JPH0236111B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention can be used in high temperature conditions,
In addition, it provides sustained release properties to flavoring substances that volatilize quickly,
The present invention relates to a hydrophobic gel-like aromatic composition that promotes the volatilization of a fragrance substance with a slow volatilization rate, and relates to a composition useful as various aromatic agents, particularly as an automotive aromatic agent. [Prior Art] As gel-like fragrances, hydrated gel fragrances and hydrophobic gel-like fragrances with relatively low water content have been reported.
and is provided to the market as a product. Hydrogel air fresheners have been known for a long time, including hydrated gels such as agar and carrageenan.
Recently, polyvinyl-based materials have also come to be used. These are used as fragrances by gradually exuding the fragrance onto the surface of the gel as water evaporates. However, these hydrated gel fragrances tend to separate water, and especially when thawed after freezing, a large amount of water is separated, resulting in a significant decrease in commercial value. Moreover,
These hydrated gel fragrances also have poor heat resistance and are unsuitable for applications where they are exposed to high temperatures, such as automobile fragrances. On the other hand, research into hydrophobic gel fragrances began because ethanol, ethylene glycol monoethyl ether, etc. can be easily gelled with sodium stearate, and in recent years, attempts have been made to use paraffinic and isoparaffinic hydrocarbons as gelling solvents. (Special Publication No. 56-6783, Special Publication No. 57-
Publication No. 50502, etc.). However, these hydrophobic gel fragrances require water to dissolve sodium stearate as a gel forming agent. For this reason, these hydrophobic gel fragrances have the disadvantage of being sensitive to heat and typically causing dissolution at temperatures below 60°C. Moreover, the produced gel lacks transparency, which reduces its commercial value. [Problems to be Solved by the Invention] In order to solve the above-mentioned conventional drawbacks and obtain a fragrance that is stable against heat and has excellent transparency, the present inventor has developed a hydrophobic gel that does not particularly require water. As a result of repeated research, it was discovered that a composition containing a gel forming agent, a gelling aid, a fragrance substance, an aromatic alcohol as a gelling solvent, and a specific volatile silicone is a suitable material for this purpose. The heading completes the invention. [Means for Solving the Problems] The present invention provides gel forming agents, gelling aids, aromatic alcohols, and The present invention provides a hydrophobic gel-like aromatic composition comprising a volatile silicone represented by the formula (wherein n represents 4 or 5) and a fragrance substance. In the present invention, higher fatty acid salts, specifically salts of stearic acid, such as sodium salts, aluminum salts, magnesium salts, and lithium salts, are used as gel forming agents. In particular, sodium stearate is preferably used. The amount of the gel forming agent added is usually 1 to 6% by weight, preferably 4 to 5% by weight based on the total amount. Further, in the present invention, a mixture of ethyl alcohol and/or n-propyl alcohol and hexylene glycol is preferably used as the gelling aid. That is, in the present invention, as one component of the gelling aid, either ethyl alcohol or n-propyl alcohol is used alone, or both are used in combination. Usually ethyl alcohol or n-
Propyl alcohol is selected and used as one component of the gelling aid. The selection of either ethyl alcohol or n-propyl alcohol is made by taking into consideration the compatibility between the flavor substance and the gelling solvent, and when the compatibility is relatively poor, for example, when the flavor substance is difficult to dissolve. Sometimes it is preferable to use a little more, and conversely when the fragrance substance is easily soluble, it is preferable to use a little less. These lower alcohols also have the purpose of helping volatilize the heavy parts in the blended fragrance, so they need to be added in an amount of 5% by weight or more based on the total amount, and 5 to 10% by weight.
It is preferable to add. On the other hand, hexylene glycol is preferably used as the other component of the gelling aid. By using hexylene glycol here, in addition to its role as a gelling aid, the lower alcohols, which are one of the ingredients, promote the volatilization of fragrance substances, while the use of hexylene glycol helps to reduce the volatilization of light parts in the blended fragrance. It can suppress the fragrance and maintain the balance of the fragrance. This hexylene glycol needs to be added in an amount of 3% by weight or more based on the total amount, and preferably in an amount of 3 to 10% by weight. In addition, as the other component of the gelling aid, propylene glycol can be used in addition to the above-mentioned hexylene glycol, but since it requires 2 to 4 times the amount of hexylene glycol, it is difficult to use due to the overall composition. It is difficult to say that it is a very preferable gelling aid. In addition, if the above-mentioned lower alcohols and hexylene glycol used as gelling aids are generally too large, the gel will soften and will not have an appropriate gel strength, and if it is too small, it will be difficult to make the gel uniform. It disappears. Therefore, although there is no particular restriction on the mixing ratio of the two, it is necessary to mix them with sufficient care. Next, in the present invention, an aromatic alcohol is used as a gelling solvent. Here, the aromatic alcohol may be any alcohol having an alcohol side chain in its aromatic ring, and the side chain alcohol may be a straight chain alcohol, a branched alcohol, or an ether bond type alcohol. However, it may be either a saturated alcohol or an unsaturated alcohol. In this way, there are no particular restrictions on the aromatic alcohol, but in order to avoid using it in specific limited conditions, it is preferable that it is liquid at room temperature and odorless or has a slight odor. Those having a compound-specific aroma such as cinnamic alcohol are not very preferable. From this point of view, it is preferable to use one or more aromatic alcohols selected from the group consisting of benzyl alcohol, β-phenylethyl alcohol, and phenoxyethyl alcohol. These aromatic alcohols are almost odorless or have a slight odor, are almost colorless, and can form a strong gel. Furthermore, these aromatic alcohols are excellent gelatinizing solvents that control the volatilization of so-called light fragrance substances that have a high volatilization rate, and conversely also have a retentive effect on fragrance. These aromatic alcohols contain 5 to 50% of the total amount
