FLUORINATED POLYMER AND SURFACE TREATING AGENT COMPOSITION

1 . A surface-treating composition comprising

(1) a fluorine-containing polymer having a repeating unit derived from (a) a fluorine-containing monomer comprising (a1) a first fluorine-containing monomer and (a2) a second fluorine-containing monomer,

wherein the first fluorine-containing monomer (a1) is a compound represented by the formula:

CH 2 ═C(—X 1 )—C(═O)—Y 1 —Z 1 —Rf 1

wherein

X 1 is a halogen atom,

Y 1 is —O— or —NH—,

Z 1 is a direct bond or a divalent organic group, and

Rf 1 is a fluoroalkyl group having 1 to 6 carbon atoms, and

the second fluorine-containing monomer (a2) is a compound represented by the formula:

CH 2 ═C(—X 2 )—C(═O)—Y 2 —Z 2 —Rf 2

wherein

X 2 is a monovalent organic group or a hydrogen atom,

Y 2 is —O— or —NH—,

Z 2 is a direct bond or a divalent organic group, and

Rf 2 is a fluoroalkyl group having 1 to 6 carbon atoms and

(2) liquid medium which is an aqueous medium.

2 . The surface-treating composition according to claim 1 ,

wherein

X 1 is a chlorine atom in the first fluorine-containing monomer (a1),

X 2 is a hydrogen atom in the second fluorine-containing monomer (a2), and

the weight ratio (a1):(a2) of the first fluorine-containing monomer (a1) to the second fluorine-containing monomer (a2) is from 5:95 to 95:5.

3 . The surface-treating composition according to claim 1 ,

wherein

in the first fluorine-containing monomer (a1) and the second fluorine-containing monomer (a2),

each of Y 1 and Y 2 is —O—,

each of Z 1 and Z 2 is, the same as or different from each other, and is a direct bond, an aliphatic group having 1 to 10 carbon atoms, an aromatic group or a cycloaliphatic group having 6 to 18 carbon atoms, a group represented by the formula —R 2 (R 1 )N—SO 2 — or —R 2 (R 1 )N—CO— (wherein R 1 is an alkyl group having 1 to 10 carbon atoms, and R 2 is a linear alkylene group or a branched alkylene group having 1 to 10 carbon atoms), a group represented by the formula —CH 2 CH(OR 3 )CH 2 —(Ar—O) p — (wherein R 3 is a hydrogen atom or an acyl group having 1 to 10 carbon atoms, Ar is an arylene group, and p is 0 or 1), a group represented by the formula —(CH 2 ) r —Ar—(O) q — (wherein Ar is an arylene group, q is 0 or 1, and r is 0 to 10), or a group represented by the formula —(CH 2 ) m —SO 2 —(CH 2 ) n — or —(CH 2 ) m —S—(CH 2 ) n — (wherein m is 1 to 10, and n is 0 to 10).

4 . The surface-treating composition according to claim 1 ,

wherein

the fluorine-containing polymer further has a repeating unit derived from:

(b) a fluorine-free monomer,

wherein the fluorine-free monomer (b) comprises:

(b1) a fluorine-free non-crosslinkable monomer

represented by the formula:

CH 2 =CA-T

wherein

A is a hydrogen atom, a methyl group or a halogen atom other than a fluorine atom,

T is a hydrogen atom, a halogen atom other than a fluorine atom, a chain or cyclic hydrocarbon group having 1 to 30 carbon atoms, or a chain or cyclic organic group having 1 to 30 carbon atoms and having an ester bond.

5 . The surface-treating composition according to claim 4 ,

wherein

the fluorine-free non-crosslinkable monomer (b1) is at least one of:

(b1-1) an acrylate ester monomer represented by the formula:

CH 2 =CA 21 -C(═O)—O-A 22

wherein

A 21 is a hydrogen atom, a monovalent organic group or a halogen atom other than a fluorine atom, and

A 22 is a hydrocarbon group having 1 to 30 carbon atoms, and

(b1-2) a halogenated olefin monomer which is an olefin having 2 to 20 carbon atoms substituted with 1 to 10 chlorine, bromine or iodine atoms.

6 . The surface-treating composition The fluorine-containing polymer according to claim 5 ,

wherein A 22 is an acyclic aliphatic hydrocarbon group having 12 to 30 carbon atoms in the acrylate ester monomer (b1-1).

7 . The surface-treating composition according to claim 5 ,

wherein the halogenated olefin monomer (b1-2) is vinyl chloride or vinylidene chloride.

8 . The surface-treating composition according to claim 1 ,

wherein the amount of the fluorine-containing monomer (a) is 20 to 90% by weight, and the amount of a fluorine-free monomer (b) is 10 to 80% by weight, based on the total amount of the fluorine-containing monomer (a) and the fluorine-free monomer (b).

9 . The surface-treating composition according to claim 1 comprising:

(3) surfactant.

10 . The surface-treating composition comprising according to claim 1 , which further comprises (4) a curing agent, wherein the curing agent is a blocked polyisocyanate compound.

11 . The surface-treating composition comprising according to claim 9 , wherein the amount of the fluorine-containing polymer (1) is from 0.01 to 60% by weight based on the surface-treating composition, the amount of the liquid medium (2) is from 30 to 99.5% by weight based on the surface-treating composition, and the amount of the surfactant (3) is from 0.1 to 50 parts by weight, based on 100 parts by weight of the fluorine-containing polymer.

12 . A method for producing a treated textile product, comprising a step of applying the surface-treating composition according to claim 1 , to a textile product.

13 . The producing method according to claim 12 ,

wherein the textile product is a nonwoven fabric, and the weight ratio (a1):(a2) of the repeating unit (a1) to the repeating unit (a2) in the fluorine-containing polymer is 20:80 to 45:55.

14 . The producing method according to claim 12 ,

wherein the textile product is a knitted/woven fabric, and the weight ratio (a1):(a2) of the repeating unit (a1) to the repeating unit (a2) in the fluorine-containing polymer is 50:50 to 75:25.

15 . A treated textile product obtained by treating with the surface-treating composition according to claim 1 .

16 . The surface-treating composition comprising according to claim 1 ,

wherein Rf 1 and Rf 2 are a perfluoroalkyl group.

17 . The surface-treating composition comprising according to claim 1 ,

wherein the amount of the repeating unit derived from the fluorine-containing monomer (a) in the fluorine-containing polymer is at least 40% by weight.

18 . The surface-treating composition comprising according to claim 1 ,

wherein the amount of an organic solvent is at most 30% by weight in the liquid medium.