Fluorine-free aqueous dispersions for the finishing of textile fabrics

Abstract

An aqueous dispersion free of fluorochemicals comprising (A) at least one copolymer obtained by polymerization of the following monomers a) at least one fluorine-free (meth)acrylate ester of a C.sup.16-C.sup.18 alcohol, b) at least one fluorine-free (meth)acrylate ester of a C.sup.18-C.sup.22 alcohol, c) at least one monomer selected from the group of vinyl chloride and vinylidene chloride, and, optionally, d) at least one monomer selected from the group of 2-hydroxyethyl(meth)acrylate and 3-chloro-2-hydroxyethyl(meth)acrylate, (B) at least one component selected from the group of a paraffin wax, (C) at least one surfactant, and (D) water, wherein the monomers a) and b) of copolymer (A) are distinct, and the copolymer (A) does not contain any polymerized units of styrene or -methylstyrene, is useful for the finishing of natural and synthetic textile fabrics to endow the said fabrics with excellent water repellent properties.

Claims

1. An aqueous dispersion free of fluorochemicals comprising (A) at least one copolymer obtained by polymerization of the following monomers a) at least one fluorine-free (meth)acrylate ester of a C.sub.16-C.sub.18 alcohol, b) at least one fluorine-free (meth)acrylate ester of a C.sub.18-C.sub.22 alcohol, c) at least one monomer selected from the group of vinyl chloride and vinylidene chloride, and, optionally, d) at least one monomer selected from the group of 2-hydroxyethyl(meth)acrylate and 3-chloro-2-hydroxyethyl(meth)acrylate (B) at least one component selected from the group of a paraffin wax having a melting range of 55 C. to 75 C. and a silicon wax having a melting range of 25 C. to 55 C., (C) at least one surfactant, and (D) water, wherein the monomers a) and b) of copolymer (A) are distinct, and the copolymer (A) does not contain any polymerized units of styrene or -methylstyrene.

2. The aqueous dispersion according to claim 1, comprising 20% to 60% by weight of component (A), and 40% to 80% by weight of a paraffin wax having a melting range of 55 C. to 75 C. as component (B), based on the total weight of component (A) and component (B) in the aqueous dispersion.

3. The aqueous dispersion according to claim 1, comprising 60% to 95% by weight of component (A), and 5% to 40% by weight of a silicon wax having a melting range of 25 C. to 55 C. as component (B), based on the total weight of component (A) and component (B) in the aqueous dispersion.

4. The aqueous dispersion according to claim 1, wherein the at least one copolymer (A) is obtained from polymerizing with one another 20% to 50% by weight of monomer a), 20% to 50% by weight of monomer b), 10% to 40% by weight of monomer c), 0% to 10% by weight of monomer d), based on the total weight of monomers a), b), c) and d) used in the polymerization reaction.

5. The aqueous dispersion according to claim 1, wherein the at least one surfactant is selected from a group consisting of a fatty amine, a fatty alcohol ethoxylate, and a surfactant mixture of a fatty amine and a fatty alcohol ethoxylate.

6. A process for treating a textile fabric, which comprises applying an aqueous dispersion according to claim 1, to the textile fabric.

7. The process according to claim 6, wherein the textile fabric is a cotton, polyester or a cotton-polyester blend fabric.

8. A copolymer obtained by polymerization of the following monomers a) at least one fluorine-free (meth)acrylate ester of a C.sub.16-C.sub.18 alcohol, b) at least one fluorine-free (meth)acrylate ester of a C.sub.18-C.sub.22 alcohol, c) at least one monomer selected from the group of vinyl chloride and vinylidene chloride, and, optionally, d) at least one monomer selected from the group of 2-hydroxyethyl(meth)acrylate and 3-chloro-2-hydroxyethyl(meth)acrylate, wherein monomer a) and monomer b) are distinct.

9. The aqueous dispersion according to claim 1 wherein the at least one copolymer (A) is obtained from polymerizing with one another 30% to 40% by weight of monomer a), 30% to 40% by weight of monomer b), 20% to 30% by weight of monomer c), 0% to 5% by weight of monomer d), based on the total weight of monomers a), b), c) and d) used in the polymerization reaction.

