日本のエンジニアリングプラスチック市場シェア分析、業界動向と統計、成長予測 2026-2031年

日本のエンジニアリングプラスチック市場規模は、2025年に222万トン、2026年に231万トンとなり、2026年から2031年にかけて年平均成長率（CAGR）4.19%で拡大し、2031年には284万トンに達すると予測されています。国内メーカーが低価格な輸入品と直接競合する汎用品市場から撤退する中、需要は5Gインフラ、医療用インプラント、水素電解装置向けなどの特殊グレードへとシフトしています。日本のバリューチェーンは、中部地方の自動車用プレス加工拠点から、関東地方の半導体パッケージングラインや、高付加価値医療機器を製造する都市部のクリーンルームへと移行しつつあります。中国の供給過剰の影響を受けにくく、価格決定力を維持できるフッ素樹脂、ポリイミドフィルム、PFAS（有機フッ素化合物）フリーの摺動性ポリアミドといったニッチ分野に投資が集中しています。その一方で、汎用品メーカーや射出成形業者の間での業界再編により、競争力の低い企業が淘汰され、高性能樹脂と汎用グレードとの間の価格差（スプレッド）が拡大しています。

本レポートの主なポイント

• 樹脂タイプ別では、2025年の日本におけるエンジニアリングプラスチック市場において、ポリエチレンテレフタレート（PET）が28.50%のシェアを占めました。フッ素樹脂は、予測期間（2026～2031年）において6.44%という最も高い年平均成長率（CAGR）を記録すると予測されています。
• 最終用途産業別では、2025年に包装分野が数量ベースで28.89%のシェアを占めた一方、電気・電子分野は予測期間（2026～2031年）において6.37%のCAGRで成長すると見込まれています。

Japan Engineering Plastics Market Analysis by Mordor Intelligence

The Japan Engineering Plastics Market size is projected to be 2.22 million tons in 2025, 2.31 million tons in 2026, and reach 2.84 million tons by 2031, growing at a CAGR of 4.19% from 2026 to 2031. Demand is shifting from commodity polyolefins to specialty grades that serve 5G infrastructure, medical implants, and hydrogen-electrolysis equipment as domestic producers retreat from volumes that compete head-on with low-priced imports. Japan’s value chain is migrating away from Chubu’s automotive stamping plants toward Kanto’s semiconductor packaging lines and metropolitan clean rooms that manufacture high-added-value medical devices. Investment is concentrating in fluoropolymers, polyimide films, and PFAS-free tribological polyamides because these niches are insulated from Chinese overcapacity and enjoy pricing power. Meanwhile, consolidation among commodity producers and injection molders is squeezing marginal players, creating wider spreads between high-performance resins and bulk grades.

Key Report Takeaways

• By resin type, polyethylene terephthalate (PET) held 28.50% of the Japan Engineering Plastics market share in 2025. Fluoropolymers are projected to record the fastest 6.44% CAGR during the forecast period (2026-2031).
• By end-user industry, packaging captured 28.89% of the volume share in 2025, whereas electrical and electronics is set to advance at a 6.37% CAGR during the forecast period (2026-2031).

Note: Market size and forecast figures in this report are generated using Mordor Intelligence’s proprietary estimation framework, updated with the latest available data and insights as of January 2026.

Japan Engineering Plastics Market Trends and Insights

Surge in 5G and Advanced Semiconductor Packaging

Japan’s drive for semiconductor sovereignty is redirecting more than 15,000 tons per year of high-purity fluoropolymers into plasma-etch chambers and chemical-delivery tubing[1]. AGC’s JPY 35 billion expansion at Chiba, completed in 2025, increased Ethylenetetrafluoroethylene (ETFE) and Polyvinylidene Fluoride (PVDF) capacity expressly for this demand. TOPPAN and Kyocera have ramped ultra-thin polyimide films below 10 µm for advanced IC substrates, a niche that commands three to five times the margin of automotive resins. UBE is doubling polyimide capacity by 2030 as it exits commodity nylon. These moves tilt the Japan engineering plastics market toward low-dielectric, heat-resistant polymers that Chinese competitors cannot yet mass-produce at required purity levels.

Aging-Society Demand for Medical Devices

Twenty-eight-point-six percent of Japan’s population is over 65, transforming medical devices into a structural growth pillar. The Ministry of Health, Labour and Welfare approved 47 new device classifications in 2025 that rely on ISO-10993-compliant polymers. Polyether Ether Ketone (PEEK) and polysulfone are taking share in spinal implants and dialysis membranes because they enable MRI-compatible and chemically robust solutions that metals cannot offer. Asahi Kasei is doubling PIMEL polyimide capacity by 2030 to support minimally invasive surgical tools[2]. Such clinical innovation decouples resin demand from GDP, linking growth instead to procedure adoption curves that favor high-margin biocompatible grades.

