Combined warp sizing and fixing agent and new method for fixing sulfur dyestuffs on warp

A warp sizing and fixing agent comprising a:

• a) cationic starch substituted with quaternary ammonium groups,
• b) a cationic fixing agent and optionally
• c) additional sizing additives,
• wherein the cationic starch (a) has the formula (1a) or (1b)
• wherein
• R1, R2 and R3 are identical or different and are C1-C6-alkyl, C6-C10-aryl or C7-C12-aralkyl, wherein said alkyl, aryl and aralkyl groups are optionally substituted with hydroxyl, methyl, ethyl, methoxy, ethoxy, nitro, fluoro, chloro, bromo, cyano or carboxymethyl;
• X is a halogen, and
• R4 is an alkylene group or a hydroxyalkylene group each having 2 to 5 carbon atoms:
• R5 is hydrogen or a C1-C6-alkyl group optionally substituted with hydroxyl, methoxy, ethoxy, fluoro, chloro, bromo or nitro, and
• wherein the cationic fixing agent comprises an organic compound having the following general formula (2):
• wherein
• A is an alkylene having 1 to 6 carbon atoms optionally substituted by halogen, hydroxy, C1-C4-alkoxy, or nitro groups;
• or A stands for alkylene having 1 to 6 atoms having incorporated one or more heteroatoms N, S or O, and R10 to R60 stand independently from each other for optionally substituted C1-C4-alkyl groups, optionally substituted C1-C4-alkenyl groups, wherein the substituents are cyano, hydroxyl, C1-C4-alkylamino, methoxy, ethoxy, F, Cl or Br;
• or
• R10 and/or R40 are hydrogen or an electron pair;
• or
• R10 to R60 are bridged with each other thereby constituting a ring system.