JPS6257514A - Monofilament for brush - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a monofilament for brushes 1 which exhibits excellent hair styling and flocking workability and which can provide stable brush quality for use as, for example, hair brushes and toothbrushes. It is related to ~.

(Prior art) Synthetic linear polymers, such as polyamide and polyester, have traditionally been mainly used as brush materials for hairbrushes, toothbrushes, clothing brushes, etc., but the required performance is becoming increasingly diverse. Recently, there has been a demand for materials that not only have various physical properties for brushes but also have improved hair styling and hair transplanting workability.

In other words, when monofilaments made of synthetic linear polymers are applied to brushes, the monofilaments are generally first converged into a bundle several centimeters in diameter, and the outer circumference is wrapped with paper tape or the like to maintain the shape. After this, it is cut into a constant length of about 1 m and provided in the form of a so-called cut bristle product. In the brush manufacturing process, this cut bristle is usually further cut into a certain length of several centimeters, and after hair styling, a certain number of bristles are implanted into the holes of the brush base material (handle) using a flocking machine. be.

However, in the above-mentioned hair styling and hair transplanting operations, conventional monofilaments are difficult to handle, causing the monofilaments to squeak against each other during hair styling and cutting operations for cut bristle, causing the bundle to become disordered or fall apart. There are problems in terms of workability, such as hair transplantation, and due to this, the condition of the transplanted hair after transplanting with the brush handle is also poor, such as uneven number of flocks per hole and irregularities in the hair transplantation, etc. The problem was that the brush quality was not stable.

Conventionally, in order to improve these problems, it has been known to apply a smoothing agent or lubricant consisting of an emulsion or oil agent such as mineral oil, higher alcohol, alkyl phosphate ester salt, and dimethylpolysiloxane to the surface of the monofilament. Even with such a method, the workability of hair styling and flocking of monofilaments for brushes is still insufficient, and the reality is that further improvements are desired.

(Problems to be Solved by the Present Invention) Therefore, the present inventors have developed a monofilament for brushes that exhibits excellent hair styling and flocking workability and can provide stable brush quality for use as hair brushes and toothbrushes, for example. As a result of intensive studies aimed at obtaining the desired results, it was discovered that the above object could be effectively achieved by selecting a specific silicone oil as a compound to be applied to the surface of the monofilament, and the present invention was achieved.

(Means for Solving the Problems) That is, the present invention provides a monofilament for a brush, characterized in that the surface of the monofilament made of a synthetic linear polymer is coated with amino-modified silicone oil. .

The synthetic linear polymers used in the present invention include, for example, nylon 6, nylon 66, nylon 6101, 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 halides such as polyvinylidene chloride and polyvinylidene fluoride. These polymers contain 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 made of the synthetic linear polymer is produced by feeding the polymer into a melt-spinning machine, cooling the melt-spun spun yarn as necessary, and then drawing it at an appropriate magnification, for example, 3 to 8 times. Manufactured by heat setting if necessary.

The diameter of the obtained monofilament is 0.05-0.80
m can be arbitrarily selected within the range, and in order to apply it to the above-mentioned brush use, it is important to subject it to coating treatment with modified silicone oil as described below.

The modified silicone oil used in the present invention is a dimethylpolysiloxane in which part of the methyl group is substituted with an amino group so as to have grooves as shown in the following formula. It is commercially available at.

H2 (R is an alkylene group) The amino group equivalent of this amino-modified silicone oil is 1.000 to 5,000. Especially 1.500~3.5
A value in the range of 00 is preferable; if it is less than 1.000, the monofilament becomes sticky, and if it is more than 5,000, the effect of improving flocking properties may be insufficient.

Here, the amino group equivalent of the modified silicone oil is W/
M [W weight of near-amino modified silicone oil (
Q), M:W is a value defined by (the number of moles of amino groups in the amino-modified silicone oil of CI>).

In the present invention, the method of coating the surface of a monofilament with amino-modified silicone oil includes a method of applying the modified silicone oil as an aqueous emulsion to the surface of the spun and drawn monofilament using an oiling roller, and a method of applying the modified silicone oil as an aqueous emulsion to the surface of the spun and drawn monofilament using an oiling roller, and a method of applying the modified silicone oil as an aqueous emulsion to the surface of the monofilament that has been spun and drawn using an oiling roller. (Immerse the monofilament directly into the bath)
In either method, the monofilament for a brush of the present invention can be obtained by depositing the emulsion and then evaporating the aqueous medium, preferably by drying.

