Freudenberg has been granted a patent for an electrically conductive paste. The paste includes an elastic binder and a conductive filler, which consists of at least one spherical, plate-like, and rod-like conductive filler. The spherical filler has a mean particle diameter of up to 200 µm. The content of the filler in relation to the overall weight of the paste ranges from 0.03 wt % to 25 wt %. GlobalData’s report on Freudenberg gives a 360-degree view of the company including its patenting strategy. Buy the report here.
According to GlobalData’s company profile on Freudenberg, electromagnetic valve actuators was a key innovation area identified from patents. Freudenberg's grant share as of September 2023 was 48%. Grant share is based on the ratio of number of grants to total number of patents.
A recently granted patent (Publication Number: US11776707B2) describes an electrically conductive paste that can be used in various applications. The paste consists of an elastic binder and a conductive filler, which includes at least one spherical, plate-like, and rod-like conductive filler. The content of the filler in relation to the overall weight of the conductive paste ranges from 0.03 wt % to 25 wt %.
The patent specifies certain characteristics of the conductive filler. The spherical filler should have a mean particle diameter of at most 200 µm, with a preferred range of 0.02 µm to 200 µm, and a maximum diameter of 100 µm. The plate-like filler should have an aspect ratio of at least 1/10 and smaller than 1/106, and a mean particle size of at most 150 µm. The rod-like filler should have a mean aspect ratio of at least 0.1.
The patent also mentions the content of each type of filler in relation to the overall weight of the conductive paste. The spherical filler should be present in a range of 0.1 to 25 wt %. The plate-like filler should be present in a range of 0.5 to 25 wt %. The rod-like filler should be present in a range of 0.01 to 10 wt %. The overall content of the filler in the conductive paste should be in the range of 0.03 wt % to 20 wt %.
The elastic binder in the conductive paste is specified to be thermoplastic elastomers. The paste itself has a stretchability of at least 30%, measured according to EN ISO 527-1 (February 2012). Additionally, the paste can be applied to elastomeric substrates.
The patent also includes methods for using and producing the electrically conductive paste. One method involves applying the conductive paste to elastomeric substrates. Another method involves producing or providing a dispersion with an elastic binder and introducing the conductive filler into the dispersion.
Overall, this patent describes an electrically conductive paste with specific characteristics and compositions that can be used in various applications, particularly those involving elastomeric substrates.
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