LIGHT STABILIZER 944 (CAS:71878-19-8)

Characterization 

Light stabilizer 944 is a high molecular weight hindered amine light stabilizer (HALS). It shows excellent compatibility, good resistance to extraction and low volatility.

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]])  

CAS number

71878-19-8  

Structure 

Light stabilizer 944

Molecular weight 

Mn = 2000 – 3100 g/mol

Applications 

Light stabilizer 944 areas of application include polyolefins (PP, PE), olefin copolymers such as EVA as well as blends of polypropylene with elastomers. In addition, in certain instances Light stabilizer 944 is highly effective in polyacetals, polyamides, polyurethanes, flexible and rigid PVC, as well as PVC blends, and in certain styrenic elastomer and adhesive specialty applications.

Features/benefits 

Light stabilizer 944 imparts excellent light stability to thin articles, particularly  fibers and films. In thick cross sections it is specifically suitable for  polyethylene articles. Light stabilizer 944 is highly effective as a long-term  thermal stabilizer in thin and thick articles and shows good extraction  resistance.

Product forms

FDL Appearance              white to slightly yellowish granules 

Appearance                    white to slightly yellowish low dust powder

Guidelines for use 

Fibers                           UV Stabilization of PP                              0.1 – 1.4 %

Tapes                          UV Stabilization of PP and HDPE            0.10 – 0.8%  

Thick sections             UV Stabilization of HDPE, LLDPE,            0.05 – 1.0% 

                                    LDPE and PP 

Films                            UV Stabilization of LLDPE and LDPE       0.1 – 1.0 % 

The presence of a UV absorber (e. g. Lotsorb UV 326/328 )  is recommended for unpigmented or slightly pigmented articles or to improve  the light fastness of certain organic pigments.

Physical Properties 

Melting range                                 100-135 °C

Flashpoint (ASTM D-93)                > 150 °C 

Specific gravity (20°C)                   1.01 g/cm3 

Vapor pressure (20°C)                   ~ 1.0 E-6Pa

Solubility (20°C)                                       %W/W

Acetone                                 > 50    

Chloroform                           > 30

Ethanol                                 < 0.1

Ethyl acetate                        > 50

n-Hexane                              41

Methanol                              3

Dichloromethane                > 50

Toluene                               > 50 

Water                                  < 0.01

Volatility                               TGA on pure substance; heating rate  20°C/min in air 

Temperature (°C)                  Weight loss (%)     

250                                       0

275                                       0.2

300                                       1.0

325                                       3.7

350                                       9.4

Packaging and handling 

Packaging: 25Kg/Carton       

Store the product in a cool, dry, well-ventilated area away from incompatible materials. Unless stated, proper storage will permit usage of the product for 12 months from the manufacture date. For additional handling and toxicological information, consult the Material Safety Data Sheet.