Applicants from Japan worldwide contributed the largest number of silicone rubber foam patents. From the chart, we can see that more than half of the world's patent applications for silicone rubber foam come from Japan. At the same time, patent applications from China exceed 1/3 of the world's applications. Other applicants mainly come from the United States, the Soviet Union (Russia), Korea, Germany and other countries. Applicants from Europe, Denmark, Czech, Switzerland and other countries also submitted a small amount of patent applications. Patent application of silicone rubber foam. It can be seen that the global silicone rubber foam industry is dominated by China, Japan and Europe and the United States.
Among the major applicants in the world, applicants from Japan accounted for four of the top five applicants in the world, especially the Xinyue chemical company. The company filed a total of 67 patent applications, and its applications far exceeded other applicants. As one of the most comprehensive silicone companies in the world, the company has more applications in the field of silicone rubber foam materials. Strong comprehensive strength.
In addition, Japanese enterprises began to study silicone rubber foam materials since the 60s of last century. Up to now, a large number of patent applications have been submitted annually, while applicants from the United States and the USSR (Russia) have submitted patent applications related to silicone rubber foam earlier, but their patent continuity is poor. Many applicants have not submitted any patent applications in recent years. Its research work was gradually interrupted. It can be seen that Japanese enterprises have deep technical details and global patent layout in the field of silicone rubber foam materials, and their comprehensive strength is the most powerful.
In terms of priority date or application date, from 1956 to 1980, from 1981 to 1990, from 1991 to 2000, from 12 to 18, 65, 69 and 103, silicone rubber foams submitted to the world within the range of 1991 to 2000, and to "to". Before 1980, the development of silicone rubber foam was still in its infancy. In 1956, General Electric submitted its first patent application on silicone rubber foam. Thereafter, in 1958 and 1966, applicants from the Soviet Union, Switzerland and Japan (Shin Yue chemical) filed a patent application. At this stage, the research work of silicone rubber foam was mainly in the Soviet Union, Europe and the United States. Japan and other countries. The slow development period of silicone rubber foam was from 1981 to 1990. During this period, the number of patent applications increased gradually, and the number of patent applications increased rapidly from 1991 to now.
Due to the late start of China's organic silicon industry and the lags behind in its development, in 2004, applicants from China applied for the first time a patent application involving silicone rubber foam. China missed the most important development stage of silicone rubber foam materials.
However, through careful analysis, it can be seen that between 2004 and 2018, 92 patent applications were provided by patent applicants from China, while 85 patent applications were submitted by foreign applicants in the same period, especially from 2004 to 2018, the number of patent applications from Chinese applicants increased gradually, while the number of patent applications from foreign applicants remained basically unchanged. In particular, between 2015 and 2018, the annual application volume of Chinese applicants exceeded 15, while the annual application volume of foreign applicants in the same period was only 4. It can be seen that the research on silicone rubber foam in China is gradually decreasing, and the research in this field has been increasing.
As far as technical topics are concerned, the patent applications submitted by our applicants include not only the preparation methods of silicone rubber foam materials, but also the application of silicone rubber foam materials, not only about room temperature vulcanized silicone rubber, but also high temperature vulcanized silicone rubber. It involves not only silicone rubber matrix materials, but also the reinforcing system, foaming agent and preparation technology of silicone rubber. Branch. In particular, the number of patent applications of China Academy of Engineering Physics is the fourth in the world. In the patent field of silicone rubber foam, China's discourse power has gradually increased, and the overall strength of China's silicone rubber foam industry has gradually increased.