Company patents

MITSUI CHEMICALS, INC.

MITSUI CHEMICALS, INC. demonstrates a strong, consistent focus on materials science, with Polymer Synthesis (Polycondensation) and Polymer Compositions making up 25.7% and 19.7% of its portfolio, respectively. While many core materials categories like Coating Compositions (Paints, Inks) showed rapid growth in 2025 (36.4% YoY) and Polymer Additives grew by 69.2% in 2024, it's notable that patenting activity across almost all categories, including these growth areas, has seen significant declines so far in 2026, with Polymer Additives down by 79.2% and Coating Compositions by 60.0% compared to 2025.

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.

456 US filings (since 2023) · 12 categories · 43 themes

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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93since 2023
+50.0%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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80since 2023
-33.3%YoY
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 CompositionsPolymer AdditivesPolymer Synthesis (Polymerization)Polymer Working & CompoundingCoating Compositions (Paints, Inks)
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65since 2023
-56.0%YoY
Polymers for Electronic Devices

Synthesis and formulation of polymers, such as epoxy resins, polyimides, or ionic binders, tailored for specific functions in electronic components like sealing, insulation, or energy storage.

Polymer Synthesis (Polycondensation)
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59since 2023
0.0%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.

Coating Compositions (Paints, Inks)Adhesives
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49since 2023
+58.3%YoY
Urethane/Urea Polymerization

Methods for synthesizing polyurethanes and polyureas, including non-isocyanate routes, using various monomers, catalysts, and curing agents, often for foams, coatings, or adhesives.

Polymer Synthesis (Polycondensation)
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46since 2023
+45.5%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 Synthesis (Polycondensation)Polymer Working & CompoundingPolymer AdditivesPlastics Shaping & MoldingCoating Compositions (Paints, Inks)
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38since 2023
-50.0%YoY
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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32since 2023
-12.5%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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29since 2023
+44.4%YoY
Advanced Thermoplastic Synthesis

Synthesis and modification of high-performance thermoplastic polymers, such as poly(arylene ether ketone) (PAEK) or polycarbonates, to achieve enhanced thermal stability, mechanical strength, or specific processing characteristics.

Polymer Synthesis (Polycondensation)
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27since 2023
-41.7%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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27since 2023
-53.8%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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23since 2023
-40.0%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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18since 2023
+40.0%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.

Layered Products (Laminates, Films)Polymer Compositions
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16since 2023
+16.7%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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16since 2023
-14.3%YoY
Industrial Organic Synthesis

Methods and apparatus for the efficient and selective production of organic compounds, including amines, acids, and esters, often involving catalytic or continuous processes and purification steps.

Acyclic / Carbocyclic Compounds
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15since 2023
-50.0%YoY
Catalytic Olefin Polymerization

Methods and catalyst systems, often supported (e.g., on silica or alumina), for the synthesis of polyolefins like polyethylene and polypropylene, focusing on controlling molecular weight, distribution, and polymer morphology.

Polymer Synthesis (Polymerization)
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15since 2023
-60.0%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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14since 2023
0.0%YoY
Functionalized Polysiloxanes

Synthesis and modification of polysiloxane polymers to introduce specific functional groups or structures, enhancing properties for applications like composites, coatings, biomedical uses, or powder treatment.

Polymer Synthesis (Polycondensation)
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14since 2023
-50.0%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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10since 2023
+400.0%YoY
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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9since 2023
+150.0%YoY
Functional Coatings and Surface Modifiers

Additives or compositions specifically formulated for surface application or modification to impart protective, decorative, or specialized functional properties to polymer products.

Coating Compositions (Paints, Inks)Polymer Additives
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9since 2023
0.0%YoY
Battery Electrode Coating & Slurry

Slurry compositions and coating processes for battery electrodes, including binder/active-material slurries, surface coating layers, and electrode-to-foil adhesion for cathode and anode.

