-
公开(公告)号：EP4393966A1
公开(公告)日：2024-07-03
申请号：EP22876585.5
申请日：2022-09-30
发明人： KATO, Taketo , YASUDA, Kohei , YAMANAKA, Taku , MIYAMOTO, Masayoshi , MURAYAMA, Kenta , USAMI, Ryota , YOSHIDA, Hirotoshi , SATO, Hiroyuki , YAMAMOTO, Emi , NISHIMURA, Kenta , URAOKA, Nobuki
摘要： The disclosure aims to provide a polytetrafluoroethylene fine powder containing less water and less impurities. Provided is a polytetrafluoroethylene fine powder substantially free from water and a fluorine-containing compound having a molecular weight of 1000 or less.
-
公开(公告)号：EP4289495A1
公开(公告)日：2023-12-13
申请号：EP22749748.4
申请日：2022-02-02
摘要： Provided are an air filter medium, a method for producing the air filter medium, a mask filter medium, and a pleated mask filter medium each on which has a low pressure loss, has high performance, and is less likely to cause clogging. An air filter medium (30) includes a fluororesin porous membrane (31) and an air-permeable supporting member (32) stacked on the fluororesin porous membrane (31). The fluororesin porous membrane (31) has a pressure loss of 80 Pa or less when air is passed at a flow rate of 5.3 cm/s. The fluororesin porous membrane (31) has a PF of 20 or more, the PF being determined from a formula PF = {-log((100 - collection efficiency (%))/100)}/(pressure loss (Pa)/1000) using the pressure loss and a collection efficiency determined using NaCl particles having a particle size of 0.1 µm. The fluororesin porous membrane (31) has a thickness of 10 µm or more. A dust-holding capacity of polyalphaolefin particles having a number median diameter of 0.25 µm is 15.0 g/m 2 or more when air containing the polyalphaolefin particles is continuously passed through the fluororesin porous membrane (31) at a flow rate of 5.3 cm/s and pressure loss increases by 250 Pa.
-
搜索结果
2 条记录 (耗时 0.01 秒)
