Patent ID: 7098319

Claim:
A disazo reactive dyestuff of the following formula (1), wherein R is hydrogen, C 1-4 alkyl-SO 3 H or C 1-4 alkyl-COOH; (W) 0˜3 and (W′) 0˜3 are each independently of one another 0 to 3 identical or different radicals selected from the group consisting of sulfo, C 1-4 alkyl and C 1-4 alkoxyl; Y 1 and Y 2 are each independently of the other a radical of formula —CH═CH 2 , —CH 2 CH 2 OSO 3 H or —CH 2 CH 2 —U, and at least one of the Y 1 and Y 2 is —CH 2 CH 2 —U, and U is a radical of the following formula (2a), (2b), (2c), (2d), or (2e) wherein R 1 , R 2 and R 3 are each independently of the other C 1-4 alkyl.