What is mLLDPE?
Metallocene linear low density polyethylene (mLLDPE) is increasingly popular with PE resin converters as it enables the production of stronger films with improved properties and that use less material. mLLDPE is especially suited to flexible packaging – one of the fastest growing sectors of the global PE market.
What is metallocene resin?
What is metallocene? A. Metallocene is tiny particles of positively charged metal ions sandwiched between two rings of carbon atoms which have five atoms apiece. Also known as “single–site” catalysts, so named because they have one singe active site per catalyst particle, each identical from one particle to another.
What is metallocene polymerization?
The metallocene catalyst polymerization active center is generally characterized as a coordinatively unsaturated cationic center of a transition metal with which an anion derived from a cocatalyst (e.g., MAO) is loosely associated; From: Polymer Science: A Comprehensive Reference, 2012.
What is the difference between mLLDPE and LLDPE?
The key difference between LLDPE and metallocene LLDPE is that LLDPE has a low impact and puncture resistance compared to metallocene LLDPE. LLDPE is a linear low-density polyethylene. It is different from LDPE (low-density polyethylene) structurally because LLDPE has no long chain branching.
What is metallocene used for?
Polyethylene produced using a metallocene can be used as a very thin film which has excellent optical properties and sealing performance, thus making it very effective for wrapping foods. The real pluses for the metallocene catalysts are the enhanced mechanical properties of the films made out of mLLDPE.
What is Surlyn?
SURLYN™ is an ionomer thermoplastic resins and the chemical structure is an Ethylene methacrylic acid copolymer with zinc (Zn), sodium (Na), lithium (Li) or other metal ions.
Is LLDPE better than LDPE?
Conclusions. For most applications LLDPE tubing is preferred, as it is stronger than LDPE. LDPE may often be chosen where flexibility is a factor or if a more transparent tube is needed. LDPE performance is greatly improved when it is used as an inner layer with a more flexible polymer as the outer layer.
What is metallocene catalyst used for?
Metallocene catalysts are useful for the polymerization of olefins and copolymerization of ethene or propene with cyclic olefins, styrene, and polar vinyl monomers.
What is metallocene polypropylene?
Polypropylene homopolymers are thermoplastic resins produced through the polymerization of propylene. The use of metallocene catalysts in the production of these homopolymers results in resins with improved optical and processing characteristics, combined with exceptional purity.
What is Surlyn resin?
Surlyn is the brand name of an ionomer resin created by DuPont, a copolymer of ethylene and methacrylic acid used as a coating and packaging material. DuPont neutralizes the acid with NaOH, yielding the sodium salt. Crystals of ethylene-methacrylic acid ionomers exhibit dual melting behavior.
What are the properties of LLDPE resin?
LLDPE resins offer a steadfast set of physical and processing properties. High tensile strength. High impact resistance. High puncture resistance. Excellent stretch, flexibility and elongation. Consistent melt flow and low shearing. The ability to create thinner films with tougher profiles. It’s all in the science.
What is mlldpe and how is it used?
Where mLLDPE is used as a minority blend component (e.g., 30-40%) to enhance physical properties of LDPE in monolayer structures, the consensus is that a conventional LDPE-based concentrate works fine. However, the trend in the U.S. is toward using 100% mLLDPE layers in multilayer film structures.
Why are mlldpe film resins more prone to melt fracture?
Because of their narrow molecular-weight distribution and higher melt viscosity, mLLDPE film resins are more prone to melt fracture. Some new fluoroelastomer additive formulations allow offered efficiency while minimizing cost.
What is mlldpe (metallocene linear low density polyethylene)?
Metallocene linear low density polyethylene (mLLDPE) is increasingly popular with PE resin converters as it enables the production of stronger films with improved properties and that use less material. mLLDPE is especially suited to flexible packaging – one of the fastest growing sectors of the global PE market.