ARTIFICIAL HAIR FIBER

Abstract

An artificial hair fiber is superior in productivity and flame retardance, and is suppressed in color unevenness. An artificial hair fiber, including polyamide; and 5 to 40 parts by mass of bromine flame retardant and 0.01 to 10 parts by mass of pigment processing pigment with respect to 100 parts by mass of the polyamide; wherein the pigment processing pigment includes a colorant and a dispersant; the dispersant is contained by 20 to 80 mass % with respect to 100 mass % of total amount of the colorant and the dispersant; the dispersant includes one or more selected from the group consisting of montanoic acid metallic salt, montanoic acid wax, polyethylene wax, and fluorine wax, is provided.

Claims

1. An artificial hair fiber, comprising: polyamide; and 5 to 40 parts by mass of bromine flame retardant and 0.01 to 10 parts by mass of pigment processing pigment with respect to 100 parts by mass of the polyamide; wherein the pigment processing pigment comprises a colorant and a dispersant; the dispersant is contained by 20 to 80 mass % with respect to 100 mass % of total amount of the colorant and the dispersant; the dispersant comprises one or more selected from the group consisting of montanoic acid metallic salt, montanoic acid wax, polyethylene wax, and fluorine wax.

2. The artificial hair fiber of claim 1, wherein the dispersant comprises the montanoic acid metallic salt.

3. The artificial hair fiber of claim 2, wherein the montanoic acid metallic salt is calcium montanate.

4. The artificial hair fiber of claim 1, wherein the colorant comprises at least one selected from the group consisting of Pigment Black 7, Pigment Red 149, Pigment Yellow 147, Solvent Yellow 163, and Pigment Violet 19.

Description

EXAMPLES

[0040] Examples of the artificial hair fiber according to the present invention will be described in detail by comparing with the Comparative Examples. Further, the present invention will be described in more detail based on the Examples, however, the present invention is not limited to these Examples.

[0041] Polyamide dried so as to have a moisture content of less than 1000 ppm, flame retardant, and processing pigment were blended so as to have a blending ratio of Examples and Comparative Examples shown in Table 1 to Table 4. The blended material was kneaded using a twin-screw extruder having ϕ 30 mm, thereby obtaining raw material pellets for spinning.

[0042] Subsequently, the pellets were dehumidified and dried so as to have a moisture content of less than 1000 ppm, and then the pellets were spun using a single-screw melt spinning machine having ϕ 40 mm. The molten resin discharged from the die having a hole diameter of 0.5 mm was cooled by allowing the resin to go through a water tank of approximately 30° C. The jetting amount and the winding speed were adjusted so as to obtain undrawn fiber having a desired fineness. The melt spinning machine was constituted by arranging the screw, the wire mesh filter, and the die in this order. The pellets were heated and melt by the screw to give a molten resin composition, and then the molten resin composition was filtered through the filter, followed by discharging from the die. The temperature of the die was set to 290° C.

[0043] The undrawn fiber thus obtained was drawn at 100° C., followed by annealing at 150 to 200° C., thereby obtaining artificial hair fiber having a desired fineness. The drawing magnitude was 3 times, and the relaxation rate during annealing was 0.5 to 3%. The relaxation rate during annealing is a value obtained by (rotation speed of winding roller during annealing)/(rotation speed of feeding roller during annealing).

[0044] The artificial hair fiber thus obtained was evaluated for color unevenness, transparency (clarity), flame retardance, thread breakage resistance, and long-running performance, in accordance with the evaluation method and criteria described herein. The results are shown in Table 1 to Table 4.

TABLE-US-00001 TABLE 1 Example Comparative Example Table 1 unit 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 formu- polyamide polyamide parts 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 lation 66 by mass polyamide parts 100 6 by mass flame brominated parts 15 15 15 15 15 15 15 15 15 15 5 40 15 15 15 15 15 15 retardant epoxy by mass processing pigment parts 1 1 1 1 1 1 1 1 1 1 1 1 0.01 10 1 1 1 1 by mass dispersant calcium mass % 30 50 70 50 50 30 30 30 30 15 85 montanate zinc mass % 50 montanate sodium mass % 50 montanate montanoic mass % 50 acid ester wax polyethylene mass % 50 wax montanoic mass % 50 acid wax/ fluorine wax blended 50 product calcium mass % 50 stearate calcium mass % 12- hydroxy- stearate colorant Pigment mass % 70 50 30 50 50 50 50 50 50 70 70 70 70 50 50 85 15 Black 7 Solvent mass % 50 Black 7 evalu- color unevenness — A A A B B B B B A A A A A A B A A A ation transparency — A A A A A A A A A A A A A A A A A A result flame retardance — A A A A A A A A B A A A A A A A A A work- thread — A A A A A B B B A A A A A A C C A C ability breakage resistance long-running — A A A A A A A A A A A A A A A A C A performance

