Influence of Polymer Process Aid (PPA) and Hindered Amine Light Stabilizer (HALS) Combinations in LLDPE Blown Film Applications: 2B, 2000 Polymers, Laminations & Coatings Conference Proceedings

R.E. King III--Hindered Amine Light Stabilizers (HALS) are often used as the technology of choice to create polyolefin film products that can endure prolonged contact with the damaging effects (UV radiation) of sunlight. As such, industry segments such as heavy duty shipping sacks, silage, mulch, tunnel and greenhouse films are thriving. In these high value applications, it is important to reap the greatest benefit by maximizing the effect of the various additive chemistries, while minimizing the potential negative effects of additive interference. Since Polymer Processing Additives (PPA) are often used in the LLDPE film products that go into these type of applications, it is important to understand if the HALS/PPA additive chemistry is synergistic, neutral or negative. To date, there has been no documentation of a negative effect regarding the impact of PPA on the effectiveness of HALS This study confirms, in detail, that there is no negative interaction (by examining combinations of three different PPA and five HALS). In fact, there appears to be a boost in the performance of one of the HALS, in combination with PPA.