小西化学工業 List of Products and Services

Microparticles can be deployed in various applications in a dispersed state, but they have a tendency to re-agglomerate due to interactions between the microparticles. Inorganic microparticles are hydrophilic, which allows them to interact strongly with the hydroxyl groups of water-soluble phenolic resins. Additionally, the electrostatic repulsion between the sulfonic acid groups of the water-soluble phenolic resins enables the dispersed microparticles to remain stable and dispersed in the aqueous solution for an extended period without re-agglomerating. *Please feel free to download detailed materials or contact us for inquiries.*

• Other polymer materials

Our water-soluble phenolic resin demonstrates high robustness due to the hydrogen bonding strength between the hydroxyl groups of DHDPS and the carbonyl and amino groups of the aromatic polyamide film, in addition to the crosslinking utilizing the methylol groups at the ends of the resol-type water-soluble phenolic resin. After chlorination of the aromatic polyamide film, surface treatment with water-soluble phenolic resin allows the resin to adhere to the film, improving the blocking rate of hardness components in water. *Please feel free to download the catalog or contact us for more information.*

• Other polymer materials

Our water-soluble phenolic resin demonstrates high adhesion even to substrates without bonding agents, such as polyester and cellulose. In addition to the hydrogen bonding strength between the hydroxyl groups of DHDPS and the carbonyl or hydroxyl groups of the substrate, the crosslinking (thermosetting) using the methylol groups at the ends of the resol-type water-soluble phenolic resin results in high durability. After surface treatment with the water-soluble phenolic resin, if substances with antibacterial properties (such as amine hydrochlorides) are supported, the strong interaction between the antibacterial agent and the water-soluble phenolic resin can impart excellent wash durability and antibacterial properties to textile products. *Please feel free to download detailed materials or contact us for inquiries.*

• Other polymer materials

We would like to introduce "cationic binder" as an application example of water-soluble phenolic resin from Kohnishi Chemical Industry Co., Ltd. We have found that water-soluble phenolic resins exhibit high adhesion even to substrates without bonding groups, such as polyester and cellulose. In addition to the hydrogen bonding strength between the hydroxyl groups of DHDPS and the carbonyl or hydroxyl groups of the substrate, the crosslinking (thermosetting) utilizing the methylol group at the end of the resol-type water-soluble phenolic resin demonstrates high robustness. 【Features】 - Optimization of the molar ratio and molecular weight of DHDPS and sulfonic compounds - High adhesion to substrates without bonding groups - High robustness *For more details, please refer to the PDF document or feel free to contact us.

• Chemicals
• others

As an example of the applications of our water-soluble phenolic resin, we would like to introduce the "Nylon Fixing Agent." Our water-soluble phenolic resin is a resol resin made from dihydroxydiphenylsulfone (DHDPS) and phenolsulfonic acid. DHDPS has an electron-withdrawing sulfonyl group at its center, which gives it a much stronger hydrogen bonding capability at both ends compared to ordinary compounds like phenol, cresol, or tannic acid, allowing it to form strong hydrogen bonds with the azo groups of acidic dyes. By utilizing the ionic bonding strength between the terminal amino groups of nylon fibers and the sulfonic acid groups of the water-soluble phenolic resin, as well as the hydrogen bonding strength between the azo groups of acidic dyes and the hydroxyl groups of the water-soluble phenolic resin, the dye is fixed onto the fibers. *For more details, please refer to the PDF document or feel free to contact us.*

• Chemicals
• others

"Polysilsesquioxane (PSQ)" is a thermosetting silicone resin synthesized from trifunctional organosilane compounds. It is a silicon-based organic-inorganic hybrid material with high heat resistance, high hardness, and transparency, and there are three types of unit structures depending on the number of siloxane bonds. Our company has developed an industrial manufacturing method that precisely controls the molecular weight of PSQ and the ratio of unit structures (T3 structure ratio) within a certain range. We design and customize the structure to meet the desired physical properties and usage conditions of our customers. 【Features】 ■ Thermosetting silicone resin synthesized from trifunctional organosilane compounds ■ Silicon-based organic-inorganic hybrid material with high heat resistance, high hardness, and transparency ■ Three types of unit structures depending on the number of siloxane bonds ■ Development of an industrial manufacturing method that precisely controls the molecular weight of PSQ and the ratio of unit structures within a certain range ■ Design and customization of structures to meet the desired physical properties and usage conditions of customers *For more details, please refer to the PDF document or feel free to contact us.

• Chemicals
• Contract manufacturing

"Polysilsesquioxane (PSQ)" is a high-performance resin composed of siloxane bonds (Si-O-Si) synthesized from tri-functional organosilane compounds. It exhibits high light transmittance in the visible light range and has the characteristic of being resistant to degradation even under prolonged light exposure conditions. 【Features】 ■ High heat resistance ■ High light resistance ■ Transparency ■ High hardness ■ Low refractive index ■ Low dielectric constant *For more details, please refer to the PDF document or feel free to contact us.