Recycling and Circular-Economy Compliance Mandates

The Plastic Resource Circulation Act now obligates 25% recycled content in packaging and durable goods by 2030, prompting the Ministry of Economy, Trade and Industry (METI) to target 1 million tons of recycled plastics annually. Sumitomo Chemical processed 11,440 tons of waste into chemically recycled polypropylene in FY 2024 and plans 200,000 tons by 2030. Recycled Polyethylene Terephthalate capacity rose 28% between 2023 and 2025 to 445,000 tons, and Toray–Teijin solvent purification pilots aim to recover near-virgin Polyamide (PA) and Polybutylene Terephthalate (PBT) for under-hood automotive parts. Integrated producers that control polymerization and recycling infrastructure are positioned to capture closed-loop premiums in the Japan engineering plastics market.

PFAS Phase-Out Enabling PA Tribological Grades

The January 2025 ban on Perfluorooctanoic acid (PFOA), Perfluorooctanesulfonic acid (PFOS), and PFHxS (Perfluorohexanesulfonic acid) accelerated substitution away from PTFE-filled compounds. Asahi Kasei’s PFAS-free PA66, launched in January 2026, achieves a 0.15 coefficient of friction against steel without fluorinated additives. Mitsui Chemicals is marketing TPX polymethylpentene as a drop-in for FEP in semiconductor wet benches. Per- and polyfluoroalkyl substances (PFAS)-free resins command 20-30% price premiums, giving early movers a head start before foreign competitors replicate the chemistries.

Automotive Output Contraction 2023-24

Monthly vehicle output fell to 587,348 units in November 2025, far below historical peaks, and Japan Auto Parts Industries Association (JAPIA) recorded 36 supplier bankruptcies in 2024. The slump hits commodity PP and ABS hardest, but it also crimps demand for PA66 intake manifolds and PC headlamp lenses. Surviving molders such as the newly formed GMS Group (created by the April 2026 Nissei Plastic-TOYO Innobex merger) now control larger shares of downstream conversion capacity, slowing diffusion of next-generation resins.

PFAS Regulatory Uncertainty for Fluoropolymers

Daikin’s JPY 35 billion Chiba PTFE investment and AGC’s JPY 15 billion Kitakyushu PVDF line assume continued exemptions for high-performance grades. Yet Europe’s proposed blanket PFAS restriction could force Japan to tighten rules by 2027. Smaller players are delaying expansions and pivoting to PFAS-free chemistries, capping fluoropolymer growth despite robust semiconductor demand.

*Our forecasts treat driver/restraint impacts as directional, not additive. The impact forecasts reflect baseline growth, mix effects, and variable interactions.

Segment Analysis

By End-User Industry: Electrification Rebalances Automotive Losses

Packaging held 28.89% of Japan Engineering Plastics market share in 2025, driven by beverage and food applications that consumed 640,000 tons of PET, PP, and PS. Electrical and Electronics is forecast to grow at a 6.37% CAGR during the forecast period (2026-2031), propelled by a 17% surge in domestic IC output as Rapidus and TSMC fabs ramp capacity. Automotive remains volume-heavy but is losing relative weight; however, each EV integrates 30-40 kg of high-performance PPS, PPA, and PEEK versus 15-20 kg in internal-combustion cars, cushioning the Japan Engineering Plastics market size for this segment.

Hospitals’ shift to single-use devices and robotic platforms is boosting medical applications of radiolucent PEEK and sterilization-resistant PSU. Building and Construction demand for PVC profiles and PC glazing is stabilizing alongside residential starts, while Industrial Machinery is pacing 3-4% annual growth as factories digitize. Aerospace, though small, benefits from NEDO-funded composite programs that favor high-temperature polyimides and carbon-fiber-reinforced thermoplastics.

By Resin Type: Fluoropolymers and Specialty PAs Outpace Commodities

Polyethylene Terephthalate (PET) accounted for 28.50% of the Japan Engineering Plastics market size in 2025 on the back of rPET adoption that lifted domestic recycled capacity to 445,000 tons. Fluoropolymers are projected to advance at a 6.44% CAGR during the forecast period (2026-2031) because AGC and Daikin have committed JPY 50 billion (USD 335 million) to PTFE, PVDF, and FEP expansions for semiconductor wet processes and hydrogen-electrolyzer membranes. Specialty PA66 from Asahi Kasei and heat-resistant PA from Kuraray are capturing share in tribological gears and EV e-axles, expanding 7-8% annually.

