A method for producing a fluoropolyether group-containing compound, which includesreacting a fluoropolyether group-containing compound (A) represented by the following formula:

X.sup.11—(R.sup.11).sub.n11—R.sup.F1—X.sup.12  (1)

in the presence of a metal catalyst to form a fluoropolyether group-containing compound (B) containing two or more moieties derived from the fluoropolyether group-containing compound (A). Each of the above symbols is as defined in the description.

A fluorinated compound and a fluorinated compound-containing composition which enable formation of a surface layer having high friction resistance and fingerprint marks removability even if the fluorinated compound has a fluorinated organic group having a shorter chain are provided. A coating liquid, an article including the surface layer on its surface, and a method of producing the same are also provided.

A fluorinated compound represented by [(R.sup.f-A-).sub.2N-].sub.a1Q.sup.1[-T].sub.b1 (wherein R.sup.f: a fluoroalkyl group or a group having —O— between carbon atoms of a fluoroalkyl group having two or more carbon atoms, A: a divalent organic group having no fluorine atom, Q.sup.1: a a1+b1 valent organic group, T: —Si(R).sub.3-c(L).sub.c, R: an alkyl group, L: a hydrolyzable group or a hydroxyl group, a1: an integer of 1 or more, b1: an integer of 2 or more, and c: 2 or 3).

The invention is a polyrotaxane monomer (A) having a composite molecular structure composed of cyclic molecules and an axial molecule that skewer-like threads through the rings of the cyclic molecules and has a bulky group at both ends thereof so as not to dethread the rings, and the polyrotaxane monomer has a polymerizable functional group in the molecule and has a water content of 5000 ppm or less. According to the present invention, there can be provided a polyrotaxane monomer having a high productivity and capable of producing a high-quality material at a high yield, while maintaining excellent mechanical characteristics of the polyrotaxane monomer.

A surface treatment agent which comprises a fluoropolyether-group-containing polymer represented by the following formula (1) or (2)
Rf.sup.1—[N(V).sub.β(E).sub.γ].sub.α  (1)
Rf.sup.1-[Q-(G).sub.δ-(E′).sub.ε-B].sub.α  (2)
and/or a product of partial (hydrolytic) condensation of the polymer. The surface treatment agent forms a cured coating film excellent in terms of water and oil repellency and resistance to abrasion with erasers.
(In formulae (1) and (2), Rf.sup.1 is a mono- or divalent polymer residue containing a fluorooxyalkylene group; N is C, Si, N, or a tri- to octavalent group optionally substituted by F; V is a monovalent group containing a hydroxy group or hydrolyzable group at the terminal; E is a monovalent group containing an oxyalkylene group; α is 1 or 2; β and γ are each 1-6, and β+γ is 2-7; Q is a single bond or a divalent group; G is a divalent group containing a hydroxy group or hydrolyzable group; E′ is a divalent group containing an oxyalkylene group; B is H, an alkyl group, or a halogeno; δ is 0-10; and ε is 1-10.)

A surface treatment agent which comprises a fluoropolyether-group-containing polymer represented by the following formula (1) or (2)
Rf.sup.1—[N(V).sub.β(E).sub.γ].sub.α  (1)
Rf.sup.1-[Q-(G).sub.δ-(E′).sub.ε-B].sub.α  (2)
and/or a product of partial (hydrolytic) condensation of the polymer. The surface treatment agent forms a cured coating film excellent in terms of water and oil repellency and resistance to abrasion with erasers.
(In formulae (1) and (2), Rf.sup.1 is a mono- or divalent polymer residue containing a fluorooxyalkylene group; N is C, Si, N, or a tri- to octavalent group optionally substituted by F; V is a monovalent group containing a hydroxy group or hydrolyzable group at the terminal; E is a monovalent group containing an oxyalkylene group; α is 1 or 2; β and γ are each 1-6, and β+γ is 2-7; Q is a single bond or a divalent group; G is a divalent group containing a hydroxy group or hydrolyzable group; E′ is a divalent group containing an oxyalkylene group; B is H, an alkyl group, or a halogeno; δ is 0-10; and ε is 1-10.)

The present invention provides, among other things, compounds that include a water-soluble and non-peptidic polymer as well as a maleimidyl group. The compounds are useful as, among other things, polymeric reagents.

The present invention provides, among other things, compounds that include a water-soluble and non-peptidic polymer as well as a maleimidyl group. The compounds are useful as, among other things, polymeric reagents.

The present invention provides, among other things, compounds that include a water-soluble and non-peptidic polymer as well as a maleimidyl group. The compounds are useful as, among other things, polymeric reagents.

A surface treatment agent which comprises a fluoropolyether-group-containing polymer represented by the following formula (1) or (2)

Rf.sup.1[N(V).sub.(E).sub.].sub.(1)

Rf.sup.1-[Q-(G).sub.-(E).sub.-B].sub.(2)

and/or a product of partial (hydrolytic) condensation of the polymer. The surface treatment agent forms a cured coating film excellent in terms of water and oil repellency and resistance to abrasion with erasers.
(In formulae (1) and (2), Re is a mono- or divalent polymer residue containing a fluorooxyalkylene group; N is C, Si, N, or a tri- to octavalent group optionally substituted by F; V is a monovalent group containing a hydroxy group or hydrolyzable group at the terminal; E is a monovalent group containing an oxyalkylene group; a is 1 or 2; and are each 1-6, and + is 2-7; Q is a single bond or a divalent group; G is a divalent group containing a hydroxy group or hydrolyzable group; E is a divalent group containing an oxyalkylene group; B is H, an alkyl group, or a halogeno; is 0-10; and is 1-10.)

A surface treatment agent which comprises a fluoropolyether-group-containing polymer represented by the following formula (1) or (2)

Rf.sup.1[N(V).sub.(E).sub.].sub.(1)

Rf.sup.1-[Q-(G).sub.-(E).sub.-B].sub.(2)

and/or a product of partial (hydrolytic) condensation of the polymer. The surface treatment agent forms a cured coating film excellent in terms of water and oil repellency and resistance to abrasion with erasers.
(In formulae (1) and (2), Re is a mono- or divalent polymer residue containing a fluorooxyalkylene group; N is C, Si, N, or a tri- to octavalent group optionally substituted by F; V is a monovalent group containing a hydroxy group or hydrolyzable group at the terminal; E is a monovalent group containing an oxyalkylene group; a is 1 or 2; and are each 1-6, and + is 2-7; Q is a single bond or a divalent group; G is a divalent group containing a hydroxy group or hydrolyzable group; E is a divalent group containing an oxyalkylene group; B is H, an alkyl group, or a halogeno; is 0-10; and is 1-10.)