Five Companies Successfully Collaborate to Manufacture Recycled Plastic from Used Plastics and Apply It to Construction Materials
Idemitsu Kosan, Takenaka Corporation, and three other companies have successfully converted post-consumer plastics into recycled plastics using chemical recycling and the mass balance approach, applying them to construction materials.
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- 📰 Published: April 10, 2026 at 20:23
- 🔍 Collected: April 11, 2026 at 00:25 (4h 2m after Published)
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Idemitsu Kosan Co., Ltd. (hereinafter "Idemitsu Kosan"), Takenaka Corporation (hereinafter "Takenaka Corporation"), Chemical Recycle Japan Co., Ltd. (an Idemitsu Kosan subsidiary, hereinafter "CRJ"), Fukuvi Chemical Industry Co., Ltd. (hereinafter "Fukuvi Chemical"), and Prime Polymer Co., Ltd. (an Idemitsu Kosan affiliate, hereinafter "PRM")—a group of five companies—have successfully manufactured recycled plastic using discarded and collected used plastics (post-consumer plastics *1) as raw materials through the mass balance approach *2, and applied it to construction materials.
In this initiative, CRJ produced CR oil *4 from used plastics (post-consumer plastics) using its proprietary chemical recycling technology *3. Using this CR oil as a raw material, Idemitsu Kosan applied the mass balance approach to manufacture chemical recycled products. From these chemical recycled products, PRM manufactured recycled plastic. This recycled plastic is a Post-Consumer Recycled (PCR) plastic *5 that possesses quality equivalent to that of fossil fuel-derived plastics.
Fukuvi Chemical successfully applied this recycled plastic to the support leg parts of the dry soundproofing double floor *6 "Free Floor CP Series," overcoming technical challenges for its introduction as a construction material.
Takenaka Corporation aims to realize the "Circular Design Build® *7," a circular economy in the construction sector, by utilizing the construction materials derived from the recycled plastic manufactured by Fukuvi Chemical.
The five companies have been jointly promoting the establishment of a resource circulation scheme and the utilization of recycled plastic, aiming for a resource-circulating society. Leveraging the knowledge and track record gained through this initiative, they will strive to further promote the recycling of used plastics generated at construction sites and resource circulation.
*1 Post-Consumer Plastic: Plastic that has been used by end-users, such as consumers or businesses, rather than scrap generated during the manufacturing process.
*2 Mass Balance Approach: A method where, in the processing and distribution process from raw materials to products, when a raw material with a certain characteristic (e.g., derived from used plastic) is mixed with a raw material that does not have it (e.g., derived from petroleum), that characteristic is allocated to a portion of the product according to the input amount of the raw material with that characteristic.
*3 Chemical Recycling into Oil: A recycling method that converts used plastics into oil and manufactures "chemical recycled products" using the produced CR oil as a raw material.
*4 CR Oil: Chemical Recycled oil. Oil equivalent to light crude oil produced by converting used plastics into oil.
*5 Post-Consumer Recycled (PCR) Plastic: Plastic products that are recycled and regenerated from plastic used by consumers (post-consumer materials), rather than scrap generated during manufacturing.
*6 Dry Soundproofing Double Floor: A double floor system with enhanced soundproofing performance, constructed by floating floor panels with support legs.
*7 Circular Design Build®: A construction method advocated by Takenaka Corporation that eliminates waste by incorporating the concept of a circular economy with the keywords "make, use, connect," moving away from the conventional scrap-and-build approach.
In this initiative, CRJ produced CR oil *4 from used plastics (post-consumer plastics) using its proprietary chemical recycling technology *3. Using this CR oil as a raw material, Idemitsu Kosan applied the mass balance approach to manufacture chemical recycled products. From these chemical recycled products, PRM manufactured recycled plastic. This recycled plastic is a Post-Consumer Recycled (PCR) plastic *5 that possesses quality equivalent to that of fossil fuel-derived plastics.
Fukuvi Chemical successfully applied this recycled plastic to the support leg parts of the dry soundproofing double floor *6 "Free Floor CP Series," overcoming technical challenges for its introduction as a construction material.
Takenaka Corporation aims to realize the "Circular Design Build® *7," a circular economy in the construction sector, by utilizing the construction materials derived from the recycled plastic manufactured by Fukuvi Chemical.
The five companies have been jointly promoting the establishment of a resource circulation scheme and the utilization of recycled plastic, aiming for a resource-circulating society. Leveraging the knowledge and track record gained through this initiative, they will strive to further promote the recycling of used plastics generated at construction sites and resource circulation.
*1 Post-Consumer Plastic: Plastic that has been used by end-users, such as consumers or businesses, rather than scrap generated during the manufacturing process.
*2 Mass Balance Approach: A method where, in the processing and distribution process from raw materials to products, when a raw material with a certain characteristic (e.g., derived from used plastic) is mixed with a raw material that does not have it (e.g., derived from petroleum), that characteristic is allocated to a portion of the product according to the input amount of the raw material with that characteristic.
*3 Chemical Recycling into Oil: A recycling method that converts used plastics into oil and manufactures "chemical recycled products" using the produced CR oil as a raw material.
*4 CR Oil: Chemical Recycled oil. Oil equivalent to light crude oil produced by converting used plastics into oil.
*5 Post-Consumer Recycled (PCR) Plastic: Plastic products that are recycled and regenerated from plastic used by consumers (post-consumer materials), rather than scrap generated during manufacturing.
*6 Dry Soundproofing Double Floor: A double floor system with enhanced soundproofing performance, constructed by floating floor panels with support legs.
*7 Circular Design Build®: A construction method advocated by Takenaka Corporation that eliminates waste by incorporating the concept of a circular economy with the keywords "make, use, connect," moving away from the conventional scrap-and-build approach.