Propylene Film Nucleating Agent for Capacitor Reliability
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Solution Overview
Problem
Existing biaxially oriented polypropylene (BOPP) films for capacitors have complex and costly production processes, leading to high costs and limited economic viability, while also lacking improved electrical and mechanical properties compared to prior art films.
Innovation Solution
A biaxially oriented film comprising a propylene polymer composition with 90-99.99% high isotactic homopolymer propylene, 0.0000001-1% polymeric α-nucleating agent, and optional propylene homo- or copolymer, produced through a simplified process involving specific catalysts and polymerization conditions, resulting in films with enhanced electrical and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If long-chain branched polypropylene is used to produce BOPP films with good electrical properties, then the electrical properties are improved, but the production process becomes complicated and costs increase
Solution Approach 1:
The invention changes the chemical composition parameters by incorporating specific amounts of ethylene (0.1-5 mol%) and vinyl acetate (0.1-5 mol%) copolymers along with the polymeric nucleating agent, creating a new polymer composition that achieves good electrical properties through compositional modification rather than complex processing of long-chain branched polypropylene
Solution Approach 2:
The invention creates a composite polymer material combining polypropylene with small amounts of ethylene-vinyl acetate copolymer and polymeric nucleating agent, achieving synergistic effects that improve electrical properties while maintaining simple processing characteristics
2Strength
If long-chain branched polypropylene is used to produce BOPP films with good mechanical properties, then the mechanical properties are improved, but the production process becomes complicated and costs increase
Solution Approach 1:
The invention modifies the polymer composition by adding specific copolymers and nucleating agents in controlled amounts, achieving improved mechanical properties through compositional changes rather than complex processing of branched polypropylene
Solution Approach 2:
The polymeric nucleating agent acts as an intermediary that facilitates crystal formation and improves mechanical properties without requiring the complex long-chain branching structure, serving as a simpler alternative pathway to achieve the same effect
3Shape
If an α-nucleating agent is used in polypropylene films, then surface roughness is reduced, but the film quality for capacitors deteriorates
Solution Approach 1:
The invention changes the nucleating agent parameters by using a polymeric nucleating agent with specific molecular weight and composition rather than conventional small molecule α-nucleating agents, achieving both smooth surface and good capacitor film quality simultaneously
Solution Approach 2:
The invention applies local quality modification by incorporating the polymeric nucleating agent at specific concentrations (0.001-1000 ppm) to achieve surface smoothness while maintaining bulk properties suitable for capacitor applications
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 films exhibit improved electrical and mechanical properties, are suitable for capacitors with long-term durability, and can be produced economically using a simpler process, maintaining or exceeding the performance of prior art films.
Implementation Method 1
comprising (i) from 90 to 99.99% by weight of a high isotactic homopolymer of propylene having a content of isotactic pentad fraction of from 93 to 98% and a melt flow rate MFR2 of from 0.5 to 10 g/10 min; and (ii) from 0.0000001 to 1% by weight of a polymeric α-nucleating agent
Data Source
AI summary
The present invention is biaxially oriented film comprising a layer comprising a propylene polymer composition comprising a high isotactic homopolymer of propylene and a polymeric α-nucleating agent. The composition may also comprise other propylene polymers.