Resin and Molecular Weight Distribution Effects on Extrusion Coating of Polypropylene, 1999 Polymers, Laminations & Coatings Conference Proceedings
Ananda M. Chatterjee--Key polymer parameters for optimum extrusion coating of polypropylene (PP) have been investigated. The effect of PP resin type and molecular weight distribution (MWD) on extrusion coating performance has been determined.
Results will aide the resin selection process for extrusion coating. PP homopolymer, ethylene random and impact copolymers, each with relatively narrow and broad MWD, were extrusion coated onto PP woven fabric substrate using commercial scale equipment. The effects of resin type and molecular weight distribution on adhesion to substrate, neck-in, edge weaving and surging were investigated. A highly cracked impact copolymer of narrow MWD emerged as the preferred resin in this study. This resin technology allows the processor to avoid the practice of mixing PP homopolymer with other resins (e.g. LDPE) for extrusion coating.
Resin and Molecular Weight Distribution Effects on Extrusion Coating of Polypropylene, 1999 Polymers
