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Polybenzazole fiber and article comprising the same

a technology of polybenzazole fiber and polybenzazole fiber, which is applied in the directions of yarn, textiles and paper, transportation and packaging, etc., can solve the problems of lower elastic modulus, poor impact resistance and fragility of carbon fiber, and carbon fibers, and achieves the effect of high heat resistance, very little decrease in the strength of such yarns, and durable yarns

Inactive Publication Date: 2007-05-10
TOYOBO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides polybenzazole fibers that show less decrease in strength even after yarns have had kink bands due to damages, and even after exposure to high temperatures and high humidity over a long period of time. The polybenzazole fibers have a strength retention of 80% or more, and the average strength of a single polybenzazole fiber with a diameter of 5 to 22 μm and a length of 100 mm is 4.5 GPa or more. The polybenzazole fibers have a coefficient of variation of the diameters of a single filament of 0.08 or less, and a stoichiometric ratio of inorganic base to mineral acid of 0.8 to 1.4. The polybenzazole fibers can be used to reinforce materials such as rubber, fiber-reinforced composite materials, ropes, sail cloths, knife-proof materials, and bullet-proof vests.

Problems solved by technology

Carbon fibers, however, have a problem in their poor impact resistance and fragility, although having very excellent dynamical performance.
Aramid fibers have relatively high impact resistance, but have a lower elastic modulus than the carbon fibers and thus are poor in reinforcing effect.
The knife-proof materials or bullet-proof vests made of the aramid fibers require lots of the fibers to exhibit the desired protective performance, and thus are thick and heavy in weight and are uncomfortable to wear.
However, the polybenzazole fibers are susceptible to mechanical damages in the course of manufacturing of ropes, since they have very highly oriented molecular chain structures.
Carbon fibers have a higher tensile elastic modulus than para-aramid fibers, and thus are expected to improve the performance of a yacht sail made thereof, but are easily bent and thus are inferior in fatigue resistance.

Method used

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  • Polybenzazole fiber and article comprising the same
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  • Polybenzazole fiber and article comprising the same

Examples

Experimental program
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Effect test

example 1

[0099] Under a stream of a nitrogen gas, 4,6-diaminoresorcinol dihydrochloride (334.5 g), terephthalic acid (260.8 g) and 122% polyphosphoric acid (2,078.2 g) were stirred at 60° C. for one hour, and the mixture was gradually heated so as to be reacted at 135° C. for 25 hours, at 150° C. for 5 hours and at 170° C. for 20 hours. Threne (14.8 g) was added to the resultant poly(p-phenylenebenzobisoxazole) dope (2.0 kg) having an intrinsic viscosity of 29 dL / g at 30° C., measured using a methanesulfonic acid solution, and the mixture was stirred.

[0100] After that, the resultant dope was spun to make filaments each singly having a diameter of 11.5 μm and a fineness of 1.5 denier. That is, the dope was extruded through a nozzle having 166 holes with diameters of 0.18 mm at 175° C. to make the filaments, which were then dipped and solidified in a first washing bath so located as to converge the filaments at an appropriate position to make a multi-filament. A quench chamber was provided in...

example 2

[0113] Under a stream of a nitrogen gas, 4,6-diaminoresorcinol dihydrochloride (334.5 g), terephthalic acid (260.8 g) and 122% polyphosphoric acid (2,078.2 g) were stirred at 60° C. for one hour, and the mixture was gradually heated so as to be reacted at 135° C. for 25 hours, at 150° C. for 5 hours and at 170° C. for 20 hours. Copper phthalocyanine (14.8 g) was added to the resultant poly(p-phenylenebenzobisoxazole) dope (2.0 kg) having an intrinsic viscosity of 30 dL / g at 30° C., measured using a methanesulfonic acid solution, and the mixture was stirred.

[0114] After that, the resultant dope was spun to make filaments each singly having a diameter of 11.5 μm and a fineness of 1.5 denier. That is, the dope was extruded through a nozzle having 166 holes with diameters of 0.18 mm at 175° C. to make the filaments, which were then dipped and solidified in a first washing bath so located as to converge the filaments at an appropriate position to make a multi-filament. A quench chamber ...

example 3

[0127] Under a stream of a nitrogen gas, 4,6-diaminoresorcinol dihydrochloride (334.5 g), terephthalic acid (260.8 g) and 122% polyphosphoric acid (2,078.2 g) were stirred at 60° C. for one hour, and the mixture was gradually heated so as to be reacted at 135° C. for 25 hours, at 150° C. for 5 hours and at 170° C. for 20 hours. Copper phthalocyanine (14.8 g) was added to the resultant poly(p-phenylenebenzobisoxazole) dope (2.0 kg) having an intrinsic viscosity of 30 dL / g at 30° C., measured using a methanesulfonic acid solution, and the mixture was stirred.

[0128] After that, the resultant dope was spun to make filaments each singly having a diameter of 11.5 μm and a fineness of 1.5 denier. That is, the dope was extruded through a nozzle having 166 holes with diameters of 0.18 mm at 175° C. to make the filaments, which were then dipped and solidified in a first washing bath so located as to converge the filaments at an appropriate position to make a multi-filament. A quench chamber ...

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Abstract

The present invention relates to polybenzazole fibers which can still have high durability against atmospheres of high temperatures and high humidity even after yarns made thereof have had kink bands therein due to the damages in the course of post-processing for making woven fabrics, knitted fabrics, braids, ropes and cords. The invention also relates to articles comprising the polybenzazole fibers, particularly spun yarns, rubber-reinforcing materials, fiber-reinforced composite materials, woven or knitted fabrics, knife-proof materials or bullet-proof vests, ropes and sail cloths.

Description

FIELD OF THE INVENTION [0001] The present application has been filed claiming the priority based on the Japanese patent application Nos. 2003-412681, 2003-424648, 2003-424649, 2003-424650; 2003-424651, 2003-424652, 2003-424653, 2003-424654 and 2003-424655, and a whole of the descriptions of these applications are herein fully incorporated in the description of the present specification by reference. [0002] The present invention relates to polybenzazole fibers which can still have high durability against atmospheres of high temperatures and high humidity even after yarns made thereof have had kink bands therein due to the damages in the course of post-processing for making woven fabrics, knitted fabrics, braids, ropes and cords. The invention also relates to articles comprising the polybenzazole fibers, particularly spun yarns, rubber-reinforcing materials, fiber-reinforced composite materials, woven or knitted fabrics, knife-proof materials or bullet-proof vests, ropes and sail clot...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D02G3/00D01F6/74
CPCY10T428/2913D01F6/74
Inventor KIRIYAMA, KOHEIMURASE, HIROKIABE, YUKIHIRO
Owner TOYOBO CO LTD
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