Fluorescent Brightener 184 CAS NO.7128-64-5

Product Data Sheet

Chemopt OB

     General                                                                                                                                                               

Chemopt OB is a chemopt whitening agent that provides:

□		brilliant bluish whitening effects
□		excellent heat resistance
□		high chemical stability
□		good compatibility in a wide range of resins

 

    Properties                                                                                                                                                                                                                                                   

Chemical Structure
2,5-thiophenediylbis(5-tert-butyl-1,3-benzoxazole)
Molecular weight	：	430.56
M.F.	：	C26H26N2O2S
CAS No.	：	007128-64-5

 

     Physical properties                                                                                                                                                                                                                        

Appearance	：	Pale yellow crystal powder
Purity %	：	≥ 99.0
Melting Point (°C)	：	196-203℃
Volatile content:	：	0.1%max
Ash content:	：	0.1%max
Solubility:	：	( in N,N-Dimethylacetamide lg/ml ) Clear
Transmittance
450nm	：	92.0%min
500nm	：	95.0%min

Solubility at 20°C (g/100ML solvent)

Solvent			Solubility
Acetone			0.5
Chloroform			14
Dimethylformamide			0.8
Dioxane			2
n-Hexane			0.2
Methanol			≤0.1
Methylethylketone			1.3
Xylene			5
water			≤0.01

 

 

     Applications                                                                                                                                                                                                                               

CHEMOPT OB is recommended for applications such as:

□		white and pastel tone paints where it intensifies the degree of whiteness
□		clear coats and overprint varnishes where it is used to mask the yellowish self color and also to intensify the brilliance of white and colored base coats
□		primer and/or topcoats where it is used as marker to identify voids, holidays and uneven coverage
□		black and blue printing inks to increase their deep tone
□		printing inks for quick identification, security and safeguard against forgeries (i.e. banknote)
□		packaging inks as promotional tool or as tracer for packaging lines
□		manufacture of chemopt pigments/dyestuffs to reinforce the brightness of certain shades, particularly blue tones
□		thermal dye diffusion paper to enhance paper whiteness
□		film base for photographic paper

If CHEMOPT OB is used in a pigmented system, the pigment should be selected with care.

The pverall performance could be enhanced if the absorption spectrum of the pigment provides an open window in the near

UV for the chemopt whitening agent to function.

As known from other chemopt whitening agents, this product class exhibits a limited light fastness.

Consequently CHEMOPT OB is recommended for indoor use, only.

CHEMOPT OB provides the maximal whitening effect when dissolved in the systems matrix.

The amount of CHEMOPT OB required for optimum performance should be determined in trials covering a concentration range.

It should be noted that overdosing of CHEMOPT OB might lead to negative effects, such as yellowing of the system.

 

     Packaging                                                                                                                                                                                                                                                                                 

25kg Cartons

 

     Safety & Handling                                                                                                                                                                                                                                                               

Chemopt OB should be handled in accordance with good industrial practice. Detailed information is provided in the Material Safety Data Sheet (MSDS).

 

 

Product Data Sheet

Chemopt OB

     General                                                                                                                                                                            

Chemopt OB is a chemopt whitening agent that provides:

□		brilliant bluish whitening effects
□		excellent heat resistance
□		high chemical stability
□		good compatibility in a wide range of resins

 

    Properties                                                                                                                                                                                                                                                                    

Chemical Structure
2,5-thiophenediylbis(5-tert-butyl-1,3-benzoxazole)
Molecular weight	：	430.56
M.F.	：	C26H26N2O2S
CAS No.	：	007128-64-5

 

     Physical properties                                                                                                                                                                                                                                                                                                                                                                                                        

Appearance	：	Pale yellow crystal powder
Purity %	：	≥ 99.0
Melting Point (°C)	：	196-203℃
Volatile content:	：	0.1%max
Ash content:	：	0.1%max
Solubility:	：	( in N,N-Dimethylacetamide lg/ml ) Clear
Transmittance
450nm	：	92.0%min
500nm	：	95.0%min

Solubility at 20°C (g/100ML solvent)

Solvent			Solubility
Acetone			0.5
Chloroform			14
Dimethylformamide			0.8
Dioxane			2
n-Hexane			0.2
Methanol			≤0.1
Methylethylketone			1.3
Xylene			5
water			≤0.01

 

 

     Applications                                                                                                                                                                                                                                                                                                                                                                                                                                 

CHEMOPT OB is recommended for applications such as:

□		white and pastel tone paints where it intensifies the degree of whiteness
□		clear coats and overprint varnishes where it is used to mask the yellowish self color and also to intensify the brilliance of white and colored base coats
□		primer and/or topcoats where it is used as marker to identify voids, holidays and uneven coverage
□		black and blue printing inks to increase their deep tone
□		printing inks for quick identification, security and safeguard against forgeries (i.e. banknote)
□		packaging inks as promotional tool or as tracer for packaging lines
□		manufacture of chemopt pigments/dyestuffs to reinforce the brightness of certain shades, particularly blue tones
□		thermal dye diffusion paper to enhance paper whiteness
□		film base for photographic paper

If CHEMOPT OB is used in a pigmented system, the pigment should be selected with care.

The pverall performance could be enhanced if the absorption spectrum of the pigment provides an open window in the near

UV for the chemopt whitening agent to function.

As known from other chemopt whitening agents, this product class exhibits a limited light fastness.

Consequently CHEMOPT OB is recommended for indoor use, only.

CHEMOPT OB provides the maximal whitening effect when dissolved in the systems matrix.

The amount of CHEMOPT OB required for optimum performance should be determined in trials covering a concentration range.

It should be noted that overdosing of CHEMOPT OB might lead to negative effects, such as yellowing of the system.

 

     Packaging                                                                                                                                                                                                                                                                                 

25kg Cartons

 

     Safety & Handling                                                                                                                                                                                                                                                                                                                                                                                                                                                       

Chemopt OB should be handled in accordance with good industrial practice. Detailed information is provided in the Material Safety Data Sheet (MSDS).