Company patents

Denka Company Limited

Denka Company Limited's patent strategy reveals a surprising and significant shift away from its core materials categories, with all top categories experiencing substantial year-over-year declines in 2025, such as Polymer Additives (-46.3%), Polymer Compositions (-20.8%), and Polymer Synthesis (-41.4%). While Adhesives showed a remarkable 300.0% growth in 2024, this was followed by a sharp -62.5% decline in 2025, indicating a broad-based reduction in patenting activity across its traditional strengths, with 2026 data so far showing further steep declines across the board.

Patent Trend by Technology Area

Yearly patent publications since 2023

Product themes

Product-level themes inferred from filings since 2023, with category chips showing where each theme appears. Select a theme to filter the patents below.

514 US filings (since 2023) · 12 categories · 41 themes

Polymer Composites with Functional Fillers

Polymer compositions incorporating inorganic or organic filler materials to impart specific functional properties such as thermal conductivity, flame retardancy, electrical conductivity, or enhanced mechanical strength and dimensional stability.

Polymer AdditivesPolymer Synthesis (Polymerization)Polymer CompositionsPolymer Working & Compounding
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106since 2023
-35.7%YoY
High-Performance Thermally Stable Resins

Polymer compositions engineered for enhanced heat resistance, thermal stability in molten states, or improved processability at high temperatures, often involving specific copolymers, blends, or stabilizing additives for applications in electronics or automotive.

Polymer Compositions
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57since 2023
-17.6%YoY
Thermally Conductive Additives

Materials added to polymers to modify their thermal transfer properties, typically increasing conductivity for heat dissipation in applications like electronics or battery packs.

Polymer Additives
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50since 2023
-55.0%YoY
Advanced Biomarker Detection Assays

Methods and compositions for identifying, quantifying, or characterizing specific biological molecules (e.g., nucleic acids, proteins, metabolites, antibodies) or microbial species, often for diagnostic, prognostic, or quality control applications.

Material & Chemical Analysis
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47since 2023
-26.7%YoY
Hot-Melt Adhesive Formulations

Development of adhesive compositions that are applied in a molten state and solidify upon cooling, focusing on specific polymer blends, additives, and their resulting mechanical or optical properties.

Adhesives
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37since 2023
-40.0%YoY
Sustainable Polymer Materials

Development and application of polymer compositions designed for reprocessability, recyclability, or incorporating sustainable additives, often featuring reversible bonds or bio-based components.

Polymer AdditivesPolymer Working & CompoundingPlastics Shaping & Molding
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31since 2023
-50.0%YoY
LED Epitaxial Layer Engineering

Development and optimization of the semiconductor material layers and their interfaces within an LED to control light emission properties, manage internal stress, and improve device efficiency.

LED & Optoelectronics (Legacy CPC)
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29since 2023
-93.8%YoY
Elastomer Formulations for Performance

Development of rubber and elastomer compositions, often involving specific polymer blends, additives (e.g., process oils, reinforcing agents), and cure packages, to achieve desired mechanical properties like abrasion resistance, wet grip, shear durability, or flexibility for demanding applications.

Polymer Compositions
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24since 2023
-37.5%YoY
Flexible Electronic Films & Electrodes

Thin, multi-layered films and structures specifically designed for electronic applications, including flexible substrates for devices, display panel components, and active material layers for battery electrodes.

Layered Products (Laminates, Films)
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22since 2023
-50.0%YoY
Polymer Film and Membrane Fabrication

Techniques for manufacturing thin polymer layers, sheets, or multi-layer structures, often optimized for specific properties such as flexibility, barrier function, filtration, or mechanical strength.

Polymer Working & Compounding
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21since 2023
-37.5%YoY
Biomedical Polymer Formulations

Polymer compositions tailored for medical and biological applications, including implantable devices, drug delivery systems, and diagnostic tools, emphasizing properties like biocompatibility, hydrolysis resistance, optical clarity, and specific mechanical characteristics.

Polymer Synthesis (Polymerization)Polymer Compositions
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19since 2023
-40.0%YoY
Silicon-based Functional Materials

Synthesis and processing of silicon and silicon carbide materials in various forms (e.g., particles, nanowires, films) for applications beyond traditional semiconductors, such as battery components, refractories, or advanced electronics.

Non-metallic Inorganic Compounds
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19since 2023
-42.9%YoY
Lithium Compound Synthesis for Batteries

Methods for synthesizing high-purity lithium compounds, such as lithium carbonate, lithium sulfide, or composite salts, specifically optimized for use in battery electrodes or electrolytes.

Non-metallic Inorganic Compounds
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19since 2023
-75.0%YoY
Advanced Curing Chemistries

Novel formulations and mechanisms for initiating or controlling the polymerization and cross-linking of adhesives, including dual-curing systems, radical polymerization, and partial curing for tailored material properties.

