Very low density polyethylene (VLDPE) is copolymerised by ethylene and α-olefin, α-olefin has 1-butene, 1-octene, etc., mostly produced by gas-phase or liquid-phase method.VLDPE is the abbreviation code for very low density polyethylene. Very low density polyethylene density of 0.880 ~ 0.910g/cm3, low crystallinity, good flexibility; excellent mechanical properties, impact resistance, filler, optical, penetration resistance and tear resistance are very good; non-toxic, low water absorption; heat distortion temperature is high, thermal stability is good, resistance to low temperatures; there is excellent resistance to environmental stress cracking, excellent resistance to flex cracking and cold impact resistance; Good light transmission of products. Its low temperature resistance, environmental stress cracking resistance, flexural cracking resistance and tensile strength are better than low density polyethylene.
Very low density polyethylene resin has better processing performance because of its high copolymerisation monomer content. Generally available injection, extrusion and blow moulding methods such as processing and moulding of plastic products, and sometimes can also be used in the coating method. Extruder extrusion moulding shrink film, packaging film, medical packaging film and heavy packaging film; extrusion blow-moulding film of the thinnest size of up to 5μm below; in addition, can also be used with VLDPE resin and PP resin or HDPE resin co-mingled, extrusion blow-moulding film, its tear strength and impact resistance have been greatly improved; with extrusion can also be shaped into a medical hose and wire and cable insulation protection layer.
It can be used instead of ethylene - vinyl acetate copolymer, soft polyvinyl chloride and some elastomers, film for food and pharmaceutical packaging, container lining, film, and high-density polyethylene co-extruded composite film, film, hose, profiles. It is used as a modifier for high density polyethylene and polypropylene to improve tear strength and stress cracking resistance. Co-extruded with linear low density polyethylene to produce shrink film, co-extruded with high density polyethylene to produce candy twist wrapping film, ultra-microfilm, co-extruded with polypropylene and ethylene-propylene rubber to produce automobile bumpers, and co-extruded with high-impact polystyrene to produce thermoforming sheet.
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