JPH01148806A - Acrylic synthetic fiber for wig - Google Patents

Abstract

PURPOSE:To provide the title fiber derived from a polymer containing specific amounts of acrylonitrile component and halogen-containing monomer component, having a specific shrinkage-initiation temperature, able to be curled with conventional thermal device for beauty art and having excellent shape-retainability. CONSTITUTION:The objective acrylic synthetic fiber for wig having a shrinkage- initiation temperature of 140-200 deg.C, preferably 140-190 deg.C is derived from a copolymer of (A) 50-70wt.%, preferably 50-60wt.% of acrylonitrile component and (B) 25-50wt.% of a halogen-containing monomer copolymerizable with acrylonitrile (the sum of the acrylonitrile component and the halogen- containing monomer component is >=90wt.% of the whole polymer).

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to heat-resistant materials used in hair-like parts of wigs, hairpieces, doll hair, toys and accessories other than dolls, etc. Concerning excellent acrylic synthetic fibers for hair.

C. Prior Art/Problems to be Solved by the Invention] Synthetic fibers commonly used for hair include modacrylic fibers, vinyl chloride fibers, and vinylidene chloride fibers.

These fibers have low heat resistance, so although heat setting such as curling can be easily done at low temperatures, the curl form tends to be damaged while being used, so heat setting must be repeated to recurl. Accordingly, the fibers become sore,
It becomes difficult to set up afterwards. In addition, the shape of the curls can easily be lost and the original performance of the hair can be maintained by using it under moist heat or dry heat in a shower, bath, sauna, etc., washing the hair in a hot water bath, drying it with a hair dryer, or brushing it. The problem is that it is difficult. Furthermore, when imparting shapes such as curls, the heat resistance is low, so the temperature at which the shape is maintained is at most 100 to 1
The temperature limit is 10℃; at temperatures higher than this, the fibers themselves will shrink, and creating curls requires special care and special equipment, making it impossible to use hair dryers or curling irons that are commonly used in beauty salons. Have difficulty.

On the other hand, in order to solve these problems, a method for manufacturing synthetic fibers for hair by chemically and mechanically roughening the surfaces of nylon fibers and polyester fibers and improving the metallic luster of these fibers was proposed in Japanese Patent Application Laid-Open No. 81-245301, JP 82-156308, JP 62-156309
It is disclosed in the publication number etc.

However, although these synthetic fibers have high heat resistance due to the high crystallinity of the material themselves, they are rigid and have inferior beauty properties that are important for hair fibers (for example, the curl form is tight, making it difficult to style). The improvement of metallic luster through surface roughening treatment is not as good as the natural luster of natural hair, and it is also difficult to control the roughening, making it difficult to comb. It cannot be said that it has sufficient properties as a hair fiber.

[Means for Solving the Problems] The present invention solves the problems of the synthetic fibers for hair that have been considered in the past, and does not require any special equipment for curling, and can be applied to hair using ordinary beauty heating equipment. Can give curls,
This was developed to provide an acrylic synthetic fiber for hair that has good curl shape retention even under dry heat or wet heat, and contains an acrylonitrile component of 50 to 70% (wt%, same hereinafter) and acrylonitrile. It is made of a polymer containing 25 to 50% of a polymerizable halogen-containing monomer component, in which the total amount of the acrylonitrile component and the halogen-containing monomer component is 90% or more of the polymer, and the fiber shrinkage onset temperature (T0 ) is 140 to 200°C.

[Example] The acrylic synthetic fiber for hair of the present invention is an acrylic synthetic fiber used for hair-like parts of wigs, hairpieces, doll hair, toys and accessories other than dolls, and the like.

The acrylic synthetic fiber of the present invention is made of a copolymer containing 50 to 70% acrylonitrile component and 25 to 5026 halogen-containing monomer components copolymerizable with acrylonitrile.

When the content of the acrylonitrile component is less than 50%, heat resistance becomes insufficient and problems arise in shape retention. Further, it becomes difficult to perform a restyling operation using a cosmetic heating device, and it becomes impossible to sufficiently maintain the properties necessary for hair fibers. - On the other hand, if it exceeds 70%, the shape retention of curls is good, but problems tend to occur in the cosmetic properties necessary for hair fibers, particularly in the ease of styling and combability. In addition, the content of acrylonitrile component is 50~
It is more preferable that the content is 65%, especially when the content is 50%.
~60% is preferred.

In addition, when the halogen-containing monomer component is 25 to 50%, hair fibers made from a polymer mainly composed of acrylonitrile and a halogen-containing monomer, for example, can improve curl shape retention and style. It has excellent beauty properties such as arrangeability and combability, and flame retardancy, but if the proportion is less than 25%, the flame retardance tends to be insufficient. Incidentally, flame retardancy is a desired performance since hair fibers are worn on the body or kept close at hand as ornaments. On the other hand, if the ratio exceeds 50%, the flame retardance will improve, but the heat resistance required for curling and shape retention will not be sufficient.