Adhesives
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19since 2023
-75.0%YoY
Ceramic Matrix Composite Manufacturing

Methods and processes for fabricating ceramic matrix composites (CMCs), including preform creation, infiltration techniques, and densification to form complex shapes with enhanced properties.

Cement & Ceramics
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19since 2023
-85.7%YoY
OLED Emitter Materials

Development and optimization of organic chemical compounds and their structures, including guest-host systems and metal complexes, used within the emission layer to achieve specific light emission characteristics such as color, efficiency, and operational lifetime.

Functional Materials (LCD, Lubricants)
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18since 2023
+20.0%YoY
Dynamic & Reversible Polymer Networks

Polymers incorporating reversible bonds or crosslinks that enable reprocessing, self-healing, or tunable mechanical properties, often responding to stimuli like heat, light, or pH for de-crosslinking and re-crosslinking.

Polymer Synthesis (Polymerization)
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14since 2023
-75.0%YoY
Multi-material Product Integration & Finishing

Techniques for combining multiple materials or layers, often with specialized surface treatments, coatings, or assembly methods, to create functional or aesthetically enhanced plastic articles, including consumer goods and encapsulated electronics.

Plastics Shaping & Molding
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14since 2023
-77.8%YoY
Advanced Functional Ceramics

Ceramic materials and components engineered for specific functional applications, such as electronics, energy storage, wear resistance, or high-temperature heating elements.

Cement & Ceramics
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12since 2023
-80.0%YoY
High-Barrier Packaging Films

Multi-layer polymer films engineered to provide superior barrier properties against gases (e.g., oxygen), moisture, or aromas, often incorporating heat-sealing or resealing mechanisms for food and product preservation.

Polymer CompositionsLayered Products (Laminates, Films)
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11since 2023
-66.7%YoY
Battery Electrode Binders

Adhesive compositions specifically formulated to bind active materials within battery electrodes, emphasizing properties like electrolyte resistance, adhesion to current collectors, and processability for manufacturing.

Adhesives
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9since 2023
-33.3%YoY
Adhesion and Curing Modifiers

Substances incorporated into polymer systems to control or enhance adhesive properties, cross-linking reactions, or processing characteristics such as mold release and flow.

Polymer Additives
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8since 2023
0.0%YoY
Liquid Crystal Compositions

Mixtures of liquid crystal compounds and other additives, such as monomers or carbon black, designed to achieve specific optical, electrical, or physical properties for use in liquid crystal displays (LCDs) or other electro-optical devices.

Functional Materials (LCD, Lubricants)
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8since 2023
-83.3%YoY
Micro-LED Array Fabricationfiltered

Methods and structures for mass-producing and assembling arrays of micro-LEDs onto a substrate, including transfer processes, bonding techniques, and defect management.

LED & Optoelectronics (Legacy CPC)
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8since 2023
n/a
Sustainable & Reversible Adhesives

Adhesive technologies focused on environmental benefits such as biodegradability, natural origin, or designed for easy debonding and re-bonding to facilitate recycling, reuse, or specific application needs.

Adhesives
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8since 2023
n/a
Additive Manufacturing of Cementitious Materials

Methods for layer-by-layer deposition or 3D printing of concrete and cement-based materials, often employing rapidly hydrating binders or specialized compositions for rapid setting.

Cement & Ceramics
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6since 2023
new
Specialty Solvents and Coolants

Formulated liquid compositions designed for specific industrial applications, such as non-flammable cleaning, thermal management in electronics, or as low-viscosity, high-flash-point base fluids.

Functional Materials (LCD, Lubricants)
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6since 2023
new
Deep Ultraviolet LED Technology

Specialized design and fabrication of light-emitting diodes specifically engineered to produce light in the deep ultraviolet (DUV) spectrum, often for applications like sterilization or curing.

LED & Optoelectronics (Legacy CPC)
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6since 2023
-50.0%YoY
Reinforced & Specialty Concrete

Concrete compositions and structures enhanced with reinforcing elements or functional additives to achieve improved mechanical properties, durability, or specific functionalities beyond basic structural support.

Cement & Ceramics
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5since 2023
+200.0%YoY
Sustainable Cementitious Materials

Development of concrete and cement compositions utilizing waste products, alternative binders, or eco-friendly additives to reduce environmental impact and resource consumption.

Cement & Ceramics
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5since 2023
new
Antibody Engineering & Therapeutics

Design and modification of antibodies or antibody-derived fragments for targeted therapeutic intervention, including bispecific formats, Fc region modifications, and activatable constructs.

