01/2017 - 2017
Optical brighteners for cellulosic fibres are often lightsensitive. This phenomenon concerns brighteners of the classic DAS-type. Light transforms the trans-form of the molecule into the cis-form. This shifts the absorption/emission spectrum of the optical brightener into an area of shorter wave length. The light radiated from the optical brightener is invisible, the white effect negated.
ADVANTAGES OF ®RUCO-BLANC OPTICAL BRIGHTENERS FOR CO:
On PES fibres mainly derivatives of benzoxazole or benzimidazole are used. With these types the best fastness levels are obtained.
ADVANTAGES OF ®RUCO-BLANC OPTICAL BRIGHTENERS FOR SYNTHETICS