Optical brightening of polyamides

Details Optical brightening of polyamides Optical brightening of polyamides

D - Textiles, Paper

06

L

8/52

D06L 3/12 (2006.01)

Patent

CA 1103407

IMPROVEMENTS IN OR RELATING TO ORGANIC COMPOUNDS Abstract of the Disclosure Disclosed is an optical briqhtening process for substrates comprising or consisting of synthetic poly- amide in which the optical brightener is applied to the substrate by impregnation followed by heat treatment and wherein the brightener is applied in the presence of a compound or mixture of compounds of formula I, RNH2 I wherein R is -OH, -NR1R2 or -NH?-NHR1 X being O, S or NH, and R1 and R2 being, independently, hydrogen, C1-6alkyl or C2-4hydroxyalkyl, which compounds are in free base or acid addition salt form or, when R is OH, in O-sulphonic acid form, and preparations for use in such process.

271283

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