Linear Low Density Polyethylene Composition for Food Storage
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Solution Overview
Problem
There is a need for polyolefin compositions with improved organoleptic properties for injection molded food storage devices that do not compromise mechanical properties.
Innovation Solution
Linear low density polyethylene compositions with specific density, molecular weight distribution, melt index, vinyl unsaturation, and zero shear viscosity ratios, along with controlled levels of α-olefin comonomers and hafnium residues, are developed for injection molding applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional polyethylene compositions are used to improve organoleptic properties, then taste and odor properties are improved, but mechanical properties are negatively impacted
Solution Approach 1:
The patent applies parameter changes by precisely controlling multiple compositional parameters including density (0.912-0.925 g/cm³), comonomer content (less than 35 wt%), molecular weight distribution (Mw/Mn of 2.5-4.5), and vinyl unsaturation (less than 0.1 vinyls per 1000 carbon atoms). This multi-parameter optimization enables improvement of organoleptic properties while maintaining mechanical integrity, resolving the contradiction between taste/odor improvement and mechanical strength preservation.
2Object-affected harmful factors
If polyethylene composition is optimized for organoleptic properties, then hexane extractables are reduced, but manufacturing complexity increases
Solution Approach 1:
The patent reduces hexane extractables by implementing specific parameter ranges for density (0.912-0.925 g/cm³), comonomer distribution, and molecular weight characteristics. While this requires precise compositional control, the use of well-established polyethylene production methods with defined parameter windows makes the manufacturing complexity manageable while achieving the goal of reduced extractables.
Solution Approach 2:
The patent applies partial action by setting comonomer content at less than 35 wt%, which is a controlled limitation rather than complete elimination. This partial control approach achieves sufficient reduction in hexane extractables and improvement in organoleptic properties without requiring complete compositional simplification, balancing performance improvement with manufacturing feasibility.
Data Source
AI summary
A linear low density polyethylene composition suitable for injection molding applications comprising less than or equal to 100 percent by weight of the units derived from ethylene, less than 35 percent by weight of units derived from one or more α-olefin comonomers, and characterized by its density, molecular weight distribution (Mw/Mn), a melt index (I2), a molecular weight distribution (Mz/Mw), vinyl unsaturation, and zero shear viscosity ratio (ZSVR). The linear low density polyethylene composition exhibits low hexane extractable levels.