Polycarbonate faces Chinese overcapacity yet enjoys niche demand in heads-up displays and medical shields. POM growth has moved offshore after Daicel-Polyplastics started a Nantong line, keeping domestic production focused on ultra-pure grades for medical devices. Liquid-crystal polymer volumes are lifting as 5G antenna substrates miniaturize. PMMA, styrene copolymers, and PBT remain flat or slightly contracting except for specialty formulations that meet high-voltage EV requirements.

Geography Analysis

The Kanto region accounts for the most domestic engineering plastics consumption because of its concentration of electronics, medical, and precision-molding firms. High-purity fluoropolymers, polyimide films, and PEEK implants dominate resin flows into the region, insulating it from automotive weakness. Chubu’s automotive corridor is under pressure as vehicle production slows, but Toray’s Nagoya site is pivoting toward PPS compounds for e-axles and carbon-fiber prepregs for hydrogen tanks, helping stabilize specialty demand.

Kyushu is emerging as a semiconductor-materials cluster anchored by TSMC’s Kumamoto fabs and METI’s designation of the area as a strategic zone. AGC projects Kyushu will account for up to 20% of its fluoropolymer sales by 2028 after its FORBLUE S-series expansion comes online. Trade dynamics accentuate regional differences: Japan imports roughly 190,000 tons of commodity PA6, PC, and PBT from China and South Korea while exporting 130,000 tons of specialty fluoropolymers, PEEK, and LCP to North America and Europe.

The asymmetric pattern, importing bulk, exporting specialty, will widen as Prime Polymer consolidates domestic polyolefin capacity and reallocates capital toward offshore specialty assets. Regional governments are now competing for subsidies tied to recycling plants and hydrogen infrastructure, setting the stage for localized demand spikes in recycled PET and PVDF membranes.

Competitive Landscape

The Japan Engineering Plastics market is moderately fragmented. Technological differentiation is sharpening competitive moats. Toray’s AI-driven materials informatics platform cuts resin-development cycles in half. Compliance credentials remain barriers to entry: Japanese firms’ long track records with UL 94 flammability and ISO 10993 biocompatibility keep most Chinese producers in the commodity tier.

Recent Industry Developments

• June 2025: Teijin Limited announced that pipes molded from its biomass-derived polycarbonate (PC) resin were adopted for use in the world’s first pipe organ made from bioplastic. The transparent pipes were manufactured by Teiyo Co., Ltd., a Teijin Group company specializing in plastic molding.
• March 2025: Sumitomo Chemical Co., Ltd. announced plans to market polymethyl methacrylate (PMMA) made from chemically recycled methyl methacrylate (MMA) monomer. LG Display Co., Ltd. and Nissan Motor Co., Ltd. decided to use this recycled material in their products.

List of Companies Covered in this Report:

• AGC Inc.
• Asahi Kasei
• Daicel Corporation
• Daikin Industries Ltd.
• Idemitsu Kosan Co., Ltd.
• Kaneka Corporation
• Kuraray Co., Ltd.
• Kureha Corporation
• MCT PET Resin Co., Ltd.
• Mitsubishi Chemical Group Corporation
• Mitsui Chemicals, Inc.
• PBI Advanced Materials Co., Ltd.
• Polyplastics-Evonik Corporation
• Sumitomo Chemical Co., Ltd.
• Techno-UMG Co., Ltd.
• Teijin Limited
• TORAY INDUSTRIES INC.
• UBE Corporation

Additional Benefits:

