Azo dyes, their preparation and use

Claim 2

An azo dye of the formula ##STR40## wherein D is a diazo component of the benzene or naphthalene series which contains a sulfonic acid group and a fiber-reactive radical, capable of reacting with the hydroxyl groups of cellulose or with the amino groups of natural or synthetic polyamides with the formation of covalent chemical bonds therewith, said fiber-reactive radical bonded to a ring carbon atom of D via an --N(R)--group, in which R is hydrogen or alkyl of 1 to 4 carbon atoms, a --CH 2 --NH--bridge or an ##STR41## bridge, R 1 is hydrogen or an alkyl radical having 1 to 4 carbon atoms, R 2 is an alkyl radical having 1 to 4 carbon atoms and X is a substituted or unsubstituted alkyl or alkenyl radical.

Claim 3

An azo dye of claim 1, wherein D contains 1 to 3 sulfonic acid groups and zero to at least one substituent selected from the group consisting of methyl, chlorine, nitro, methoxy, ethoxy, phenoxy, hydroxyl, carboxyl, methoxycarbonyl, ethoxycarbonyl, acetyl, acetylamino, benzoylamino and carbamoyl, R 1 is a hydrogen atom or an alkyl radical having 1 to 4 carbon atoms, R 2 is an alkyl radical having 1 to 4 carbon atoms and X is an alkyl radical having 1 to 4 carbon atoms.

Claim 4

An azo dye of claim 2, wherein D is of the benzene series and contains 1 to 2 sulfonic acid groups and zero to at least one substituent selected from the group consisting of methyl, chlorine, methoxy, ethoxy, carboxyl, acetyl, acetylamino and benzoylamino, and R 1 is an alkyl radical having 1 to 4 carbon atoms.

Claim 5

An azo dye of claim 3, wherein R 1 is ethyl, R 2 is methyl and X is methyl.

Claim 6

An azo dye of claim 1, wherein D contains 1 to 3 sulfonic acid groups and zero to at least one substituent selected from the group consisting of methyl, chlorine, methoxy, ethoxy, carboxyl, acetylamino, benzoylamino, --NH 2 , methylamino, ethylamino, phenylamino, ureido and hydroxyl; the fiber-reactive group is bonded to ring carbon atoms of D via an --N(R)--bridge; R 1 is a hydrogen atoms or an alkyl radical having 1 to 4 carbon atoms; R 2 is an alkyl radical having 1 to 4 carbon atoms; X is a substituted or unsubstituted alkyl or alkenyl radical; and R is hydrogen or alkyl having 1 to 4 carbon atoms.

Claim 7

An azo dye of claim 5, wherein D is of the benzene series and contains 1 to 2 sulfonic acid groups and zero to at least one of the substituents selected from the group consisting of methyl, chlorine, methoxy, ethoxy, carboxyl, acetylamino, benzoylamino, phenylamino and ureido, R 1 and R 2 independently of one another are each an alkyl radical having 1 to 4 carbon atoms, and X is alkyl radical having 1 to 4 carbon atoms.

Claim 8

An azo dye of claim 6, wherein R 1 is ethyl, R 2 is methyl and X is methyl.

Claim 9

An azo dye of claim 1, wherein D is of the benzene series and contains 1 to 2 sulfonic acid groups and zero to at least one of the substituents selected from the group consisting of methyl, chlorine, methoxy, ethoxy, carboxyl, acetylamino, benzoylamino, phenylamino and ureido, R 1 and R 2 independently of one another are each an alkyl radical having 1 to 4 carbon atoms, and X is an alkyl radical having 1 to 4 carbon atoms, wherein the fiber reactive group is bonded to a ring carbon atom of D via an --N(H)--or --CH 2 NH-bridge, and wherein the fiber reactive group is selected from the group consisting of α,β-dibromopropionyl, α-bromoacryl, 2,6-dichloro-5-methylsulfonyl-pyrimid-4-yl, 2,6-difluoro-5-chloro-pyrimid-4-yl 2,4,5-trichloropyrimid-6-yl, 2,4-dichloro-s-triazin-6-yl, 2-chloro-4-amino-s-triazin-6-yl, 2-chloro-4-sulfophenylamino-s-triazin-6-yl, 2-chloro-4-sulfonaphthylamino-s-triazin-6-yl, 2-chloro-4-isopropoxy-s-triazin-6-yl, 2-fluoro-4-sulfophenylamino-s-triazin-6-yl, 2-chloro-4-[ 4'-(2,4-dichloro-s-triazin-6-ylamino)-3'-sulfo-phenylamino]-s-triazin-6-yl and 2-chloro-4-[4'-(2-chloro-4-amino-s-triazin-6-ylamino)-3'-sulfophenylamino]-s-triazin-6-yl radical, provided that the --CH 2 NH--bridge is only selected when the fiber-reactive group is α,β-dibromopropionyl.