Patent ID: 7232895

Claim:
A disazo red reactive dyestuff containing quaternary ammonium group of the following formula (1): wherein R′ is hydrogen, C 1 -C 4 alkyl or C 1 -C 4 alkoxyl, m is integer between 0 to 3, and each R′ independently is identical or different; R″ is hydrogen, C 1 -C 4 alkyl or C 1 -C 4 alkoxyl, n is integer between 0 to 2, and each R″ independently is identical or different; Y 1 and Y 2 are each independently of the other —CH 2 CH 2 OSO 3 H, —CH═CH 2 or —CH 2 CH 2 —U, and at least one of the Y 1 and Y 2 is —CH 2 CH 2 —U; U is a quaternary ammonium group.