JPH0667329B2 - Monofilament for brush - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a monofilament for a brush, which has excellent hair-regulating properties and hair-implanting properties, and a hair brush, for example, can provide stable brush quality as a toothbrush. Is.

(Prior Art) Conventionally, synthetic linear polymers typified by polyamide and polyester have been mainly applied as brush materials for hair brushes, toothbrushes, clothing brushes, etc., but the required performance is diversifying more and more. Recently, in addition to various physical properties as a brush, a material having further improved hair-regulating property and hair-implanting property has been demanded.

That is, when applying a monofilament composed of a synthetic linear polymer for a brush, generally, the monofilament is first converged into a bundle having a diameter of several cm, and the outer periphery is wrapped with a paper tape or the like to maintain its shape, After taping, this is cut into a fixed length of about 1 m to provide a so-called cut bristle product form.
Then, in the brush manufacturing process, it is usual that the cut bristle is further cut into a certain length of about several cm, and after a hair-regulating operation, a fixed number of hairs are planted in a hole of a brush material (handle) by a hair transplanting machine. .

However, in the above hair shaping and hair transplanting work, the conventional monofilaments have a strong workability such as the bundles being disturbed or crumbled when the monofilaments are squeaky and difficult to handle during the hair setting work or cutting work of the cut bristle. However, due to this, the flocking condition after flocking on the brush handle with a flocking machine has a large rate of defective flocking, such as variations in the number of flocked holes per hole and uneven brushing It had the drawback of lacking in quality stability.
In order to improve these problems, a means for applying a smoothing agent or a lubricant consisting of an emulsion or oil agent such as mineral oil, higher alcohol, alkyl phosphate ester salt and dimethylpolysiloxane to the surface of monofilament has been known. However, even with such a method, the hair-regulating property and the hair-implanting property of the monofilament for a brush cannot be satisfied in a balanced manner, and further improvement is desired.

(Problems to be solved by the present invention) Therefore, the present inventors have found that a monofilament for a brush, which has excellent hair-regulating properties and hair-implanting properties, and which can provide stable brush quality as, for example, a hairbrush or a toothbrush. As a result of earnest studies for the purpose of obtaining the above, the inventors have found that the above object can be effectively achieved by applying a specific silicone oil mixture to the surface of the monofilament, and have reached the present invention.

(Means for Solving the Problems) That is, the present invention provides a mixture of 5 to 100 parts by weight of an amino-modified silicone oil with 100 parts by weight of dimethylpolysiloxane on the surface of a monofilament made of a synthetic linear polymer. The present invention provides a monofilament for a brush, which is characterized by being coated.

The synthetic linear polymer used in the present invention means, for example, nylon 6, nylon 66, nylon 610, nylon 612,
Homopolymers or copolymers selected from polyamides such as nylon 11 and nylon 12, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyolefins such as polyethylene and polypropylene, and polyvinylidene chloride such as polyvinylidene chloride and polyvinylidene fluoride. These polymers include antistatic agents, heat resistance agents, light resistance agents, weather resistance agents, lubricants,
Conventional additives such as plasticizers, colorants, dyes and pigments can be included.

The monofilament consisting of the above synthetic linear filaments and the polymer are supplied to a melt spinning machine, and the melt spun yarn is cooled if necessary, and then appropriately stretched, for example, 3 to 8 times. It is manufactured by heat-setting if necessary.

The diameter of the obtained monofilament is 0.05 to 0.08.
It can be arbitrarily selected in the range of mm, and in order to adapt it to the brush application as described above, it is important to be subjected to the coating treatment with the silicone oil mixture described below.

The dimethylpolysiloxane used in the present invention has a structural formula represented by the following formula, and is commercially available, for example, from Toray Silicone Co., Ltd. under the trade name of SH-200.

The amino-modified silicone oil used in the present invention is obtained by substituting a part of the methyl group of dimethylpolysiloxane with an amino group so as to have a structure represented by the following formula. For example, a product of SF8417 from Toray Silicone Co., Ltd. Marketed under the name.

The amino group equivalent of this amino-modified silicone oil is 1,
The range of 000 to 5,000, particularly 1,500 to 3,500 is preferable, and the range of 1,000 or less increases stickiness of the monofilament, and the range of 5,000 or more results in insufficient effect of improving hair transplantability. There are cases.

Here, the amino group equivalent of the modified silicone oil is W /
M [W: weight of amino-modified silicone oil (g), M: number of moles of amino group in amino-modified silicone oil of W (g)].

It is important that the dimethylpolysiloxane and amino-modified silicone oil used in the present invention are used by mixing the former with 100 parts by weight, and the latter with a ratio of 5 to 100 parts by weight, particularly 7 to 70 parts by weight. . When the amount of the amino-modified silicone oil mixed is less than 5 parts by weight, not only the squeaky feeling is increased and the bundle is apt to be disturbed in the hair styling process, but also the effect of improving the hair transplantability is small. However, this is not preferable because the tackiness of the yarn increases and the hair-implanting property deteriorates.

The method of coating the surface of the monofilament with the mixed silicone oil in the present invention includes a method of applying the mixed silicone oil to the surface of the monofilament that has been spin-stretched as an aqueous emulsion using an oiling roller, and a method for coating the tank of the aqueous emulsion of the mixed silicone oil. Examples of the method include a method of directly immersing the monofilament therein and adhering it. In any method, after the emulsion is adhered, the monofilament for a brush of the present invention is obtained by evaporating the aqueous medium, preferably by drying.

