The Effect of Vinyl Acetate Content and Polyisobutylene Concentration on the Properties of Metallocene Polyethylene-Ethyl Vinyl Acetate Coextruded Film for Stretch and Cling Film Applications

G. M. Mcnally (1) , C. M. Small (1) , W. R. Murphy (1) , G. Garrett (1)

1 QUB - Queen's University [Belfast]

A range of EVA-mLLDPE-EVA coextruded films, with polyisobutylene (PIB) masterbatch content of 0-20% and vinyl acetate (VA) comonomer content of 6, 12, and 18%, is manufactured. The films are aged at 45 C for up to 28 days to enable tack (cling) development. The results show that film tack strength improves significantly with aging. Increased VA concentration in the surface layer also shows significant improvement in film tack strength. The film tensile strength, elongation, and tear properties in both machine direction (MD) and transverse direction (TD) are not significantly affected by increase in PIB concentration. Increased VA content shows slight improvement in MD mechanical performance of the films, although TD properties are relatively unaffected.

Mots clés: polyisobutylene; LLDPE; mLLDPE; octene; EVA; cast film; coextrusion; crystallinity; tensile properties; modulus; tear strength; peel strength; tack strength; DSC; stretch; cling

G. M. Mcnally, C. M. Small, W. R. Murphy, G. Garrett. The Effect of Vinyl Acetate Content and Polyisobutylene Concentration on the Properties of Metallocene Polyethylene-Ethyl Vinyl Acetate Coextruded Film for Stretch and Cling Film Applications. Journal of Plastic Film and Sheeting, 2005, 21 (1), pp.69-83. ⟨10.1177/8756087905053791⟩. ⟨hal-00572058⟩