MPI Chemie

Optical brighteners

MPI Bright optical brighteners (OB) are fluorescent whitening agents, designed to brighten colours or mask yellowing in plastics, lacquers, paints, inks, photo-processing solutions and fibres. They function by absorbing invisible ultraviolet radiation and re-emitting it as visible light in the blue range of the spectrum. Optical brighteners are particularly effective in masking the yellowish cast sometimes observed in plastics and fibres after high temperature processing operations. They are also used in substrates containing pigments or dyes to make the colours appear more brilliant.

Product overview

MPI brandname CAS nr. Chemical name
MPI Bright 100 (OB) 7128-64-5 2,5-thiophenediylbis(5-tert-butyl-1,3-benzoxazole)
MPI Bright 200 (OB-1) 1533-45-5 2,2'-(vinylenedi-p-phenylene)bisbenzoxazole
MPI Bright 420 (KCB) 5089-22-5 2,2'-(naphthalene-1,4-diyl)bis(benzoxazole)
MPI Bright 450 (KSN) 5242-49-9 2-[4-[2-[4-(benzoxazol-2-yl)phenyl]vinyl]phenyl]-5-methylbenzoxazole
MPI Bright FP 127 40470-68-6 4,4'-bis(2-methoxystyryl)-1,1'-biphenyl

* Please enquire for additional types and mixtures