US 9,809,905 B2
Amorphous polyetherimide fiber and heat-resistant fabric
Ryokei Endo, Tokyo (JP); Yosuke Washitake, Kurashiki (JP); Yukie Hashimoto, Tokyo (JP); and Akihiro Uehata, Kurashiki (JP)
Assigned to KURARAY CO., LTD., Kurashiki-shi (JP)
Filed by Ryokei Endo, Tokyo (JP); Yosuke Washitake, Kurashiki (JP); Yukie Hashimoto, Tokyo (JP); and Akihiro Uehata, Kurashiki (JP)
Filed on Sep. 16, 2011, as Appl. No. 13/234,561.
Application 13/234,561 is a continuation of application No. PCT/JP2010/051709, filed on Feb. 5, 2010.
Claims priority of application No. 2009-075732 (JP), filed on Mar. 26, 2009.
Prior Publication US 2012/0015184 A1, Jan. 19, 2012
Int. Cl. D02G 3/00 (2006.01); D02G 1/00 (2006.01); D01D 5/08 (2006.01); D01F 6/74 (2006.01); D01F 6/66 (2006.01)
CPC D01D 5/08 (2013.01) [D01F 6/66 (2013.01); D01F 6/74 (2013.01); D10B 2331/06 (2013.01); Y10T 428/2913 (2015.01)] 17 Claims
 
1. An amorphous polyetherimide fiber comprising an amorphous polyetherimide polymer having a weight-average molecular weight (Mw) of about 1,000 to about 32,000 and a molecular weight distribution (Mw/Mn) of less than 2.5, and having a shrinkage percentage under dry heat at 200° C. of 5% or less, a single fiber fineness of 3.0 dtex or less, and a tenacity of the fiber at room temperature is 2.0 cN/dtex or greater, wherein the fiber is an undrawn melt spun fiber.