Crease resistant finishes

Dyeing polyester/cotton with reactive and disperse dyes and imparting a crease-resist finish [327]. 

The earliest polymeric cationic aftertreatments stemmed from the development of crease-resist finishes for cellulosic fibres. One such, promoted specifically for its colour fastness improvements when applied as an aftertreatment to direct dyeings, was a condensation product of formaldehyde with dicyandiamide (Scheme 10.82). Many similar compounds followed, such as condensation products of formaldehyde with melamine (10.212), polyethylene imine) with cyanuric chloride (10.213) and alkyl chlorides with polyethylene imine) (10.214 R = alkyl). 

Reactive softeners Some softeners have functional groups that can react with the corresponding groups of some fibres, for example A-methylolated amines with the hydroxyl groups of cellulose (compare the mechanism of the crease resistance finish). The result is a very durable finish, combined with the typical advantages and disadvantages of this crosslinking chemistry, as discussed in Chapter 5. 

CNC POLYSOFT 35 is a non-ionic synthetic softener which can be used as a softener-lubricant on both pre-cure, post-cure and crease resistant finishes. 

Provides wrinkle and crease resistant finish to various textile fabrics. 

Wax emulsion, improves the abrasion properties of crease-resistant finished fabrics, improves the sewability lubricant for polypropylene ropes. 

Since the original Tootal patent there has been much research on alteration of the properties of cellulosic materials by the formation of polymers in situ. The original formaldehyde urea method for the crease-resistant finish is probably still -the most commonly used. Dimethylol-urea is now used as the monomer instead of a mixture of urea and formaldehyde. It is the product of the reaction of one molecule of lurea with two molecules of formaldehyde ... 

The quick-drying and crease-shedding properties of the synthetic yarns made domestic laundering much easier and eliminated the need for ironing. This created a demand for cellulosic goods with similar characteristics, and this was met by the so-called easy-care finishes. It will be apparent from the properties listed under (i), (vi), and (ix) that crease-resistant finishes can be adapted for drip-dry or wash-and-wear products. Mercerization or, better still, tension-free treatment with caustic soda before padding opens up the structure of the fibre and facilitates the entry of the precondensate. 

Resin or crease-resist finishes retard reduction with hydrosulphite and... 

Oh K.W. Jung E.J. Choi FI.-M., Nonformaldehyde crease-resistant finishing of ramie with glyoxal in the presence of a swelling agent. Textile Research Journal, 2001, 71, 3, 225-30. 

Cellulosics have certain deficiencies in properties that require finishing to improve these properties and maximize consumer usage and acceptance. The most important cellulosic finishes include crease resistant and stabilizing finishes, soil release and softening finishes (in conjunction with crease resistant finishes), oil and water repellant finishes, biologically protective finishes, and flame retardant finishes. 

---