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Novel UVA/HALS blend for high performance waterborne coatings

Kimpel D., Pirrung F.

Farby i Lakiery

2015

nr 5

16--20

The requirements in terms of outdoor durability in the joinery market have increased significantly over the last years. High performance waterborne dispersions have been developed for this purpose. BASF continues to develop products which can meet these stringent performance requirements. The first waterborne UVA/HALS blend using proprietary neat technology has been recently launched. This new product fulfills these high-end requirements as it is composed of a high performance UV absorber and a non-interacting HALS, making it compatible for all resin types, especially sensitive resins. This novel blend offers a superior photo-permanence and it not only improves the durability of the wood but also the performance of the wood coatings in terms of superior color and gloss retention. The neat technology allows an additional step forward in the reduction of VOCs. The new product is solvent-free and does not require any co-solvent for its addition into the formulation.

Effect of hindered amine light stabilizers on the resistance of polypropylene towards ionizing radiation

Przybytniak G., Mirkowski K., Rafalski A., Nowicki A., Legocka I., Zimek Z.

Nukleonika

2005

Vol. 50, nr 4

153-159

The influence of hindered amine light stabilizers (HALSs) on physical and mechanical properties of irradiated and non-irradiated isotactic polypropylene (PP) was studied. The stabilizers under investigation were: Tinuvin 765 (T765) and Tinuvin 622 (T622) - derivatives of 1,2,2,6,6-pentamethyl piperidine and Chimassorb 944 (C944) - a derivative of 2,2,6,6-tetramethyl piperidine. It was found that the stabilizers reduce the amount of peroxyl radicals in the amorphous phase of PP. The irradiation with electron beam causes a drop of apparent viscosity both in the original and in the modified PP however the effect is smaller in the presence of HALSs. Admixture of T622 and T765 stabilizers increases the crystallization temperature of non-irradiated PP by about 8 10°C (measured by DSC) what results from the facilitated formation of a large number small microcrystals. It was concluded that HALSs initiate two opposite tendencies - chemical protection against damage initiated by free radicals and, simultaneously, physical enhancement of sensitivity towards irradiation by the increase of nucleation density. In the studied systems, the presence of maleic anhydride does not improve compatibility between the polymeric matrix and HALSs.