Cycloolefin Copolymer Polyethylene Blends Defect Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The processing of cycloolefin copolymers into foils often results in high defect numbers, limiting their industrial applications, despite their excellent properties such as low density, high transparency, and stiffness, while other polymers with lower defect rates lack these properties.
Innovation Solution
Incorporating polyethylene into cycloolefin copolymers through melt-compounding or mixing of PE solutions and COC solutions to form polymer blends, which reduces defect numbers during the production of foils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cycloolefin copolymers are processed on conventional extrusion plants to make foils, then the material properties (transparency, stiffness, strength) are maintained, but the defect number increases significantly
Solution Approach 1:
The patent introduces polyethylene as an intermediary component in a polymer blend system. The PE acts as a mediator that improves the processibility of COC during extrusion, reducing defects without compromising the final material properties. The blend composition (COC 90-99.9 wt%, PE 0.1-10 wt%) creates a synergistic effect where PE facilitates processing while COC maintains the desired optical and mechanical properties.
Solution Approach 2:
The patent creates a composite material system by blending COC with polyethylene. This composite approach allows combining the excellent optical and mechanical properties of COC with the superior processibility of PE, achieving a material that processes better than pure COC while maintaining COC's desirable characteristics in the final foil product.
2Reliability
If other polymers with lower defect rates are used instead of COC, then the defect number is reduced, but the excellent properties (transparency, stiffness, strength) are lost
Solution Approach 1:
The patent applies local quality by using a small, optimized amount of polyethylene (0.1-10 wt%) specifically to address the processing defect issue, while the majority component (90-99.9 wt% COC) maintains the essential optical and mechanical properties. This localized modification ensures that only the necessary property changes are made without compromising the overall material performance.
Solution Approach 2:
The patent changes the compositional parameter of the polymer system by introducing controlled amounts of PE into the COC matrix. This parameter change (blend ratio) optimizes the balance between processibility and material properties, allowing the foil to be produced with fewer defects while maintaining the required stiffness, strength, and transparency.
3Ease of manufacture
If salt and pepper mixing method is used to prepare polymer blends, then the preparation is simple, but the defect number in produced foils remains high
Solution Approach 1:
The patent applies preliminary action by pre-mixing COC and PE granules in specific ratios (90:10 to 99.9:0.1) before extrusion. This preliminary blending ensures uniform distribution of the polymers, which prevents processing defects during extrusion while maintaining preparation simplicity. The pre-defined composition ratios optimize both ease of manufacture and defect reduction.
Solution Approach 2:
The patent uses a small but significant amount of polyethylene (0.1-10 wt%) in the blend. This partial addition of PE is sufficient to dramatically improve processibility and reduce defects, without excessive amounts that would compromise the optical and mechanical properties of the final foil. The optimized dosage achieves the maximum benefit with minimal additive.
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 use of polymer blends with polyethylene significantly reduces defect numbers by at least 70%, maintaining the excellent properties of cycloolefin copolymers, making them more suitable for various industrial applications.
Implementation Method 1
melt-compounding of polyethylene and cycloolefin copolymers
Data Source
AI summary
The invention relates to selected polymer blends which can be used for production of films or sheets having reduced defects, and also to a process for preparation of the polymer blends.