New Catalyst Technologies Add Muscle to LLDPE Films.* For processors looking to extrude extrude /ex·trude/ (ek-strldbomacd´) 1. to force out, or to occupy a position distal to that normally occupied. 2. in dentistry, to occupy a position occlusal to that normally occupied. stronger and tougher films, two firms recently came out with hexence-copolymer LLDPEs based on new catalyst technologies. Both resin resin, any of a class of amorphous solids or semisolids. Resins are found in nature and are chiefly of vegetable origin. They are typically light yellow to dark brown in color; tasteless; odorless or faintly aromatic; translucent or transparent; brittle, fracturing families are poised to compete with octene LLDPE LLDPE Linear Low Density Polyethylene and metal-locene LLDPE (mLLDPE), as well as other "super-hexene" grades. Processability plus strength Using a "next-generation" Ziegler-Natta catalyst A Ziegler-Natta catalyst is a reagent or a mixture of reagents used in the production of polymers of 1-alkenes (α-olefins). Ziegler-Natta catalysts are typically based on titanium compounds and organometallic aluminium compounds, for example triethylaluminium, (C2 system in a Unipol gas-phase reactor Reactor (electricity) A device for introducing an inductive reactance into a circuit. Inductive reactance x is a function of the product of frequency f and inductance L; thus, x = 2πfL. , Houston-based Equistar Chemicals, LP is producing new Petrothene Select hexene LLDPE resins for blown film. They are said to produce films with better processability and tear strength than mLLDPE. They also boast higher melt strength and dart impact than competitive "superhexenes" having comparable modulus See modulo. and tear strength. With a density of 0.916 g/cc, the two initial grades have MIs of 0.7 and 1.0. Each is offered with or without slip/antiblock additives. "Fabricators are looking for Looking for In the context of general equities, this describing a buy interest in which a dealer is asked to offer stock, often involving a capital commitment. Antithesis of in touch with. thinner and thinner films that retain dart impact stregth and have improed tear strength, withouta penalty to processability," says John Hotz, Equistar v.p. of LDPE/LLDPE. Used in 0.7-mil films, Petro-thene Select has as much dart impact strength as an mLLDPE but has higher tear strength at the same modulus, higher melt strength, and better processability. Films made with these resins do not require use of a processing aid to eliminate melt fracture fracture, breaking of a bone. A simple fracture is one in which there is no contact of the broken bone with the outer air, i.e., the overlying tissues are intact. In a comminuted fracture the bone is splintered. . On the other hand, gloss is not as good as mLLDPE. The new resins are aimed at heavy-duty applications, including downgauged prime liners liners, n the liquid material applied to teeth to protect them within a cavity preparation, to seal carious tissues, or to release beneficial chemicals such as fluoride. , commercial and industrial packaging, and also consumer packaging such as retail bags. High strength, high clarity Hifor Xtreme is the latest in a string of new hexenecopolymer LLDPE film resins from Eastman Chemical Co., Kingsport, Tenn. It is made with the BP gas-phase process and proprietary catalyst technology. Films reportedly exhibit exceptional dart impact and stiffness combined with unusually low seal-initiation temperature. High clarity and high MD tear strength are also claimed. Initial customer runs have shown that the dart impact of Hifor Xtreme outperforms competitive materials even when downgauged by 25%, according to according to prep. 1. As stated or indicated by; on the authority of: according to historians. 2. In keeping with: according to instructions. 3. business market manager Ed Smith. In a 1-mil film, the resin has a dart impact of 1100 g/mil, compared with 400 g/mil for Eastman's Tenite Hifor high-strength film resins. (The latter are said to have about 25% higher dart impact than other LLDPEs used in industrial packaging.) The new material has haze as low as 7% and gloss reading of 70. It's offered in a variety of formulas for blown and cast film, with densities of 0.917 and 0.926, and MIs of 0.5-0.85. Hifor Xtreme meets FDA FDA abbr. Food and Drug Administration FDA, n.pr See Food and Drug Administration. FDA, n.pr the abbreviation for the Food and Drug Administration. regulations for food contact and cook-in bags. Other uses include heavy-duty sacks, insulation overwrap, shrink bundling, merchandise bags, cross-laminate films, agricultural films, and hygienic hy·gien·ic adj. 1. Of or relating to hygiene. 2. Tending to promote or preserve health. 3. Sanitary. films.
HIFOR XTREME HEXENE LLDPE FOR BLOWN FILM
Resin Properties SC24800-F SC24801-F SC24803-F
Density, g/cc 0.917 0.917 0.926
Melt Index,
g/10min 0.85 0.5 0.5
Vicat Point, F 212 212 235
Film Gauge, mil 1.0 1.0 1.0
Haze, % 7.0 8.0 8.0
Gloss, 45[degree] 70 65 71
Dart Impact, g 1100 1100 175
Seal Initiation, F 205 205 230
Elmendorf Tear, g
MD 500 500 350
TD 600 650 650
Tensile Break, psi
MD 8000 10,000 10,000
TD 7000 8000 7500
Tensile Yield, psi
MD DNY [a] DNY [a] 2100
TD 1400 1500 2000
Ult. Elongation, psi
MD 600 600 600
TD 800 800 800
1% Secant Mod., psi
MD 26,000 26,000 38,000
TD 30,000 30,000 45,000
(a.)Does not yield.
PETROTHENE SELECT
HEXENE LLDPE FOR BLOWN FILM
Resin Properties GA TR311 GA TR322
Density, g/cc 0.916 0.916
Melt Index, g/10min 0.7 1.0
1-Mil Film Properties
Dart Impact, g 600-1000 [a] 600-800 [a]
Tensile Break, psi
MD 8500 8500
TD 6500 6500
Ult. Elongation, %
MD 525 525
TD 720 720
1% Secant Mod., kpsi
MD 26-28.8 27-28.8
TD 29 29
Elmendorf Tear, g
MD 370 370
TD 580 580
(a.)Depending on extrusion conditions.
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