Patent ID: 11866525
Assignee: ARCHROMA IP GMBH
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  D | IPC C  D

Claim 1:
2. Method according to claim 1, wherein in the at least one water-soluble diaminostilbene disulphonic optical brightener of formula (1)
R1 and R6 signify independently from each other hydrogen, methyl, linear or branched C1 to C4 hydroxyalkyl or CH2CH2CONH2,
R2 and R4 signify independently from each other hydrogen, linear or branched C1 to C4 alkyl, linear or branched C1 to C4 hydroxyalkyl, CH2CH2CONH2 or CH2CH2CN,
R3 and R5 signify independently from each other linear or branched C1 to C4 alkyl, linear or branched C1 to C4 hydroxyalkyl, CH(CO2M)CH2CO2M, CH(CO2M)CH2CH2CO2M, benzyl or
R2 and R3 signify together with their neighbouring nitrogen atom a morpholino ring and/or
R4 and R5 signify together with their neighbouring nitrogen atom a morpholino ring, and
R7 and R8 signify independently from each other hydrogen or methyl.