JPH0320141B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a female mold resin for producing a wig base that is easy to use, has excellent moldability, and can be recycled. It's about materials. Specifically, a thin plate made of a polymer resin material that can be heated and molded at a relatively low temperature and hardens when cooled to room temperature is heated and softened, pressed against the head to be molded, and then cooled and hardened. This invention relates to a resin material for making a mold of a wig head to make a female mold. (Prior Art) One method of making a head impression of a wig, which has been conventionally performed, is as follows. First, the head is covered with a flexible synthetic resin film such as a vinyl chloride polymer film, wrapped around it with adhesive tape, and then the adhesive tape is applied to the entire surface and a mold is made. Then, using this as a female mold, a rubber or synthetic resin film is formed on the surface, and this is peeled off to obtain a wig base. However, this method has the major drawback that, in addition to being complicated to operate, it is impossible to obtain a wig base that accurately reproduces the shape of the head due to shrinkage and deformation of the resin film and adhesive tape. . On the other hand, JP-A-55-116804 discloses a method in which a thin plate of transisoprene polymer is softened by heating, pressed against the head, and then cooled and hardened to obtain a female mold. (Problems to be Solved by the Invention) Although the head molding method using the above-mentioned transisoprene polymer has the excellent feature that the molding operation is simple and easy, the reproducibility of the molding is not necessarily high. It wasn't enough. Furthermore, trans isoprene polymers are expensive;
Although it is desirable to recycle the scrap, there is a problem in that the recycled resin is difficult to crystallize because the polymer is easily disintegrated, making it impossible to recycle the scrap. (Means and Effects for Solving the Problems) The present inventors have arrived at the present invention as a result of intensive studies to improve the drawbacks of the above-mentioned transisoprene polymer resin. That is, the present invention has the following properties: 1 Trans bond content 75-95%, weight average molecular weight (w) 30000-500000, and molecular weight distribution (w/
at least 30% by weight of a crystalline high trans-butadiene polymer having a structure of Mn) 1.2 to 5.0;
Contains a polymer resin material for making a wig head mold. 2. A polymer for making a wig head mold, comprising 30 to 90% by weight of the crystalline high trans-butadiene polymer described in item 1 above and 70 to 10% by weight of a trans-isoprene polymer, trans-polyoctemanor or caprolactone polymer. resin material. It is. The essential polymer resin component in the present invention is a butadiene polymer with a high trans bond content that exhibits crystallinity at room temperature. A particularly preferred structure of the crystalline high trans-butadiene polymer is as follows. First, the trans bond content measured by the Morello method using an infrared spectrophotometer is 75 to 95%, and the weight average molecular weight (w) measured by gel permeation chromatography is 30000 to 500000.
The molecular weight distribution (w/) represented by the ratio of weight average molecular weight to number average molecular weight is in the range of 1.2 to 5.0. Normally, the polymer resin component of the polymer resin material for head molding is preferably a crystalline high trans-butadiene polymer alone, but depending on the operating conditions etc., the rigidity of the resin material and moldability may be increased. ,Strength,
In order to improve operability etc., it may be preferable to use a mixture with other polymer resins. However, even in this case, unless at least 30% by weight of the crystalline high trans-butadiene polymer is contained as a polymer resin component, the effects aimed at by the present invention cannot be sufficiently exhibited. Particularly preferable examples of other polymer resin components to be mixed include trans-isoprene polymer,
Examples include transpolyoctenamer and caprolactone polymer. The crystalline high trans-butadiene polymer of the present invention is a homogeneous polymer comprising a butadiene monomer, for example, a barium, strontium or calcium compound, an organolithium compound and/or an organomagnesium compound, and optionally an organoaluminium compound. Composite catalyst (see JP-A-55-38827, JP-A-56-112916), or
It can be easily obtained by solution polymerization in a hydrocarbon solvent in the presence of a homogeneous composite catalyst consisting of a lanthanide transition metal compound such as lanthanide and an organometallic compound such as organomagnesium. As the trans isoprene polymer mentioned in the present invention, for example, Kuraray TP-301 manufactured by Kuraray Isoprene Chemical Co., Ltd. can be used. In addition, as transpolyoctenamer,
For example, Vestenamer 8012 and Vestemanor A9 manufactured by Hjuls can be used. moreover,
As the caprolactone polymer, for example, Plaxel H-7, Plaxel H-4, and Plaxel H-1 manufactured by Daicel Chemical Industries, Ltd. can be used. In the polymer resin material for making a wig head mold of the present invention, in addition to the polymer resin components described above, a plasticizer and an inorganic filler can be added as necessary to adjust hardness, plasticity, etc. Further, stabilizers, pigments, etc., which are general additives added to polymer resins, can be appropriately added in the case of the present invention as well as in conventional resin materials. The amount of plasticizer used usually depends on the polymeric resin component.
