Novel reactive dyestuff with N,N-dialkylamino bridge group

A reactive dyestuff with an N,N-dialkylamino bridge group of the following formula (I),

• wherein, E1 and E2 each independently are couplers selected from the group consisting of benzene, naphthalene, pyrazolone, monoazo, disazo, polyazo and metal complex azo components;
• R is hydrogen, C1-4 alkyl, C1-4 alkylcarbonyl, phenyl, nitroso or C1-4 alkyl substituted by halogen, hydroxyl, carboxyl or sulfo;
• (R1)0-3 and (R2)0-3 each independently are 0 to 3 identical or different groups, and each of R1 and R2 independently is selected from the group consisting of hydrogen, halogen, hydroxyl, carboxyl, sulfo, nitro, cyano, C1-4 alkyl, C1-4 alkoxy, ureido and amido;
• B and B′ each independently are selected from the group consisting of a direct bond, —SO2— and —CONH—(CH2)k—SO2—;
• k is an integer between 1 to 6;
• Z and Z′ each independently are selected from the group consisting of —SO2—U, —CONH—(CH2)d—SO2—U, —O—(CH2)r—CONH—(CH2)d—SO2—U, β-thiosulfatoethylsulfonyl and —N(R′)—U′;
• d and r are integers independent of one another between 2 to 4;
• U is —CH2CH2W or —CH═CH2;
• W is a leaving group, selecting from the group consisting of —Cl, —OSO3H and —OPO3H, which is eliminable by a base, a quaternary salt selected from the group consisting of quaternary ammonium, pyridine, carboxypyridinium, methylpyridinium and carbonamidopyridinium, or a group of
• R3 and R4 each independently are hydrogen or C1-4 alkyl;
• U′ is α,β-halopropionyl, α-haloacryloyl, β-halopropionyl or α-haloacryloyl;
• R′ is hydrogen or C1-4 alkyl;
• i and j are integers independent of one another between 0 to 2, and the sum of i and j is not 0;
• and
• m and n are integers independent of one another between 2 to 4.