TABLE-US-00002 TABLE 2 Example Comparative Example Table 2 unit 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 5 6 7 8 formu- polyamide polyamide parts 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 lation 66 by mass polyamide parts 100 6 by mass flame brominated parts 15 15 15 15 15 15 15 15 15 15 15 5 40 15 15 15 15 15 15 retardant epoxy by mass processing pigment parts 1 1 1 1 1 1 1 1 1 1 1 1 1 0.01 10 1 1 1 1 by mass dispersant calcium mass % 30 50 70 50 50 50 30 30 30 30 15 85 montanate zinc mass % 50 montanate sodium mass % 50 montanate montanoic mass % 50 acid ester wax polyethylene mass % 50 wax montanoic mass % 50 acid wax/ fluorine wax blended 50 product calcium mass % 50 stearate calcium mass % 12 hydroxy- stearate colorant Pigment mass % 70 50 30 50 50 50 50 50 50 70 70 70 70 50 50 85 15 Red 149 Pigment mass % 50 Red 177 Solvent mass % 50 Red 179 evalu- color unevenness — A A A B B B B B A A A A A A A B A A A ation transparency — A A A A A A A A A A A A A A A A A A A result flame retardance — A A A A A A A A B B A A A A A A A A A work- thread — A A A A A B B B A A A A A A A C C A C ability breakage resistance long-running — A A A A A A A A A A A A A A A A A C A performance

TABLE-US-00003 TABLE 3 Example Comparative Example Table 3 unit 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 9 10 11 12 formu- polyamide polyamide parts 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 lation 66 by mass polyamide parts 100 6 by mass flame brominated parts 15 15 15 15 15 15 15 15 15 15 15 15 5 40 15 15 15 15 15 15 retardant epoxy by mass processing pigment parts 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0.01 10 1 1 1 1 by mass dispersant calcium mass % 30 50 70 50 50 50 50 30 30 30 30 15 85 montanate zinc mass % 50 montanate sodium mass % 50 montanate montanoic mass % 50 acid ester wax poly- mass % 50 ethylene wax montanoic mass % 50 acid wax/ fluorine wax blended product calcium mass % 50 stearate calcium mass % 50 12- hydroxy- stearate colorant Pigment mass % 70 50 30 50 50 50 50 50 50 70 70 70 70 50 50 85 15 Yellow 147 Solvent mass % 50 Yellow 163 Solvent mass % 50 Yellow 21 Pigment mass % 50 Yellow 184 evalu- color unevenness — A A A B B B B B A A A A A A A A B A A A ation transparency — A A A A A A A A A A A A A A A A A A A A result flame retardance — A A A A A A A A A B B A A A A A A A A A work- thread — A A A A A B B B A A A A A A A A C C A C ability breakage resistance long- — A A A A A A A A A A A A A A A A A A C A running perform- ance

TABLE-US-00004 TABLE 4 Example Comparative Example Table 4 unit 46 47 48 49 50 51 52 53 54 55 56 57 58 59 13 14 15 16 formu- polyamide polyamide parts 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 lation 66 by mass polyamide parts 100 6 by mass flame brominated parts 15 15 15 15 15 15 15 15 15 15 5 40 15 15 15 15 15 15 retardant epoxy by mass processing pigment parts 1 1 1 1 1 1 1 1 1 1 1 1 0.01 10 1 1 1 1 by mass dispersant calcium mass % 30 50 70 50 50 30 30 30 30 15 85 montanate zinc mass % 50 montanate sodium mass % 50 montanate montanoic mass % 50 acid ester wax polyethylene mass % 50 wax montanoic mass % 50 acid wax/ fluorine wax blended product calcium mass % stearate calcium mass % 50 12- hydroxy- stearate colorant Pigment mass % 70 50 30 50 50 50 50 50 50 70 70 70 70 50 50 85 15 Violet 19 Pigment mass % 50 Violet 29 evalu- color unevenness — A A A B B B B B A A A A A A B A A A ation transparency — A A A A A A A A A A A A A A A A A A result flame retardance — A A A A A A A A B A A A A A A A A A work- thread — A A A A A B B B A A A A A A C C A C ability breakage resistance long-running — A A A A A A A A A A A A A A A A C A performance

[0045] As the materials mentioned in Table 1 to Table 4, the followings were used.

[0046] polyamide 66 (weight average molecular weight 90000, available from Du Pont, Zytel 42A)

[0047] polyamide 6 (weight average molecular weight 90000, available from Denka Company Limited)

[0048] brominated epoxy (available from Sakamoto Yakuhin Kogyo Co., Ltd., SRT-20000)

[0049] calcium montanate (available from NITTO KASEI KOGYO K.K.)

[0050] zinc montanate (available from NITTO KASEI KOGYO K.K.)

[0051] sodium montanate (available from NITTO KASEI KOGYO K.K.)

[0052] montanoic acid ester wax (available from Clariant Japan K. K., Licowax E)

[0053] polyethylene wax (available from Clariant Japan K. K., Licowax PE520)

[0054] montanoic acid wax/fluorine wax blended product (available from Clariant Japan K. K., WaxCompositeG431L)

[0055] calcium stearate (available from NITTO KASEI KOGYO K.K.)

