Patent GB-941554-A (GB)
Title: New sulphonated stilbene derivatives having optical brightening power
Inventor: SCHWALENBERG ALBERT
Filed: 1960-02-01
Abstract: The invention comprises stilbene derivatives of the formula <FORM:0941554/C2/1> in which R represents a C1-4 primary alkyl radical and X and Y represent the same primary or secondary aliphatic or aromatic amino group or Y represents a primary aromatic amino group and X represents a different primary aromatic amino group or a primary or secondary aliphatic amino group.  The compounds may be prepared in one method by reacting together in the presence of an acid binding agent, one molar proportion of the disodium salt of 4:41-diamino-stilbene-2:21-disulphonic acid and either two molar proportions of a reaction product derived from equimolar amount of a C1-4 primary alkoxylated-4:6-dichlorotriazine and a primary or secondary aliphatic or aromatic amine, or one molar proportion of a reaction product derived from equimolar amounts of said alkoxylated dichlorotriazine and a primary aromatic amine and one molar proportion of a reaction product derived from equimolar amounts of the same alkoxylated dichlorotriazine and a different primary aromatic amine or a primary or secondary aliphatic amine. Alternatively, the products may be prepared by reacting together in the presence of an acid binding agent, either two molar proportions of a primary or secondary aliphatic or aromatic amine, or one molar proportion each of a primary aromatic amine and a different primary aromatic amine or primary or secondary aliphatic amine, with one molar proportion of the reaction product derived from two molar proportions of a C1-4 primary alkoxylated-dichloro-triazine and one molar proportion of the disodium salt of 4:41-diamino stilbene-2:21-disulphonic acid.  The alkoxylated dichlorotriazines may be prepared by reacting cyanuric chloride with a C1-4 alkanol in the presence of an acid binding agent.  In examples :(1) cyanuric chloride is reacted in aqueous Na CO3 successively with methanol and ethanolamine, or further quantity of cyanuric chloride is similarly reacted with methanol and aniline and the two products are mixed and reacted with disodium 4 : 41-diamino stilbene 2 : 21-disulphonate in aqueous Na2CO3 yielding a desired product wherein R=CH3, Y=aniline and X=monoethanol amino; (2) the same product is obtained by reacting cyanuric chloride with methanol in aqueous Na2CO3, then adding an aqueous sodium bicarbonate solution of disodium 4:41-diamino-2:21-disulphonate and finally reacting the product with a mixture of aniline and ethanol amine.  Other stilbene derivatives are described wherein R=CH3 and X and Y are presented as appropriate by ethanol amino, diethanol amino, aniline, o- and p-toluidino, o- and p-anisidino and p-xylidino and dimethyl aniline.  The compounds may be used in brightening cellulose, polyamide or other organic fibrous material.ALSO:Organic fibrous material e.g., cellulose or poly amide fibre, is optically brightened by treatment with a compound having the general formula <FORM:0941554/D1-D2/1> wherein R represents a primary C1-4 alkyl radical and X and Y represent the same primary or secondary aliphatic or aromatic amino group or Y represents a primary aromatic amino group and X represents a different primary aromatic amino group or a primary or secondary aliphatic amino group.  Aminos specified whose residues may represent X or Y are mono- and di-ethanolamines, aniline, o- and ptoluidine, o- and panisidine pxylidene and 2 : 5-dimethyl aniline.