JP2857104B2 - Polypropylene fiber and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a novel polypropylene fiber and a method for producing the same. Specifically, the present invention relates to a polypropylene fiber having high productivity and excellent dyeability of the obtained fiber, and a method for producing the same.

[0002]

2. Description of the Related Art Numerous reports have been made on techniques for improving the dyeability of polypropylene fibers. As one of the methods, there is a method of blending a polar polymer such as nylon, polystyrene, polyvinyl pyridine, and polyglycidyl methacrylate effective for dyeing polypropylene, and some of these methods have already been put to practical use.
However, polypropylene has poor compatibility with other polymers, and the blend has a so-called sea / island structure depending on the mixing ratio. For example, in the case of a polypropylene fiber having the above-mentioned polar polymer, the added polar polymer generally has an island structure when the amount added to the polypropylene is relatively small. Therefore, when melt-spinning is used as a raw material, yarn breakage tends to occur during production depending on the amount of the polar polymer to be added, and even if melt-spinning is possible, the strength of the obtained fiber is considerably reduced. Was.

[0003] In order to solve the above-mentioned problem, the present inventor has proposed a method for producing polypropylene fibers having an average particle diameter of 0.1 to 0.1.
It was reported that 0.2 μm fine cross-linked polymer particles of a polar polymer were synthesized in advance, and blended with polypropylene to refine the polar polymer island structure and improve the dyeability of polypropylene fibers (Yukio Mizuta
ni, Bull. Chem. Soc. Jpn., 40, 1519 (1967)).

[0004]

However, in the above-mentioned method, the dispersibility of the crosslinked polymer particles of the polar polymer is not sufficient, and the crosslinked polymer particles have a strong cohesiveness and a high dispersion state in polypropylene. Was not easy to mix. For this reason, it is difficult to sufficiently increase the compounding amount, and there is room for further improvement in dyeing properties. Further, there is a problem that the dyed polypropylene fiber is in a matte state without gloss and does not have a good texture as the fiber.

[0005]

Means for Solving the Problems In view of the above-mentioned problems, the present inventors have intensively studied to obtain polypropylene fibers having good dyeability, gloss, and high chroma.
As a result, by using a polypropylene composition in which crosslinked polymer particles obtained by polymerizing a vinyl monomer having a glycidyl group of a specific average particle system, a maleimide monomer and a crosslinker in polypropylene are finely dispersed, It has been found that the above problem can be solved, and the present invention has been completed.

That is, the present invention relates to a crosslinked polymer obtained by polymerizing polypropylene, 15 to 70% by weight of a vinyl monomer having a glycidyl group, 20 to 75% by weight of a maleimide monomer and 1 to 10% by weight of a crosslinking agent. And crosslinked polymer particles in polypropylene having an average particle size of 0.01 to
It is a polypropylene fiber composed of a polypropylene composition finely dispersed as particles of 0.1 μm.

The present invention also provides a method for producing the above-mentioned polypropylene fiber, wherein 15 to 70% by weight of a vinyl monomer having a glycidyl group, 20 to 75% by weight of a maleimide-based monomer, and a crosslinking agent in a polypropylene in a molten state. The present invention also provides a method for producing a polypropylene fiber, comprising melt-spinning the polypropylene composition according to claim 1 obtained by polymerizing 1 to 10% by weight.

In the present invention, the polypropylene composition used as a fiber material has an average particle size of 0.01 to 0.1 μm, preferably 0.01 to 0.1 μm, in polypropylene.
0.08 μm, more preferably 0.01 to 0.07 μm
15 to 70% by weight, preferably 20 to 60% by weight, more preferably 12 to 70% by weight of a vinyl monomer having a glycidyl group
To 47% by weight, 20 to 75% by weight of a maleimide monomer,
Preferably 40-75% by weight, more preferably 48-73% by weight.
It is necessary that crosslinked polymer particles obtained by polymerizing the polymer by weight and 1 to 10% by weight, preferably 3 to 10% by weight of the crosslinking agent are finely dispersed. By finely dispersing such fine crosslinked polymer particles, the resulting polypropylene fiber is melted despite containing a sufficient amount of glycidyl vinyl monomer and maleimide monomer unit for dyeing. There is no occurrence of yarn breakage during spinning, and it can be obtained with extremely high productivity. Here, it is preferable that the finely dispersed crosslinked polymer particles are satisfactorily dispersed in a state in which the particles do not substantially aggregate.

