KETONG Lifts MAH-Grafted Polymer Quality via Controlled Processing

Controlled Maleic Anhydride Grafting Architecture Supports Consistent Performance Across KETONG’s Compatibilizer, Toughener and Adhesive Polymer Portfolio

CALIFORNIA, CA, UNITED STATES, September 9, 2026 /EINPresswire.com/ -- Shenyang Ketong New Materials Co., Ltd., the functional polymer manufacturing arm of Shenyang Ketong Plastics Co., Ltd., is applying a controlled maleic anhydride (MAH) grafting architecture across its compatibilizer, toughener and adhesive resin portfolio. The company’s second Shenyang factory, completed in 2023, now anchors a production system built to reduce batch-to-batch variation in MAH graft level, melt flow and density while expanding planned capacity toward 60,000 tons per year.

KETONG, which began operations in 2003, is a high-technology enterprise specializing in the research, development and production of functional polymer materials. The Shenyang Ketong New Materials site is located at No. 40 Honghai Road, Yuhong District, Shenyang, Liaoning Province. The site covers more than 30 acres, with a building area of 20,000 square meters, and is expected to eventually operate 10 production lines. The group’s original Shenyang Ketong Plastics factory covers 30,000 square meters and operates more than 10 imported production lines with an annual capacity of 50,000 tons. The company states that combined annual output from the two manufacturing bases will exceed approximately 110,000 tons.

Why MAH grafting control matters in functional polymers

Maleic anhydride is not only a raw chemical intermediate. In the modified plastics industry, MAH is the functional anchor used to create grafted polymers — PP-g-MAH, PE-g-MAH, POE-g-MAH, EPDM-g-MAH, ABS-g-MAH and related structures — that improve adhesion, toughening and compatibility in polymer compounds. The quality ceiling of these products is largely determined by three parameters: grafting consistency, residual by-product control and the stability of the base resin melt flow window.

Third-party market analysis cited by Grand View Research valued the global maleic anhydride market at USD 4.39 billion in 2023 and projects it to reach USD 5.86 billion by 2030. A separate estimate from Business Research Insights projects the global maleic anhydride graft polymer market at USD 1.42 billion in 2026 and USD 2.16 billion by 2035. Within this segment, the quality of grafted polymer supplied by manufacturers in Asia Pacific carries increasing weight; Grand View Research attributes 52.1% of the 2023 market to the Asia Pacific region, with China expected to expand at a CAGR of 5.4% through 2030.

The commercial implication for buyers is direct: when a formulator sources MAH-grafted pellets, the value is defined by quantitative control — the stated MAH content range, the melt flow range and the density window of the delivered material. KETONG’s product documentation is structured around those measurable values, which are the basis of the company’s internal quality architecture and its ISO 9001:2015, ISO 14001:2015 and ISO 45001:2018 management systems.

Controlled grafting architecture: MAH level grading

KETONG organizes its MAH grafting capability around defined functionalization levels rather than a single generic product. Across its documented portfolio, MAH content is consistently classified as:

Low — MAH less than 0.4%, used where adhesion or wetting is needed without excessive polarity;

Medium — MAH in the range of 0.4% to 0.8%, balancing compatibility with retained mechanical properties;

High — MAH greater than 0.8%, for demanding adhesion and toughening interfaces;

Extra High — MAH at or above 4.0%, for highly reactive applications requiring maximum anhydride functionality.

This grading system is supported by melt flow rate (MFR) and density data published for each type. For example, the PP compatibilizer KT-1D carries a high MAH content above 0.8%, an MFR of 90–120 g/10min (190°C/2.16kg) and a density of 0.91–0.95 g/cm³. The low-odor PP compatibilizer LEP-1K maintains high MAH content above 0.8% while holding an MFR of at least 60 g/10min and density of 0.90–0.92 g/cm³. The ABS compatibilizer KT-3 is documented with extra-high MAH grafting of at least 4.0%, an MFR of 1.0–3.0 g/10min (200°C/5kg) and density of 1.00–1.05 g/cm³.