Batteries & Fuel Cells
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7since 2023
+200.0%YoY
Fiber Composite Layup & Curing

Methods and tooling for forming structural components from fibrous materials impregnated with resin, involving processes like prepreg handling, resin infusion, and co-bonding during curing.

Plastics Shaping & Molding
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7since 2023
-33.3%YoY
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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6since 2023
new
Advanced Functional Textiles

Development and application of textile materials with engineered properties such as waterproofing, thermal regulation, anti-cling, structural coloration, or enhanced filtration capabilities for specific performance needs.

Layered Products (Laminates, Films)
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6since 2023
+300.0%YoY
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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5since 2023
0.0%YoY
Advanced Polymerization Processesfiltered

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
new
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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4since 2023
new
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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4since 2023
-50.0%YoY
Bio-derived Chemical Production

Methods for producing organic chemicals from biomass or through fermentation processes, often focusing on carbohydrates or fatty acid derivatives for food, health, or industrial applications.

Acyclic / Carbocyclic Compounds
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3since 2023
+100.0%YoY
Metal Additive Manufacturing Processes

Techniques for building three-dimensional metal objects layer-by-layer using metal powders, including powder bed fusion, binder jetting, and directed energy deposition. This theme encompasses process mechanics, equipment design, and operational control for AM systems.

Plastics Shaping & Molding
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3since 2023
0.0%YoY
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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3since 2023
0.0%YoY
Advanced Optical Imaging & Lens Design

Development of sophisticated optical lens assemblies and computational methods to achieve high-resolution, precise, or specialized imaging, often for medical or scientific applications.

Optical Elements & Systems
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3since 2023
n/a
Wearable Display Optics

Optical systems and components specifically designed for head-mounted displays, augmented reality (AR) glasses, and virtual reality (VR) headsets, focusing on image projection, waveguide integration, and display durability.

Optical Elements & Systems
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3since 2023
n/a
Lithium Battery Anode Materials

Active anode materials and manufacturing techniques for rechargeable lithium-ion batteries, including silicon-carbon composites, graphite, lithium-metal anodes, and electrode coating processes that improve capacity, cycle life, and rate capability.

Batteries & Fuel Cells
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3since 2023
n/a
Battery Material Recovery

Processes and apparatus for disassembling spent batteries and recovering valuable materials (e.g., metals, electrolytes, plastics) through mechanical, chemical, or electrochemical methods for reuse or sustainable disposal.

Batteries & Fuel Cells
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2since 2023
new
Thermoplastic Compression Molding

Processes involving the application of heat and pressure to shape thermoplastic or elastomeric materials, often using molds or presses, to achieve specific forms or material properties.

Plastics Shaping & Molding
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2since 2023
n/a
EV Thermal Management Systems

Systems designed to manage the temperature of multiple components in electric or hybrid vehicles, such as batteries, electric motors, power electronics, and the passenger cabin, often using shared or interconnected cooling/heating circuits.

Batteries & Fuel Cells
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2since 2023
n/a
Targeted Small Molecule Therapeutics

Design and synthesis of acyclic or carbocyclic organic compounds that selectively modulate specific biological targets or pathways for the treatment of diseases.

Acyclic / Carbocyclic Compounds
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1since 2023
new
Functional Organic Materials

Synthesis and application of organic compounds designed to impart specific functionalities in material science, such as photosensitivity or charge transport, for electronic or optical devices.

Acyclic / Carbocyclic Compounds
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1since 2023
n/a
Battery Pack Mechanical Design

Focuses on the structural integrity, housing, mounting, and physical integration of battery cells into robust and protected packs within electric vehicles, including manufacturing considerations.

Batteries & Fuel Cells
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1since 2023
n/a
Battery Management Systems

Software, algorithms, and associated hardware for monitoring, controlling, and optimizing battery performance, safety, and lifespan, including charge/discharge cycles, thermal regulation, and system integration.

Batteries & Fuel Cells
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1since 2023
n/a

Patents

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