On May 21, 2026, information from the State Intellectual Property Office showed that Jiangsu Karen Building Materials Co., Ltd. successfully applied for a patent titled “A polyolefin elastomer film self-adhesive asphalt waterproofing membrane and its preparation method and application”. The authorization announcement number is CN116554800B, and the authorization announcement date is May 19, 2026.
The patent application publication number is CN116554800A, the application number is CN202310431794.6, and the application date is April 21, 2023.
The patent summary shows that this invention relates to a polyolefin elastomer film self-adhesive asphalt waterproofing membrane and its preparation method and application.
The membrane contains a polyolefin elastomer film layer, a barrier adhesive layer, a self-adhesive polymer modified asphalt layer and an isolation membrane layer arranged in sequence.
The raw materials of the self-adhesive polymer modified asphalt layer include petroleum asphalt, tackifying resin, modifier, softening oil and filler, and the mass ratio of petroleum asphalt, tackifying resin, modifier, softening oil and filler is 40~50:2~10:5~20:5~25:15~35.
Among them, the filler at least contains modified powder, and the modified powder is silica powder or quartz powder whose surface has been modified by an aminosilane coupling agent.
It is worth mentioning that the setting of the barrier bonding layer not only isolates the two materials of polyolefin elastomer and modified asphalt from each other without affecting each other, thereby improving the long-term stability of the waterproof membrane, but also firmly bonds the polyolefin elastomer film layer and the self-adhesive polymer modified asphalt layer together to avoid film separation, further improving the long-term stability and reliability of the waterproof membrane.
Kalen Holdings was established on July 13, 2011 and listed on the Shenzhen Stock Exchange on October 26, 2017.
The company is a leading supplier of new building waterproofing materials in China, with advantages across the entire industry chain, and its product quality and technical level are in a leading position in the industry.
Its main business is the research and development, production and sales of new building waterproof materials. The Shenwan industry it belongs to is building materials-decoration building materials-waterproof materials, and it also involves semiconductors, OLEDs, chip concepts and other sectors.
From the perspective of business data, Karen Shares’ operating income in 2025 is 2.41 billion yuan, ranking third among the three companies in the industry, far lower than the first place Dongfang Yuhong’s 27.579 billion yuan and the second place Keshun Shares’ 6.044 billion yuan. The industry average is 12.011 billion yuan, and the median is 6.044 billion yuan.
Among its main business components, waterproofing membranes accounted for 45.39% with RMB 1.094 billion, and waterproofing engineering construction accounted for 21.23% with RMB 512 million.
In terms of net profit, Karen Shares reached 38.475 million yuan in 2025, ranking first in the industry, higher than the second-placed Dongfang Yuhong’s 37.9821 million yuan. The industry average is -157 million yuan and the median is 37.9821 million yuan.
In addition, Jiangsu Kelun Building Materials Co., Ltd. has a number of patents recently.
For example, there are many invention patents and utility model patents such as the walkway system of the metal composite sandwich panel roof and the construction method of the walkway system, an EVM modified PVC waterproof membrane and its preparation method, etc.
These patents cover many aspects of the field of building waterproofing, fully demonstrating the strength and innovation capabilities of Karen Co., Ltd. in technology research and development, and providing strong support for its market competition.
