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Linear Low density Polyethylene (LLDPE)

Linear Low density Polyethylene (LLDPE) Linear Low density Polyethylene (LLDPE)
IUPAC Name
Polyethylene
HS Code
39011010
Formula
(C2H4)n
Appearance
White Granules
Cas No.
9002-88-4
Common Names
LLDPE, poly(ethylene), Bakelite DHDA 4080, Bareco wax C 7500
Packaging
- 25kg/bag
Category
  • Plastics and Rubbers
Sub Category
  • Polymer

Brief Overview

Linear low-density polyethylene is made by the co-polymerisation of Ethylene using olefins with longer chains. This polymer is different from LDPE because it has short branches rather than long ones, processed at lower temperatures and pressures, and different molecular weight distribution and linear structure. In addition, its higher tensile strength and impact resistance (when compared to LDPE) allows it to be processed to thinner films with higher stress cracking resistance. The only disadvantage it has is its narrow heat resistance and its difficulty in processing.

 

Manufacturing Process

The manufacturing process is similar to that of LDPE using the Ziegler-Natta catalyst, but an additional raw material, 1-butene or 1-hexene is added to the feedstock. This results in the formation of small side chains of one or two carbon atoms. The structure of the polymer is linear, but the density is lower due to the presence of such short branches and gives more shear strength and flexibility.

Packaging

LLDPE is used for making thin film liners, wrapping film, stretching film, etc. 80% of the world’s productions goes to food packaging due to its high puncture resistance, thus increasing the food’s shelf life. It is also used in extrusion coating applications where it protects the object like containers, paper, etc.

 

Electrical Industry

It is used as insulating materials for cables.

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