Preparation of leuco vat dyes in granulated form and processes for forming leuco vat dye preparations and for dyeing cellulosic material

摘要

PCT No. PCT/EP97/02912 Sec. 371 Date Dec. 18, 1998 Sec. 102(e) Date Dec. 18, 1998 PCT Filed Jun. 5, 1997 PCT Pub. No. WO97/48770 PCT Pub. Date Dec. 24, 1997Granules comprising as essential constituents a leuco vat dye, an alkali metal hydroxide and a mixture of from 10 to 100% by weight of an alpha -hydroxy-C1-C4-alkylsulfinic acid, one of its salts or derivatives and from 0 to 90% by weight of hydrosulfite as reductant, are prepared and used for dyeing cellulosic textile material.