Description

EXAMPLE 1

(1) a) A vessel is charged with 2.2 parts of octadecyldimethyl amine, 1.1 parts of Tergitol TMN-10, 6.6 parts of dipropylene glycol, and 2.0 parts of acetic acid (60%). To this mixture are added 15.0 parts of Behenylmethacrylate, 15.0 parts of Stearylmethacrylate, and 0.7 parts of 2-hydroxyethylmethacrylate and, finally, 110 parts of warm water. The mixture is stirred with a Turrax for about 1 minute, which is followed by high-pressure dispersing at a pressure of 250 bar and a temperature of from 50 to 60 C. to yield a stable emulsion. The emulsion obtained is cooled to a temperature of about 20 C. After addition of 0.4 parts of Wako V 50 in 4.6 parts of water and 12.0 parts of vinylidene chloride polymerization is carried out in a nitrogen atmosphere at 65 C. for about 8 hours. 152 parts of an aqueous copolymer dispersion are obtained (40.6 parts of product after drying at 120 C. for 90 minutes).

(2) b) In a vessel 60.0 parts of Paraffin 2222 or Sasolwax 7040 are melted at a temperature of about 90 C. 10.0 parts of dipropylene glycol are added to the hot melt of the paraffin wax obtained. A separate vessel is charged under stirring with 3.4 parts of octadecyldimethyl amine, 1.6 parts of Tergitol TMN-10, and 4.0 parts of acetic acid (60%), and, finally, 200 parts of hot water. The mixture obtained is added to the molten wax under stirring. Subsequently, the resulting mixture is stirred with a Turrax for about 1 minute which is followed by high-pressure dispersing at a pressure of 250 bar and a temperature of from 85 to 90 C. to yield 265 parts of a stable dispersion.

(3) An aqueous dispersion according to the present disclosure is obtained by mixing 56.3 parts of the dispersion obtained by step a) and 155.8 parts of the dispersion obtained by step b).

EXAMPLE 2

(4) A vessel is charged with 2.2 parts of octadecyldimethyl amine, 1.1 parts of Tergitol TMN-10, 6.6 parts of dipropylene glycol, and 2.0 parts of acetic acid (60%). To this mixture are added 8.5 parts of silicon wax, 15.0 parts of Behenylmethacrylate, 15.0 parts of Stearylmethacrylate, and 0.7 parts of 2-hydroxyethylmethacrylate and, finally, 110 parts of warm water. The mixture is stirred with a Turrax for about 1 minute, followed by high-pressure dispersing at a pressure of 250 bar and a temperature of from 50 to 60 C. to yield a stable emulsion. The emulsion obtained is cooled to a temperature of about 20 C. After addition of 0.5 parts of Wako V 50 in 4.5 parts of water and 12.0 parts of vinylidene chloride polymerization is carried out in a nitrogen atmosphere at 65 C. for about 8 hours. 155 parts of an aqueous dispersion according to the present disclosure are obtained (47.3 parts of product after drying at 120 C. for 90 minutes).

(5) The following examples describes the treatment of different textile fabrics with a dispersion prepared as per Example 1 and Example 2.

APPLICATION EXAMPLES (FINISHING)

(6) Polyester: a woven 100% polyester fabric is padded with a liquor containing 1 g/l of 60% acetic acid, 5 g/l of a wetting agent (INVADINE PBN), and 40 g/l (80 g/1) of either the dispersion of Example 1 or the dispersion of Example 2 (liquor pick-up 59%).

(7) Cotton-polyester blend: a woven fabric is treated in a pad-mangle with a liquor containing 1 g/l of 60% acetic acid, 5 g/l of a wetting agent (INVADINE PBN), and 40 g/l (80 g/l) of either the dispersion of Example 1 or the dispersion of Example 2 (liquor pick-up 51%).

