Museum Groot Heiligland 62 2011 ES Haarlem The Netherlands Images are available via: http://www.
For coating applications, the most important HALS
types are di-functional piperidine derivatives linked by diesters or triazine rings as shown in Fig.
Uvasils 299, 2000, 2006, and 2007 are a new generation of oligomeric HALS
based on a siloxane backbone.
Mike will join Hal
on stage at the Millennium Forum in Derry and the TF Theatre in Castlebar.
Conventional N-H, tetramethylpiperidine-based HALS
provide excellent UV stability.
Sanduvor PR-31 HALS
stabilizer acts as a radical scavenger, stabilizing polymers against photo-oxidative degradation, and has uv absorbing properties based on its benzylidene malonic ester group.
Also new is FS-812, a mixture of HMW and LMW HALS
plus a benzotriazole uv absorber and hydroxylamine processing stabilizer.
In their aim to invent stabilizers that are both highly soluble in resins and have very low extractability, some additive suppliers have focused their R&D on polymer-bound HALS
Common stabilizers such as phenolic antioxidants and oligomeric HALS
are typically nonpolar, hydrophobic substances designed primarily for compatibility with polyolefins, explains Webster.
Ciba Additives has added three new low-dusting HALS
to its Performance Plus product line for polyolefins.
A new HMW monomeric HALS
from Ciba Additives, Ciba-Geigy Corp.
Despite its relatively high unit price, Gimbarski expects it to be competitive in cost-performance with standard HALS
because it can be used at lower levels.