Dyeing process and auxiliary
AssigneeClariant Finance (BVI) Limited
InventorHans-Peter Baumann
Life of this patent
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Abstract
Dyeing of cellulosic substrates with reactive dyes in the presence of at least 20 g/l of sodium chloride, employing auxiliaries (E) of levelling activity, which are methylene-bridge-containing and sulpho-group-containing aromatic compounds, obtainable by condensation of defined sulphonation products with formaldehyde resp. formaldehyde-yielding compounds and optionally salt formation; (E)-contaning compositions that further contain at least one hydrotrope (H) and/or at least one sequestering agent (Q); and novel condensation products.
Claims7
A dyeing auxiliary composition for dyeing with reactive dyes, which contains an auxiliary (E), and a sequestering agent (Q) and optionally a hydrotrope (H), (E) being a methylene-bridge-containing and sulpho-group-containing aromatic product or mixture of products, that is obtainable by sulphonation of
- (a) at least one aromatic hydrocarbon compound with 9 to 18 carbon atoms, to introduce on average at least 1.1 sulpho groups per molecule of (a), and of
- (b) at least one optionally alkyl-substituted diphenyl(thio)ether, to introduce on average at least 1.1 sulpho groups per molecule of (b), and condensation of the sulphonation products of (a) and of (b) with (c) formaldehyde or a formaldehyde-yielding compound in acidic medium, and optionally salt formation.
An aqueous concentrate composition for dyeing with reactive dyes, comprising water and 10-80% by weight dry substance, said dry substance being a mixture of a dyeing auxiliary (E) with a sequestering agent (Q) and optionally a hydrotrope (H), (E) being a methylene-bridge-containing and sulpho-group-containing aromatic product or mixture of products, that is obtainable by sulphonation of
- (a) at least one aromatic hydrocarbon compound with 9 to 18 carbon atoms, to introduce on average at least 1.1 sulpho groups per molecule of (a), and of
- (b) at least one optionally alkyl-substituted diphenyl(thio)ether, to introduce on average at least 1.1 sulpho groups per molecule of (b), and condensation of the sulphonation products of (a) and of (b) with (c) formaldehyde or a formaldehyde-yielding compound in acidic medium, and optionally salt formation;
- the weight ratio of (Q) to (E) being 8 to 60 parts by weight Q for every 100 parts of E.
Dependencies are inferred from the claim text.