Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber
Patent
1997-04-01
1998-09-15
Edwards, Newton
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Rod, strand, filament or fiber
428400, D02G 300
Patent
active
058076336
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELDS
The present invention relates to a polytetrafluoroethylene composite fiber, cotton-like materials obtained therefrom, processes for production thereof, and processes for producing a split yarn, a multifilament and a monofilament. The present invention particularly relates to the polytetrafluoroethylene composite fiber having remarkably improved thermal bonding property and the cotton-like materials obtained therefrom which are suitably used as materials for non-woven fabrics to be produceable by thermal bonding.
BACKGROUND ART
The polytetrafluoroethylene(PTFE) fibers have a low friction coefficient and are excellent in heat resistance, chemical resistance, electric insulation, hydrophobic property and air permeability. The PTFE fibers have been used, for example, as a bag filter by forming into a woven fabric or a felt-like non-woven fabric. However, in case of the felt-like non-woven fabric, there was a problem that falling of fibers occurs easily because there is no bonding between them. Once the PTFE fibers are sintered, no bonding occurs even if re-melting is carried out. The reason for that is that the bonding is difficult because a melt viscosity of PTFE is as high as from 10.sup.10 to 10.sup.13 poises.
Therefore, when the above-mentioned PTFE fibers once sintered are bonded in the molten state, there is no way other than applying a big pressure, and as a result, shape as a fiber becomes irregular.
From the reason mentioned above, the method of producing a non-woven fabric from the PTFE fibers once sintered is limited. Namely, there have been no way of producing a non-woven fabric other than simply intermingling the PTFE fibers by needle punching method or water jet needling method.
An object of the present invention is to provide the PTFE composite fiber having remarkably improved thermal bonding property, PTFE cotton-like materials which can be used to produce a non-woven fabric by thermal bonding, processes for production thereof, and processes for producing a split yarn, a monofilament and a multifilament having loop and/or branched structure.
DISCLOSURE OF THE INVENTION
The present invention relates to the polytetrafluoroethylene composite fiber having thermal bonding property and being provided with a layer of a thermofusing resin on at least a part of the surface of the polytetrafluoroethylene fiber.
The present invention also relates to the polytetrafluoroethylene composite fiber having thermal bonding property and shape of the polytetrafluoroethylene fiber is a monofilament.
The present invention also relates to the polytetrafluoroethylene composite fiber having thermal bonding property and the polytetrafluoroethylene fiber is a multifilament having loop and/or branched structure.
The present invention also relates to the polytetrafluoroethylene composite fiber having thermal bonding property and the polytetrafluoroethylene fiber is a split yarn.
The present invention also relates to the cotton-like materials having thermal bonding property and obtained from any one of the above-mentioned polytetrafluoroethylene composite fibers.
The present invention also relates to the process for producing the split yarn having thermal bonding property, characterized in that after forming a layer of a thermofusing resin having a melting point lower than that of a sintered polytetrafluoroethylene on at least a part of the surface of a polytetrafluoroethylene film, uniaxial stretching by at least 3 times is carried out at a temperature of not less than the melting point of the thermofusing resin and not more than the melting point of the sintered polytetrafluoroethylene, and the resulting uniaxially stretched film is further split.
The present invention also relates to the process for producing the multifilament having thermal bonding property and loop and/or branched structure, characterized in that after forming a layer of a thermofusing resin having a melting point lower than that of a sintered polytetrafluoroethylene on at least a part of the surface of a polytetrafluoroethylene
REFERENCES:
patent: 3001265 (1961-09-01), Bundy
patent: 3003223 (1961-10-01), Breen
patent: 3864903 (1975-02-01), Maki
patent: 4925710 (1990-05-01), Buck et al.
patent: 5217666 (1993-06-01), Tamaru et al.
patent: 5439741 (1995-08-01), Gibbon et al.
patent: 5456983 (1995-10-01), Sassa
patent: 5460883 (1995-10-01), Barber
patent: 5562986 (1996-10-01), Yamamoto et al.
patent: 5562987 (1996-10-01), Shimizu
Asano Jun
Chaen Shinichi
Tamaru Shinji
Yamamoto Katsutoshi
Daikin Industries Ltd.
Edwards Newton
LandOfFree
Polytetrafluoroethylene composite fiber, cotton-like materials o does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Polytetrafluoroethylene composite fiber, cotton-like materials o, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polytetrafluoroethylene composite fiber, cotton-like materials o will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-85313