The average particle size of the crosslinked polymer particles is 0.1 μm
If it is larger, the melt spinning will be inferior in moldability such as yarn breakage, and the dyeability will also be poor, which is not preferable.
If the average particle diameter is smaller than 0.01 μm, it is difficult to produce.

The average particle size of the crosslinked polymer particles can be measured by dyeing a fiber embedded with an epoxy resin with ruthenium tetroxide and observing the fiber with a transmission electron microscope. The particle diameter refers to the major axis.

In the present invention, as the vinyl monomer having a glycidyl group, a known vinyl monomer having one or more glycidyl groups is used. For example, glycidyl acrylate and glycidyl methacrylate are generally mentioned. These vinyl monomers having a glycidyl group may be used alone or in combination of two or more.

As the maleimide-based monomer, a known one having a maleimide group can be used. For example, alkylmaleimides such as maleimide, N-methylmaleimide and N-ethylmaleimide, and arylmaleimides such as N-phenylmaleimide are generally mentioned. These maleimide monomers may be used alone or in combination of two or more.

Further, as the crosslinking agent, known crosslinking agents used in radical polymerization can be used without any limitation. For example, a crosslinking agent such as a divinyl compound and a trivinyl compound can be used. More specifically, divinylbenzene, trivinylbenzene, 1,2-
Crosslinking agents such as distyrylethane and ethylene glycol dimethacrylate can be mentioned.

Here, even when the amount of the vinyl monomer having a glycidyl group and the amount of the maleimide monomer used are outside the range specified by the present invention, the obtained fiber has good dyeability. However, when it is in the above range, the color saturation of the fiber is particularly remarkably excellent. On the other hand, if the amount of the cross-linking agent is more than 10% by weight, the moldability during melt spinning will be poor, and if it is less than 1% by weight, the dyeability will be poor.

In the present invention, the production method of the above-mentioned polypropylene composition is not particularly limited,
In general, it can be obtained by polymerizing a vinyl monomer having a glycidyl group, a maleimide-based maleimide-based monomer and a crosslinking agent in a polypropylene in a molten state. In general, a copolymer of a vinyl monomer having a glycidyl group and a maleimide-based maleimide-based copolymer obtained by polymerization of a monomer alone undergoes phase separation because they have no compatibility with polypropylene. And the crosslinking agent promotes this phase separation. Further, since the diffusion rate of the vinyl monomer and the maleimide-based monomer in the molten polypropylene is low, the vinyl monomer and the maleimide-based monomer are cross-linked by being finely dispersed in the molten polypropylene. As a result, the obtained crosslinked polymer particles are finely dispersed without aggregating at the fine average particle diameter.

However, in this case, since the polymerization is radical polymerization, in addition to graft polymerization of vinyl monomers and maleimide monomers onto polypropylene molecules, gel formation which makes spinning difficult due to cross-linking polymerization is performed. Is generally expected. However, although it has not been elucidated yet that the formation of the gel has been confirmed, in the present invention, an unpredictable effect that there is no problem in the spinning step was obtained. In addition to the above-mentioned effects, the present invention also has an effect that the polypropylene fibers are glossy and have high chroma despite the inclusion of the crosslinked polymer particles. However, at the present time, the mechanism by which the dyed yarn obtained by the present invention has such a fastness that it does not decolor even by extraction with acetone is unknown.

