C(O)N(R)—, —N(R)C(O)O— or —OC(O)N(R)—, where R represents a hydrogen atom, or an alkyl group having 1 to about 6 carbon atoms;
• each occurrence of L1, L2 and L3 independently represents a substituted or un-substituted divalent hydrocarbon group having 1 to about 20 carbon atoms and optionally containing a heteroatom;
• L4 is selected from an oxygen atom or a sulfur atom;
• R11 is each independently an alkyl group having 1 to about 12 carbon atoms;
• R12 is each independently a monovalent hydrocarbon group having 1 to about 16 carbon atoms and optionally containing a heteroatom;
• R21 and R22 are each independently selected from a hydrogen atom, or a monovalent hydrocarbon group having 1 to about 16 carbon atoms and optionally containing a heteroatom;
• R31 is selected from a hydrogen atom, or a monovalent hydrocarbon group having 1 to about 16 carbon atoms which optionally contains one or more functional groups selected from a hydroxyl, a mercapto, an ether, an ester, an amine, or a carboxyl group;
• each occurrence of subscripts m and n is independently 0 or 1;
• and
• subscript a is 1, 2 or 3.