Stain-proofing agent for preventing adherence of stain

A stain-proofing agent comprising, an organometallic compound represented by the formula (1):

• XbM(OR1)aR2c (1)
• wherein
• a is 0 or an integer of 1 to 6, b is 0 or an integer of 1 to 5, c is 0 or an integer of 1 to 6, provided that a+b+c≧3, a and c are not zero at the same time,
• X are the same or different, and each is hydrogen atom or a monovalent organic group which has 1 to 5,000 carbon atoms and may contain oxygen atom, nitrogen atom, fluorine atom and/or chlorine atom,
• M is a metal atom having at least three valences,
• R1 are the same or different, and each is hydrogen atom, a siloxane residue or a monovalent organic group which has 1 to 1,000 carbon atoms and may contain oxygen atom, nitrogen atom, fluorine atom and/or chlorine atom,
• R2 are the same or different, and each is an organic group which has 1 to 20 carbon atoms, has a chelating ability and may contain oxygen atom, nitrogen atom, fluorine atom and/or chlorine atom;
• an oligomer thereof;
• or
• a cooligomer comprising two or more of said organometallic compounds;
• provided that said stain-proofing agent excludes a stain-proofing agent comprising a compound represented by the formula (2):
• 24
• wherein n is an integer of 1 to 20, all of R15 are different or at least two of R15 are the same, each is a monovalent organic group which has 1 to 1,000 carbon atoms and may contain oxygen atom, nitrogen atom and/or silicon atom and a part or the whole of hydrogen atoms of said organic group may be substituted by fluorine atom or fluorine atom and chlorine atom.