EP 0119185 B1 19890118 - METHOD FOR THE PREPARATION OF HIGHLY FIRE-RETARDING, HEAT-RESISTING POLYIMIDE FIBRES
Title (en)
METHOD FOR THE PREPARATION OF HIGHLY FIRE-RETARDING, HEAT-RESISTING POLYIMIDE FIBRES
Publication
Application
Priority
AT 82083 A 19830309
Abstract (en)
[origin: CA1229209A] A method of producing non-flammable, hightemperature resistant polyimide fibers according to the dry-spinning technique from a solution in aprotic organic solvents. The fibers obtained are to have irregularly lobed or serrated cross-sections, a wool-like smooth hand and high brightness. The dry-spinning process is carried out in a spinning column, wherein a 20 to 40 % solution of the polyimide is spun from spinnerets having circular orifices, the orifice numbers ranging from 20 to 800 and the orifice diameters from 100 to 300 .mu.m. An extrusion speed of between 20 and 100 m/min, a take-up speed of between 100 and 800 m/min, an amount of spin gas between 40 and 100 m3/h under standard conditions and a spin gas temperature of between 200 and 350.degree.C are applied. The tows leaving the spinning column, which contain residual solvent from 5 to 25 % by weight - based on dry polymer - and have a single filament titer of between 3.5 and 35 dtex, are washed in hot water, then they are dried to a moisture content of less than 5 %, subsequently are drawn at high temperatures and, if desired, are crimped and cut into staple fibers.
IPC 1-7
IPC 8 full level
D01D 5/04 (2006.01); D01D 5/253 (2006.01); D01F 6/74 (2006.01)
CPC (source: EP US)
D01F 6/74 (2013.01 - EP US); Y10T 428/2904 (2015.01 - EP US); Y10T 428/2913 (2015.01 - EP US); Y10T 428/2973 (2015.01 - EP US)
Designated contracting state (EPC)
DE FR GB IT NL
DOCDB simple family (publication)
EP 0119185 A2 19840919; EP 0119185 A3 19861126; EP 0119185 B1 19890118; AT 377016 B 19850125; AT A82083 A 19840615; CA 1229209 A 19871117; DE 3476227 D1 19890223; JP S59168120 A 19840921; JP S6327444 B2 19880603; US 4801502 A 19890131
DOCDB simple family (application)
EP 84890036 A 19840301; AT 82083 A 19830309; CA 449016 A 19840307; DE 3476227 T 19840301; JP 4535784 A 19840308; US 4897587 A 19870511