Material & Chemical Analysis
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5since 2023
new
CMP Slurry Formulations

Abrasive slurry compositions used in semiconductor manufacturing for planarizing wafer surfaces, typically containing abrasive particles and chemical additives to achieve specific material removal rates and selectivity.

Functional Materials (LCD, Lubricants)
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5since 2023
n/a
Advanced Polymerization Processes

Novel methods and reactor designs for polymer synthesis, focusing on improving efficiency, achieving continuous production, or controlling specific polymer architectures and product morphologies like particle size or sheet formation.

Polymer Synthesis (Polymerization)
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4since 2023
n/a
Light-Releasable Adhesives

Adhesive systems designed to lose their adhesive properties or debond upon exposure to specific wavelengths of light, often utilized for temporary bonding in sensitive manufacturing processes like semiconductor fabrication.

Adhesives
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4since 2023
n/a
Adhesion Promoters & Surface Tolerance

Chemical additives or surface treatment methods aimed at improving the bonding strength of adhesives to various substrates, including those with challenging surface chemistries or contaminants.

Adhesives
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3since 2023
n/a
Photopolymerization for Device Fabrication

Light-initiated polymerization processes used to create structures, coatings, or components, particularly for electronic devices, displays, or additive manufacturing, often involving photoinitiators and specific monomer/oligomer compositions.

Polymer Synthesis (Polymerization)
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2since 2023
n/a
Optically Clear Adhesives

Adhesive formulations designed for high transparency and minimal light distortion, primarily used in optical components, display devices, and protective films where visual clarity is paramount.

Adhesives
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1since 2023
new
Wellbore Treatment Fluids

Specialized fluid compositions, including additives and inhibitors, used in oil and gas exploration and production for purposes like drilling, fracturing, cementing, corrosion inhibition, and formation stimulation.

Functional Materials (LCD, Lubricants)
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1since 2023
n/a
Advanced Glazing & Optical Laminates

Layered glass or film structures designed to optimize optical (e.g., light transmission, reflection, diffusion) and/or thermal (e.g., insulation, heat reflection/absorption) performance in windows, displays, and lighting applications.

Layered Products (Laminates, Films)
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1since 2023
n/a
Fiber-Reinforced Structural Composites

Multi-layered materials incorporating fiber layers (e.g., carbon, non-carbon, fabric, mesh) within a polymer or ceramic matrix to achieve enhanced mechanical properties such as strength, stiffness, impact resistance, or tailored hardness for demanding structural applications.

Layered Products (Laminates, Films)
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1since 2023
n/a
High-Temperature Ceramic Coatings

Protective layers applied to ceramic or composite substrates to enhance resistance against extreme temperatures, corrosion, or erosion in harsh operating environments.

Cement & Ceramics
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1since 2023
n/a

Patents

Showing 1-10 of 15

Micro-LED Array Fabrication
Page 1 of 2
US 20230104278 A1APPLICATION
H01L33/50

PHOSPHOR PARTICLE, COMPOSITE, LIGHT- EMITTING DEVICE, AND SELF-LIGHT-EMITTING DISPLAY

Filed:2021-03-15Pub:2023-04-06
Applicant:DENKA COMPANY LIMITED

A phosphor particle for a micro LED or a mini LED, consisting of CASN and/or SCASN. A cured sheet produced by the following sheet producing procedure using this phosphor particle satisfies the following optical characteristics. <Sheet Producing Procedure> (1) 40 parts by mass of the phosphor particle and 60 parts by mass of a silicone resin OE-6630 manufactured by Dow Corning Toray Co., Ltd. are subjected to a stirring treatment and a defoaming treatment using a rotation and revolution mixer to obtain a uniform mixture. (2) The mixture obtained in the section (1) is added dropwise to a first transparent fluororesin film, and a second transparent fluororesin film is further laminated on the dropped material to obtain a sheet-like material. This sheet-like material is molded into an uncured sheet using a roller having a gap in which 50 μm is added to a total thickness of the first fluororesin film and the second fluororesin film. (3) The uncured sheet obtained in the section (2) is heated under conditions of 150° C. and 60 minutes. Then, the first fluororesin film and the second fluororesin film are peeled off to obtain a cured sheet having a film thickness of 50±5 μm. <Optical Characteristics> When an intensity at a peak wavelength of blue light emitted from a blue LED having a peak wavelength in a range of 450 nm to 460 nm is defined as Ii [W/nm], and in a case where the blue light is emitted to one surface side of the cured sheet, when an intensity of light emitted from another surface side of the cured sheet at a peak wavelength in a range of 450 nm to 460 nm is defined as It [W/nm] and an intensity thereof at a peak wavelength in a range of 600 nm to 650 nm is defined as Ip [W/nm], It/Ii is equal to or less than 0.2 and Ip/Ii is equal to or more than 0.05.