US 12,459,177 B2
Injection-molded body and production method therefor
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. 18/453,810.
Application 18/453,810 is a continuation of application No. PCT/JP2022/003660, filed on Jan. 31, 2022.
Claims priority of application No. 2021-031090 (JP), filed on Feb. 26, 2021; application No. 2021-031093 (JP), filed on Feb. 26, 2021; application No. 2021-031095 (JP), filed on Feb. 26, 2021; application No. 2021-031096 (JP), filed on Feb. 26, 2021; and application No. 2021-162162 (JP), filed on Sep. 30, 2021.
Prior Publication US 2023/0390981 A1, Dec. 7, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. B29C 45/00 (2006.01); B29C 45/78 (2006.01); B29K 27/12 (2006.01); B29K 27/18 (2006.01)
CPC B29C 45/0001 (2013.01) [B29C 45/78 (2013.01); B29K 2027/12 (2013.01); B29K 2027/18 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An injection molded article obtained by injection molding a copolymer using a mold provided with a gate,
wherein the copolymer comprises tetrafluoroethylene (TFE) unit and a fluoro(alkyl vinyl ether) (FAVE) unit,
wherein a content of the fluoro(alkyl vinyl ether) unit of the copolymer is 3.5 to 4.7% by mass with respect to the whole of the monomer units,
a melt flow rate at 372° C. of the copolymer is 22.0 to 35.0 g/10 min,
the total number of —CF═CF2, —CF2H, —COF, —COOH, —COOCH3, —CONH2 and —CH2OH of the copolymer is 20 or less per 106 main-chain carbon atoms, and
the injection molded article has a gate section corresponding to the gate of the mold, and a ratio of a maximum flow length (a) from the gate section of the injection molded article to an average value (b) of a product thickness on the maximum flow length, ((a)/(b)), is 80 to 200.