|
Processing Ease: Technical Information
Processability is a key requirement for most converting applications using high molecular weight polymers. The PRIMACOR* copolymer family offers products with melt indices (I2 at 190° C) from 1.5 to 1.300 g/10 min. Whether you need blown film, coextrusion, or hot melts, there's a resin to suit your needs.
While melt index (I2 at 190° C) is critical, the shear thinning behavior of the polymer is also important to most extrusion-based operations. Low density polyethylene (LDPE) is widely known for its processability, which is a direct function of its shear thinning. PRIMACOR copolymers, with a backbone structure similar to LDPE, also exhibit exceptional processability.
The chart shows how similarly PRIMACOR 1321 (a 2.6 MI resin) and a 2.5 MI LDPE behave as shear rate increases. This chart also gives a comparison of PRIMACOR 1321 to an LLDPE and a metallocene LLDPE. Notice the substantially lower viscosity of PRIMACOR 1321 as shear rates exceed 100 1/s versus LLDPE and metallocene LLDPE.
The lower viscosity translates into improved throughput rates, lower extruder motor torque, and reduced melt temperatures. Such behavior also allows PRIMACOR copolymers to be processed on screws designed for LDPE resins.
|
|
|