It is blended in an amount of 75% by weight, preferably 30 to 70% by weight. In the present invention, a volatile silicone represented by the above formula [] is mixed with the aromatic alcohol. When octamethylcyclotetrasiloxane in the above formula [] where n is 4 is used as the volatile silicone, that is, the cyclic dimethylpolysiloxane, it is possible to promote the volatilization of a fragrance substance having a slow volatilization rate. On the other hand, decamethylcyclopentasiloxane in which n is 5 has a rather slow self-volatilization rate, so it has the function of suppressing the volatilization of fragrance substances. Therefore, by appropriately selecting and using both according to the slow volatilization rate of the fragrance substance,
The volatilization rate of the fragrance substance can be adjusted. However, it is desirable to avoid using a mixture of the two, as this will lead to deterioration of gel strength. Note that this volatile silicone contains a mixture with the aromatic alcohol as the gelling solvent in an amount of 50% by weight, preferably 50 to 80% by weight, more preferably 60% by weight based on the total amount.
It is used in a range of ~70% by weight. Furthermore, a fragrance substance is used in the present invention.
The fragrance substance used in the present invention is not particularly limited as long as it is soluble in the mixture of aromatic alcohol and volatile silicone, and includes linear aldehydes, aromatic aldehydes, aromatic phenols,
Examples include various types of hydrocarbons. Specific examples include geraniol, methyleugenol, cyclamenaldehyde, α-hexylcinnamaldehyde, l-carvone, methylionone, amyl salicylate, benzyl benzoate, benzyl salicylate, methyl anthranilate, and methyl benzoate. These fragrance substances are used in an amount of 0.1 to 50% by weight, preferably 0.2 to 30% by weight based on the total amount. When used as a slightly fragrant air freshener, it is appropriate to add fragrance at around 0.2% by weight, and when used as a room air freshener, car air freshener, etc., it is generally used at a high addition rate of 10 to 30% by weight. . In addition, various volatile chemicals can also be added together with or instead of these flavoring substances. Also, if necessary, to prevent deterioration of the gelling solvent.
Antioxidants such as BHT can also be added.
Usually, this antioxidant is added in an amount of about 0.2% by weight. In addition, pigments, fungicides, etc. may be added as appropriate depending on the purpose. The hydrophobic gel-like aromatic composition of the present invention as described above is formulated, for example, as follows. Volatile silicone is added to aromatic alcohol as a gelling solvent, higher fatty acid salt is added as a gel forming agent, hexylene glycol is one component of the gelling aid, and BHT is added as an antioxidant. After heating to a temperature of 100°C to fully dissolve it, it is cooled to about 80-95°C, and while maintaining this temperature, ethyl alcohol and/or n-propyl alcohol are added as the other component of the flavoring substance and gelling aid. Stir to mix. This mixed solution is placed in a suitable container, covered with a simple lid to prevent volatilization, and left to cool to room temperature, or slowly cooled to solidify. In this case, it is necessary to avoid rapid cooling because the resulting gel becomes cloudy. Depending on the type of flavor substance used, it may be mixed and dissolved with ethyl alcohol and/or n-propyl alcohol as the other component of the gelling aid from the beginning. [Example] Hereinafter, the present invention will be explained in more detail with reference to Examples. Example 1 In a 300 ml beaker, a predetermined amount of benzyl alcohol (manufactured by Takasago International Co., Ltd.) shown in Table 1 as an aromatic alcohol, a predetermined volatile silicone shown in Table 1, and stearic acid as a gel forming agent. 6 g of sodium, 6 g of hexylene glycol as one component of the gelling aid and as an antioxidant
0.2 g of BHT was added and sufficiently stirred and dissolved on an oil bath at an internal temperature of 120°C, and then naturally cooled to 95°C while stirring to form a gel matrix. Separately, 15 g of the blended fragrance shown in Table 1 (manufactured by Takasago Fragrance Industries Co., Ltd.) and 7.8 g of ethyl alcohol as the other component of the gelling aid were mixed and prepared, and this was added to the gel base material. 90
The mixture was mixed and stirred while being heated so that the temperature did not drop below ℃. After mixing, the mixture was poured gently into a paper cup of about 150 ml to prevent air from entering, covered with aluminum foil, and left to cool overnight to obtain a hydrophobic gel-like aromatic composition. The next day, remove this gel from the paper cup and
The melting point of the gel was measured by the following method.
The results are shown in Table 1. Further, a perfume volatilization test was conducted on this gel using the following method. The results are shown in Figure 1. Melting point measurement of gel Place the gel in a shear dish, place it in a constant temperature bath, gradually raise the temperature, visually observe the degree of melting on the surface, and determine the melting point by the temperature at which the liquid drips from the surface. did. Fragrance volatilization test Transfer the gel to a chalet, place it in a wind tunnel experimental machine, and measure its weight over time at room temperature (approximately 15 to 20 degrees Celsius) while blowing air at 2.5 m/sec. to calculate the amount of volatilization. Written. Examples 2 to 4 A hydrophobic gel-like aromatic compound was prepared in the same manner as in Example 1, except that the specified aromatic alcohol and volatile silicone shown in Table 1 were used in the specified proportions shown in Table 1. A composition was obtained, and the melting point of this gel was measured and the fragrance volatilization test was performed. The results are shown in Table 1 and Figure 1, respectively. In addition, the gel hardness for Examples 1 to 4,
Evaluation results regarding color tone and appearance (transparency) are also shown in Table 1.