(8) Cotton: a woven cotton fabric (100%) is treated in a pad-mangle with a liquor containing 1 g/l of 60% acetic acid, 5 g/l of a wetting agent (INVADINE PBN), and 40 g/l (80 g/l) of either the dispersion of Example 1 or the dispersion of Example 2 (liquor pick-up 69%).

(9) The above application examples are repeated by using aqueous treatment compositions which in addition to the ingredients indicated above contain 5 g/l (10 g/l) of PHOBOL XAN extender.

(10) After padding, the fabrics (cotton, polyester and cotton-polyester blend) are dried at 110 C. for 10 minutes and then cured at 150 C. for 5 minutes.

(11) The finished fabrics obtained as per the application examples are subjected to the following tests:

(12) (I) Spray test as per AATCC 22-2005, ISO 4920 (EN 24 920)

(13) (II) Bundesmann Test as per DIN EN 29865, ISO 9865

(14) The test results are summarized below in Tables 1 to 3.

(15) TABLE-US-00001 TABLE 1 Results for polyester fabric Ex1(40).sup.a Ex1(80).sup.b Ex2(40).sup.a Ex2(80).sup.b Test Ex1(40).sup.a Ex1(80).sup.b PL(5).sup.c PL(10).sup.d Ex2(40).sup.a Ex2(80).sup.b PL(5).sup.c PL(10).sup.d (I) initial.sup.e 100 100 100 100 100 100 100 100 (I) wash.sup.f 100 100 95 100 100 100 100 100 (II) [%] 21.3 20.2 9 4.7 16.2 14.1 9 3.7 (II) [grade] 2, 2, 2 2, 2, 2 4, 3, 3 5, 4, 4 2, 2, 2 2, 2, 2 2, 2, 2 3, 3, 3 (II) [ml] 13 7 2 1 2 2 1 1 .sup.a40 g/l of dispersion of Example 1 (Ex1) or Example 2 (Ex2). .sup.b80 g/l of dispersion of Example 1 (Ex1) or Examle 2 (Ex2). .sup.c5 g/l of PHOBOL XAN extender. .sup.d10 g/l of PHOBOL XAN extender. .sup.einitial grade after finishing of the fabric. .sup.fgrade after 20 washings and laundering of the finished frabric 20 7AL TD (laundry tumble dry).

(16) TABLE-US-00002 TABLE 2 Results for cotton-polyester blend fabric Ex1(40).sup.a Ex1(80).sup.b Ex2(40).sup.a Ex2(80).sup.b Test Ex1(40).sup.a Ex1(80).sup.b PL(5).sup.c PL(10).sup.d Ex2(40).sup.a Ex2(80).sup.b PL(5).sup.c PL(10).sup.d (I) initial.sup.e 100 100 100 100 100 100 100 100 (I) wash.sup.f 90 100 95 100 90 100 100 100 (II) [%] 8.4 8.1 5.3 4.2 6.1 5.2 4.5 3.7 (II) [grade] 4, 4, 4 4, 4, 4 5, 5, 5 5, 5, 5 4, 4, 4 4, 4, 4 4, 4, 4 4, 4, 4 (II) [ml] 5 3 4 3 3 4 3 4 .sup.a to .sup.f are defined as given under Table 1

(17) TABLE-US-00003 TABLE 3 Results for cotton fabric Ex1(40).sup.a Ex1(80).sup.b Ex2(40).sup.a Ex2(80).sup.b Test Ex1(40).sup.a Ex1(80).sup.b PL(5).sup.c PL(10).sup.d Ex2(40).sup.a Ex2(80).sup.b PL(5).sup.c PL(10).sup.d (I) initial.sup.e 90 100 100 100 100 100 100 100 (I) wash.sup.f 70 90 90 100 80 90 95 95 (II) [%] 25.7 17.4 20.9 9 19.8 11.3 14.9 8.8 (II) [grade] 1, 1, 1 4, 3, 2 2, 1, 1 5, 4, 3 4, 2, 2 4, 4, 3 4, 2, 2 4, 4, 4 (II) [ml] 20 7 3 3 3 2 2 3 .sup.a to .sup.f are defined as given under Table 1