WATER AND OIL REPELLENT AND TEXTILE PRODUCT

1 . A water- and oil-repellent agent comprising a fluorine-containing copolymer comprising repeating units derived from:

(a) a fluorine-containing monomer represented by the general formula:

CH 2 ═C(—X)—C(═O)—Y—Z—Rf   (1)

wherein X is a hydrogen atom, a monovalent organic group, or a halogen atom;

Y is —O—or —NH—;

Z is a direct bond or a divalent organic group; and

Rf is a fluoroalkyl group having 1 to 20 carbon atoms, and

(b) nonyl (meth)acrylate.

2 . The water- and oil-repellent agent according to claim 1 , wherein in general formula (1), X is a hydrogen atom, a linear or branched alkyl group having 1 to 21 carbon atoms, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a CFX 1 X 2 group (wherein X 1 and X 2 are each a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, or an iodine atom), a cyano group, a linear or branched fluoroalkyl group having 1 to 21 carbon atoms, a substituted or unsubstituted benzyl group, or a substituted or unsubstituted phenyl group.

3 . The water- and oil-repellent agent according to claim 1 , wherein in general formula (1), Z 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 —CH 2 CH 2 N(R 1 )SO 2 - group wherein R 1 is an alkyl group having 1 to 4 carbon atoms,

a —CH 2 CH(OZ 1 )CH 2 — group wherein Z 1 is a hydrogen atom or an acetyl group, or

a —(CH 2 ) m —SO 2 —(CH 2 ) n — group or a —(CH 2 ) m —S—(CH 2 ) n — group wherein m is 1 to 10, and n is 0 to 10.

4 . The water- and oil-repellent agent according to claim 1 , wherein in general formula (1), Rf is a fluoroalkyl group having 1 to 6 carbon atoms.

5 . The water- and oil-repellent agent according to claim 1 , wherein the nonyl (meth)acrylate (b) is isononyl (meth) acrylate.

6 . The water- and oil-repellent agent according to claim 1 , wherein the fluorine-containing copolymer further comprises at least one repeating unit derived from at least one selected from the group consisting of

(c) a fluorine-free non-crosslinkable monomer excluding the nonyl (meth)acrylate (b),

(d) a fluorine-free crosslinkable monomer, and

(e) a halogenated olefin monomer.

7 . The water- and oil-repellent agent according to claim 1 , which comprises a fluorine-containing composite polymer comprising:

a first polymer which is the fluorine-containing copolymer, and

a second polymer which is another polymer containing a repeating unit derived from (e) a halogenated olefin monomer.

8 . The water- and oil-repellent agent according to claim 6 , wherein the halogenated olefin monomer (e) is an olefin having 2 to 20 carbon atoms and substituted by 1 to 10 chlorine atoms, bromine atoms, or iodine atoms.

9 . The water- and oil-repellent agent according to claim 6 , wherein the halogenated olefin monomer (e) is vinyl chloride, vinyl bromide, vinyl iodide, vinylidene chloride, vinylidene bromide, or vinylidene iodide.

10 . The water- and oil-repellent agent according to claim 1 , which further comprises an aqueous medium.

11 . The water- and oil-repellent agent according to claim 1 , wherein

a proportion of the monomer (a) is 20 to 90% by mass,

a proportion of the monomer (b) is 0.1 to 70% by mass,

a proportion of the monomer (c) is 0.5 to 50% by mass,

a proportion of the monomer (d) is 0.5 to 50% by mass, and

a proportion of the monomer (e) is 0.5 to 50% by mass,

based on 100% by mass of the fluorine-containing copolymer or the fluorine-containing composite polymer, and

a concentration of the fluorine-containing copolymer or the fluorine-containing composite polymer in the water- and oil-repellent agent is 0.01 to 50% by mass.

12 . A textile product comprising a fibrous substrate treated with the water- and oil-repellent agent according to claim 1 .

13 . The textile product according to claim 12 , wherein the fibrous substrate is a nonwoven fabric.