Linear Low Density Polyethylene
LLDPE
9/21/2008
“Linear
low-density polyethylene (LLDPE) is a substantially linear polymer
(polyethylene), with significant numbers of short branches, commonly made by
copolymerization of ethylene with longer-chain olefins. Linear low-density
polyethylene differs structurally from conventional low-density polyethylene
because of the absence of long chain branching. The linearity of LLDPE results
from the different manufacturing processes of LLDPE and LDPE. In general, LLDPE
is produced, at lower temperatures and pressures, by copolymerization of
ethylene and such higher alpha olefins as butene, hexene, or octene. The
copolymerization process produces an LLDPE polymer that has a narrower molecular
weight distribution than conventional LDPE and in combination with the linear
structure, significantly different rheological properties.”
Wikipedia: http://en.wikipedia.org/wiki/Linear_low_density_polyethylene
(11/19/2008)
Warning: Sometimes the older links no longer work. Go to the US Patent number search page, copy the Patent number into the search box and search. For the articles, use your browser to go the Journal site.
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Notes
“The production of LLDPE is initiated by transition metal
catalysts, particularly Ziegler or Philips type of catalyst. The actual
polymerization process can be done in either solution phase or gas phase
reactors. Usually, octene is the copolymer in solution phase while butene and
hexene are copolymerized with ethylene in a gas phase reactor. The LLDPE resin
produced in a gas phase reactor is in granular form and may be sold as granules
or processed into pellets. 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.”
Wikipedia: http://en.wikipedia.org/wiki/Linear_low_density_polyethylene
(11/19/2008)
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Review Articles
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US Patents
11/18/2008
10/21/2008
7,439,290
Linear low density polyethylene compositions and films
10/7/2008
7,432,323
Polyolefin resin composition
9/2/2008
7,420,010
Polyethylene
compositions
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Journal Articles
2/27/2009
Kinetics Study of Mesophase-Crystal Transformation in Highly Oriented
Homogeneous Poly(ethylene-co-1-octene) Filament
(170 – 177)
International Journal of Polymer Analysis and Characterization 14 #2 (2009)
Thermal, dielectric, and mechanical properties of
SiC particles filled linear low-density polyethylene composites
(p 1695-1703)
Journal of Applied Polymer Science 112 #3 (2009)
Abstract
2/20/2009
Activation of hafnocene catalyzed polymerization of 1-hexene with MAO and
borate
(863-869)
European Polymer Journal 45 #3 (2009)
Copolymerization of tetradecene-1 and octene-1 with silyl-protected
10-undecen-1-ol using a Cs-symmetry hafnium metallocene catalyst. A route to
functionalized poly(
-olefins)
(p 876-886)
Journal of Polymer Science Part A: Polymer Chemistry 47 #3 (2009)
Abstract
11/21/2008
Preparation and physical properties of LLDPE
grafted with novel nonionic surfactants
(p 1268-1277)
Journal of Applied Polymer Science 111 #3 (2009)
Abstract
Effect of die design on die drool phenomenon for
metallocene based LLDPE: Theoretical and experimental investigation
(p 1728-1737)
Journal of Applied Polymer Science 111 #4 (2009)
Abstract
Copolymerization of ethylene and cyclopentene
with the Phillips CrOx/SiO2
catalyst in the presence of an aluminum alkyl cocatalyst
(p 1869-1877)
Journal of Applied Polymer Science 111 #4 (2009)
Abstract
Microwave-absorbing properties of linear
low-density polyethylene/ethylene-octene copolymer/carbonyl iron powder
composites
(p 1911-1916)
Journal of Applied Polymer Science 111 #4 (2009)
Abstract
10/24/2008
Polypropylene/linear low-density polyethylene
blends: Morphology, crystal structure, optical, and mechanical properties
(p 194-202)
Journal of Applied Polymer Science 111 #1 (2009)
Abstract
9/12/2008
Capillary Extrusion Studies of LLDPE/LDPE Blends: Effects of Manufacturing
Technology of LLDPE and Long Chain Branching
(385-394)
International Polymer Processing #4 (2008)
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Roger D. Corneliussen
Editor
Telephone: 610 883 0055
rcorneliussen@4spe.org
www.maropolymeronline.com
Copyright 2008 by Roger D. Corneliussen