Daikin Kogyo Co., Ltd.

Masayuki Asaoka

Iwao Hisamoto

Chiaki Maeda

Akitoshi Iwatani

Shoshin Fukui

Atsuo Katsushima

Takahisa Kato

Hiroyuki Shinkai

Masayuki Nagai

A compound of the formula: ##STR1## WHEREIN Q is a hydrogen atom, --CH.sub.2 CH(OH)CH.sub.2 Rf or a hydrocarbon residue having a valence corresponding to m which may contain one or more of --O--, --COO--, --NH--, --N.dbd. and ##STR2## IN THE CHAIN, R is a hydrogen atom, a hydrocarbon residue or --CH.sub.2 CH(OH)CH.sub.2 Rf and m is an integer of not less than 1, Rf being a perfluoroalkyl group, an .omega.-hydro-perfluoroalkyl group o an .differential.-chloro-erfluoroalkylgroup having 4 to 20 carbon atoms, which is useful as an agent for rendering fibrous materials oleophobic and anti-soiling and may be prepared by reacting a perfluoroalkylpropylene oxide of the formula: ##STR3## wherein Rf is the same as defined above, with a reagent of the formula:

2-Hydroxy-1,1,2,3,3-pentahydro-perfluoroalkyl derivatives, their

A 2-hydroxy-1,1,2,3,3-pentahydroperfluoroalkyl derivative of either one of the formulae:

2-Hydroxy-1,1,2,3,3-pentahydro-perfluoroalkyl derivatives, and their

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Kyoto, Japan

Masayuki Asaoka