The specific method of polymerizing the vinyl monomer having a glycidyl group and the maleimide monomer in the above-mentioned molten polypropylene with a crosslinking agent is not particularly limited. And a polypropylene powder are supplied into an extruder and polymerized.

As the polymerization initiator in the above polymerization, known radical polymerization initiators can be used without any limitation. Specifically, azobisisobutyronitrile, benzoyl peroxide, dicumyl peroxide, Di-t-butyl peroxide and the like can be mentioned. The polymerization initiator may be added in advance to the polypropylene,
You may add simultaneously at the time of the said monomer and addition of a crosslinking agent.

The amount of the polymerization initiator to be used is not particularly limited, but is generally from 0.5 to 0.5 parts by weight based on 100 parts by weight of the total amount of the vinyl monomer having a glycidyl group, the maleimide monomer and the crosslinking agent. 8 parts by weight, preferably 1 to 5 parts by weight are suitable.

Further, the polymerization time varies depending on the proportions of the monomer and the crosslinking agent and cannot be determined unconditionally, but is generally preferably about 0.1 to 5 minutes.

In this manner, crosslinked polymer particles of a vinyl monomer having a glycidyl group and a maleimide monomer and a crosslinker can be produced in the molten polypropylene. In addition, the total concentration of the vinyl monomer unit having a glycidyl group and the maleimide monomer unit contained in the obtained composition is preferably 0.1 to obtain good dyeability.
The range is preferably from 0.5 to 1.0 meq / g, and more preferably from 0.1 to 0.3 meq / g.

In the present invention, known polypropylenes are used without any particular limitation. For example, a homopolymer of propylene and a copolymer with another monomer copolymerizable with propylene can be exemplified. Specific examples of such other copolymerizable monomers include α-olefins other than propylene, such as ethylene, butene-1, pentene-1, and hexene-1. These other monomers can be used alone or in combination of two or more. The amount of the other monomer used is preferably 30% by weight or less based on propylene. Further, the molecular weight of polypropylene is preferably such that the melt index as an index is in the range of 10 to 50 g / 10 minutes from the viewpoint of melt spinnability of the polypropylene composition.

In the present invention, the melt spinning using the polypropylene composition can be carried out in the molten state after the polypropylene composition is produced by the above-mentioned method. 50 ~
After heating at 100 ° C. to polymerize the remaining unpolymerized vinyl monomer or maleimide monomer having a glycidyl group and the crosslinking agent, it is preferable to perform melt spinning. Further, in order to prevent yarn breakage, contamination of the working environment, and the like, which may occur due to each monomer slightly remaining in the polypropylene composition during drawing after melt spinning or after drawing, the pellets are reduced under reduced pressure to 70 to 70%. It is preferable to heat at a temperature of 150 ° C. to remove the remaining volatile components.

It is preferable to add a stabilizer to the polypropylene composition. As such compounding agents,
Known hindered phenol-based stabilizers, hindered amine-based stabilizers, phosphite-based stabilizers, sulfur-containing stabilizers, and the like can be suitably used as the polypropylene stabilizer.
The stabilizer may be added in advance when producing the polypropylene composition, but is preferably added after producing the polypropylene composition. That is, it is preferable to re-granulate the pellets of the polypropylene composition obtained after the crosslinking polymerization using a vent together with a stabilizer. In general, the amount of the stabilizer is preferably about 0.1 to 2.0% by weight based on the total amount of the stabilizer and polypropylene.

As the melt spinning method, a known method is employed without any particular limitation. In addition, the polypropylene fiber obtained by melt spinning is drawn as needed. The stretching is suitably performed at a linear magnification of 5 to 10 times, and when the film is stretched at such a stretching ratio, in the present invention, a fiber having good tensile strength can be obtained without trouble such as thread breakage of the fiber.

The polypropylene fiber obtained by the method of the present invention can be dyed by a known method. Usually, a method of dyeing with a disperse dye by a high temperature dyeing method or a carrier dyeing method is generally used. At this time, although the exact mechanism is unknown, an unpredictable result that the dye was not eluted even when the dyed yarn was treated with acetone was obtained. This indicates that the washing fastness is sufficient.