It ranges from 1 to 30 parts by weight per 100 parts by weight. Examples of plasticizers include dibutyl phthalate, di-
(2-ethylhexyl) phthalate, di-(2-ethylhexyl) adipate, diethylene glycol dibenzoate, butyl stearate, butyl epoxy stearate, tri-(2-ethylhexyl) phosphate, and the like. The inorganic filler and amount used depends on the polymer resin component.
The amount is 1 to 100 parts by weight per 100 parts by weight. Examples of inorganic fillers include calcium carbonate, silicic acid, calcium silicate, clay, talc, mica, bentonite, and the like. The polymer resin material of the present invention can be easily mixed using an extruder, kneader, roll, etc. The set temperature of these devices can be freely selected within the range of 60 to 200℃, but preferably 80 to 200℃.
It is best to set the temperature to 180℃. Alternatively, they can be dissolved in a suitable solvent and mixed during dissolution. (Effects of the Invention) The polymer resin material for making a wig head mold provided by the present invention has a simple and easy head molding operation, excellent reproducibility of molding, and is scrapable. It has the feature that it can be recycled and reused. (Example) In order to explain the present invention in more detail, Examples of the present invention are shown below. Examples 1 to 9, Comparative Examples 1 to 3 A total of 100 g of trans-butadiene polymer, trans-isoprene polymer, trans-polyoctenamer, and caprolactone polymer with the composition shown in Table 1 was weighed out, stirred well, and heated to 140°C. The mixture was put into the set Laboplast Mill (manufactured by Toyo Seiki Seisakusho Co., Ltd.) and kneaded for 5 minutes at a screw rotation speed of 50 rpm to obtain a polymer resin material. The obtained polymer resin material was press-molded at 120°C, and its deformation temperature, hardness, and head molding moldability (reproducibility) were tested. Scrap reusability was evaluated by repeating the process of kneading and press molding five times under the same conditions as above, and then evaluating the hardness of the molded resin after cooling it at room temperature for 30 minutes. The physical properties of the trans-butadiene polymer vary depending on its structure, but the hardness of the resulting resin material depends on the structure of the trans-butadiene polymer.
Table 1 shows that resin materials with a sufficient hardness of 85 or higher and excellent moldability, and which have a hardness of 85 or higher in recycled test products, contain crystalline butadiene polymers with a high trans content. I understand. 【table】

Claims (1)

[Claims] 1. Trans bond content 75-95%, weight average molecular weight (w) 30,000-500,000, and molecular weight distribution (w/
n) A polymeric resin material for making a wig head mold, which contains at least 30% by weight of a crystalline high trans-butadiene polymer having a structure of 1.2 to 5.0. 2 Trans bond content 75-95%, weight average molecular weight (w) 30000-500000 and molecular weight distribution (w/
n) For making a wig head mold, consisting of 30-90% by weight of a crystalline high trans-butadiene polymer having a structure of 1.2-5.0 and 70-10% by weight of a trans-isoprene polymer, trans-polyoctemanor or caprolactone polymer. Polymer resin material.