Water-repellent composition for foaming process

Details Water-repellent composition for foaming process Water-repellent composition for foaming process

2002-11-08

2004-03-02

Foelak, Morton (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

C521S072000

Reexamination Certificate

active

06699914

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a water-repellent composition for foaming process of a hydrophobic textile (for example, a fabric), and a textile treated with said water-repellent composition.
RELATED ARTS
A textile is generally and widely processed for the purpose of imparting water-repellency and water resistance to the textile.
When the water-repellency and the water resistance are imparted to the textile, generally, a water-repellent agent is applied by a dip-nip method or a spray method and the textile is thermally treated.
In the dip-nip method, the textile is completely wetted so that a wet pick up is high and a subsequent thermal treatment requires a large amount of heat. In addition, a large quantity of the water-repellent treatment liquid is necessary so that excess amount of the water-repellent becomes a waste liquid.
In the spray method, the loss of the water-repellent treatment liquid is large, and this method has a problem in environmental health since fine mists waft during the treatment.
A foam process is widely conducted for a hydrophilic textile, since the treatment liquid easily penetrates into the textile. However, for a hydrophobic textile, a wetting agent which penetrates the treatment liquid into the textile is necessary. Many of the generally used wetting agent has an antifoaming effect and the foam process of the hydrophobic textile was difficult.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a water-repellent composition for foaming process, which is suitable for a hydrophobic textile and easily generates sufficient foam.
The present invention provides a water-repellent composition for foaming process of a hydrophobic textile, comprising:
(A) a dispersion of a fluorine-containing polymer,
(B) a foaming agent, and
(C) a wetting agent.
The water-repellent composition of the present invention may further contain (D) a water-soluble polymer.
DETAILED EXPLANATION OF THE INVENTION
<Dispersion of Fluorine-containing Polymer (A)>
Generally, the dispersion of fluorine-containing polymer (A) is a dispersion of fluorine-containing polymer wherein a fluorine-containing polymer is dispersed in a liquid, for example, water and an organic solvent, in the presence of a surfactant. The dispersion is generally an emulsion.
The fluorine-containing polymer is a homopolymer or copolymer of a fluorine-containing monomer. The copolymer is a copolymer a fluorine-containing monomer and another monomer copolymerizable herewith.
The fluorine-containing monomer is generally a polymerizable compound having a perfluoroalkyl and perfluoroalkenyl group and an acrylate or methacrylate group. In the copolymer of the fluorine-containing monomer, the amount of the fluorine-containing monomer is at least 40% by weight, preferably at least 60% by weight, based on whole of the copolymer.
Examples of the polymerizable compound having the perfluoroalkyl and perfluoroalkenyl group and the acrylate or methacrylate group are as follows:
wherein Rf is a perfluoroalkyl or perfluoroalkenyl 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,
Ar is an aryl group which optionally has a substituent group, and
n is an integer of 1 to 10.
Specific examples of the polymerizable compound include the followings:
CF
3
(CF
2
)
7
(CH
2
)OCOCH═CH
2
CF
3
(CF
2
)
6
(CH
2
)OCOC(CH
3
)═CH
2
(CF
3
)
2
CF(CF
2
)
6
(CH
2
)
2
OCOCH═CH
2
CF
3
(CF
2
)
7
(CH
2
)
2
OCOC(CH
3
)═CH
2
CF
3
(CF
2
)
7
(CH
2
)
2
OCOCH═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
OCOC(CH
3
)═CH
2
(CF
3
)
2
CF(CF
2
)
6
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