The amount of amino-modified silicone oil attached to the monofilament is preferably 0.003 to 0.10% by weight, particularly 0.005 to 0.08% by weight, and 0.003% by weight.
If it is less than 0.1% by weight, the effect of improving hair flocking properties may be insufficient, and if it exceeds 0.10% by weight, the yarn will become sticky and sticky.
Not only will the cutting condition (fibrillation ability) in the hair styling process deteriorate, but the hair transplanting condition may also deteriorate.

(Operation of the invention) The monofilament for a brush of the present invention obtained in this way is collected into a bundle with a diameter of several cm, roughly taped, and then cut into a constant length of about 1 m. There is no creaking sensation at all in the process of making cut bristles, cutting them roughly to a certain length, and styling the hair.
There is almost no disturbance or collapse of the bundle. Even when these cut bristles are roughly implanted in a fixed number onto the brush base material (handle), the incidence of defective products is significantly reduced, productivity is improved, and the quality of the brush is also significantly improved.

Although the reason for this effect of the present invention is not clear, it is believed that by using amino-modified silicone oil, the compatibility of the silicone oil with the monofilament increases and the smoothing and lubricating effects are further improved. Conceivable.

The effects of the present invention will be further explained with reference to Examples below.

(Example) Toshi ■ nylon 610 tip (0M2001>40
#ψ Extruder, polymer temperature 260℃
When melt spinning under the following conditions, subsequently stretching 4.5 times, relaxing heat treatment, and then winding,
A 0.20% by weight aqueous emulsion of the modified silicone oil or unmodified dimethylpolysiloxane having the amino groups shown in Table 1 was applied to the monofilament using an oiling roller in a predetermined amount shown in Table 1.

The thus obtained monofilament with a diameter of 0.21 m was then converged into a bundle with a diameter of 50 m, taped with a taping machine, and then cut into a length of 30 Mn to form cut bristles.

The cut bristle was defibrated by hand kneading, the tape was removed, the hair was thoroughly styled, and the hair was then subjected to the following hair transplantation operation.

That is, the above-mentioned cut bristle having a length of 30 m was drilled into a toothbrush handle made of As resin using a flocking machine.
A toothbrush was made by planting 18 bristles in each of 5 m holes and 38 holes.

The evaluation results of the hair styling and hair transplanting properties during the above hair styling and hair transplanting operations are also shown in Table 1.

The hair styling and hair transplanting properties were evaluated according to the following criteria.

A. Squeaky feeling...Cut 1 cut to a length of 30m
~When kneading the bundle of brittle while holding it with both hands, Q~No squeak Δ~Some squeak X~Very strong squeak 89 Disturbed bundle...Length 30# cut cup 1
~ When kneading the bundle of brittle while holding it with both hands, ○ ~ The bundle is not disturbed at all Δ ~ The bundle is slightly disturbed After leaving the bundle of cut bristle for at least 24 hours, unravel the paper tape halfway, and feel the feel of the monofilament when you hold it directly with your hand, and the fragility of the monofilament when you unravel the bundle by hand. Condition O ~ Not sticky at all, good sagging Δ ~ Slightly sticky The total number of flocks in which the number of flocks is uneven and where irregularities are observed is calculated as the total number of flocks (4
00)).

As is clear from the results in Table 1, the brush monofilaments 1 to 5 (Nα1 to 5) of the present invention have better hair styling and hair flocking properties than the case in which no amino-modified silicone oil is used (Nα8). This is a huge improvement. On the other hand, when unmodified dimethylpolysiloxane is used instead of amino-modified silicone oil (Nα6 and 7), the effect of improving hair styling and hair planting properties is extremely inferior to that of the present invention.

(Effects of the Invention) As explained above, the monofilament for a brush of the present invention does not give a squeaky feeling and is easy to handle in the hair styling process, and hardly causes any disturbance or breakage of the bundle. Furthermore, the monofilament for brushes of the present invention significantly reduces the incidence of defective products during flocking, improves productivity, and significantly improves the quality of the resulting brushes. As described above, the monofilament for brushes of the present invention has excellent hair styling and flocking properties, and is highly expected to be applied to general brushes such as toothbrushes, hairbrushes, and clothing brushes.

Claims (1)

[Claims] A monofilament for brushes comprising a monofilament made of a synthetic linear polymer whose surface is coated with amino-modified silicone oil.