	US 12,467,572 B2
	Pipe joint and manufacturing method of pipe joint
Hayato Tsuda, Osaka (JP); Tadaharu Isaka, Osaka (JP); Yumi Zenke, Osaka (JP); Yukari Yamamoto, Osaka (JP); Yasuyuki Yamaguchi, Osaka (JP); and Hiroyuki Hamada, Osaka (JP)
Assigned to DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed by DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed on Aug. 22, 2023, as Appl. No. 18/453,690.
Application 18/453,690 is a continuation of application No. PCT/JP2022/007737, filed on Feb. 24, 2022.
Claims priority of application No. 2021-031086 (JP), filed on Feb. 26, 2021.
Prior Publication US 2023/0392737 A1, Dec. 7, 2023
Int. Cl. B29C 45/26 (2006.01); B29C 45/14 (2006.01); B29C 45/72 (2006.01); B29D 23/00 (2006.01); C08F 214/26 (2006.01); F16L 41/02 (2006.01); B29C 45/17 (2006.01); B29C 45/36 (2006.01); B29K 27/18 (2006.01); B29K 105/00 (2006.01); B29L 23/00 (2006.01)

CPC F16L 41/021 (2013.01) [B29C 45/14065 (2013.01); B29C 45/261 (2013.01); B29C 45/7207 (2013.01); B29D 23/001 (2013.01); C08F 214/262 (2013.01); B29C 2045/1719 (2013.01); B29C 2045/363 (2013.01); B29K 2027/18 (2013.01); B29K 2105/0085 (2013.01); B29K 2995/0077 (2013.01); B29K 2995/0097 (2013.01); B29L 2023/22 (2013.01); C08F 2800/20 (2013.01)]

7 Claims

1. A pipe joint comprising a cylindrical hollow, wherein

a wall thickness of a part having the largest wall thickness of the pipe joint is 2 to 7 mm,

a ratio of a length of the hollow in an axial direction (L) to a diameter of the hollow (D), (L/D), is 5 or less,

the pipe joint comprises a copolymer comprising tetrafluoroethylene unit and a fluoro(alkyl vinyl ether) unit,

a content of the fluoro(alkyl vinyl ether) unit of the copolymer is 2.8 to 6.0% by mass with respect to the whole of the monomer units, a melt flow rate at 372° C. of the copolymer is 4.0 g/10 min or higher and lower than 11.0 g/10 min, and the total number of —CF═CF₂, —CF₂H, —COF, —COOH, —COOCH₃, —CONH₂and —CH₂OH of the copolymer is 50 or less.