JPH0618891B2 - Method for producing transparent perfuming plastic products - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing a transparent perfumed plastic product, and more particularly to a method for producing a transparent plastic product that continues to emit a constant scent over a long period of time.

[Problems to be Solved by Prior Art and Invention]

Plastic products that utilize the characteristics of various plastics include daily necessities, furniture, electrical equipment parts, electric wires,
It is widely used as machine parts, agricultural films, etc., and molded products, laminated products, various plates, rods, films, foamed plastics, paints, adhesives, etc. are manufactured.
The plastics used in these products use each resin alone, copolymerize two or more kinds of raw materials, and use a reinforcing agent and a stabilizer to improve the properties according to the purpose. Agents, colorants, foaming agents, antistatic agents, etc. are added. Further, a method of imparting a scent component to a plastic product, a plastic product having a scent, and the like have also been proposed. For example, a pressure sensitive adhesive having a scent and a method for producing the same (Japanese Patent Laid-Open No. 59-70077), a scent device for a telephone device. (JP-A-56-70628), resin products having an aroma (JP-A-57-78440), and the like. Further, JP-A-53-154133 discloses a method using cyclodextrin, which is a dry powder. A method for producing a synthetic resin product having excellent thermal stability and emitting a fragrance for a long period of time by mixing and molding a cyclodextrin inclusion compound as a flavoring agent and a thermoplastic resin material is proposed.

Although it is possible to perfume the plastic by these methods, the properties required for the plastic are often affected by the use of cyclodextrin. In particular, when producing a plastic product that requires “transparency”, if the perfume cyclodextrin clathrate compound of the above-mentioned method is used for perfume, it will be a fatal minus. This is because normal cyclodextrins such as α-cyclodextrin, β-cyclodextrin and γ-cyclodextrin used are hardly dissolved in water and various solvents, and a flavor powder obtained by inclusion with such cyclodextrin. When a product is mixed with a plastic material and molded, the product exhibits a spot phenomenon or a clouding phenomenon and loses transparency.

[Means for solving problems]

Therefore, the present inventors, maltosyl cyclodextrin in terms of solubility and the like in water-soluble and hydrophilic solvents,
Focusing on its superiority to conventional cyclodextrins, the inventors have studied a method for producing a transparent plastic product having a scent using this, and completed the present invention.

That is, the present invention relates to a method for producing a transparent perfumed plastic product, which comprises mixing and molding a clathrate of a flavor with maltosyl cyclodextrin and a plastic material.

Maltosyl cyclodextrin (hereinafter abbreviated as G ₂ -CD) used in the present invention includes α-cyclodextrin (hereinafter abbreviated as α-CD) and β-cyclodextrin (hereinafter referred to as β-CD). 1 or 2 molecules of maltose are bound to a cyclodextrin (hereinafter abbreviated as CD) such as γ-cyclodextrin (hereinafter abbreviated as γ-CD) or the like, and one or two molecules of maltose are bound to α-1,6. The following, maltose bound to α-CD is G ₂ -α-CD, and that bound to β-CD is G ₂ -β-.
Those bound to CD and γ-CD are called C ₂ -γ-CD.

G 2 _-CD is obtained potato starch, the raw starch such as corn starch, Bacillus macerans, Bacillus steer Rosa Moff illustrations, microorganisms such as Bacillus megaterium is by the action of cyclodextrin glucanotransferase transformer Hue hydrolase produced Α-CD, β-C
It can be produced by adding maltose to a CD mixture containing D, γ-CD and allowing pullulanase to act under specific conditions. In addition to G ₂ -CD, G ₂ -G ₂ -CD in which two molecules of maltose are bound to CD is also produced at the same time, but the present invention may include these components.

Like other CDs, G ₂ -CD has a so-called inclusion function of incorporating a guest in the ring structure of CD, but since it has a branched maltose, it is included as a conventional CD. The behavior is significantly different.

As shown in FIG. 1 and Table 1, G ₂ -CD has drastically improved solubility in water and organic solvents as compared with conventional CD, and attention is also paid in this respect. Table 1 shows the solubility in organic solvents in comparison with the conventional CD. In addition, G ₂ -CD in FIG. 1 and Table 1 is G _{2
-Α-CD, G 2 -β-} CD and _G 2-gamma-CD is approximately 6: 3: those which are composed of 1 ratio. _G 2 -CD used in the present invention is not intended to be bound by this ratio as long as it has the above characteristics, _G 2 -α-CD according to the _{purpose, G} 2 _-β-CD and _{G 2} - γ-C
D may be used alone, or a mixture of these in an appropriate ratio may be used.

As a method for inclusion of a fragrance using G ₂ -CD in the present invention, a method of dissolving G ₂ -CD in water or an organic solvent in advance and then adding a fixed amount of the fragrance to it and homogenizing or sufficiently kneading it is possible. can give.

