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LLDPE

Linear Low-Density Polyethy-lene, abbreviated as LLDPE. Linear low density polyethylene is structurally different from conventional low density polyethylene because of the absence of long chain branching. The linearity of LLDPE depends on the different manufacturing processes of LLDPE and LDPE. LLDPE is typically formed by copolymerization of ethylene and higher a olefins such as butene, hexene or octene at lower temperatures and pressures. The LLDPE polymer produced by the copolymerization process has a narrower molecular weight distribution than the general LDPE, and has a linear structure to have different rheological properties. The melt flow characteristics of LLDPE adapt to the requirements of the new process, especially with the film extrusion process, which produces high quality LLDPE products. LLDPE is used in all traditional markets for polyethylene to enhance resistance to penetration, penetration, impact and tear resistance, making LLDPE suitable as a film. Its excellent resistance to environmental stress cracking, low temperature impact resistance and warpage resistance make LLDPE attractive for pipe, sheet extrusion and all molding applications. The latest application of LLDPE is as a mulch for the lining of waste landfills and waste ponds.

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Product Details

Characteristics                                               

1. Virgin LLDPE granules

2. Non-toxic, tasteless, odorless, white granules

3. High melt viscosity, viscosity of elasticity is small, good film-forming, film thorns

Applications                                                 

-Film grade

-Widely used for thin film products, all kinds of agricultural films, daily packing   bags, garbage bags, plastic film products, agricultural small drainage pipes etc...

 

Technical Data Sheets                                                

Test Items

Unit

Test Data

Melt Flow Rate(MFR)

g/10min

2.0±0.2

Density

g/cm3

0.918±0.002

Haze

%

≤ 14

Tensile yield strength

Mpa

≥ 8

Fall float impact strength

g

≥60

Tensile strength at break

Mpa

≥12

Elongation at break

 

%

≥500

Packaging Details                                             

25 Kg PP woven bag or as customer's requirement

20MT per 20'Feet container  

 

 

LLDPE film grade

Tests

Value

Unit

Melt Flow Rate (MFR)

2.0±0.4

g/10min

Density

920±2

Kg/cm3

Tensile Strengthat Yield

8

Mpa ≥

Tensile Strengthat Break

12

Mpa ≥

haze

15

%≤

Packing

In 25 kg PP woven bags,20MT/20’FCL


LLDPE for Master Batch Use  

Tests

Value

Unit

Melt Flow Rate (MFR)

20

g/10min

Density

0.924

g/cm3

Tensile Strength

MD12

Mpa

TD 10

Elongation at Yield

13

%

Elongation at Break

200

Dark Drop Impact

105

g

Brittle Temperature(F 50)

-70

°C

Vicat Softening Point

90

°C

Packing

In 25 kg PP woven bags,20MT/20’FCL

 

Application

LLDPE has penetrated most of the traditional markets for polyethylene, including film, molding, tubing and wire and cable. The anti-leak film is a newly developed LLDPE market mulch, a large extruded sheet used as a waste landfill and waste pool liner to prevent leakage or contaminate surrounding areas. Some of LLDPE's film markets, such as bags, trash bags, elastic wraps, industrial bushings, towel bushings, and shopping bags, all take advantage of this resin after improving strength and toughness. transparent films, such as bread bags, have always been dominated by LDPE because of its better turbidity.


However, blends of LLDPE and LDPE will improve strength, penetration resistance, and stiffness of the LDPE film without significantly affecting the transparency of the film. Injection molding and rotational molding are the two largest molding applications for LLDPE. The superior toughness and low temperature and impact strength of this resin are theoretically suitable for waste bins, toys and refrigeration appliances. In addition, LLDPE's high resistance to environmental stress cracking makes it suitable for injection molded molded lids for contact with oily foods, rotomolded waste containers, fuel tanks and chemical tanks. The market for applications in pipe and wire and cable coatings is small, where the high burst strength and environmental stress crack resistance provided by LLDPE meets the requirements. 65%-70% of LLDPE is used to make films.


Production and characteristics

Typically, octene is copolymerized with ethylene in a solution phase reactor, butene. Hexene is polymerized with ethylene in a gas phase reactor. The LLDPE resin produced in the gas phase reactor is in particulate form and can be sold as a powder or further processed into pellets. A new generation of ultra-LLDPE based on hexene and octene has been made from Mobile and Union Carbide. Companies such as Novacor and Dow Plastics are introducing. These materials have great toughness limits and have new potential in the application of automatic bag removal. Very low density PE resin (density below 0.910 g/cc.) VLDPES has flexibility and softness that LLDPE does not. The properties of the resin are generally reflected in the melt index and density. The melt index reflects the average molecular weight of the resin and is primarily controlled by the reaction temperature. The average molecular weight is independent of the molecular weight distribution (MWD). Catalyst selection affects MWD. The density is determined by the concentration of the comonomer in the polyethylene chain. The comonomer concentration controls the number of short branches (the length of which depends on the type of comonomer) to control the resin density. The higher the concentration of the comonomer, the lower the resin density. Structurally, LLDPE differs from LDPE in the number and type of branches, high pressure LDPEs have long chain branches, while linear LDPEs have only short chain branches.


Structurally, LLDPE differs from HDPE only in the number of short branches. HDPE has a small number of short branches and, therefore, a material with a higher density. The physical properties of LLDPE are controlled by its molecular weight, MWD and density. LLDPE is superior to LDPE, which ultimately depends on its use. Typically, LLDPE is used to produce more rigid products in all applications, although the density of LLDPE and LDPE is between 0.91 and 0.925 according to the ATSM standard for low density materials. LLDPE forms a higher crystalline structure because there are no long chain branches. The greater crystallinity of LLDPE results in a more rigid product. This higher degree of crystallinity also increases the melting point of LLDPE by 10 to 15 °C compared to LDPE. Higher tensile strength, penetration resistance, tear resistance and increased elongation are characteristics of LLDPE, making it particularly suitable for film making. If hexene or octene is used instead of butene as a comonomer, even the impact resistance and tear resistance can be greatly improved. For a given resin at the same melt index and density, the hexene and octene LLDPE resins are improved to 300% in impact and tear properties. The longer side chains of hexene and octene resins act like a "knot" molecule between the chains, improving the toughness of the compound. The production of resins with cyclic olefin metal derivative catalysts will have unique properties. The narrower MWD improves comonomer distribution for better film clarity, sealability and impact strength, similar to LLDPE produced with Ziegler catalysts. In terms of transparency, LLDPE has similar disadvantages as LDPE. The turbidity and gloss of the LLDPE film are not good, mainly because of its higher crystallinity, resulting in film surface roughness. The transparency of the LLDPE resin can be improved by blending with a small amount of LDPE.



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