[0027]

As will be understood from the above description, according to the method of the present invention, a polypropylene fiber having extremely good dyeing properties, gloss and high color saturation can be cut at the time of melt spinning. There is no occurrence, and it is possible to obtain with high productivity. In addition, the chroma of the polypropylene fiber when dyed is maintained well even if the fiber is treated with an organic solvent such as acetone, and the polypropylene fiber of the present invention has extremely excellent washing fastness.

[0028]

EXAMPLES The present invention will be described in more detail with reference to examples and comparative examples, but the present invention is not limited to these examples. In addition, the physical property of the polypropylene fiber shown in the examples and the chroma indicating the dyeing property are values measured by the following methods. Denier (g / 9000m); weight of fiber per 9000m length. -Elongation (%): Using a tensile tester Autograph 200 manufactured by Shimadzu Corporation, sample length 100 mm, tensile speed 300
% / Min. -Breaking strength (g / d): Using an Autograph 200 manufactured by Shimadzu Corporation, sample length 100 mm, tensile speed 300%
/ Min. -Young's modulus (g / d); using an Autograph 200 manufactured by Shimadzu Corporation, sample length 100 mm, tensile speed 300%
/ Min. -Saturation: 1 g of fiber is placed in a glass cylindrical sample case with a diameter of 4 cm and a height of 0.5 cm, and Suga Test Machine Co., Ltd.
The color was measured by H, C, L display using SM Color Computer Model 3 manufactured by KK.

Example 1 To 100 parts by weight of a monomer mixture comprising 45.0% by weight of glycidyl methacrylate, 50.0% by weight of N-phenylmaleimide and 5% by weight of divinylbenzene was added di-t-
Butyl peroxide was added at a ratio of 1.5 parts by weight. The above monomer mixture was sufficiently mixed in advance at a ratio of 7 parts by weight with respect to 100 parts by weight of polypropylene powder (melt index: 16 g / 10 minutes, no stabilizer),
Next, the mixture was heated and melted at a temperature of 170 to 220 ° C. in a twin-screw extruder, polymerized, and then pelletized. The pellets were allowed to stand at 70 ° C.
2,6-Ditert-butyl-4-methylphenol was added as a stabilizer at a ratio of% by weight, and was subjected to melt spinning. The melt spinning was performed using a spinning machine at 280 ° C., followed by 6-fold stretching at 130 ° C. As a result, it could be carried out without any problems such as thread breakage and nozzle clogging.

The physical properties of the obtained polypropylene fiber were as follows: denier: 1.2 (g / 9000 m), elongation: 19 (%), tensile strength: 7.5 (g / d), Young's modulus: 58 (g / d) )Met.

When the obtained polypropylene fiber was observed with a transmission electron microscope, the average particle diameter was 0.05 μm.
Of glycidyl methacrylate-N-phenylmaleimide-divinylbenzene cross-linked polymer particles were present in a dispersed state. The concentration of the glycidyl group was 0.07 meq / g, and the concentration of the imide group was 0.07 meq / g.

The obtained polypropylene fiber was converted to Kayal.
on Polyester REDBL-E, Kaya
lon Polyester EBL-E (all trade names, manufactured by Nippon Kayaku Co., Ltd.), Sumikaron Or
angel SE-B (trade name, Sumitomo Chemical Co., Ltd.)
As a result, Carrier dyeing was performed, and glossy and good dyed yarn was obtained. Further, even if the dyed yarn was washed with acetone, some coloring was observed in acetone, but the state of dyeing hardly changed, and the chroma was 39.0.

The pellets of the polypropylene composition before spinning were subjected to Soxhlet extraction using meta-xylene, and as a result, cylindrical filter paper (# 86R) having a pore size of 1 μm was almost completely extracted. This indicates that the polymerized glycidyl methacrylate-N-phenylmaleimide-divinylbenzene crosslinked copolymer particles are minute.