• Chemicals
• Contract manufacturing

This document is a list of development plant equipment from Konishi Chemical Industry. It includes detailed information on equipment numbers, materials, capacities (L), wing shapes, temperatures (°C), and pressures (MPa) for the new pilot plant that started operation in 2018: 4PEX (the second development plant), as well as the first development plant and the medium experiment (former development plant). Please download the catalog and take a look. [Contents] ■ 4PEX (Second Development Plant) ■ First Development Plant ■ Medium Experiment (Former Development Plant) *For more details, please refer to the PDF document or feel free to contact us.

• Chemicals
• Contract manufacturing

Our company offers a seamless product development process that integrates research and development with production technology, from the lab exploration stage to industrialization involving investment, through R&D.E (Engineering). 【Konishi Chemical Industry's Contract System】 Based on our design and development management regulations, we have introduced a development method (concurrent engineering) that optimizes the entire development process up to mass production by simultaneously advancing various tasks from the lab to industrialization. Design and Development Management Regulations ◎ Cross-organizational information sharing at each stage, including design, prototyping, and production. ◎ At each stage, discussions on regulations, hazards, environment, quality, and commercialization are conducted, with management decisions being involved in advance. ◎ Tasks are promoted in parallel without waiting for the completion of the previous stage. ◎ Insights from later stages are fed back to earlier processes to resolve issues in advance. We achieve a balance of meticulous work without omissions and high efficiency (shortening processes, reducing costs), ensuring reliable product development. We anticipate and solve challenges that our customers may face in the future. *For more details, please refer to the PDF document or feel free to contact us.

• Chemicals
• Contract manufacturing

Vanadium-based redox flow batteries (RFB) are expected to be promising as large secondary batteries due to their excellent charge-discharge cycle durability and safety. Currently, the electrolyte membrane material commonly used is perfluorocarbon sulfonic acid polymer, but its high cost is considered to hinder widespread practical application. Therefore, hydrocarbon-based materials with sulfonic acid groups introduced into aromatic polymers are being investigated. Our company has produced a dense membrane of S-PES and evaluated its performance as an electrolyte membrane for RFBs. As a result, the membrane durability was found to be as strong as that of perfluorocarbon membranes, and the crossover (proton selectivity) showed approximately five times better results compared to perfluorocarbon membranes. *For more details, please refer to the PDF document or feel free to contact us.*

• Chemicals
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A membrane was fabricated by blending polyether sulfone (PES) with S-PES, and its performance as a water treatment membrane was evaluated. To confirm the effect of sulfonation on membrane hydrophilicity, model foulants (alginate, humic acid, bovine serum albumin) were supplied to a hollow fiber membrane module. As a result, the S-PES/PES blend membrane showed a smaller reduction rate in permeability compared to the PES membrane, making it less prone to fouling. *For more details, please refer to the PDF document or feel free to contact us.*

• Chemicals
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KONISHI Chemical Industry Co., Ltd. has developed sulfonated polyether sulfone 'S-PES' by sulfonating polyether sulfone (PES). The sulfonic acid group exhibits ion exchange capacity, hydrophilicity, and other properties, imparting new functions to existing polymer compounds. A novel sulfonation method for aromatic polymers has been developed, successfully achieving a high sulfonic acid group introduction rate while preventing molecular weight reduction. (Patent No. 5824734) 【Quality Example】 ■ Appearance: Light brown powder ■ Sulfonic acid group introduction rate: 30% ■ Weight average molecular weight: 130,000 ■ Moisture: ≦3% ■ Development stage: Pilot results available *For more details, please refer to the PDF document or feel free to contact us.

• Chemicals
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Our flagship product, "4,4’-Dihydroxy diphenyl sulfone (DHDPS)," has an electron-withdrawing sulfonyl group at its center, which gives the hydroxyl groups at both ends a much stronger hydrogen bonding capability compared to ordinary compounds like phenol, cresol, and tannic acid. Focusing on the characteristics of "DHDPS," we have developed various anionic water-soluble resins by copolymerizing it with sulfonic acid compounds. We expect it to be applied in many uses as an anionic surface treatment agent with excellent adhesion to substrates. 【Product Lineup (Partial)】 ■DHDPS/Phenolsulfonic acid resin (Mass-produced) ■Phenolsulfonic acid resin-R (Lab sample) ■Phenolsulfonic acid resin-N (Lab sample) ■DHDPS resin (Lab sample) *For more details, please refer to the PDF document or feel free to contact us.

• Chemicals
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