The another copolymerizable compound are various. Examples of the another copolymerizable compound include: (1) acrylic acid and methacrylic acid, and methyl, ethyl, butyl, isobutyl, t-butyl, propyl, 2-ethylhexyl, hexyl, decyl, isodecyl, lauryl, stearyl, isostearyl, isobornyl, &bgr;-hydroxyethyl, glycidyl, phenyl, benzyl and 4-cyanophenyl esters thereof; (2) vinyl esters of fatty acids such as acetic acid, propionic acid, caprylic acid, lauric acid and stearic acid; (3) styrene compounds such as styrene, &agr;-methylstyrene and p-methylstyrene; (4) vinyl halides and vinylidene compounds such as vinyl fluoride, vinyl chloride, vinyl bromide, vinylidene fluoride and vinylidene chloride; (5) fatty acid allyl esters such as allyl heptanoate, allyl caprylate and allyl caproate; (6) vinyl alkyl ketones such as vinyl methyl ketone and vinyl ethyl ketone; (7) acryl amides such as N-methylacrylamide and N-methylolmethacrylamide; and (8) dienes such as 2,3-dichloro-1,3-butadiene and isoprene.
The surfactant which is used for dispersing the polymer may be any of a nonionic surfactant, an anionic surfactant and a cationic surfactant.
The surfactant may comprise a combination of the cationic surfactant and the nonionic surfactant.
The cationic surfactant includes dodecyl trimethyl ammonium acetate, trimethyl tetradecyl ammonium chloride, hexadecyl trimethyl ammonium bromide, trimethyl octadecyl ammonium chloride (stearyl trimethyl ammonium chloride), behenyl trimethyl ammonium chloride, (dodecylmethylbenzyl) trimethyl ammonium chloride, didodecyl dimethyl ammonium chloride, dioctadecyl dimethyl ammonium chloride, benzyl dodecyl dimethyl ammonium chloride, benzyl tetradecyl dimethyl ammonium chloride, benzyl octadecyl dimethyl ammonium chloride, methyl dodecyl di(hydropolyoxyethylene) ammonium chloride, benzyl dodecyl di(hydropolyoxyethylene) ammonium chloride and N-[2-(diethylamino)ethyl]oleamide hydrochloride.
The nonionic surfactant includes a condensate comprising ethylene oxide and hexylphenol, isooctylphenol, hexadecanol, oleic acid, alkane(C
12
-C
16
) thiol, sorbitan monofatty(C
7
-C
19
) acid or alkyl(C
12
-C
18
) amine.
A weight ratio of the cationic surfactant to the nonionic surfactant is from 1:9 to 9:1, for example, from 1:9 to 5:5.
The amount of the surfactant may be from 0.01 to 30 parts by weight, for example, from 1 to 20 parts by weight, based on 100 parts by weight of the fluorine-containing polymer.
In the dispersion of fluorine-containing polymer (A), the fluorine-containing polymer is dispersed in water and optionally an organic solvent.
The amount of water is from 70 to 1,900 parts by weight, for example, from 100 to 600 parts by weight, based on 100 parts by weight of the fluorine-containing polymer.
Examples of the organic solvent are ketones such as acetone and methyl ethyl ketone; ethylene glycol derivatives such as ethylene glycol and polyethylene glycol; alkyl ethers of ethylene glycol derivatives such as polyethylene glycol monomethyl ether, polyethylene glycol dimethyl ether, polyethylene glycol monobutyl ether; propylene glycol derivatives such as propylene glycol, dipropylene glycol and polypropylene glycol; polyethers such as cyclodextrin and dexstrin; and esters such as methyl acetate and ethyl acetate.
The amount of the organic solvent is from 0 to 200 parts by weight, for example, from 10 to 100 parts by weight, particularly from 20 to 80 parts by weight, based on 100 parts by weight of the fluorine-containing polymer.
In order to prepare the dispersion of fluorine-containing polymer (A), the polymerizable compound is emulsion-polymerized in water (and optionally the organic solvent) in the presence of the surfactant to give the dispersion of the polymer. Optionally, water and/or the surfactant may be added to the resultant dispersion.
The polymerization temperature may be from 40° C. to 90° C., for example, 45° C. to 60° C. The polymerization time may be from 0.5 hours to 20 hours, for example, from 2 hours to 10 hours.
The amount of the dispersion of fluorine-containing polymer (A) is the balance of deducting the total amount of the foaming agent (B) and the wetting agent (C) (and water-soluble polym

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