Bleaching and dyeing; fluid treatment and chemical modification – Overall dimensional modification or stabilization – e.g.,... – Modification of molecular structure of substrate by chemical...
Patent
1982-02-03
1984-12-04
Tungol, Maria Parrish
Bleaching and dyeing; fluid treatment and chemical modification
Overall dimensional modification or stabilization, e.g.,...
Modification of molecular structure of substrate by chemical...
8125, 8184, 8185, 8186, D06M 124, D06M 122, D06M 102, D06P 156
Patent
active
044861974
DESCRIPTION:
BRIEF SUMMARY
It is common practice to impart easy care properties (for instance wet and/or dry crease resistance), to fabrics formed of cotton fibres or blends containing cotton fibres with, for instance, polyester fibres. Such methods involve the use of inter alia textile resins or cellulosic cross-linking agents. In PCT Patent Specification No. WO80/00463 a process is described for imparting easy care properties to linen products, optionally mixed with voscose.
It would be very desirable to be able to make a wide range of easy care products containing viscose but it has not previously been possible to achieve this by any convenient commercial methods.
Although viscose has certain inherent advantages as a fabric fibre it also suffers from serious disadvantages. Thus an untreated viscose fabric will not have satisfactory easy care properties, and for instance will readily crease. In an attempt at improving the easy care properties and in order to minimise loss of strength when wet and in order to minimise shrinkage it is common to apply a textile resin. However the amount that is applied has to be such that the resultant fabric loses some of the desirable properties of viscose and instead becomes rather harsh, especially when wet, and the easy care properties are still not entirely satisfactory.
Another disadvantage of viscose is that it has very poor dye receptivity, probably because when the viscose fibre is contacted with a dye the fibre swells and so reduces the capillary action that is necessary for reception of dye. Accordingly it is not possible to dye viscose fabrics by conventional continuous dyeing techniques.
Viscose is soluble in alkali and since many of the conventional treatments for giving easy care properties require alkali treatment it would be expected that they would result in destruction or damage of the fibres.
It has been alleged, in German Patent Specification No. 1173428, that good dry and wet resistance and soft hand on fabrics of native or regenerated cellulose can be obtained by treating the fabrics with a compound that evolves formaldehyde when heated followed by treatment with a solution containing 2 to 6% alkali and a glycol softener. In practice however this method does not give very satisfactory results when applied to viscose containing fabrics.
In British Patent Specification No. 1034453 a process is described of forming a bulked fabric by cross-linking viscose rayon fibre and then using this fibre to form a fabric which is then impregnated with caustic soda and then pulled back to full width. It is also mentioned that the cross-linking can be conducted on the fabric itself, but this is not exemplified and in fact it seems probable that the desired bulk effect would not be achieved if the cross-linking was conducted on the fabric instead of the free fibre.
The process has not been adopted commercially for the treatment of fabric and, prior to the present invention, there has been no known commercial process for making a fabric including substantial amounts of viscose fibres and that has an acceptable combination of dry and wet crease resistance and softness.
Although cellulosic fabrics are considered by many users to possess properties that make them preferable to synthetic fabrics for wear in hot humid conditions a disadvantage of many such fabrics is that they become less soft with increasing moisture. Accordingly although they may be very comfortable under moderate conditions of temperature and humidity at high humidity the softness of the fabric has been reduced, thus making the humidity more noticeable to the wearer.
It has been our object to devise a method of forming a fabric including viscose fibres and which has a good combination of wet crease resistance and softness and preferably also dry crease resistance.
In the invention a fabric that includes viscose fibres, generally in an amount of at least 30% by weight of the fibres in the fabric, is impregnated with an initial cross-linking agent and an activator for this, the agent is cured, the fabric is then mercerised while all
REFERENCES:
patent: 2988416 (1961-06-01), Wood
patent: 3090666 (1963-05-01), Jones
patent: 3457025 (1969-07-01), Barber et al.
patent: 3480382 (1969-11-01), Sloan et al.
patent: 3901014 (1975-08-01), Hiroi et al.
Reinhardt et al., American Dyestuff Reporter, vol. 47, Nov. 3, 1958, pp. 758-764.
Plotz, Jour. of the Textile Inst. Proceedings, vol. 53P, Jan. 1962, pp. 521-561.
Mark, H. ed., Chemical Aftertreatment of Textiles, Wiley Interscience, (1972), pp. 350-351.
Lintrend Licensing Company Limited
Rosen Lawrence
Tungol Maria Parrish
LandOfFree
Fibrous product containing viscose does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fibrous product containing viscose, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fibrous product containing viscose will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1580542