Key highlights
- Filed March 25, 2026 at the Shanghai Intellectual Property Court against Shanghai Songxuan New Materials and Huizhou Changlong Chemical.
- Seeks injunction against manufacture and sale and claims damages for infringement of Chinese patents covering water-based Duranol polycarbonate diol.
- Won a favorable final judgment in 2022 against another Chinese company at the Guangzhou Intellectual Property Court in a related patent case.
- Maintains a broader patent portfolio covering various aspects of polycarbonate diol.
Litigation filed
On March 25, 2026 Asahi Kasei filed suit at the Shanghai Intellectual Property Court against Shanghai Songxuan New Materials Co., Ltd. and Huizhou Changlong Chemical Co., Ltd.
Claims
The complaint seeks an injunction to halt manufacture and sale and requests damages for infringement of Chinese patents covering water-based grades of Duranol™ polycarbonate diol.
Prior ruling
In 2022 Asahi Kasei obtained a favorable final judgment on the same patent rights at the Guangzhou Intellectual Property Court against another Chinese company.
Patent coverage
Asahi Kasei maintains a patent portfolio addressing various aspects of polycarbonate diol.
