Linear Low-Density Polyethylene (LLDPE)
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EXW, FOB, DAP, CPT, FCA, CFRWhat is Linear Low-Density Polyethylene (LLDPE)?
Linear low-density polyethylene (LLDPE) is a substantially linear thermoplastic polymer (of polyethylene), with significant numbers of short branches (compared to other PE grades), commonly made by copolymerization of ethylene with longer-chain olefins. Low density is the result of these short branches in LLDPE, which essentially makes this material more resilient, highly flexible and strong against tear stress. It also can easily be formed into film-like materials that retain significant tensile strength.
LLDPE Production Method
LLDPE is commonly manufactured in forms of granules and powder, consisting of different types of additives, such as anti-block agents, antioxidants, and UV stabilizers.
LLDPE is produced at lower temperatures and pressures by copolymerization of ethylene and such higher alpha-olefins such as butene, hexene, or octene comonomers.
The production of LLDPE is initiated by transition metal catalysts, particularly Ziegler or Philips types of catalyst. The actual polymerization process can be done either in solution phase or in gas phase reactors. Typically, octene is the comonomer in solution phase while butene and hexene are copolymerized with ethylene in a gas phase reactor.
LLDPE Applications
LLDPE is mostly used for:
- Film applications such as food and non-food packaging, shrink/stretch film, and non-packaging uses
- Injection molding
- Extrusion coating like coatings for cables and geomembranes
- Roto-molding
- Stretched tape
- Monofilament
- Plastic bags and sheets (where lower thickness is required compared to comparable LDPE)
- Plastic wrap, stretch wrap, pouches, toys, covers, lids, pipes, buckets and containers
LLDPE Main Properties
LLDPE’s properties, and therefore its applications, can be varied by altering the proportion of ethene and comonomer and also, by using different comonomers. The main properties gained by such alterations are as follows:
- Flexibility
- Translucency and natural milky color
- Good chemical resistance
- Good water vapor and alcohol barrier properties
- Good stress crack and impact resistance
- Excellent application for mild and strong buffers
LLDPE Advantages
- Puncture- and impact-resistant
- Favorably flexible
- Resistant to oxidation
- Good environmental stress cracking resistance
- Strong, even in film form
- UV resistant
LLDPE Disadvantages
- Unable to recover after being stretched
- Non-biodegradable
- Difficult to recycle
What is Linear Low-Density Polyethylene (LLDPE)?
Linear low-density polyethylene (LLDPE) is a substantially linear thermoplastic polymer (of polyethylene), with significant numbers of short branches (compared to other PE grades), commonly made by copolymerization of ethylene with longer-chain olefins. Low density is the result of these short branches in LLDPE, which essentially makes this material more resilient, highly flexible and strong against tear stress. It also can easily be formed into film-like materials that retain significant tensile strength.
LLDPE Production Method
LLDPE is commonly manufactured in forms of granules and powder, consisting of different types of additives, such as anti-block agents, antioxidants, and UV stabilizers.
LLDPE is produced at lower temperatures and pressures by copolymerization of ethylene and such higher alpha-olefins such as butene, hexene, or octene comonomers.
The production of LLDPE is initiated by transition metal catalysts, particularly Ziegler or Philips types of catalyst. The actual polymerization process can be done either in solution phase or in gas phase reactors. Typically, octene is the comonomer in solution phase while butene and hexene are copolymerized with ethylene in a gas phase reactor.
LLDPE Applications
LLDPE is mostly used for:
- Film applications such as food and non-food packaging, shrink/stretch film, and non-packaging uses
- Injection molding
- Extrusion coating like coatings for cables and geomembranes
- Roto-molding
- Stretched tape
- Monofilament
- Plastic bags and sheets (where lower thickness is required compared to comparable LDPE)
- Plastic wrap, stretch wrap, pouches, toys, covers, lids, pipes, buckets and containers
LLDPE Main Properties
LLDPE’s properties, and therefore its applications, can be varied by altering the proportion of ethene and comonomer and also, by using different comonomers. The main properties gained by such alterations are as follows:
- Flexibility
- Translucency and natural milky color
- Good chemical resistance
- Good water vapor and alcohol barrier properties
- Good stress crack and impact resistance
- Excellent application for mild and strong buffers
LLDPE Advantages
- Puncture- and impact-resistant
- Favorably flexible
- Resistant to oxidation
- Good environmental stress cracking resistance
- Strong, even in film form
- UV resistant
LLDPE Disadvantages
- Unable to recover after being stretched
- Non-biodegradable
- Difficult to recycle
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