Ethylene-Based Polymer Film Slip Agent Blend for Low Friction
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Solution Overview
Problem
Conventional ethylene-based polymer films with migratory slip agents face challenges in maintaining a consistent low coefficient of friction (COF) under varying environmental conditions, such as temperature and pressure, during processing and packaging applications.
Innovation Solution
A composition comprising an ethylene-based polymer and a slip agent blend, where the blend consists of greater than 50 wt % of a first polydimethylsiloxane with a number average molecular weight from 30,000 g/mol to less than 300,000 g/mol and 1 wt % to 50 wt % of a second polydimethylsiloxane with a molecular weight from 300,000 g/mol to 2,000,000 g/mol, providing a COF of 0.01 to 0.35 without the need for migratory slip agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If migratory slip agents are used to achieve low COF, then the coefficient of friction is reduced, but the consistency of COF under varying environmental conditions deteriorates
Solution Approach 1:
The patent applies parameter changes by transitioning from migratory slip agents to a non-migratory slip agent system based on polydimethylsiloxane with specifically controlled molecular weights (Mn from 30,000 to 2,000,000 g/mol). This parameter change in the slip agent chemistry and molecular weight distribution enables consistent low COF performance across varying environmental conditions including temperature and processing parameters, resolving the contradiction between achieving low friction and maintaining consistency.
2Force
If conventional slip agents are used, then low COF is achieved, but reliability under different environmental conditions deteriorates
Solution Approach 1:
The patent employs composite materials by formulating a slip agent system comprising polydimethylsiloxane with a specific molecular weight distribution (combining lower Mn components for surface activity with higher Mn components for stability). This composite approach creates a synergistic effect where the distribution of molecular weights provides both low COF and reliable performance consistency under varying environmental conditions, processing temperatures, and pressures.
3Force
If migratory slip agents are added to achieve low COF, then friction is reduced, but processing complexity increases
Solution Approach 1:
The patent applies the taking out principle by extracting the migratory component from the slip agent system and replacing it with non-migratory polydimethylsiloxane. This elimination of migration behavior simplifies processing by removing the need to account for slip agent movement and redistribution during processing, while maintaining effective low COF performance through the controlled molecular weight polydimethylsiloxane formulation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively maintains a low COF across different environmental conditions, enhancing the processing and packaging efficiency of ethylene-based polymer films without relying on migratory slip agents, thereby improving film performance and consistency.
Implementation Method 1
a slip agent blend, the slip agent blend containing (i) from greater than 50 wt % to 99 wt % of a first polydimethylsiloxane having a number average molecular weight (Mn) from 30,000 g/mol to less than 300,000 g/mol; and (ii) from 1 wt % to less than 50 wt % of a second polydimethylsiloxane having a number average molecular weight (Mn) from 300,000 g/mol to 2,000,000 g/mol
Data Source
AI summary
The present disclosure provides a composition. The composition contains (A) an ethylene-based polymer; and (B) a slip agent blend, the slip agent blend containing (i) from greater than 50 wt % to 99 wt % of a first polydimethylsiloxane having a number average molecular weight (Mn) from 30,000 g/mol to less than 300,000 g/mol; and (ii) from 1 wt % to less than 50 wt % of a second polydimethylsiloxane having a number average molecular weight (Mn) from 300,000 g/mol to 2,000,000 g/mol, based on the total weight of the slip agent blend. The present disclosure also provides a film with a layer containing said composition.