Specific examples of the halogen-containing monomer include, but are not limited to, vinyl chloride, vinylidene chloride, vinyl bromide, and vinylidene bromide. These may be used alone or in combination of two or more.

The polymer containing acrylonitrile and a halogen-containing monomer as main components may contain other copolymerizable monomer components within a range of 10% or less. Specific examples of such other monomers include acrylic acid, methacrylic acid, esters thereof, acrylamide, methacrylamide, vinyl acetate, allylsulfonic acid, methallylsulfonic acid, styrenesulfonic acid, 2-acrylamide- Examples include 2-methylpropanesulfonic acid and salts thereof.

The heat resistance of the fiber of the present invention having the above-mentioned materials is such that the shrinkage start temperature (T0) of the fiber is in the range of 140 to 200°C, preferably 140 to 190°C. For reference, the 10% contraction temperature (Tl0) of these fibers is 1
The value is in the range of 55-210°C.

The reason why the shrinkage start temperature (T0) of the acrylic synthetic fiber of the present invention is defined as 140 to 200°C is because fibers at temperatures below these temperatures can be easily heat-set for curling at low temperatures. , the shape of the curl is easily damaged over time or by shampooing, etc., it is difficult to control the temperature during post-setting to re-curl, and the fibers become damaged with repeated setting, making post-setting impossible in a short period of time. This is to prevent this from happening. In addition, the shape of the curls can easily be lost and the style of the hair can be maintained by using it under moist or dry heat in a shower, bath, sauna, etc., washing it in a hot water bath, drying it with a hair dryer, or brushing it. This is because it is difficult. Furthermore, fibers that exceed these temperatures have improved heat resistance but increased stiffness, and when used as hair, have poor styling ability and combability.

The contraction start temperature (T0) and the 10% contraction temperature (Tl
0) means that a load of 0.81 g/denier (d) is applied to the fiber and the length of the shrinkage of the fiber is continuously measured when the temperature is raised at a rate of 3°C/min, and the fiber starts to shrink. The temperature (tangential method) to be T. The temperature when S shows a shrinkage rate of 10% is T
10.

There are no particular limitations on the cross-sectional shape of the fibers of the present invention, such as circular,
An elliptical shape, a horseshoe shape, an irregular cross section, or a mixture of these can be used depending on the purpose. Also 20-70
Fibers with d1, preferably 40 to 55 d, can be suitably used in the present invention.

Next, a method for producing an acrylonitrile polymer constituting the fiber of the present invention and a method for producing fiber from the polymer will be explained.

The polymer constituting the fiber of the present invention can be obtained by polymerizing the aforementioned monomers in a predetermined ratio in an aqueous medium or an organic solvent by a conventional method such as an emulsion polymerization method, a suspension polymerization method, or a solution polymerization method. Manufactured by.

The acrylic polymer obtained in this way has the above-mentioned good heat resistance, and as a result, has good curl shape retention, and has excellent beauty properties such as style arrangement and combability. Examples of methods for producing excellent fibers include conventional wet spinning, dry spinning, semi-dry and semi-wet spinning, and any of these methods may be used, but wet spinning is particularly preferred.

The solvent for preparing the spinning dope is acetonitrile, acetone, which is a usual solvent for acrylonitrile polymers,
Dimethylformamide, dimethylacetamide, dimethylsulfoxide, etc. are used.

The polymer concentration in the spinning dope is preferably 15 to 40%.

In addition, the spinning stock solution or the polymerization system of the solution polymerization method may contain stabilizers such as epoxy compounds, organic tin compounds, organic reducing agents, inorganic acids, organic acids, etc., as well as agents to improve texture and gloss. There is no problem in including additives such as titanium compounds and aluminum compounds, and also flame retardants such as antimony compounds, tin compounds, chlorine compounds, bromine compounds, and phosphorus compounds to further improve flame retardancy.

As for the spinning method, the spinning stock solution is passed through a nozzle to
The conventional spinning method is to extrude into an aqueous solution or hot air containing 50% solvent to form a thread, then wash with water, stretch and dry, then further stretch as necessary, and then heat treat. Just take it.

The fiber of the present invention obtained in this way has excellent heat resistance, but also has excellent styling flexibility.
It also has good combability (it can be used to make wigs with excellent beauty properties).

EXAMPLES Hereinafter, the fibers of the present invention will be explained in more detail based on Examples, but the present invention is not limited to these Examples.

The curl retention properties in the examples were measured by winding the fibers around a pipe with a diameter of 18 mm and heat setting the sample in an oven at 120°C for 40 minutes to make a wig.
The curl growth was observed after being left in hot air at 50°C and hot water at 50°C for 30 minutes.

Example 1 An acrylic polymer consisting of 54% acrylonitrile, 35% vinylidene chloride, 9% vinyl bromide, and 2% sodium methallylsulfonate was dissolved in dimethylformamide to give 30%
% spinning stock solution was prepared, wet-spun in a 60% dimethylformamide aqueous solution, then washed with water, stretched, and dried, further stretched 2.5 times in hot air at 140°C, and then in steam at 120°C. A 20% relaxation heat treatment was performed.

