Bleaching and dyeing; fluid treatment and chemical modification – Chemical modification of textiles or fibers or products thereof – Cellulose fibers
Patent
1997-06-12
1999-03-09
Diamond, Alan
Bleaching and dyeing; fluid treatment and chemical modification
Chemical modification of textiles or fibers or products thereof
Cellulose fibers
8121, 81161, 4273899, 427391, 427392, 427394, 4273934, 427395, 427396, 442 94, 442 95, 428364, 428365, D06M 13188, D06M 15277
Patent
active
058794085
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/JP95/02559 filed Dec. 14, 1995.
1. Field of the Invention
The present invention relates to a method of stainproofing cellulose fibers and a stainproofed product.
2. Related Art
It has been known to use as a stainproofing agent a copolymer containing repeating units derived from a fluoroalkyl group-containing monomer and a monomer containing a hydrophilic group (e.g. Japanese Patent Kokoku Publication No. 35033/1977, Japanese Patent Kokai Publication No. 68006/1992 and U.S. Pat. No. 3,574,791).
A known stainproofing agent is effective for a synthetic fiber (e.g. polyester, nylon, etc.) or a mixed textile of a synthetic fiber and a cellulose fiber (e.g. cotton, etc.), but a satisfactory performance can not be obtained when only the cellulose fiber is treated. The cellulose fiber and textile in the present specification include cotton, hemp, viscose rayon, cupro-ammonium rayon and wood pulp, and a cloth, a non-woven fabric and a sheet, produced by using these.
A method of improving stainproof properties by treating with a copolymer having a specific composition after pretreating a polyester by a melamine crosslinking is suggested, this method is not directed to the cellulose fibers (Japanese Patent Kokai Publication No. 277887/1990).
SUMMARY OF THE INVENTION
An object of the present invention is to provide a method for stainproofing a cellulose fiber itself, and a stainproofed product.
The above object is accomplished by a method of stainproofing a cellulose fiber, which comprises the steps of: heterogeneous reaction system; and then emulsion of a copolymer containing repeating units derived from a fluroalkyl group-containing polymerizable compound and a compound represented by the general formula: is --CH.sub.2 CH.sub.2 --; R.sup.1 is a hydrogen atom or a methyl group; R.sup.2 is a hydrogen atom or an alkyl group having 1 to 8 carbon atoms; and each of m and n is an integer of 0 to 50, provided that m+n is an integer of 1 to 70.
The object of the present invention is also accomplished by a stainproofed product obtained by the above stainproofing method.
It has hitherto been difficult to impart stainproofing properties to the cellulose fiber, but it is possible to impart stainproof properties to the cellulose fiber by the method of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, the moiety represented by XO and YO in the above formula (I) may be block or random.
In the method of the present invention, a part of hydroxyl groups of a cellulose fiber is esterified in a heterogeneous reaction system in the first step.
In this step, it is important to esterify the cellulose fiber while the intrinsic form of the cellulose fiber is maintained.
When a degree of esterification is represented by a degree of substitution (D.S.) defined below, it is preferably from 0.01 to 1.5, particularly from 0.03 to 1.3. When the degree of substitution is smaller than 0.01, the effect for imparting stainproof properties is poor. On the other hand, when it is larger than 1.5, intrinsic characteristics of the cellulose fiber such as moisture absorption properties, feeling, etc. are deteriorated.
Degree of substitution (D.S.)=average value of the number of esterified hydroxyl groups per one glucose moiety
As the compound used for esterification, a fatty acid having C.sub.1-20 alkyl group or a derivative thereof are preferred, but an aromatic carboxylic acid such as benzoic acid or a derivative thereof can also be used. Examples of an esterifying agent include a carboxylic acid, a carboxylic anhydride, a carboxylic acid chloride and a ketene.
The esterification reaction can be conducted in a liquid phase by optionally using a solvent and/or a catalyst. However, it is important to select the system in which a formed cellulose ester does not dissolve, that is, to select the system so that the reaction is conducted with maintaining the fiber state.
When the esterification is conducted by using acetic acid having a comparatively low boiling point, or a derivative t
REFERENCES:
patent: 1861320 (1932-05-01), Rheiner
patent: 3574791 (1971-04-01), Sherman et al.
patent: 3919183 (1975-11-01), Jager et al.
A.J. Hall, "The Standard Handbook of Textiles," pp. 43-53, (month unknown), 1975.
A.J. Hall, "The Standard Handbook of Textiles," pp. 49-50, (month unknown), 1975.
Enomoto Takashi
Kubo Motonobu
Daikin Industries Ltd.
Diamond Alan
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