Title:
テトラフルオロエチレン重合体、エアフィルタ濾材、フィルタパック、および、エアフィルタユニット
Document Type and Number:
Japanese Patent JP6825685
Kind Code:
B2
Abstract:
There are provided a tetrafluoroethylene polymer that provides an air filter medium whose pressure loss can be reduced and made uniform at a plurality of positions, an air filter medium, a filter pack, and an air filter unit. The tetrafluoroethylene polymer has drawability and non-melt processability. The tetrafluoroethylene polymer has a ratio S2/S1 of 0.60 or more, where S2 represents an endotherm mJ/mg in a range of To°C or higher and 350°C or lower, T0°C is a temperature 2.5°C lower than a temperature Tp°C (340 ≤ Tp ≤ 345) at which a minimum point is given on a heat-of-fusion curve obtained by measuring an unbaked polymer for measurement having no history of heating to a temperature of 300°C or higher using a differential scanning calorimeter at a temperature-increasing rate of 2°C/min, and S1 represents an endotherm mJ/mg in a range of 320°C or higher and T0°C or lower. In the heat-of-fusion curve, a half-width HW that is a difference between temperatures at two intersection points of the heat-of-fusion curve and a line which is parallel to a baseline and passes through a half position of a vertical line extending from the minimum point at the temperature Tp°C to the baseline is 5.0 or more.
Inventors:
Kiritani Emi
Kunihiko Inui
Hideyuki Kiyotani
Kunihiko Inui
Hideyuki Kiyotani
Application Number:
JP2019221308A
Publication Date:
February 03, 2021
Filing Date:
December 06, 2019
Export Citation:
Assignee:
Daikin Industries, Ltd.
International Classes:
C08F14/26; B01D39/16; B01D46/52; B01D63/14; B01D71/36; C08J9/00
Domestic Patent References:
| JP2010037365A |
Foreign References:
| WO2007119829A1 | ||||
| WO2015080290A1 | ||||
| WO2015080291A1 | ||||
| WO2015080289A1 | ||||
| WO2005061567A1 |
Attorney, Agent or Firm:
Shinki Global IP Patent Corporation