Vinyl-Phenylene Ether Resin Composition for High-Frequency PCBs
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Solution Overview
Problem
Conventional resin materials used in high-frequency and high-multilayer printed wiring boards face issues with moldability, copper foil peel strength, and dielectric loss tangent, while being insufficient in flame retardancy and heat resistance after moisture absorption.
Innovation Solution
A resin composition combining a terminal vinyl compound with a bifunctional phenylene ether oligomer, naphthol aralkyl type cyanate ester resin, bisphenol A cyanate ester resin, brominated flame retardant, and inorganic filler, which maintains flame retardancy and improves moldability and peel strength without compromising heat resistance or electric characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional resins (cyanate ester resin, polyphenylene ether resin, vinyl compound) are used for high frequency applications, then dielectric loss tangent decreases, but moldability deteriorates due to large molecular weight
Solution Approach 1:
The invention uses a composite resin system combining vinyl compound (a) with cyanate ester resin (b) and (c). This composite approach allows the vinyl compound to provide low dielectric loss while the cyanate ester resins contribute to improved moldability through their specific molecular structures and reactivity, resolving the contradiction between energy loss and manufacturability.
Solution Approach 2:
The invention changes the molecular weight parameters of the resin components. By selecting vinyl compound (a) with specific molecular weight (1,000-10,000) and cyanate ester resins with controlled molecular weights, the composition achieves both low dielectric loss and improved moldability, avoiding the large molecular weight that causes poor moldability in conventional resins.
2Loss of energy
If conventional resins (cyanate ester resin, polyphenylene ether resin, vinyl compound) are used for high frequency applications, then dielectric loss tangent decreases, but copper foil adhesive strength deteriorates due to nonpolarity
Solution Approach 1:
The composite resin system combines vinyl compound (a) with cyanate ester resin (b) and (c). The cyanate ester resins introduce polar groups that enhance copper foil adhesion, while the vinyl compound maintains low dielectric loss. This composite strategy simultaneously improves adhesive strength without sacrificing energy efficiency.
Solution Approach 2:
The invention applies local quality by introducing polar cyanate ester resin components specifically to improve copper foil interface adhesion, while maintaining the bulk vinyl compound composition for low dielectric loss. This localized modification of chemical properties resolves the adhesion problem without affecting the overall low-loss characteristics.
3Manufacturing precision
If resin is made rigid and fragile to achieve certain properties, then manufacturing precision may improve, but reliability deteriorates due to crack occurrence on through hole wall surface
Solution Approach 1:
The composite resin system combines the rigidity of vinyl compound (a) with the toughness of cyanate ester resin (b) and (c). This composite structure provides sufficient rigidity for precise through hole drilling while the cyanate ester components prevent crack propagation, improving reliability without sacrificing manufacturing precision.
Solution Approach 2:
The cyanate ester resin components act as a cushioning phase that prevents crack initiation and propagation during through hole drilling. This prior cushioning effect protects against the brittleness that would otherwise cause reliability failures, while maintaining the rigidity needed for precise hole formation.
Data Source
AI summary
A vinyl-compound-based resin composition containing a terminal vinyl compound (a) of a bifunctional phenylene ether oligomer having a polyphenylene ether structure, a naphthol aralkyl cyanate ester resin (b), a bisphenol A cyanate ester resin (c), a brominated flame retardant (d) and an inorganic filler (e). The resin composition is for use in a printed wiring board for high multilayer and high frequency, and is excellent in moldability, electric characteristics, peel strength, flame resistance and heat resistance after moisture absorption. Further, a prepreg comprising the above resin composition and a glass woven fabric, a metal-foil-clad laminate obtained by disposing a metal foil on one side or both sides of a stack of at least one prepreg and laminate-molding the resultant set, and a resin sheet obtained by applying a solution of the above resin composition to a surface of a metal foil or a film.