Composition and method for forming coating film

A composition comprising an oily medium and at least one compound represented by following formula (Z):

• A-L-{D1-(E)q-D2-(B)m—Z1—R}p (Z)
• wherein
• A represents a p-valent chain or cyclic residue;
• L represents a single bond, an oxy group, a substituted or non-substituted oxymethylene group represented by following formula (A-a), or a substituted or nonsubstituted oxyethyleneoxy group represented by following formula (A-b):
• —(O—C(Alk)2)- (A-a)
• —(O—C(Alk)2C(Alk)2O)— (A-b)
• Alk represents a hydrogen atom, a C1-C6 alkyl group or a cycloalkyl group;
• p represents an integer of 2 or more;
• D1 represents a carbonyl group (—C(═O)—) or a sulfonyl group (—S(═O)2—), and each D1 may be the same as or different from every other D1;
• D2 represents a carbonyl group (—C(═O)—), a sulfonyl group (—S(═O)2—), a carboxyl group (—C(═O)O—), a sulfonyloxyl group (—S(═O)2O—), a carbamoyl group (—C(═O)N(Alk)-) or a sulfamoyl group (—S(═O)2N(Alk)-), and each D2 may be the same as or different from every other D2, wherein Alk represents a hydrogen atom, a C1-C6 alkyl group or a cycloalkyl group;
• E represents a substituted or nonsubstituted alkylene group, cycloalkylene group, alkenylene group, alkynylene group or arylene group, a divalent heterocyclic aromatic ring group or heterocyclic non-aromatic ring group, a divalent group selected among an imino group, an alkylimino group, an oxy group, a sulfide group, a sulfenyl group, a sulfonyl group, a phosphoryl group and an alkyl-substituted silyl group, or a divalent group composed of a combination of two or more of these groups;
• q represents an integer of 0 or more;
• and when q is 2 or more, each E may be the same as or different from every other E;
• R represents a substituted or non-substituted C8 or longer alkyl group, a perfluoroalkyl group or a trialkylsilyl group, and each R may be the same as or different from every other R;
• B varies depending upon R;
• in the case where R represents a substituted or non-substituted C8 or longer alkyl group, B represents a substituted or non-substituted oxyethylene group or a substituted or non-substituted oxypropylene group;
• plural Bs connecting to each other may be the same as or different from each other;
• and m represents a natural number of 1 or more;
• in the case where R represents a perfluoroalkyl group, B represents an oxyperfluoromethylene group, an oxyperfluoroethylene group or an optionally branched oxyperfluoropropylene group;
• plural Bs connecting to each other may be the same as or different from each other;
• and m represents a natural number of 1 or more;
• in the case where R represents a trialkylsilyl group, B represents a dialkylsiloxy group in which the alkyl group is selected among a methyl group, an ethyl group and an optionally branched propyl group;
• each B may be the same as or different from every other B;
• plural Bs connecting to each other may be the same as or different from each other;
• and m represents a natural number of 1 or more;
• and
• Z1 represents a single bond, a divalent group selected among a carbonyl group, a sulfonyl group, a phosphoryl group, an oxy group, a substituted or non-substituted amino group, a sulfide group, an alkenylene group, an alkynylene group and an arylene group or a divalent group composed of a combination of two or more of these groups.