【table】

〔Effect of the invention〕

The hydrophobic gel-like aromatic composition of the present invention as described above is less prone to dissolution even at high temperatures (60° C. or higher) than conventional compositions. Moreover, since the hydrophobic gel-like aromatic composition of the present invention does not require water, it has relatively excellent transparency, and provides sustained release by suppressing the volatilization rate of perfume substances that volatilize quickly. Therefore, the hydrophobic gel-like aromatic composition of the present invention can be effectively applied to applications that could not be conventionally used, such as automobile air fresheners, regardless of whether it is a forced air type or a stationary type. Furthermore, the hydrophobic gel-like aromatic composition of the present invention can be widely used as a sustained-release deodorant, an insecticide, an insect repellent, an insect attractant, an insect repellent, etc. in addition to an aromatic agent.

[Brief explanation of drawings]

FIG. 1 is a graph showing changes over time in the amount of fragrance volatilized for the hydrophobic gel-like aromatic compositions of the present invention obtained in Examples 1 to 4.

Claims (1)

[Claims] 1 Gel forming agent, gelling aid, aromatic alcohol, the following formula A hydrophobic gel-like aromatic composition comprising a volatile silicone represented by the formula (wherein n represents 4 or 5) and a fragrance substance. 2 The aromatic alcohol is benzyl alcohol,
The composition according to claim 1, which is one or more selected from the group consisting of β-phenylethyl alcohol and phenoxyethyl alcohol. 3. The composition according to claim 1, wherein the amount of aromatic alcohol blended is 5 to 75% by weight. 4. The composition according to claim 1, wherein the gelling aids are ethyl alcohol and/or n-propyl alcohol and hexylene glycol.