Water- and oil-repellent treatment of textile

Details Water- and oil-repellent treatment of textile Water- and oil-repellent treatment of textile

2002-03-12

2002-10-29

Cameron, Erma (Department: 1762)

Coating processes

With post-treatment of coating or coating material

Liquid extraction of coating constituent or cleaning coating

C427S377000, C427S393400

Reexamination Certificate

active

06472019

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a treatment for imparting excellent water repellency, oil repellency, stain block property and yellowing-resistance to a textile. A method of the present invention is particularly useful for carpet.
BACKGROUND OF THE INVENTION
Hitherto, various treatment methods have been proposed in order to impart water repellency, oil repellency and soil releasability to a textile such as a carpet. For example, a process of treating a textile comprising decreasing a pH of a treatment liquid, applying the treatment liquid to the textile, thermally treating the textile with steam, washing the textile with water, and dehydrating the textile (hereinafter, sometimes referred to as “Exhaust process”) is proposed.
A method comprising the Exhaust process is proposed in U.S. Pat. Nos. 5,073,442, 5,520,962 and 5,516,337, and International Publication WO 98/50619.
U.S. Pat. No. 5,073,442 discloses a method of treating a textile, comprising conducting an Exhaust process by using a water- and oil-repellent agent comprising a fluorine-containing compound, a formaldehyde condensation product and an acrylic polymer. U.S. Pat. No. 5,520,962 discloses a method of treating a carpet, comprising conducting an Exhaust process by using a fluorine-containing compound and a polymeric binder. U.S. Pat. No. 5,516,337 discloses a method of treating a textile, comprising conducting an Exhaust process by using a fluorine-containing water- and oil-repellent agent and a metal compound such as aluminum sulfate. International Publication WO 98/50619 discloses a method of treating a carpet, comprising conducting an Exhaust process by using a fluorine-containing water- and oil-repellent agent and a salt such as a magnesium salt.
Sufficient water repellency, oil repellency, stain block property and yellowing-resistance cannot be obtained by conducting the Exhaust process in accordance with these methods.
SUMMARY OF THE INVENTION
An object of the present invention is to give a textile excellent in water repellency, oil repellency, stain block property and yellowing-resistance, when an Exhaust process is used.
The present invention provides a method of preparing a treated textile, comprising steps of: (1) preparing a treatment liquid comprising a water- and oil-repellent agent and a stain blocking agent, (2) adjusting pH of the treatment liquid to at most 7, (3) applying the treatment liquid to the textile, (4) treating the textile with steam, and (5) washing the textile with water and dehydrating the textile, wherein the water- and oil-repellent agent comprises at least one fluorine-containing compound selected from the group consisting of a fluorine-containing polymer and a fluorine-containing low molecular weight compound, and the treatment liquid contains a sulfated fatty acid compound.
The present invention also provides a textile prepared by the above-mentioned method, and a treatment liquid used in the above-mentioned method.
The procedure used in the present invention is an Exhaust process which comprises decreasing the pH of the treatment liquid comprising the fluorine-containing compound and stain blocking agent, applying the treatment liquid to the textile, washing the textile with water, and dehydrating the textile.
DETAILED DESCRIPTION OF THE INVENTION
In the step (1) of the method of the present invention, the treatment liquid comprising the water- and oil-repellent agent and the stain blocking agent, which is applied to the textile, is prepared. The treatment liquid comprises the sulfated fatty acid compound, for example, a sulfated castor oil. The treatment liquid may be in the form of a solution or an emulsion, particularly an aqueous emulsion.
