(19)
(11)EP 3 643 745 A3

(12)EUROPEAN PATENT APPLICATION

(88)Date of publication A3:
22.07.2020 Bulletin 2020/30

(43)Date of publication A2:
29.04.2020 Bulletin 2020/18

(21)Application number: 19217503.2

(22)Date of filing:  04.08.2017
(51)International Patent Classification (IPC): 
C08L 27/22(2006.01)
C08F 14/26(2006.01)
C08F 8/50(2006.01)
C08F 114/26(2006.01)
C08J 3/28(2006.01)
C10M 119/22(2006.01)
C08J 3/12(2006.01)
C08L 27/18(2006.01)
C08F 8/06(2006.01)
C08F 214/26(2006.01)
C08J 7/12(2006.01)
(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30)Priority: 04.08.2016 JP 2016153856

(62)Application number of the earlier application in accordance with Art. 76 EPC:
17837113.4 / 3385309

(71)Applicant: DAIKIN INDUSTRIES, LIMITED
Osaka-shi Osaka 530-8323 (JP)

(72)Inventors:
  • Yoshida, Ken
    Osaka, 530-8323 (JP)
  • Yoshida, Hirotoshi
    Osaka, 530-8323 (JP)
  • Hagi, Keisuke
    Osaka, 530-8323 (JP)
  • Tsuji, Masayuki
    Osaka, 530-8323 (JP)
  • Kato, Taketo
    Osaka, 530-8323 (JP)
  • Tanaka, Yuuji
    Osaka, 530-8323 (JP)
  • Yamanaka, Taku
    Osaka, 530-8323 (JP)
  • Kawahara, Kazuya
    Osaka, 530-8323 (JP)
  • Sukegawa, Masamichi
    Osaka, 530-8323 (JP)
  • Hosokawa, Kazutaka
    Osaka, 530-8323 (JP)

(74)Representative: Hoffmann Eitle 
Patent- und Rechtsanwälte PartmbB Arabellastraße 30
81925 München
81925 München (DE)

  


(54)POWDER COMPRISING LOW MOLECULAR WEIGHT POLYTETRAFLUOROETHYLENE AND USES THEREOF


(57) Powder comprising low molecular weight polytetrafluoroethylene (PTFE) having a melt viscosity of 1 x 102 to 7 x 105 Pa.s at 380°C, having an average particle size of 1.0-50 µm, having a specific surface area of 0.5-20 m2/g and containing ≥ 30 carboxyl groups at ends of the molecule chain per 106 carbon atoms in the main chain, the powder having a total content of C8-14 -perfluorocarboxylic acids and salts thereof of less than 25 ppb.





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