Ultraviolet absorbent UV- 783
Characterization
UV 783 is a synergistic mixture of light stabilizer 944 and LS 622. It is a versatile light stabilizer with good extraction resistance, low gasfading and low pigment interaction. UV 783 is particularly well suited for LDPE, LLDPE, HDPE films, tapes and thick sections and for PP films. It is also the product of choice for thick sections where indirect food contact approval is required.
Chemical name:
Poly[[6-[(1,1,3,3-tetramethylbutyl)amino]-1,3,5-triazine-2,4diyl][(2,2,6,6-tetramethyl-4-piperidinyl)imino]-1,6-hexanediyl[(2,2,6,6-tetramethyl-4-piperidinyl)imino]])
LS 622: Butanedioic acid, dimethylester, polymer with 4-hydroxy- 2,2,6,6-tetramethyl-1-piperidine ethanol
Structure light stabilizer 944
Molecular weight Mn = 2000 3100 g/mol
Structure LS 622
and
Molecular weight Mn = 3100 4000 g/mol
Product forms Appearance: white to slightly yellow pastilles
Guidelines for use
Thick sections*: UV stabilization of HDPE, LLDPE, 0.05 1 %
LDPE and PP
Films*: UV stabilization of LLDPE and PP 0.1 1.0 %
Tapes: UV stabilization of PP and HDPE 0.1 0.8 %
Fibers: UV stabilization of PP 0.1 1.4 %
* The presence of a UV absorber (UV326/328 or UV 81) is recommended in un-pigmented or slightly pigmented articles or to improve the light fastness of certain organic pigments.
Physical properties
Melting range: 55 140 °C
Flashpoint (DIN 51758): 192 °C
Bulk density: 514 g/l
Applications
UV 783 areas of application include polyolefins (PP, PE), olefin copoly- mers such as EVA as well as blends of polypropylene with elastomers, and PA.
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