Example 2 100 parts by weight of a monomer mixture comprising 23.75% by weight of glycidyl methacrylate, 71.25% by weight of N-phenylmaleimide and 5% by weight of divinylbenzene were added to di-
1.5 parts by weight of t-butyl peroxide was added. The monomer mixture was sufficiently mixed in advance at a ratio of 7 parts by weight with respect to 100 parts by weight of polypropylene powder (melt index: 16 g / 10 minutes, no stabilizer), and then 170-220 in a twin-screw extruder. The mixture was heated and melted at a temperature of ° C., polymerized, and then pelletized. The pellets were left overnight at 70 ° C in N2,
0.5% by weight of 2,6-di-tert-butyl-
4-Methylphenol was added as a stabilizer and subjected to melt spinning. The melt spinning was performed using a spinning machine at 280 ° C., followed by 6-fold stretching at 130 ° C. As a result, the operation could be performed without breaking the yarn and clogging the nozzle.

The physical properties of the obtained polypropylene fiber were as follows: denier: 1.1 (g / 9000 m), elongation: 18
(%), Tensile strength: 6.6 (g / d), Young's modulus: 56
(G / d).

When the obtained polypropylene fiber was observed with a transmission electron microscope, the average particle size was 0.05 μm.
Of glycidyl methacrylate-N-phenylmaleimide-divinylbenzene cross-linked polymer particles were present in a dispersed state. The concentration of the glycidyl group was 0.04 meq / g, and the concentration of the imide group was 0.11 meq / g.

The obtained polypropylene fiber was converted to Kayal.
on Polyester REDBL-E, Kaya
lon Polyester EBL-E (all trade names, manufactured by Nippon Kayaku Co., Ltd.), Sumikaron Or
angel SE-B (trade name, Sumitomo Chemical Co., Ltd.)
As a result, Carrier dyeing was performed, and glossy and good dyed yarn was obtained. Further, when the dyed yarn was washed with acetone, some coloring was observed in the acetone, but the dyeing condition was hardly changed, and the saturation was 41.8.

The pellets of the polypropylene composition before spinning were subjected to Soxhlet extraction using meta-xylene, and as a result, cylindrical filter paper (# 86R) having a pore size of 1 μm was almost completely extracted. This indicates that the polymerized glycidyl methacrylate-N-phenylmaleimide-divinylbenzene crosslinked copolymer particles are minute.

Example 3 Di-t-t- was added to 100 parts by weight of a monomer mixture comprising 22.25% by weight of glycidyl acrylate, 69.75% by weight of N-methylmaleimide and 8% by weight of divinylbenzene.
Butyl peroxide was added at a ratio of 1.5 parts by weight. The above monomer mixture was sufficiently mixed in advance at a ratio of 7 parts by weight with respect to 100 parts by weight of polypropylene powder (melt index: 16 g / 10 minutes, no stabilizer),
Next, the mixture was heated and melted at a temperature of 170 to 220 ° C. in a twin-screw extruder, polymerized, and then pelletized. The pellets were allowed to stand overnight at 70 DEG C. in N2 and then subjected to melt spinning with the addition of 0.5% by weight of 2,6-ditert-butyl-4-methylphenol as a stabilizer.
The melt spinning was performed using a spinning machine at 280 ° C., followed by 6-fold stretching at 130 ° C. As a result, it could be carried out without any problems such as thread breakage and nozzle clogging.

The physical properties of the obtained polypropylene fiber were as follows: denier: 1.1 (g / 9000 m), elongation: 14 (%), tensile strength: 6.9 (g / d), Young's modulus: 59 (g / d) )Met.

When the obtained polypropylene fiber was observed with a transmission electron microscope, the average particle diameter was 0.04 μm.
Of glycidyl acrylate-N-methylmaleimide-divinylbenzene cross-linked polymer particles were present in a dispersed state. The concentration of the glycidyl group was 0.03 meq /
g, the concentration of the imide group was 0.1 meq / g.

