Dispersion liquid, composite particles, and method for producing composite particles

The dispersion liquid with composite particles of tetrafluoroethylene-based polymers and silica, combined with an aromatic polymer and azeotropic liquid media, addresses stability and uniformity issues, producing dense articles with improved electrical properties for printed circuit boards.

JP7708106B2Active Publication Date: 2025-07-15AGC INC
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Patent Information

Application Number
JP2022537970
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2020-10-12
Filing Date
2021-07-16
Publication Date
2025-07-15
Estimated Expiration
2041-07-16

AI Technical Summary

Technical Problem

Existing resin compositions containing tetrafluoroethylene-based polymers and silica-coated fluororesin particles suffer from insufficient uniformity, dispersion stability, and interaction issues, leading to poor handling and restricted use modes, with silica easily detaching from the composite particles, and the molded articles exhibit surface roughness and non-uniform component distribution.

Method used

A dispersion liquid containing composite particles of tetrafluoroethylene-based polymers with silica and an aromatic polymer, dispersed in a liquid medium with specific viscosity and comprising two types of liquid dispersion media forming an azeotropic mixture, enhances dispersion stability and produces dense molded articles with improved physical properties.

Benefits of technology

The dispersion liquid achieves excellent dispersion stability, resulting in dense molded articles with low linear expansion coefficients and enhanced electrical properties, suitable for applications like printed circuit boards.

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Abstract

[Problem] To provide: a dispersion which contains composite particles of a tetrafluoroethylene-based polymer and has excellent dispersion stability; and composite particles which contain a predetermined tetrafluoroethylene-based polymer and silica, have excellent dispersion stability in a dispersion medium, and have desirable physical properties such as high polarity. [Solution] This dispersion comprises: composite particles that contain an inorganic substance and a tetrafluoroethylene-based polymer having a melting temperature of 260-320ºC; an aromatic polymer; and a liquid dispersion medium, wherein the composite particles are dispersed in the liquid dispersion medium, and the dispersion has a viscosity at 25ºC of 1,000-100,000 mPa∙s.
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Citation Information

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