Ultraviolet absorbent UV-791
   Characterization                                  UV 791 is a synergistic mixture of light stabilizer 944 and LS 770.
It is an excellent light stabilizer especially for PP thick sections, which offers
excellent surface protection. It also shows high stabilization efficiency in PP
tapes.
 
CAS NO.                                                71878-19-8 / 52829-07-9
Chemical name Poly[[6-[(1,1,3,3-tetramethylbutyl)amino]-1,3,5-triazine-2,4-diyl][(2,2,6,6-tetramethyl-4-piperidinyl)imino]-1,6-hexanediyl[(2,2,6,6-tetramethyl-4-piperidinyl)imino]])
 
Structure                                           light stabilizer 944
 
        

                         
Molecular weight                              Mn = 2000 3100 g/mol
Structure                                           LS 770
 
and

 

 Molecular weight                              481 g/mol
 
Product forms                                        Appearance: white to slightly yellow granules, odorless
 
 
Guidelines for use                                  Thick sections*:              UV stabilization of PP                                0.1 0.8 %
Tapes:                          UV stabilization of PP                                0.1 0.8 %
 
* The presence of a UV absober (e. g. UV326/328 or UV 81) is recommended in unpigmented or slightly pigmented articles or to improve the light fastness of certain organic pigments.
 
Physical properties                           Melting range:                              approx. 55 °C start
Specific gravity (20 °C):                    1.0 1.2 g/cm3
Flashpoint:                                   > 150 °C
Vapor pressure (20 °C):                    < 0.01 Pa
 
 
 
Applications                                          UV 791 areas of application are PP, blends of polypropylene with elastomers and PA: It can also be used in styrenic polymers, e. g. ABS, impact polystyrene, etc.