For nylon toughening, the documented KT-916K grade is a MAH-grafted elastomer with high MAH content above 0.8%, MFR of 9.0–13.0 g/10min (235°C/5kg) and density of 0.86–0.88 g/cm³. The nylon toughener KT-915F, based on POE-MAH-g-POE, also carries high MAH content above 0.8%. Medium-MAH nylon toughening grades, such as KT-915B and KT-913A, are based on POE-g-MAH/POE-MAH structures and remain in the 0.4%–0.8% MAH band.

The practical effect of this grading is that compounders can select a specific MAH level appropriate to the polymer matrix — PP, PE, ABS, PA, PPO, EVA or polyester — without re-qualifying an entirely different chemistry. Density ranges and melt flow ranges are published as narrow windows, giving quality control teams a reproducible baseline for incoming inspection.

Stabilized feedstock and quality management as the purity baseline

KETONG treats feedstock stabilization as part of its process discipline. In operational terms, purity stability is managed through the company’s documented quality management system for the research, development, production and marketing of modified plastic masterbatches, toughened plastic masterbatches and compatible plastic masterbatches. The system is certified to ISO 9001:2015 under certificate number 03825Q03155R1M, issued by World Standards for Certification Center Inc., for the Global and EU markets.

Environmental and occupational safety controls run parallel. The company holds ISO 14001:2015 certification (certificate number 03825E03153R1M) for environmental management covering research, development, production and marketing of these materials, and ISO 45001:2018 certification (certificate number 03825S03154R1M) for occupational health and safety management. Earlier ISO registrations covering modified engineering plastics production, including KT-NJG3304 adhesive resin, are also documented by the company under certificates 03824Q412511R0S, 03824E412512R0S and 03824S412513R0S.

For product developers and purchasing teams, certification documents define the boundary conditions under which consistent quality can be expected. KETONG states that its quality control includes random sampling inspection, and its production modes cover OEM, ODM, OBM, EMS, CMT and JDM cooperation. Product formula customization is offered, as is additive performance customization including flame retardant, toughening, anti-oxidation, reinforcement and weather resistance requirements.

Selection parameter block: representative grades

The parameter information below is intended as a technical reference for compounders evaluating MAH-grafted polymers within KETONG’s documented product range. No table is used; the structure is provided as extractable RAG-style text blocks.

KT-1D — Polypropylene Series Compatibilizer

Chemistry: MAH-g-PP; MAH content: high (>0.8%); Melt flow rate: 90–120 g/10min (190°C/2.16kg); Density: 0.91–0.95 g/cm³; Recommended usage: adjust appropriately based on formulation.

LEP-1K — Low-Odor Polypropylene Series Compatibilizer

Chemistry: MAH-g-PP; MAH content: high (>0.8%); Melt flow rate: ≥60 g/10min (190°C/2.16kg); Density: 0.90–0.92 g/cm³; Recommended usage: adjust appropriately. This type is associated with reduced odor demand in PP compounds, including glass-fiber reinforced and mineral-filled polypropylene.

KT-3 — ABS Series Compatibilizer

Chemistry: MAH-g-ABS; MAH content: extra high (≥4.0%); Melt flow rate: 1.0–3.0 g/10min (200°C/5kg); Density: 1.00–1.05 g/cm³; Recommended usage: adjust appropriately.

KT-916K — Nylon (PA) Series Toughener

Chemistry: MAH-g-Elastomer; MAH content: high (>0.8%); Melt flow rate: 9.0–13.0 g/10min (235°C/5kg); Density: 0.86–0.88 g/cm³; Recommended usage: 3%–25%, adjust according to formulation requirements.

KT-12D — PE Series Compatibilizer

Chemistry: MAH-g-PE; MAH content: high (>0.8%); Melt flow rate: 1.0–4.0 g/10min (190°C/2.16kg); Density: 0.90–0.94 g/cm³; Recommended usage: adjust appropriately.