[0056] calcium 12-hydroxystearate (available from NITTO KASEI KOGYO K. K.)

[0057] Pigment Black 7 (available from Denka Company Limited)

[0058] Solvent Black 7 (available from Orient Chemical Industries Co., Ltd.)

[0059] Pigment Red 149 (available from Clariant Japan K. K.,)

[0060] Pigment Red 177 (available from BASF SE)

[0061] Solvent Red 179 (available from Orient Chemical Industries Co., Ltd.)

[0062] Pigment Yellow 147 (available from BASF SE)

[0063] Solvent Yellow 163 (available from BASF SE)

[0064] Solvent Yellow 21 (available from Orient Chemical Industries Co., Ltd.)

[0065] Pigment Yellow 184 (available from BASF SE)

[0066] Pigment Violet 19 (available from BASF SE)

[0067] Pigment Violet 29 (available from BASF SE)

[0068] The evaluation method and criteria for each of the evaluation items in Table 1 to Table 4 are as follows.

<Color Unevenness>

[0069] The color unevenness was evaluated by using samples prepared with artificial hair fiber of Examples and Comparative Examples bundled to have 200 mm length and 1.0 g weight. The samples were evaluated by artificial hair fiber engineers (5 or more years of experience) by visual observation in accordance with the following criteria.

[0070] A : No color unevenness observed.

[0071] B : Scarce color unevenness observed, no problem for usage as artificial hair fiber.

[0072] C : Apparent color unevenness observed at a glance, cannot be used as artificial hair fiber.

<Transparency (Clarity)>

[0073] The transparency (clarity) was evaluated by using samples prepared with artificial hair fiber of Examples and Comparative Examples bundled to have 200 mm length and 1.0 g weight. The samples were evaluated by artificial hair fiber engineers (5 or more years of experience) by visual observation in comparison with human hair, in accordance with the following criteria.

[0074] A: Transparency (clarity) similar to human hair observed.

[0075] B: Difference observed when compared with human hair, however, transparency (clarity) close to human hair observed in general.

[0076] C: Apparent cloudiness observed at a glance, difference from human hair observed.

<Flame Retardance>

[0077] The flame retardance was evaluated by using samples prepared as follows. Artificial hair fiber were cut into a length of 30cm, thereby preparing a fiber bundle sample having a weight of 2g containing a number of fibers. One end of the fiber bundle was fixed to allow the fiber bundle to hang vertically, and the lower end was allowed to contact with a flame having a length of 20mm for 5 seconds. The flame propagation period after taking away the flame was measured. Evaluation was performed with the following criteria. The results are shown as the average of three measurement results.

[0078] A: Flame propagation period was less than 5 seconds.

[0079] B: Flame propagation period was 5 seconds or more and less than 10 seconds.

[0080] C: Flame propagation period was 10 seconds or more.

<Thread Breakage Resistance>

[0081] The thread breakage resistance was evaluated as follows. Occurrence of thread breakage was visually observed during melt spinning until the undrawn fiber was obtained. Evaluation was made in accordance with the following criteria.

[0082] A: Time of thread breakage was 1 time or less/1 hour.

[0083] B: Time of thread breakage was 2 to 3 times/1 hour.

[0084] C: Time of thread breakage was 4 times or more/1 hour.

<Long-Running Performance>

[0085] The long-running performance was evaluated by the time spinning can be performed continuously without changing the filter.

[0086] A: 48 hours or longer

[0087] B: 24 to 48 hours

[0088] C: less than 24 hours

<Discussion>

[0089] All of the Examples showed evaluation result of A or B in all of the evaluation items of color unevenness, transparency (clarity), flame retardance, thread breakage resistance, and long-running performance.

[0090] On the other hand, all of the Comparative Examples showed evaluation result of C in at least one of the evaluation items. In particular, in Comparative Examples of 1 to 2, 5 to 6, 9 to 10, and 13 to 14, in which the dispersant other than montanoic acid metallic salt was used, the thread breakage resistance was not superior. Further, in Comparative Examples 3, 7, 11, and 15 in which the ratio of dispersant was too small, the long-running performance was not superior. In Comparative Examples 4, 8, 12, and 16 in which the ratio of dispersant was too large, the thread breakage resistance was not superior.

[0091] Among the Examples, when montanoic acid metallic salt was used as the dispersant, the thread breakage resistance was especially superior compared to cases where a substance other than the montanoic acid metallic salt was used as the dispersant. Further, when calcium montanate was used, the color unevenness was especially small compared to cases where a substance other than the calcium montanate was used.

[0092] Further, regarding the black colorant, the flame retardance was superior when Pigment Black 7 was used. Regarding the red colorant, the flame retardance was superior when Pigment Red 149 was used. Regarding the yellow colorant, the flame retardance was superior when Pigment Yellow 147 or Solvent Yellow 163 was used. Regarding the purple colorant, the flame retardance was superior when Pigment Violet 19 was used.