Supporting the 5G era with the low-dielectric, highly insulating, heat-resistant, and highly strong new materialsKGK Chemical Corporation


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The company's FCCL, a material made by combining liquid crystal polymer film with copper foil, is an indispensable material for 5G communications.

Product Name = "SARAS," Liquid Crystal Polymer Film, and "SARAS C Series," FCCL made by Combining SARAS with Copper Foil

Demonstrating Low Noise and Power-saving Performance - Indispensable for 5G Devices

The fifth generation mobile communication system called "5G.” The day when this next generation of communication will become mainstream is not so far off, considering the trend that many smartphone manufacturers have already launched 5G-compatible models. What is essential for supporting 5G’s overwhelmingly faster communication speed over 4G is to improve the flexible copper clad laminate (FCCL), one of the main components of flexible printed circuit boards (FPC). The reason why improvements are required is that polyimide (PI), which is used in most of the current FCCLs, has a high moisture content, which results in high transmission losses and causes noise that interferes with the proper signal transmission.

One of the promising alternatives to this PI is SARAS, a liquid crystal polymer (LCP) film developed by KGK Chemical Corporation. The features of this product include a high melting point of 280°C, low moisture absorption (low dielectric), high gas barrier properties, high insulation properties, dimensional stability, three-dimensional stability, and bendability. It demonstrates a higher degree of flexibility and strength than ordinary LCP films due to a unique forming process.

The company's proprietary FCCL "SARAS C Series," is a material made by bonding SARAS and copper foil at the molecular level via a special molding method. It achieves almost non-peeling adhesion strength without an epoxy adhesive layer, which contributes to reducing noise further.

Unique Molding Technology Yields Non-oriented, High-strength LCP

A common formation method of LCP is “melt molding,” in which heat is applied to the materials. However, LCP crystals have the property of being oriented* when heated in this way, resulting with the formed LCP exhibiting less lateral strength.To address this issue, the company employed the "solution casting method," which uses an organic solvent instead of the application of heat. With this method, the company successfully produces an LCP with no crystal orientation and high strength against forces in any direction (X, Y, and Z).

As for the bonding with copper foil, LCP is deposited on the copper foil. The company established the forming method in which the dehydration-condensation reaction is accelerated simultaneously as the solvent is volatilized in a drying furnace to combine the copper and LCP molecules. The LCP layer thickness can be controlled in the range of 3 to 100 μm (1 μm = 0.001 mm).
*The state where molecules and crystals in a substance are aligned in a certain direction.

The Foundation of Next-generation Technologies such as Autonomous Driving and Telemedicine

Today, in a world where all electronic devices link with communication systems, this new product can become the foundation of the 5G era. Specifically, it can serve as an essential material for autonomous driving, telemedicine, and advanced IoT factories. In fact, SARAS has already been used as a material for vibration damping plates for high-end speakers, and the company has been receiving many inquiries, mainly from overseas companies.

The company intends to continue improving its products, looking even further ahead to 6G. For many companies that aspire to create new value through corporate collaboration, it would not hurt to keep an eye on KGK Chemical Corporation's efforts to develop products that are always ahead of the times.

Coverage date October 14, 2020

Company Overview

KGK Chemical Corporation

The company was established in 1979. As a film converter having strength in adhesion and bonding technologies, it develops, manufactures, and sells ”multifunctional film” through its end-to-end process encompassing material design, composition, fine dispersion, deposition, special laminating, surface modification treatment, and porous treatment. The company has supplied a number of distinctly unique products to the market, such as "Molecule Gradient Layer Tape," which demonstrates strong adhesion with its special structure, and "Mayclean Gel," a highly transparent optical bonding tape.

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