Toward halogen-free flame resistant polyethylene extrusion coated paper facings

Weronika Pawelec, Teija Tirri, Melanie Aubert, Eva Haggblom, Tommi Lehikoinen, Rune Skatar, Rudolf Pfaendner, Carl-Eric Wilen

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)


Extrusion coating experiments of flame retarded low density polyethylene (LDPE) onto a standard machine finished Kraft paper have been carried out. A pilot extrusion coating line was used in order to investigate the potential of halogen-free flame retardant system based on azoalkanes such as azocyclohexane (AZO) and 4′,4-bis(cyclohexylazocyclohexyl)methane (BISAZO) for fire resistant coating applications. In comparison, experiments were performed using FlameStab®NOR116, magnesium dihydroxide (MDH) and a brominated additive Luvogard MB81/PE as reference flame retardants. The concentration of azoalkane flame retardants was varied between 0.5 and 1 wt.%. The maximum extrusion temperature was varied between 260 and 290 °C and the coating layer weight from 12.9 to 25.0 g/m2. The obtained multilayer facings containing azoalkanes exhibited significantly improved flame retardant properties, especially at the low coating weight of 12.9 g/m2. Under all of the used experimental conditions the runnability on the pilot line was flawless for azoalkane formulations. In contrast, our pre-trials using MDH/LDPE (50:50) formulations failed due to poor film quality and visible white aggregates. Moreover, the multilayer facings containing the FlameStab®NOR116, Luvogard MB81/PE or mixtures thereof, showed inferior flame retardant properties compared to azoalkane based facings.
Original languageEnglish
Pages (from-to)67-72
JournalProgress in Organic Coatings
Publication statusPublished - Jan 2015
MoE publication typeA1 Journal article-refereed


  • Azoalkane
  • Flame retardant
  • Extrusion-coating
  • Paper
  • LDPE


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