The water- and oil-repellent agent is generally a fluorine-containing compound. The fluorine-containing compound is a fluorine-containing polymer and/or a fluorine-containing low molecular weight compound.
The fluorine-containing polymer may be a polymer comprising a repeat unit derived from a fluoroalkyl group-containing monomer such as a fluoroalkyl group-containing (meth)acrylate, a fluoroalkyl group-containing maleate or fumarate, or a fluoroalkyl group-containing urethane.
The fluoroalkyl group-containing (meth)acrylate ester may be of the formula:
Rf-A-OCOCR
11
═CH
2
wherein Rf is a fluoroalkyl group having 3 to 21 carbon atoms, R
11
is a hydrogen atom or a methyl group, and A is a divalent organic group.
In the above formula, A may be a linear or branched alkylene group having 1 to 20 carbon atoms, a —SO
2
N(R
21
)R
22
— group or a —CH
2
CH(OR
23
)CH
2
— group (R
21
is an alkyl group having 1 to 10 carbon atoms, R
22
is a linear or branched alkylene group having 1 to 10 carbon atoms, and R
23
is a hydrogen atom or an acyl group having 1 to 10 carbon atoms).
Examples of the fluoroalkyl group-containing (meth)acrylate are as follows:
 Rf-(CH
2
)
n
OCOCR
3
═CH
2
  (2)
 Rf-O—Ar—CH
2
OCOCR
3
═CH
2
  (6)
wherein Rf is a fluoroalkyl group having 3 to 21 carbon atoms, R
1
is a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, R
2
is an alkylene group having 1 to 10 carbon atoms, R
3
is a hydrogen atom or a methyl group, and Ar is arylene group optionally having a substituent, and n is an integer of 1 to 10.
Specific examples of the fluoroalkyl group-containing (meth)acrylate are as follows:
CF
3
(CF
2
)
7
(CH
2
)
10
OCOCH═CH
2
CF
3
(CF
2
)
7
(CH
2
)
10
OCOC (CH
3
)═CH
2
CF
3
(CF
2
)
6
CH
2
OCOCH═CH
2
CF
3
(CF
2
)
8
CH
2
OCOC (CH
3
)═CH
2
(CF
3
)
2
CF (CF
2
)
6
(CH
2
)
2
OCOCH═CH
2
(CF
3
)
2
CF(CF
2
)
8
(CH
2
)
2
OCOCH═CH
2
(CF
3
)
2
CF(CF
2
)
10
(CH
2
)
2
OCOCH═CH
2
(CF
3
)
2
CF(CF
2
)
6
(CH
2
)
2
OCOC(CH
3
)═CH
2
(CF
3
)
2
CF(CF
2
)
8
(CH
2
)
2
OCOC(CH
3
)═CH
2
(CF
3
)
2
CF(CF
2
)
10
(CH
2
)
2
OCOC(CH
3
)═CH
2
CF
3
CF
2
(CF
2
)
6
(CH
2
)
2
OCOCH═CH
2
CF
3
CF
2
(CF
2
)
8
(CH
2
)
2
OCOCH═CH
2
CF
3
CF
2
(CF
2
)
10
(CH
2
)
2
OCOCH═CH
2
CF
3
CF
2
(CF
2
)
6
(CH
2
)
2
OCOC(CH
3
)═CH
2
CF
3
CF
2
(CF
2
)
8
(CH
2
)
2
OCOC(CH
3
)═CH
2
CF
3
CF
2
(CF
2
)
10
(CH
2
)
2
OCOC(CH
3
)═CH
2
CF
3
(CF
2
)
7
SO
2
N(CH
3
) (CH
2
)
2
OCOCH═CH
2
CF
3
(CF
2
)
7
SO
2
N(C
2
H
5
) (CH
2
)
2
OCOCH═CH
2
(CF
3
)
2
CF(CF
2
)
8
CH
2
CH(OCOCH
3
)CH
2
OCOC(CH
3
)═CH
2
(CF
3
)
2
CF(CF
2
)
6
CH
2
CH(OH)CH
2
OCOCH═CH
2
A fluoroalkyl group-containing urethane monomer deriving the fluorine-containing polymer can be prepared by reacting:
(a) a compound having at least two isocyanate groups,
(b) a compound having one carbon-carbon double bond and at least one hydroxyl group or amino group, and
(c) a fluorine-containing compound one hydroxyl group or amino group.
Examples of the compound (a) include the followings:
The compound (a) is preferably a diisocyanate. However, a triisocyanate and a polyisocyanate can be used for the reaction.
For example, a trimer of diisocyanate, polymeric MDI (diphenylmethane diisocyanate) and an adduct of diisocyanate with a polyhydric alcohol such as trimethylol propane, trimethylol ethane and glycerol can be also used for the reaction.
Examples of the triisocyanate and the polyisocyanate are as follows:
The compound (b) may be, for example, a compound of each of the formulas:
CH
2
═CH—CH
2
—OH
CH
2
═CH—CH
2
—NH
2
In the formula, R
1
is a hydrogen atom or a methyl group. X is as follows:
wherein m and n is a number of 1 to 300.
The compound (c) may be a compound of the formula:
R
f
-R
2
-OH, or
R
f
-R
2
-NH
2
wherein R
f
is a fluoroalkyl group having 1 to 22 carbon atoms, and R
2
is an alkylene group having 1 to 10 carbon atoms and may have a heteroatom.
Examples of the compound (c) may be the followings:
CF
3
CH
2
OH
F(CF
2
)
8
CH
2
CH
2
OH
F(CF
2
)
6
(CH
2
)
6
OH
F(CF
2
)
3
CH2NH
2
F(CF2)
7
CH
2
NH
2
The compounds (a), (b) and (c) may be reacted such that when the compound (a) is a diisocyanate, both the compounds (b) and (c) are in amounts of 1 mol based on 1 mol of the compound (a); when the compound (a) is a triisocyanate

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