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NIR-Photosensitive Dyes

SHOWA DENKO K.K. provides dyes that can absorb lights the wavelengths of which are in the region of near infrared rays (NIRs). The dyes can be used as an NIR-absorbing material. Moreover, they can cause polymerization and decoloration when used in combination with specific organic borates and a long-wave light.


Structure & Absorption spectrum
SHOWA DENKO 's IRT@can absorb lights whose wavelengths are up to 817-820 nm and has second absorption band at around 640 nm.
This molar absorption coefficient is larger than 105.

Structure
Fig

Grade IR-T
X N(C2H5)2
Y N(C2H5)2
Z-
CAS No. 96233-24-8
ă1st(nm)*1
(ƒÃ~10-5)
817
1.33
ă2nd(nm)*1 640
*1) Acetonitrile

Absorption spectrum



Applications
When used in combination with specific organic borates, our NIR-photosensitive dyes can cause polymerization and decoloration, as follows:

fig

(1)Polymerization
RE + M(Monomer) ¨

RME

RM + M ¨ RMnE

(2)Decoloration
RE + DyeE ¨

Dye-R
Colorless

P3B (An organic borate)
P3B (An organic borate)



œ The dyes can also be used for applications other than the above. œ


The information contained herein is based upon data considered true and accurate. However, SHOWA DENKO K.K. accepts
no responsibility for any liability or risk which may result from the handling and use of products.





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