Cyclic Olefin Copolymer Composition for High-Frequency Circuit Substrates
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Solution Overview
Problem
Cross-linked products from cyclic olefin copolymers do not have satisfactory dielectric characteristics in high frequency bands, and there is a need for improved heat resistance and mechanical properties in circuit substrates.
Innovation Solution
A cyclic olefin copolymer composition is developed, comprising specific repeating units from olefins, cyclic non-conjugated dienes, and cyclic olefins, with a specific mass ratio and inclusion of an elastomer, which enhances dielectric characteristics and heat resistance when cross-linked.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a cyclic olefin copolymer is cross-linked to improve heat resistance and mechanical properties, then heat resistance and mechanical strength are improved, but dielectric characteristics in high frequency bands deteriorate
Solution Approach 1:
The patent uses a composite material system consisting of a cyclic olefin copolymer main chain with pendant cyclic olefin units that can cross-link. This creates a composite structure where the linear copolymer provides dielectric properties while the cross-linked pendant units provide mechanical strength and heat resistance, resolving the contradiction between these opposing requirements.
Solution Approach 2:
The invention applies local quality by having cross-linking occur only at specific pendant cyclic olefin units along the polymer chain, rather than throughout the entire structure. This localized cross-linking provides mechanical reinforcement and heat resistance at critical points while preserving the overall linear chain structure necessary for good dielectric characteristics.
2Temperature
If the cross-linking density is increased to improve heat resistance, then heat resistance is improved, but dielectric characteristics and transparency deteriorate
Solution Approach 1:
The patent applies partial action by incorporating only 0.1-10 mol% of cyclic olefin units capable of cross-linking within the copolymer structure. This limited amount provides sufficient heat resistance through cross-linking while avoiding excessive cross-linking that would deteriorate dielectric characteristics and transparency. The small proportion of cross-linkable units ensures the bulk material maintains its desired properties.
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 composition achieves excellent dielectric characteristics, heat resistance, mechanical properties, transparency, and gas barrier properties, making it suitable for high-frequency applications in circuit substrates.
Implementation Method 1
a sheet obtained by cross-linking a cyclic olefin copolymer obtained by copolymerizing a specific diene compound with an organic peroxide or the like exhibits excellent dielectric characteristics
Data Source
AI summary
The cyclic olefin copolymer composition of the present invention includes a cyclic olefin copolymer (m) including a specific amount of a specific repeating unit and a cyclic olefin copolymer (n) different from the cyclic olefin copolymer (m). The cyclic olefin copolymer (n) includes at least one type selected from a copolymer (n1) of ethylene or α-olefin and cyclic olefin (where the copolymer (n1) does not include a repeating unit derived from specific cyclic non-conjugated dienes) and a cyclic olefin ring-opening polymer (n2), and when a total amount of the cyclic olefin copolymer (m) and the cyclic olefin copolymer (n) is 100% by mass, a content of the cyclic olefin copolymer (m) is 5% by mass or more to 95% by mass or less, and a content of the cyclic olefin copolymer (n) is 5% by mass or more to 95% by mass or less.