Patent ID: 7687612

Claim:
A reactive dyestuff with a dialkylether bridge group of the following formula (I), wherein, E 1 and E 2 each independently are couplers selected from the group consisting of benzene, naphthalene, pyrazolone, monoazo, disazo, polyazo and metal complex azo components; (R 1 ) 0-3 and (R 2 ) 0-3 each independently are 0 to 3 identical or different groups, and each of R 1 and R 2 independently is selected from the group consisting of hydrogen, halogen, hydroxyl, carboxyl, sulfo, nitro, cyano, C 1-4 alkyl, C 1-4 alkoxy, ureido and amido; B and B′ each independently are selected from the group consisting of a direct bond, —SO 2 — and —CONH—(CH 2 ) k —SO 2 —; k is an integer between 1 to 6; Z and Z′ each independently are selected from the group consisting of —SO 2 —U, —CONH—(CH 2 ) d —SO 2 —U, —O—(CH 2 ) r —CONH—(CH 2 ) d —SO 2 —U, β-thiosulfatoethylsulfonyl and —N(R′)—U′; d and r are integers independent of one another between 2 to 4; U is —OH, —CH 2 CH 2 OH, —CH 2 CH 2 W or —CH═CH 2 ; W is a leaving group, —Cl, —OSO 3 H or —OPO 3 H, which is eliminable by a base, a qualter salt selected from the group consisting of quaternary ammonium, pyridine, carboxypyridinium, methylpyridinium and carbonamidopyridinium, or a group of R 3 and R 4 each independently are hydrogen or C 1-4 alkyl; U′ is α,β-halopropionyl, α-haloacryloyl, β-halopropionyl or α-haloacryloyl; R′ is hydrogen or C 1-4 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 1 to 4.