The obtained polypropylene fiber was converted to Kayal.
on Polyester REDBL-E, Kaya
lon Polyester EBL-E (all trade names, manufactured by Nippon Kayaku Co., Ltd.), Sumikaron Or
angel SE-B (trade name, Sumitomo Chemical Co., Ltd.)
As a result, Carrier dyeing was performed, and glossy and good dyed yarn was obtained. Further, when the dyed yarn was washed with acetone, some coloring was observed in the acetone, but the dyeing condition was hardly changed, and the chroma was 40.0.

The pellets of the polypropylene composition before spinning were subjected to Soxhlet extraction using meta-xylene, and as a result, cylindrical filter paper (# 86R) having a pore diameter of 1 μm was almost completely extracted. This indicates that the polymerized glycidyl acrylate-N-methylmaleimide-divinylbenzene crosslinked copolymer particles are minute.

Comparative Example 1 In 34 L of water, 4 kg of N-phenylmaleimide, 4 kg of glycidyl methacrylate, 1 kg of divinylbenzene,
0.5 L of ethanol, Na-dodecyl sulfonate 16
0 g and di-t-butyl peroxide 48 g,
Polymerization was performed at 60 ° C. for 4 hours to obtain a fine powder having an average particle size of 0.08 μm. The fine powder is sufficiently mixed in advance at a ratio of 7 parts by weight with respect to 100 parts by weight of the polypropylene powder (melt index: 16 g / 10 minutes, no stabilizer), and then 170 to 220 ° C. in a twin-screw extruder. The mixture was heated and melted at the temperature described above and granulated into pellets. The pellets were subjected to melt spinning with the addition of 0.5% by weight of 2,6-di-tert-butyl-4-methylphenol as a stabilizer.
The melt spinning was performed using a spinning machine at 280 ° C., followed by 6-fold stretching at 130 ° C. As a result, there was no clogging of the nozzle, but the frequency of thread breakage was high and the spinnability was poor.

The physical properties of the obtained polypropylene fiber were as follows: denier: 2.0 (g / 9000 m), elongation: 8 (%), tensile strength: 6.0 (g / d), Young's modulus: 49 (g / d) )Met.

The obtained polypropylene fiber contains N-
The phenylmaleimide-glycidyl methacrylate-divinylbenzene crosslinked polymer particles were partially aggregated on the order of several μm. The concentration of the glycidyl group was 0.07 meq / g, and the concentration of the imide group was 0.07 meq / g.

The obtained polypropylene fiber was Kayal
on Polyester REDBL-E, Kaya
lon Polyester EBL-E (all trade names, manufactured by Nippon Kayaku Co., Ltd.), Sumikaron Or
angel SE-B (trade name, Sumitomo Chemical Co., Ltd.)
As a result, Carrier dyeing was carried out, and there was no gloss and uneven dyeing. Further, the dyed yarn was washed with acetone, and coloring of the acetone was observed. The dyeing condition was dull, and the chroma was 10.0, indicating uneven dyeing.

Comparative Example 2 100 parts by weight of a monomer mixture comprising 95% by weight of glycidyl methacrylate and 5% by weight of divinylbenzene were added to
Di-t-butyl peroxide was added at 1.5 parts by weight. The above monomer mixture was mixed with polypropylene powder (melt index 16 g / 10 min, without stabilizer) 1
The mixture was sufficiently mixed in advance at a ratio of 7 parts by weight with respect to 00 parts by weight, then heated and melted at a temperature of 170 to 220 ° C. in a twin-screw extruder, polymerized, and then pelletized. . The pellets were allowed to stand overnight at 70 DEG C. in N2 and then subjected to melt spinning with the addition of 0.5% by weight of 2,6-ditert-butyl-4-methylphenol as a stabilizer. The melt spinning was performed using a spinning machine at 280 ° C., followed by 6-fold stretching at 130 ° C. As a result, it could be carried out without any problems such as thread breakage and nozzle clogging.

