Collation shrinkage film having excellent clarity and superior toughness
a shrinkage film and excellent technology, applied in the direction of chemistry apparatus and processes, synthetic resin layered products, transportation and packaging, etc., can solve the problems of affecting the optical properties of the film, affecting the optical properties, and increasing the high crystalline fraction conten
Inactive Publication Date: 2012-02-02
DOW GLOBAL TECH LLC
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Problems solved by technology
High crystalline fraction can be made of thick crystals that scatter light and hence an increase in the high crystalline fraction content increases the haze of the film and hurts its optical properties.
The thicker the high crystalline fraction crystals, the worse are the film optics.
Also, increasing the molecular weight of the high crystalline fraction, for improved optics, could hurt dart properties of the film.
This decrease in copolymer molecular weight will hurt the dart properties.
Decreasing the high crystalline fraction content for improving optics could therefore hurt film tear.
Very broad molecular weight distribution usually increases melt elasticity of the resin leading to surface melt fracture while very narrow molecular weight distribution can cause processing issues at the die causing surface melt fracture.
Also, increase in copolymer fraction content could be achieved at a cost of reduction in high crystalline fraction content and this could hurt film tear.
This film has good shrinkage properties; however, its clarity is very bad due to low MI of the resin.
Physical properties of the incumbent shrinkage film are also low due to inherent inferior toughness of LDPE resins.
Although blending LLDPE into the incumbent film can increase the physical properties, the clarity is still bad.
In another aspect, loading too much LLDPE into the incumbent film also negatively reduces CD shrinkage ratio.
Employing FMI easy processing LLDPE made by metallocene catalyst such as ENABLE made by EXXON MOBIL can also produce high clarity and high toughness film, however, the clarity of this film is still worse than the inventive film.
Method used
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##ventive example 1
Inventive Example 1
[0165]Inventive Example 1 is made according to the following procedures: A heterogeneously branched ethylene / α-olefin copolymer is prepared using a multi-constituent catalyst system, as described hereinabove, suitable for (co)polymerizing ethylene and one or more α-olefin comonomers, e.g. 1-octene, in two adiabatic spherical reactors, linked together in series, operating under a solution condition. The ethylene monomer, 1-octene comonomer, and hydrogen were combined with a solvent, e.g. Isopar® E, commercially available from ExxonMobil. The feed streams are purified from polar impurities such as water, carbon monoxide, sulfurous compounds, and unsaturated compounds such as acetylene and cooled to 13° C. before entering the reactor. The majority (85-90%) of the reaction occurs in the first sphere reactor that is 10-foot diameter. The mixing is achieved via circulating the polymer / catalyst / cocatalyst / solvent / ethylene / co-monomer / hydrogen solution with agitator equipp...
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Abstract
A multilayer film structure comprising at least three layers, wherein at least one layer comprises ethylene and at least one alpha-olefin is claimed, wherein the ethylene interpolymer is characterized as having an average Mv and a valley temperature between the interpolymer and high crystalline fraction, Thc, such that the average Mv for a fraction above Thc from ATREF divided by average Mv of the whole polymer from ATREF (Mhc / Mhp) is less then about 1.95 and wherein the interpolymer has a CDBI of less than 60%. The interpolymer of ethylene and at least one alpha-olefin can also be characterized as having a high density (HD) fraction and an overall density such that % HD fraction<0.0168x2−29.636x+13036 where x is the density in grams / cubic centimeter.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority from U.S. Application 61 / 165,065, filed Mar. 31, 2009, the disclosure of which is incorporated by reference for purposes of U.S. practice.BACKGROUND OF THE INVENTION[0002]High clarity, high toughness are highly demanded in collation shrinkage film application. Clarity delivers aesthetics properties, high toughness affords downgauge properties.[0003]Ethylene alpha-olefin copolymer resins or film structures comprised these resins that can make films with improved aesthetics (optical) and abuse resistance (dart) properties create value to end-users. Heterogeneous ethylene alpha-olefin copolymers have both high crystalline (thick crystals) and copolymer (thin crystals) fractions.[0004]Optical properties of a film can be defined in terms of surface gloss, haze and clarity. Haze can depend on internal haze (bulk scattering) and external haze (surface scattering). Both external haze and internal haze can be a fun...
Claims
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IPC IPC(8): B32B27/08B32B27/32
CPCB32B7/02B32B27/32C08F210/16C08L23/06C08L23/0815C08L2666/06C08L2666/02C08F210/14C08F2500/12C08F2500/03C08F2500/08C08F2500/26Y10T428/31938Y10T428/31913C08F4/6224C08F4/632C08J5/18C08L23/04C08L23/08C08F2810/20C08F2500/02C08F2410/04
InventorBAFNA, AYUSH A.DEMIRORS, MEHMETYUN, XIAO BINGWU, CHANGLEE, DANIELLEWANG, JOY GUO-HUI
OwnerDOW GLOBAL TECH LLC