公开(公告)号：US09902787B2

公开(公告)日：2018-02-27

申请号：US15316032

申请日：2015-06-04

Applicant: DAIKIN INDUSTRIES, LTD.

Inventor： Yoshinori Nanba ,  Dai Fukami ,  Takuya Yamabe ,  Taketo Kato ,  Makoto Ono ,  Takahiro Taira ,  Hirotoshi Yoshida ,  Taku Yamanaka

IPC: C08F14/26 ,  C08J9/28

CPC classification number: C08F14/26 ,  C08F2/26 ,  C08F214/262 ,  C10M147/00 ,  C10M2213/0626

Abstract: The present invention provides a polytetrafluoroethylene powder having high dispersibility in lubricants. The polytetrafluoroethylene powder includes polytetrafluoroethylene containing a tetrafluoroethylene unit alone or a tetrafluoroethylene unit and a modifying monomer unit based on a modifying monomer copolymerizable with the tetrafluoroethylene, and has a specific surface area of 32 m2/g or larger.

公开(公告)号：US20240150533A1

公开(公告)日：2024-05-09

申请号：US18400039

申请日：2023-12-29

Applicant: DAIKIN INDUSTRIES, LTD.

Inventor： Takayuki TANAKA ,  Masayoshi Miyamoto ,  Tomoki Minamiyama ,  Takeki Kusunoki ,  Tokahiro Taira ,  Takuya Yamabe ,  Hirotoshi Yoshida ,  Taketo Kato ,  Taku Yamanaka ,  Mitsuo Tsukamoto

IPC: B29C71/02 ,  C08F114/26

CPC classification number: C08J7/08 ,  C08F114/26 ,  C08J2327/18

Abstract: A method for producing a polytetrafluoroethylene particle, which includes subjecting tetrafluoroethylene to suspension polymerization in an aqueous medium to prepare a suspension-polymerized particle of polytetrafluoroethylene, washing and then crushing the suspension-polymerized particle or crushing the suspension-polymerized particle with washing to prepare a crushed particle, dehydrating the crushed particle to prepare a crushed particle having a water content of 40% by mass or less, and subjecting the dehydrated crushed particle to heat treatment to produce a polytetrafluoroethylene particle.

公开(公告)号：US20240150505A1

公开(公告)日：2024-05-09

申请号：US18397595

申请日：2023-12-27

Applicant: DAIKIN INDUSTRIES, LTD.

Inventor： Takahiro TAIRA ,  Kazuhiro Mishima ,  Takayuki Tanaka ,  Takeki Kusunoki ,  Masayoshi Miyamoto ,  Tomoki Minamiyama ,  Mitsuo Tsukamoto ,  Kenji Ichikawa ,  Takuya Yamabe ,  Hirotoshi Yoshida ,  Taketo Kato ,  Taku Yamanaka

IPC: C08F214/26 ,  B29C43/00 ,  C08F2/18 ,  C08F6/24 ,  C08F8/22

CPC classification number: C08F214/262 ,  B29C43/003 ,  B29C43/006 ,  C08F2/18 ,  C08F6/24 ,  C08F8/22 ,  B29K2027/18

Abstract: A method for producing a polytetrafluoroethylene powder, which includes subjecting tetrafluoroethylene to suspension polymerization in an aqueous medium to prepare a suspension-polymerized particle of non melt-processible polytetrafluoroethylene, drying the suspension-polymerized particle to prepare a dry particle, subjecting the dry particle to fluorine radical treatment to prepare a fluorine radical-treated particle, and crushing the fluorine radical-treated particle to produce a polytetrafluoroethylene powder. Also disclosed is a polytetrafluoroethylene formed article obtained by forming the polytetrafluoroethylene powder, as well as a polytetrafluoroethylene compression-molded article obtained by compression molding the polytetrafluoroethylene powder.

公开(公告)号：US20220185917A1

公开(公告)日：2022-06-16

申请号：US17687325

申请日：2022-03-04

Applicant: Daikin Industries, LTD.

Inventor： Yoshinori NANBA ,  Emi Yamamoto ,  Takuya Yamabe ,  Yohei Fujimoto ,  Kenji Ichikawa ,  Taketo Kato ,  Taku Yamanaka ,  Hirotoshi Yoshida

IPC: C08F14/26

Abstract: A composition containing a polytetrafluoroethylene, a polymer (I) containing a polymerization unit (I) based on a monomer represented by the general formula (I), a nonionic surfactant, and an aqueous medium, wherein a content of the polytetrafluoroethylene in the composition is 10% by mass or more based on the composition, and a content of the nonionic surfactant in the composition is 1.0% by mass or more based on the polytetrafluoroethylene, CX1X3═CX2R(—VZ1Z2-A0)m   (I) wherein X1 and X3 are each independently F, Cl, H, or CF3; X2 is H, F, an alkyl group, or a fluorine-containing alkyl group; A0 is an anionic group; R is a linking group; Z1 and Z2 are each independently H, F, an alkyl group, or a fluorine-containing alkyl group; and m is an integer of 1 or more.

公开(公告)号：US09976022B2

公开(公告)日：2018-05-22

申请号：US15316031

申请日：2015-06-04

Applicant: DAIKIN INDUSTRIES, LTD.

Inventor： Yoshinori Nanba ,  Dai Fukami ,  Takuya Yamabe ,  Taketo Kato ,  Makoto Ono ,  Takahiro Taira ,  Hirotoshi Yoshida ,  Taku Yamanaka

IPC: C08L27/18 ,  C08F114/26

CPC classification number: C08L27/18 ,  C08F2/26 ,  C08F14/26 ,  C08K5/00 ,  C08K5/101 ,  C08L2201/54

Abstract: The present invention provides a polytetrafluoroethylene aqueous dispersion containing high-molecular-weight, significantly small polytetrafluoroethylene particles and having excellent dispersion stability. The present invention relates to an aqueous dispersion containing polytetrafluoroethylene particles containing a tetrafluoroethylene unit alone or a tetrafluoroethylene unit and a modifying monomer unit based on a modifying monomer copolymerizable with the tetrafluoroethylene. The polytetrafluoroethylene particles have a volume average particle size of not smaller than 0.1 nm but smaller than 20 nm, a melt flow rate of not lower than 0 g/10 min but lower than 80 g/10 min determined at 380° C. and 5 kg load, a melting point of 324° C. to 360° C., and an initial pyrolysis temperature of not lower than 400° C.