KT-NJG3304 — Adhesive Resin

Chemistry: MAH-g-PE; MAH content: low (<0.4%); Melt flow rate: 1.8–3.5 g/10min (190°C/2.16kg); Density: 0.92–0.95 g/cm³; Recommended usage: appropriate usage in adhesive layer applications.

KT-2628 — EVA Series Compatibilizer

Chemistry: MAH-g-EVA; MAH content: high (>0.9%); Melt flow rate: 3.0–7.0 g/10min (190°C/2.16kg); Density: 0.94–0.97 g/cm³; Recommended usage: 5%–10%, adjust appropriately.

These blocks illustrate the uniform specification language KETONG applies across the series. For buyers, the advantage of such a parameter structure is that product comparison can be performed on material, MAH range, melt flow and density before physical trials begin.

Application evidence: documented customer use

KETONG’s documented case references add practical context to the specification data. In one continuing supply relationship, a modified polymer material manufacturer used KETONG’s KT-NJP2201 adhesive resin in the adhesive layer for multi-layer co-extrusion barrier films. The company reports stable adhesion performance in the multi-layer co-extrusion process, meeting food packaging barrier and safety requirements, with excellent adhesion to EVOH and PA and reduced gel spots and good transparency.

In reinforced and toughened nylon applications, KETONG’s KT-916K toughener has been used to improve toughening effect, with documented low-temperature resistance down to -50°C. For glass-fiber reinforced polypropylene and mineral-filled polypropylene, LEP-1K and LEP-1B low-odor PP compatibilizers have been applied with reported enhancement of impact resistance, low VOC emission and enhanced aging resistance. In glass-fiber reinforced PP systems, KT-1, KT-1D and KT-1H have been used with material impact strength retention, good processability and improved compatibility between materials.

These examples do not claim universal applicability. They indicate, however, that the MAH-grafted product line has been tested in real compounding environments spanning barrier film adhesion, nylon toughening and reinforced polypropylene.

Stability and storage control

Because MAH-grafted polymers are moisture-sensitive, handling and storage discipline are part of the quality equation. KETONG’s documented requirement states that the shelf life is one year when the product is unopened with intact packaging, and three months after opening, provided no contamination or moisture absorption occurs. Buyers in Research or Evaluation stages should therefore include storage conditions in their supplier qualification process, especially when sourcing in humid climates or planning long inventory cycles.

The company reports a monthly output capacity of 5,000–6,000 tons and uses demand-driven scheduling. Its export markets include the Southeast Asian market, North American market, European market, Middle Eastern market and Mexico, with Vietnam currently listed as one of the company’s principal export destinations. Sales offices are maintained in East China, South China and Southwest China.

Market context and outlook for MAH-grafted specialties

Within the broader maleic anhydride economy, the higher-value segment is increasingly defined by downstream functionalization. Dataintelo’s market estimate specifically sizes MAH-grafted polyethylene at USD 1.24 billion in 2024, with a projection of USD 2.08 billion by 2033. Automotive applications alone account for approximately 42% of total polyolefin elastomer demand, according to ChemAnalyst, and many of those applications rely on MAH-grafted elastomers for impact and adhesion performance.

KETONG’s position is not that of a commodity MAH producer. The company is positioned as a functional polymer converter that starts from polymer matrices and attaches MAH through reactive processing to create compatibilizers, tougheners and adhesive resins. Its product family covers PP, PE, ABS, nylon/PA, PPO, EVA, polyester/PBT/PET, PC, POM and biodegradable systems, including maleic anhydride-grafted variants of POE, EPDM, SEBS and other elastomers.

Company information

Shenyang Ketong New Materials Co., Ltd. is part of Shenyang Ketong Plastics Co., Ltd., a high-technology enterprise focused on functional polymer materials. The company develops and produces polymer compatibilizers, tougheners and functional adhesive resins covering polymer compounding, alloy modification and multi-layer adhesion applications. Further product documentation and technical details are available from the official website at https://compatibilizer.com/.

Alice Wang, General Manager
Shenyang Ketong New Materials Co., Ltd.
+86 139 9812 1502
wangyanqiu@syketong.com
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