The physical properties of the obtained polypropylene fiber were as follows: denier: 1.0 (g / 9000 m), elongation: 28
(%), Tensile strength: 6.3 (g / d), Young's modulus: 53
(G / d).

Glycidyl methacrylate-divinylbenzene crosslinked polymer particles having an average particle diameter of 0.05 μm were dispersed and present in the obtained polypropylene fibers. The glycidyl group concentration was 0.11 meq / g.

The obtained polypropylene fiber was converted to Kayal.
on Polyester REDBL-E, Kaya
lon Polyester EBL-E (all trade names, manufactured by Nippon Kayaku Co., Ltd.), Sumikaron Or
angel SE-B (trade name, Sumitomo Chemical Co., Ltd.)
As a result, Carrier dyeing was performed, and glossy and good dyed yarn was obtained. When the dyed yarn was further washed with acetone, some coloring was observed in acetone, and the saturation was 31.7.
Met.

The pellets of the polypropylene composition before spinning were almost completely extracted as a result of Soxhlet extraction using meta-xylene. This indicates that the polymerized glycidyl methacrylate-divinylbenzene crosslinked copolymer particles are minute.

Comparative Example 3 To 100 parts by weight of a monomer mixture consisting of 95% by weight of N-phenylmaleimide and 5% by weight of divinylbenzene, 1.5 parts by weight of di-t-butyl peroxide was added. The above mixture was sufficiently mixed in advance at a ratio of 7 parts by weight with respect to 100 parts by weight of polypropylene powder (melt index: 16 g / 10 minutes, no stabilizer), and then 170-220 ° C. in a twin-screw extruder. The mixture was heated and melted at the temperature described above and granulated into pellets. The pellets were subjected to melt spinning with the addition of 0.5% by weight of 2,6-di-tert-butyl-4-methylphenol as a stabilizer. The melt spinning was performed using a spinning machine at 280 ° C., followed by 6-fold stretching at 130 ° C. As a result, it could be carried out without any problems such as thread breakage and nozzle clogging.

The physical properties of the obtained polypropylene fiber were as follows: denier: 2.0 (g / 9000 m), elongation: 15 (%), tensile strength: 6.2 (g / d), Young's modulus: 58 (g / d) )Met.

When the obtained polypropylene fiber was observed with a transmission electron microscope, the average particle size was 0.05 μm.
N-phenylmaleimide-divinylbenzene crosslinked polymer particles were present in a dispersed state. The imide group concentration was 0.14 meq / g.

The obtained polypropylene fiber was converted to Kayal.
on Polyester REDBL-E, Kaya
lon Polyester EBL-E (all trade names, manufactured by Nippon Kayaku Co., Ltd.), Sumikaron Or
angel SE-B (trade name, Sumitomo Chemical Co., Ltd.)
As a result, Carrier dyeing was performed, and glossy and good dyed yarn was obtained. Further, even when the dyed yarn was washed with acetone, some coloring was observed in acetone, and the saturation was 35.5.

Claims (2)

(57) [Claims] 1. A polypropylene, 15 to 70% by weight of a vinyl monomer having a glycidyl group, a maleimide monomer 2
0-75% by weight and cross-linked polymer particles obtained by polymerizing a cross-linking agent of 1-10% by weight. The cross-linked polymer particles are finely dispersed in polypropylene as particles having an average particle diameter of 0.01-0.1 μm. Polypropylene fiber comprising a polypropylene composition comprising: 2. A polymer obtained by polymerizing 15 to 70% by weight of a glycidyl group-containing vinyl monomer, 20 to 75% by weight of a maleimide monomer and 1 to 10% by weight of a crosslinking agent in a molten polypropylene. The method for producing a polypropylene fiber according to claim 1, wherein the polypropylene composition according to claim 1 is melt-spun.