Water repellent composition, its production method, hydrophobic substrate treating agent composition and article

A hydrophobic substrate treating agent composition, which comprises the water repellent composition, a penetrant, and an antistatic agent, wherein said water repellent composition to be used for treatment of a hydrophobic substrate, which comprises a fluorinated copolymer having structural units based on the following monomer (a), structural units based on the following monomer (b) and structural units based on the following monomer (c), and a medium,

• wherein the proportion of the structural units based on the monomer (a) is from 50 to 90 mass % of the structural units (100 mass %) based on all the monomers:
• monomer (a):
• a compound represented by the following formula (1):
• (Z—Y)nX (1)
• wherein Z is a C1-6 polyfluoroalkyl group or a group represented by the following formula (2), Y is a bivalent organic group or a single bond, n is 1 or 2, and X is, when n is 1, any one of the groups represented by the following formulae (3-1) to (3-5) and, when n is 2, any one of the groups represented by the following formulae (4-1) to (4-4):
• CiF2i+1O(CFX1CF2O)jCFX2— (2)
• wherein i is an integer of from 1 to 6, j is an integer of from 0 to 10, and each of X1 and X2 is a fluorine atom or a trifluoromethyl group;
• —CR═CH2 (3-1)
• —C(O)OCR═CH2 (3-2)
• —OC(O)CR═CH2 (3-3)
• —OCH2-φ-CR═CH2 (3-4)
• —OCH═CH2 (3-5)
• wherein R is a hydrogen atom, a methyl group or a halogen atom, and φ is a phenylene group;
• —CH[—(CH2)mCR═CH2]— (4-1)
• —CH[—(CH2)mC(O)OCR═CH2]— (4-2)
• —CH[—(CH2)mOC(O)CR═CH2]— (4-3)
• —OC(O)CH═CHC(O)O— (4-4)
• where R is a hydrogen atom, a methyl group or a halogen atom, and m is an integer of from 0 to 4;
• monomer (b):
• a (meth)acrylate having no polyfluoroalkyl group and having a C1-6 alkyl group;
• monomer (c):
• a halogenated olefin.