Ethylene-(Meth)acrylate Copolymer Composition for Reduced Fish Eyes
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Solution Overview
Problem
Existing polymers used for forming films often suffer from defects known as 'fish eyes', which are undesirable shapes resembling fish eyes, and there is a need for polymers that can reduce these defects while maintaining transparency and flowability.
Innovation Solution
An ethylene-(meth)acrylate copolymer with a decomposition onset temperature of 350°C or higher, weight-average molecular weight of 90,000 or lower, and a (meth)acrylate content of 20 to 30% by mass, combined with a composition containing the copolymer and a silicon compound on the surface of polymer particles, is used to form films with reduced fish eyes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional polymers are used for film formation, then film production can proceed, but fish eye defects are generated
Solution Approach 1:
The patent applies parameter changes by precisely controlling the decomposition onset temperature (350°C or higher), weight-average molecular weight (90,000 or lower), and (meth)acrylate content (20-30% by mass) of the ethylene-(meth)acrylate copolymer. These parameter optimizations eliminate fish eye defects while maintaining film formation capability, directly resolving the contradiction between film production and defect reduction.
2Ease of operation
If polymer molecular weight is reduced to improve flowability, then film transparency and flowability are enhanced, but film strength may be compromised
Solution Approach 1:
The patent optimizes the weight-average molecular weight parameter to 90,000 or lower, which enhances flowability and transparency during film formation. Simultaneously, the decomposition onset temperature is maintained at 350°C or higher to ensure adequate film strength and stability, resolving the contradiction between flowability and strength.
3Manufacturing precision
If (meth)acrylate content is increased to reduce fish eyes, then film quality improves, but cost and processing difficulty may increase
Solution Approach 1:
The patent specifies a (meth)acrylate content range of 20-30% by mass, which is optimized to reduce fish eye defects while maintaining ease of manufacture. This parameter range achieves the desired film quality without excessive processing difficulty or cost, balancing multiple manufacturing considerations.
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 results in films with fewer fish eyes, enhanced transparency, and improved flowability, while also reducing the adhesion of polymer particles, enabling stable and productive film production.
Implementation Method 1
a decomposition onset temperature, as measured by thermogravimetry-differential thermal analysis under the conditions under air and at a temperature-rise rate of 20.0°C/min, of 350°C or higher
Data Source
Figure 1
AI summary
An ethylene-(meth)acrylate copolymer of the present invention has a decomposition onset temperature, as measured by thermogravimetry-differential thermal analysis under the conditions under air and at a temperature-rise rate of 20.0°C/min, of 350°C or higher.