The amount of the mixed silicone oil attached to the monofilament is 0.003 to 0.10% by weight, and particularly 0.005 to
0.08% by weight is preferable, and if 0.003% by weight or less, the effect of improving the hair transplantability may be insufficient, and 0.1% by weight or less.
If the amount exceeds 0% by weight, the thread becomes sticky, and the handling state (defibration property) in the hair styling process deteriorates, and the hair transplant state also deteriorates.

(Operation of the invention) The monofilament for a brush of the present invention thus obtained is converged into a bundle having a diameter of several cm, further taped, and then cut into a constant length of about 1 m and cut. In the step of forming bristles and the step of further cutting the bristles to a certain length and styling the hair, there is no squeaky feeling, and there is almost no disorder or collapse of the bundle. When a certain number of the cut bristles are further planted on the brush base material (handle), the defective product rate is significantly reduced, the productivity is improved, and the quality of the brush is significantly improved.

Although the reason why the effect of the present invention is expressed is not clear, by using dimethylpolysiloxane and modified silicone oil mixed in a specific ratio, the conformability of the silicone oil to the monofilament is increased, and the smoothing action and the lubricating action are further improved. It is considered that this is due to the improvement.

The effects of the present invention will be further described with reference to examples.

(Example) Nylon 610 chip (CM2001) manufactured by Toray Industries, Inc. was put in a 40 mm extruder to obtain a polymer temperature of 26
Melt spinning was performed at 0 ° C., and subsequently stretched 4.5 times.
At the time of winding after relaxation heat treatment, a 0.2% by weight aqueous emulsion of a mixed silicone oil obtained by mixing dimethylpolysiloxane and an amino-modified silicone oil having an amino group equivalent of 2000 at a mixing ratio shown in Table 1 was used. The monofilament was coated by the oiling roller installed in front of the above so as to have the predetermined adhesion amounts shown in Table 1.

The monofilaments with a diameter of 0.21 mm thus obtained were then bundled into a bundle with a diameter of 50 mm, taped with a taping machine, and then cut into a length of 30 mm to obtain cut bristles.

The cut bristles were disentangled by hand, and the tape was peeled off to sufficiently adjust the hair, and then the hair was subjected to the following flocking work.

That is, a cut bristle having a length of 30 mm was cut into an AS resin toothbrush handle by using a flocking machine to form a 1.5 mm
A toothbrush was prepared by implanting 18 hairs in each of the 18 holes and 38 holes.

Table 1 also shows the evaluation results of the hair styling property and the hair transplanting property during the above hair styling and hair transplanting work.

The hair transplantability and the hair transplantability were evaluated according to the following criteria.

A. A squeaky feeling: When holding hands while holding a bunch of cut bristle cut to a length of 30 mm
No squeaking at all Δ-Slightly squeaking is present × -Squeaking is extremely strong B. Disturbance of the bundle …… When holding the bundle of cut bristle cut to a length of 30 mm with both hands and doing the rubbing,
The bundle is not disturbed at all Δ: There is a slight disturbance of the bundle ×: The bundle is disturbed and the bundle is broken C. Stickiness: A bunch of cut bristle cut to a length of 200 mm is left for more than 24 hours, then unwound the paper tape half way, and feels when the monofilament is directly grabbed by hand, or when the bundle is defibrated by hand. The non-greasy non-greasy spread is extremely good. △ -Almost non-greasy spread is good. X-Slightly sticky and slightly covered D. Percentage of defective flocking (%) After flocking the cut bristles on the handle of the toothbrush as described above, the number of flocked holes per hole is outside the standard of 18 ± 1 and the number of flickers is large, and uneven brushing occurs. The total number of recognized brushes is the total number of hair transplants (400
Book).

As is clear from the results shown in Table-1, the monofilaments for brushes of the present invention (Nos. 1 to 4) have improved hair-regulating properties and hair-implanting properties as compared with the case where silicone oil is not coated (No. 9). It has been improved, and the characteristics of both have been balanced.

On the other hand, when the amount of the amino-modified silicone oil mixed is small (No. 5) or not mixed (No. 7), the effects of improving the squeak, turbulence and flocking property of the bundle are not recognized. Further, when the amount of the amino-modified silicone oil mixed is too large (No. 6) or when only the amino-modified silicone oil is used (No. 8), the tackiness remains slightly problematic, and the hair transplantability is improved as compared with the present invention. The effect is small.

(Effects of the Invention) As described above, the brush monofilament of the present invention has no squeaky feeling and is easy to handle in the hair styling process, and the bundle is hardly disturbed or crumbled. Further, the monofilament for a brush of the present invention significantly reduces the defective product generation rate during hair transplantation, improves productivity, and significantly improves the quality of the obtained brush. Thus, the monofilament for a brush of the present invention has excellent hair-regulating properties and hair-implanting properties, and is expected to be applied to general brush applications such as toothbrushes, hairbrushes and clothing brushes.

Claims (1)

[Claims] 1. A brush comprising a monofilament made of a synthetic linear polymer coated with a mixture of 100 parts by weight of dimethylpolysiloxane and 5 to 100 parts by weight of amino-modified silicone oil. For monofilament.