• The market estimate (ME) sheet in Excel format
• 3 months of analyst support

Table of Contents

1 Introduction
1.1 Study Assumptions and Market Definition
1.2 Scope of the Study

2 Research Methodology

3 Executive Summary

4 Market Landscape
4.1 Market Overview
4.2 Market Drivers
4.2.1 Surge in 5G and advanced semiconductor packaging
4.2.2 Ageing-society demand for medical devices
4.2.3 Recycling and circular-economy compliance mandates
4.2.4 PFAS phase-out enabling PA tribological grades
4.2.5 Cloud-based polymer CAE boosting high-turnover SKUs
4.3 Market Restraints
4.3.1 Automotive output contraction 2023-24
4.3.2 PFAS regulatory uncertainty for fluoropolymers
4.3.3 Shrinking domestic injection-molding SME base
4.4 Value Chain Analysis
4.5 Regulatory Landscape
4.6 Porter’s Five Forces
4.6.1 Bargaining Power of Suppliers
4.6.2 Bargaining Power of Buyers
4.6.3 Threat of Substitutes
4.6.4 Competitive Rivalry
4.6.5 Threat of New Entrants
4.7 Import and Export Trends
4.7.1 Fluoropolymer Trade
4.7.2 Polyamide (PA) Trade
4.7.3 Polyethylene Terephthalate (PET) Trade
4.7.4 Polymethyl Methacrylate (PMMA) Trade
4.7.5 Polyoxymethylene (POM) Trade
4.7.6 Styrene Copolymers (ABS and SAN) Trade
4.8 Price Trends
4.8.1 Fluoropolymer
4.8.2 Polycarbonate (PC)
4.8.3 Polyethylene Terephthalate (PET)
4.8.4 Polyoxymethylene (POM)
4.8.5 Polymethyl Methacrylate (PMMA)
4.8.6 Styrene Copolymers (ABS and SAN)
4.8.7 Polyamide (PA)
4.9 Recycling Overview
4.9.1 Polyamide (PA) Recycling Trends
4.9.2 Polycarbonate (PC) Recycling Trends
4.9.3 Polyethylene Terephthalate (PET) Recycling Trends
4.9.4 Styrene Copolymers (ABS and SAN) Recycling Trends
4.10 Licensors Overview
4.11 Production Overview
4.12 End-use Sector Trends
4.12.1 Aerospace (Aerospace Component Production Revenue)
4.12.2 Automotive (Automobile Production)
4.12.3 Building and Construction (New Construction Floor Area)
4.12.4 Electrical and Electronics (Electrical and Electronics Production Revenue)
4.12.5 Packaging (Plastic Packaging Volume)

5 Market Size and Growth Forecasts (Volume)
5.1 By End-User Industry
5.1.1 Automotive
5.1.2 Electrical and Electronics
5.1.3 Building and Construction
5.1.4 Packaging
5.1.5 Industrial and Machinery
5.1.6 Aerospace
5.1.7 Other End-User Industries
5.2 By Resin Type
5.2.1 Fluoropolymers
5.2.1.1 Ethylenetetrafluoroethylene (ETFE)
5.2.1.2 Fluorinated Ethylene-propylene (FEP)
5.2.1.3 Polytetrafluoroethylene (PTFE)
5.2.1.4 Polyvinylfluoride (PVF)
5.2.1.5 Polyvinylidene Fluoride (PVDF)
5.2.1.6 Other Sub Resin Types
5.2.2 Liquid Crystal Polymer
5.2.3 Polyamide
5.2.3.1 Aramid
5.2.3.2 Polyamide (PA) 6
5.2.3.3 Polyamide (PA) 66
5.2.3.4 Polyphthalamide
5.2.4 Polybutylene Terephthalate
5.2.5 Polycarbonate
5.2.6 Polyether Ether Ketone
5.2.7 Polyethylene Terephthalate
5.2.8 Polyimide
5.2.9 Polymethyl Methacrylate
5.2.10 Polyoxymethylene
5.2.11 Styrene Copolymers (ABS and SAN)

6 Competitive Landscape
6.1 Market Concentration
6.2 Strategic Moves
6.3 Market Share(%)/Ranking Analysis
6.4 Company Profiles (includes Global Overview, Market Overview, Core Segments, Financials, Strategic Information, Products and Services, Recent Developments)
6.4.1 AGC Inc.
6.4.2 Asahi Kasei
6.4.3 Daicel Corporation
6.4.4 Daikin Industries Ltd.
6.4.5 Idemitsu Kosan Co., Ltd.
6.4.6 Kaneka Corporation
6.4.7 Kuraray Co., Ltd.
6.4.8 Kureha Corporation
6.4.9 MCT PET Resin Co., Ltd.
6.4.10 Mitsubishi Chemical Group Corporation
6.4.11 Mitsui Chemicals, Inc.
6.4.12 PBI Advanced Materials Co., Ltd.
6.4.13 Polyplastics-Evonik Corporation
6.4.14 Sumitomo Chemical Co., Ltd.
6.4.15 Techno-UMG Co., Ltd.
6.4.16 Teijin Limited
6.4.17 TORAY INDUSTRIES INC.
6.4.18 UBE Corporation

7 Market Opportunities and Future Outlook
7.1 White-Space and Unmet-Need Assessment

8 Key Strategic Questions for CEOs

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