Vat dyes, their manufacture and their use

Details Vat dyes, their manufacture and their use Vat dyes, their manufacture and their use

C - Chemistry, Metallurgy

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C09B 1/20 (2006.01) C09B 1/467 (2006.01) C09B 1/48 (2006.01) C09B 3/00 (2006.01) C09B 5/00 (2006.01) C09B 5/42 (2006.01) D06P 1/22 (2006.01) D06P 1/24 (2006.01)

Patent

CA 1042883

A B S T R A C T of the Disclosure Vat dyestuffs of the formula Image (1) wherein R represents alkyl with 1 to 4 carbon atoms, R1 and R2 represent hydrogen or alkyl with 1 to 4 carbon atoms and each of A1 and A2 represents a vattable radical with 3 to 7 con- densed rings are characterised by improved resistance to alkali and are suitable for dyeing and printing the most diverse materials, in particular fibres made from natural or regenerated cellulose.

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