Linear low density polyethylene (LLDPE) is a substantially linear polymer, with significant numbers of short branches, commonly made by copolymerization of ethylene with longer-chain olefins. Low density polyethylene (LDPE) is a thermoplastic made from oil. ... Polyethylene or polyethene is a commodity thermoplastic heavily used in consumer products (over 60M tons are produced worldwide every year). ... In chemistry, copolymerization is the process of using more than one monomer in the production of a polymer, resulting in a product with properties different to the homopolymer of either monomer. ... A synonym for the more widely accepted term, alkene. ...
LLDPE has higher tensile strength and higher impact and puncture resistance than LDPE. It is very flexible and elongates under stress. It can be used to make thinner films, with better environmental stress cracking resistance. It has good resistance to chemicals and to ultraviolet radiation. It has good electrical properties. However it is not as easy to process as LDPE, has lower gloss, and narrower range for heat sealing. The g. ... Low density polyethylene (LDPE) is a thermoplastic made from oil. ... Ultraviolet (UV) radiation is electromagnetic radiation of a wavelength shorter than that of the visible region, but longer than that of soft X-rays. ... Heat Sealer - Machine used to seal product packaging using heat. ...
It is used for plastic bags and sheets (where it allows using lower thickness than comparable LDPE), plastic wrap, toys, lids, pipes, buckets and containers, covering of cables, geomembranes, and mainly for flexible tubing. Plastic shopping bags are a common type of shopping bag in several countries. ... Plastic wrap is a thin material typically used for sealing food items in containers to keep them fresh. ...
A film comprising a LLDPE, wherein LLDPE is produced in a gas phase process utilizing a hafnium transition metal metallocene-type catalyst system; wherein the film has a ratio of MD tear to TD tear, both determined by ASTM D-1922, of ≧0.9; wherein the MD tear of the film increases with increasing MD shrinkage.
Contemplated as well is a film having a balance of physical properties, comprising an LLDPE, wherein the film has a ratio of MD tear to TD tear, as measured by ASTM D 1922, of ≧1.0, and a MD tear≧400 g/mil, and a dart drop impact, as measured by ASTM D-1709≧500 g/mil.
The LLDPE resins used in the invention are more easily extruded into film products by cast or blown film processing techniques with lower motor load, higher throughput and/or reduced head pressure as compared to EXCEED™ resins (available from ExxonMobil Chemical Co.) of comparable melt index, comonomer type and density.
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