The 50 d acrylic synthetic fiber obtained in this way has a shrinkage start temperature (T0) of 175°C and a 10% shrinkage temperature (T
l0) was 186°C.

When the curl retention of this fiber was measured, there was almost no curl elongation. In addition, the wigs were easy to style and had good beauty properties such as combability.

When we tested the resulting wig in a sauna, the curls held their shape without stretching.
After washing the hair with warm water at 40°C, it remained in its original shape without any problems even when dried with a hair dryer.

The results are shown in Table 1.

Example 2 A small amount of an organotin compound was added as a stabilizer to an acrylic polymer consisting of 52% acrylonitrile, 47% vinylidene chloride, and 1% sodium styrene sulfonate, and the mixture was dissolved in acetone to prepare a 28% spinning stock solution. did. This stock solution was wet-spun in a 25% acetone aqueous solution, then washed with water.
After stretching and drying, the film was further stretched to 3.0 in hot air at 120°C.
After stretching the film to double its original size, a relaxation heat treatment was performed at 160°C.

The 45d acrylic synthetic fiber thus obtained had a T of 163°C and a T10 of 178°C.

When the curl retention of this fiber was measured, there was almost no curl elongation. The cosmetic properties of the wig were also good. We made a wig using this fiber and examined the curl form, and found that it was possible to create curls even at high temperatures of 140 to 150 degrees Celsius, and that the curls were reset well, and could be set and reset using a commercially available hair dryer. It was quite possible.

Comparative Example 1 A copolymer consisting of 46% acrylonitrile, 53% vinylidene chloride, and 1% sodium methallylsulfonate was spun, drawn, and heat-treated for relaxation in the same manner as in Example 2 to produce an acrylic synthetic fiber.

This fiber has a low T of 137℃ and T10 of 149℃.
The cosmetic properties evaluated in the same manner as in Example 1 were good, but the curl retention was poor.

The results are shown in Table 1.

Comparative Example 2 An acrylic polymer consisting of 73% acrylonitrile, 23% vinyl chloride, 3% methyl acrylate, and 196 sodium methallylsulfonate was spun, stretched, and relaxed with steam in the same manner as in Example 1 to produce an acrylic synthetic fiber. I got it.

This fiber had excellent heat resistance with a To of 186°C and a T10 of 202°C, and the curl retention evaluated in the same manner as in Example 1 was also good, but the combability was poor and the style arrangement was poor. , the cosmetic properties were not good. The results are shown in Table 1.

Example 3 An acrylic polymer consisting of 63% acrylonitrile, 25% vinylidene chloride, 10% vinyl chloride, 1% sodium styrene sulfonate, and 1% polyethylene glycol monomethacrylate was spun, stretched, and relaxed with steam in the same manner as in Example 1. The process was carried out to produce acrylic synthetic fibers.

The fiber had excellent heat resistance, T of 188°C, and T of 10 of 199°C, as well as good curl retention and cosmetic properties.The results are shown in Table 1.

The manufactured wig was worn for one month at the sea in midsummer, and the curl retention was good, and no change was observed in the shape of the wig even when it was dried with a hair dryer after a shower.

Comparative Examples 3-4 T using commercially available modacrylic fibers and vinyl chloride fibers (Comparative Examples 3 and 4, respectively). , T10' curl retention, and beauty properties were measured in the same manner as in Example 1.
As shown in the table, the properties other than cosmetic properties were inferior.

Example 4 An acrylic polymer consisting of acrylonitrile 6996, 27% vinylidene chloride, 2% methyl acrylate, and 2% sodium 2-acrylamido-2-methylpropanesulfonate was spun, stretched, and relaxed with steam in the same manner as in Example 1. The process was carried out to produce acrylic synthetic fibers.

T of this fiber. had excellent heat resistance of 191"c and 204°C for Tlo, and had good curl retention, but the combability and style arrangement were somewhat poor.

[Margins below] [Effects of the Invention] When the fibers of the present invention are used to manufacture hair-like parts of wigs, hairpieces, doll hair, toys other than dolls, ornaments, etc., the fibers of the present invention can be used in general beauty salons. Curls can be easily formed using common tools such as hair dryers and curling irons, and the curls retain their shape well even under high-temperature dry heat or moist heat.

If the heat resistance is too high, it will be difficult to perform post-setting such as re-curling using a normal beauty heating device, but the fiber of the present invention has the advantage that it can be post-setting using a normal cosmetic heating device.

Moreover, the cosmetic properties of the wig are also improved.

Patent applicant Kanebuchi Chemical Industry Co., Ltd.

Claims (1)

[Claims] 1 Acrylonitrile component 50 to 70% by weight and halogen-containing monomer component copolymerizable with acrylonitrile 2
5 to 50% by weight, and the total amount of the acrylonitrile component and the halogen-containing monomer component is 90% by weight or more of the polymer, and the fiber shrinkage start temperature (T_0)
An acrylic synthetic fiber for hair having a temperature of 140 to 200°C.