The fragrance used in the present invention may be any of natural fragrances such as Abies oil, anise oil, cinnamon oil, lavender oil and lemon oil, and synthetic fragrances such as geraniol, eugenol, citral, and insect repellents such as dichlorobenzol. Can be appropriately selected according to the purpose.

If water is used as solvent for the G ₂ -CD, concentration 10
60%, preferably adjusted to be in the _G 2 -CD solution 40-50%, then 1% to 30% per solids _G 2 -CD perfume, preferably added 10-20% and homogenized. Homogenizing conditions are 5,000 rpm to 1
5,000 rpm, preferably 8,000 rpm to 10,000
It may be carried out at 0 rpm for 5 to 30 minutes, preferably 10 to 15 minutes.

Next, the inclusion product of the fragrance obtained by the above method is spray-dried,
It is dried by an appropriate ordinary method such as vacuum drying to obtain a perfume clathrate powder product. The flavor-inclusion powder product holds a small amount of water, and this small amount of water may adversely affect the quality in the process of obtaining a plastic molded product. In this case, instead of water, a hydrophilic organic solvent as shown in Table 1 may be used as the solvent, and the concentration of G ₂ -CD, the amount of the fragrance added, and the inclusion method may be the same as when the aqueous solvent is used. You can follow the procedure. When a hydrophilic organic solvent is used, it may be pulverized as in the case of using a water solvent, or the perfume clathrate solution may be kneaded with the plastic raw material as it is.

The ratio of G ₂ -CD to the fragrance can be adjusted appropriately, but basically, when a weak fragrance is desired to be released for a long period of time, the ratio of the fragrance is reduced and the intensity of the fragrance is set to be longer than the release time. If it is desired to emphasize it, the fragrance ratio may be increased.

The plastic raw material to be mixed with the perfume clathrate obtained as described above may be either a thermoplastic resin or a thermosetting resin. As a method of mixing the fragrance inclusions,
It may be sufficiently kneaded with the plastic raw material by an appropriate means before the molding stage. The molding method may be a conventional method such as injection molding or extrusion molding in consideration of the form of the product.

〔Example〕

 Next, the present invention will be described in detail with reference to Examples.

Example 1 _45% G 2 -CD aqueous solution was prepared, to which _G 2 -CD 10% of lemon oil was added to, 2 10,000rpm
Homogenized for 0 minutes. Next, this perfume clathrate solution was spray-dried under the conditions of an inlet temperature of 170 ° C. and an outlet temperature of 95 ° C., and the obtained powder product was designated as Sample I. 3% by weight of this was added to the polyester polymer chip, and a polyester sheet was molded by a conventional method. As an example for comparison, α
-CD60%, using beta-CD30%, a CD mixture comprising gamma-CD 10% instead of _G 2 -CD, other conditions G
_The powder product obtained in the same manner as _2- CD was designated as Sample II.
Using this sample, a polyester sheet was molded in the same manner as above. The scent of the obtained molded product was sensory evaluated and the transparency was measured, and the results are shown in Table 2. The transparency is a value indicated by the light transmittance at a wavelength of 500 mμ.

As is clear from the table, the polyester sheet made from sample I is about the same as sample II in odor emission, but is very excellent in transparency. The highly transparent fragrance sheet is useful as a material for rugs such as table cloths and cupboards.

10 _G 2 -CD in Example 2 Dimethyl sulfoxide (DMSO)
Dissolved 0 W / V%, followed by 20 relative to the weight of _G 2 -CD
% Amount of paradichlorobenzene was added and stirred well.

The perfume clathrate thus obtained was added to a polyvinyl chloride resin in an amount of 2%, and an agricultural coating film having an insect repellent effect was produced by calendering. The film had good transparency, good light transmission, and insect repellent effect lasted for nearly a year.

Meanwhile, insect repellent effect of agricultural covering film produced by adding the same amount of p-dichlorobenzene directly without using the G 2 _-CD lasted only 1 month.

〔The invention's effect〕

According to the present invention, various products can be manufactured by using transparent perfume plastics, and thus it is possible to add unprecedented commercial value in fields such as general industry, agriculture, and food processing. In other words, fragrance and transparency of plastic products contribute to product diversification.

[Brief description of drawings]

FIG. 1 is a graph showing the solubility of G ₂ -CD in water.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Nobuhiro Kuwahara Inventor Nobuhiro Kuwahara 2493-10 Fujisawa, Kanagawa Prefecture Dormi Fujisawa D-801 (72) Inventor Hajime Takaku 2821 Isu, Kamisu-cho, Kashima-gun, Ibaraki Shosan-Kususha House 1- 308 (72) Inventor Okujuki 1-15-10-1103 Tsukishima, Chuo-ku, Tokyo (72) Inventor Yasuo Kogure 419-7 Jimbohara, Kamisato-cho, Kodama-gun, Saitama Prefecture

Claims (1)

[Claims] 1. A method for producing a transparent perfumed plastic product, which comprises mixing an inclusion compound of a perfume with maltosyl cyclodextrin and a plastic material and molding the mixture.