Environmentally and Socially Friendly Products

The Kureha Group wishes to contribute to the development of a sustainable society by providing chemistry-based products and services as solutions to various social issues, starting with the sustainable development goals (SDGs).
Therefore, the Kureha Group has set the environment, energy, and quality of life as the three high-priority categories for the development of a sustainable society. With our accumulated technology and expertise, the human capital to utilize it, and our “if it doesn't exist, create it” spirit, we are working to solve environmental issues and create products that contribute to society.

Environment

“KF Polymer” Polyvinylidene Fluoride (PVDF)

Contributing to Mitigating Global Warming

Binders for lithium-ion batteries on electric vehicles reduce CO2 emissions

Efforts, such as the Paris Agreement, to mitigate and adapt to global warming, considered to be caused by greenhouse gases, are being made at various levels. Governments and automobile manufacturers around the globe have been announcing policies to reduce greenhouse gases from vehicle exhaust, powering the shift from gas- and diesel-powered engines to electric, eco-friendly vehicles.
Batteries are a key technology for ensuring the shift to electric vehicles. Currently, lithium-ion batteries are installed in most electric vehicles due to their light weight, high energy density, and degradation due to repeated charging and discharging is low. There is now strong demand for solutions to such issues as improving the reliability of lithium-ion batteries, increasing the mileage through high-capacity output, high-speed charging, reduction of battery cost, and availability of charging stations. Our KF polymer is widely used as a binder in EV lithium-ion batteries, which are required to have long-term reliability, as it fulfills all the various performance requirements, including high adhesion to active materials, electrical stability over a wide potential range, and high permeability of lithium ions. As a pioneer of lithium-ion battery binders, we are also promoting compatibility for all-solid-state batteries in next-generation vehicles.

  • PVDF Resin
    PVDF Resin
  • Composition of lithium-ion battery (diagram) and adhesion of active material and aggregate

“Fortron KPS” Polyphenylene Sulfide(PPS)

Contributing to Mitigating Global Warming

Reducing vehicle CO2 emissions by reducing the weight of automobiles and improving fuel efficiency

Reducing the weight of automobiles should improve fuel efficiency and contribute to the reduction of greenhouse gases. Steel, which accounts for about 70% of the total weight of automobiles, is increasingly being replaced with lightweight materials, mainly for interior and exterior components.
In the 1980s, Kureha succeeded in developing a PPS with a molecular structure (linear instead of cross-linked) that overcomes the weakest point of PPS, which was previously considered a brittle material. Our PPS is a material not only easy to mold, but also has excellent thermal stability and is resistant to elongation and impact. Compared to cross-linked PPS, our linear PPS has the properties required of a metal substitute for automobile components, such as for applications demanding strict electrical characteristics. Demand is increasing year by year, mainly for use around engines and exteriors of electrical components where heat resistance is required.

PPS Resin
PPS Resin

Quality of Life

NEW Krewrap

Reducing Food Waste

Supporting an abundant, waste-free diet

Food waste is currently estimated to be 1.3 billion tons per year globally, and 6.12 million tons in Japan (Ministry of Agriculture, Forestry and Fisheries estimate, FY2017). Food is discarded when it deteriorates and becomes inedible, and there are various causes for deterioration. However, when oxidation or dehydration is to blame, packaging that is impermeable to oxygen and water vapor can delay food deterioration.
Our “NEW Krewrap” is a household plastic wrap made from polyvinylidene chloride (PVDC). Compared to other plastic wrap materials, PVDC has a superior oxygen barrier (impermeability) which prevents food oxidation. Since it is also a strong barrier against water vapor, it keeps food fresh and prevents it from drying out. It is also microwave-friendly due to high heat-resistance, making it suitable material for food storage, thereby reducing food waste.

  • Example of Food Preservation
    Example of Food Preservation
  • Avocado turns brown when exposed to oxygen (oxidization). As you can see, the avocado paste wrapped in NEW Krewrap (left photo) is less discolored than the paste wrapped in polyethylene wrap (right photo).
    Avocado turns brown when exposed to oxygen (oxidization). As you can see, the avocado paste wrapped in NEW Krewrap (left photo) is less discolored than the paste wrapped in polyethylene wrap (right photo).

Krehalon Film

Reducing Food Waste

Fought postwar malnutrition, still fighting food waste today

Krehalon film, like NEW Krewrap, is a film made from polyvinylidene chloride (PVDC). It is primarily used for the retort packaging of sausages, such as the casings for fish sausages. Since it can be used in high-temperature and high-pressure sterilization, sausages cased in PVDC can be transported and stored for long periods at room temperature. Thus, PVDC cased sausages were a valuable protein source in post-war Japan, when there was a shortage of refrigeration equipment. Even today, sausages are used as a convenient ingredient, and their long shelf life contributes to the reduction of food waste.

Examples of Using Krehalon Film
Examples of Using Krehalon Film