With the widespread use of 5G (fifth generation mobile network), low-dielectric resins such as PPE, LCP, MPI, and PTFE are being used for various components such as Copper Clad Laminates (hereinafter referred to as CCL), which are the materials for printed circuit board.

Since low-dielectric resins generally have poor adhesiveness and wettability, there are many cases where adhesion does not occur sufficiently even when general silane coupling agents are used as adhesives or primers.

Structural Formula of PPE and LCP

Each Silane and Applicable Resin

+ = effective
Please note that this table is only a guide, and the most suitable silane coupling agent will vary depending on the compatibility of the target resin or substrate with the organic functional groups in the product.

Model of Smoothness of Cupper Foil

As shown in the figure below, not only resins but also copper foils, which are indispensable for circuit board materials, are changing to low-roughness and no-roughness materials with improved surface smoothness in order to reduce transmission loss, making it difficult to provide adhesiveness.

Model : Cross Section of Copper Foil

In this trend, our silane coupling agent has a wide lineup of unique and highly functional silane coupling agents, which are not available from other companies, and will greatly contribute to the improvement of adhesion to the above-mentioned hard-to-adhere materials.

Expected Applications

Copper clad laminates, bonding sheets, glass fibers for low-dielectric resin additives, filler surface treatment, and adhesives for hard-to-adhere materials etc.

In addition to integral blends of silane coupling agents, they can also be used for systems requiring aqueous solutions such as copper foil surface treatment and glass cloth treatment.

*Click on the light blue items in the illustration for details

Introduction to Applicable Products

Long Chain Spacer Type Silane Coupling Agent

It has higher hydrophobicity than ordinary silane coupling agent, and is expected to improve wettability and adhesion with low-dielectric resin.
We have a lineup of silanes with vinyl, epoxy, methacrylic, and amino groups.

Product List

Product name	Organic functional group	Structural formula
KBM-1083	Vinyl group
KBM-4803	Epoxy group
KBM-5803	Methacrylic group
KBM-6803	Amino group

As shown below, adhesion improvement can be expected.

Epoxy-on-glass Adhesion Test

Test method
①A 1% aqueous solution is applied to a glass substrate.
②A Cured material (epoxy resin/triethylenetetramine) is prepared and adhesive strength is tested.
*Adhesion strength is calculated against a standard of 100(untreated glass).
KBM-403: Glycidoxypropyltrimethoxysilane

Radical Polymerizable Silane Coupling Agent

Expected to be applied to various radical curing resins, PPE, etc.

Product List

Product name	Organic functional group	Structural formula
X-12-1290	Vinyl group
Allyl group content allows for radical cross-linking Improves adhesion between inorganic materials such as fillers and resins by adding to polymerizable resin compositions
KBM-1403	Styryl group
Styrene group content allows for anionic, cationic, and radical polymerization Improves adhesion between inorganic materials such as fillers and resins by adding to polymerizable resin compositions

Rubber-modified Silane Coupling Agent

Due to its high hydrophobicity, it contributes to improved wettability with low dielectric resin.

Product Introduction

Product name	Common Name	Structural formula
X-12-1267B-ES	Butadiene polymer modified silane coupling agent
Improved compatibility and adhesion of various resins Improved water resistance due to high hydrophobicity

Other grades are also available.
For more information, please use the inquiry form or contact our sales representatives.

Water-based Silane Coupling Agent

VOC-free Type Silane Coupling Agent

For use in applications where aqueous solution is required.

The alkoxysilyl groups are all in the silanol state, reducing the amount of methanol and ethanol generated by more than 99%.
The alcohol normally released when a conventional silane coupling agent undergoes hydrolysis can be minimaized.
(Ex.) When 100KG of KBE-903 is hydrolyzed, 62KG of ethanol is released. ←VOC-free is required.

Features

• The step of hydrolysis can be eliminated
• The amount of alcohol released is reduced by 99% or more.
• Nonflammable
• Lower amounts of VOCs released

Expected Applications

• Primer
• Surface treatment
• Binder
• Mixing with water paints

Product List

*Stability decreases outside this pH range.
Not specified values

Silane Materials for Filler Surface Treatment

By treating the filler with silane coupling agent, the filler and resin can be integrated.

Model of Filler Surface Treatment

Short to Long Chain Alkylsilanes

This product can be used for filler surface treatment and improving filler dispersion in low dielectric resin.
We have a wide range of long-chain alkylsilanes, which contribute to improving the dispersibility of various resin systems, including low-dielectric resins.

Product List

Classification	Chemical Name	Product name	Structural formula
Alkoxy Silane	Methyltrimethoxysilane	KBM-13
	Dimethyldimethoxysilane	KBM-22
	Phenyltrimethoxysilane	KBM-103
	Dimethoxydiphenylsilane	KBM-202SS
	Tetraethoxysilane	KBE-04
	Methyltriethoxysilane	KBE-13
	Dimethyldiethoxysilane	KBE-22
	Phenyltriethoxysilane	KBE-103
	n-Propyltrimethoxysilane	KBM-3033
	n-Propyltriethoxysilane	KBE-3033
	Hexyltrimethoxysilane	KBM-3063
	Hexyltriethoxysilane	KBE-3063
	Octyltriethoxysilane	KBE-3083
	Desiltrimethoxysilane	KBM-3103C
	1,6-Bis(trimethoxysilyl)hexane	KBM-3066
	3,3,3-Trifluoropropyltrimethoxysilane	KBM-7103
Silazane	Hexamethyldisilazane	SZ-31
Siloxane	Siloxane with hydrolyzable groups	KPN-3504	Not disclosed

Aniline-type Silane

Both filler dispersibility and reactivity with resin can be expected.

Product Introduction

Classification	Chemical Name	Product name	Structural formula
Aniline	N-phenyl-3-aminopropyltrimethoxysilane	KBM-573

Other Silane Coupling Agents for Low Dielectric Resins and Hard-to-Bond Materials

In addition to the above, we have many other grades that are not listed in the catalog or on the web.
Please feel free to contact us for further information.