Lanasol dyes

These constraints cause different reactive groups to be developed for dyeing wool. They fall into two groups novel reactive groups with more than one type of group in each molecule in order to increase the amount of dye fixed and minimise the wash-off problem, eg, Lanasol Dyes by CIBA-GEIGY, and those based on ceUulosic reactive dyes, but where the dye is appHed to the wool in a nonreactive form. On boiling, this form slowly converts to the reactive form that fixes rapidly in situ eg, the Hostalan Dyes by Hoechst, introduced in 1971 were precursors of vinyl sulfone dyes. 

There are relatively few other reactive groups which react by nucleophilic addition and which have achieved significant commercial success. However, one particular system which is worthy of note is the a-bromoacrylamido group, found in the Lanasol dyes (Ciba), which are among the most widely used reactive dyes for wool. The chemistry... 

Lamination, paper, 18 125 Lamination inks, 14 327-328 Lampblacks, 4 762, 798t manufacture, 4 786-787 Lamproite pipes, 8 519, 520 Lanacordin, molecular formula and structure, 5 98t Lanasol dyes, 9 468, 469 Lance bubbling equilibrium (LBE) process, 23 260... 

This type is marketed as the Remalan range (Hoechst). The Primazin (BASF) dyes embody the acrylamide group —NHCOCH=CH2 or a precursor. The Procilan dyes (ICI) employ the acryloylamino group attached to 1 2-nickel or -cobalt azo complex. The Lanasol dyes (CGY) use the a-bromoacryloylamino group D—NHCOC=CH2. The Drimalan (S) and... 

The new range of Lanasol CE (Ciba) metal-free reactive dyes for wool has been developed to offer the option of replacing chrome dyes in full depths by cost-effective alternatives. These five dyes (yellow, red, blue, navy and black) are based on the a-... 

Lanasol. [Ciba-Geigy/Dyestuffis] Textile dyes and pigments. 

---