Fluoropolyether-containing polymer-modified silane, surface treating agent, and treated article

A fluoropolyether-containing polymer-modified silane having general formula (1)

• wherein Rf is a monovalent fluorooxyalkyl or divalent fluorooxyalkylene-containing polymer residue,
• Y is at least one of divalent to tetravalent groups being selected from the following formulae:
• —CH2CH2CH2—,
• —CH2CH2CH2CH2—,
• —CH2CH2CH2CH2CH2—,
• —CH2CH2CH2CH2CH2CH2—,
• W is at least one of divalent to tetravalent groups being selected from the following formulae:
• —CH2CH2—,
• —CH2CH2CH2—,
• —CH2CH2CH2CH2—,
• —CH2CH2CH2CH2CH2—,
• —CH2CH2CH2CH2CH2CH2—,
• R is independently an alkyl group of 1 to 4 carbon atoms or a phenyl group,
• each X is independently selected from the group consisting of hydroxyl, alkoxy groups of 1 to 10 carbon atoms, alkoxyalkoxy groups of 2 to 10 carbon atoms, acyloxy groups of 1 to 10 carbon atoms, alkenyloxy groups of 2 to 10 carbon atoms, and halogen groups,
• n is an integer from 1 to 3,
• a is an integer from 1 to 3,
• m is an integer from 1 to 3, and
• α is 1 or 2.