JP2003138291A - Transparent candle composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transparent candle composition having good shelf stability, shape retention, heat resistance and the like. SOLUTION: The transparent candle composition comprises a solidifying agent and a combustible liquid as the essential components, and the solidifying agent is mainly a polymerized fatty acid based polyamide compatible with the combustible liquid, and the combustible liquid is mainly a saturated alcohol having a branched structure.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a composition for transparent candles, a solid transparent candle comprising the composition, and a method for producing a solid transparent candle. More specifically, the present invention provides a composition for transparent candles that can supplement the drawbacks of conventional transparent candles.

In the candle of the present invention, the "solid state" means a self-supporting hard candle such as a paraffinic candle which has been conventionally used, and a liquid or jelly-like candle is separately used. The concept excludes soft candles that cannot maintain their shape without a container.

[0003]

BACKGROUND OF THE INVENTION Candles have a long history, but in recent years, the use of candles for decoration has become a major part. And so far, candles with various decorative shapes and colors have been manufactured. Among them, transparent candles are useful because they can be used for internal decoration and can be expected to have a higher decorative effect in the field of candles.

As transparent candles, liquid, gel-like (jelly-like) candles are known. For example, a transparent candle using a diblock / triblock polymer elastomer as a solidifying agent is known (Japanese Unexamined Patent Application Publication No. 200-200200).
0-2119892, Tokuyohei 11-511498, etc.).

Although the above candle has high transparency, it is a soft gel and therefore has poor storage stability (shape retention). That is, it deforms at high temperatures such as in summer, or it collapses with a slight impact. Therefore, it is difficult to apply to columnar candles and candles having other complicated shapes, and lacks versatility. Even when it is used, it must be put in a separate container for use, which is inconvenient. Furthermore, during combustion, spherical carbon adheres to the core and soot is generated, impairing the fantasy image. Further, there are drawbacks such that high temperature treatment and long-time treatment are required also in manufacturing, bubbles are mixed in during mold injection, and internal foaming easily occurs after molding.

Separately, a transparent candle composition using a thermoplastic polyamide as a gelling agent (solidifying agent) and a fatty acid, alcohol, ester or the like as a flammable solvent (combustible liquid) is known (Japanese Patent Publication No. 54-12948).

However, the above-mentioned candle requires several kinds of fine blending, and the hardness and heat resistance comparable to paraffin candles cannot be obtained.

In addition, a transparent candle using a dextrin fatty acid ester is also known (Japanese Patent Laid-Open No. 20-200200).
00-44985).

The above transparent candle is hard and has self-supporting property, but since the cost of the solidifying agent is high and the proportion of the solidifying agent added is high, the transparent candle does not meet the unit price of the candle demand and is practically used. hard. Further, the foaming during production was severe, and the molding process was troublesome.

[0010]

As described above, the conventional transparent candles have not been sufficiently satisfactory for storage, use and production. In view of the above, the present invention is a composition for transparent candles capable of eliminating the disadvantages of conventional transparent candles, a solid transparent candle comprising the composition,
And a method for producing a solid transparent candle.

[0011]

[Means for Solving the Problems] In order to solve the above problems, the present inventors have
The present invention has conceived a candle composition having the following constitution.

The composition for transparent candles, which is one of the present invention, contains a solidifying agent and a combustible liquid as essential components, and the solidifying agent is mainly a polymerized fatty acid polyamide which is compatible with the combustible liquid. The flammable liquid is mainly composed of a saturated alcohol having a branched structure.

In the above structure, the saturated alcohol is preferably a higher monohydric alcohol, particularly a higher monohydric alcohol having 20 or more carbon atoms. This is because the use of higher alcohol improves the heat resistance of the transparent candle.

In the above, it is desirable that the softening temperature of the polymerized fatty acid polyamide is about 130 ° C. or lower, preferably about 100 ° C. or lower, and the ignition temperature of the saturated alcohol is about 170 ° C. or higher, preferably about 200 ° C. or higher. . If the softening temperature of the polymerized fatty acid-based polyamide is too high, a high-temperature treatment is required when mixing with a saturated alcohol during production, and the compatibility with the saturated alcohol is reduced. Further, if the ignition temperature of the saturated alcohol is too low, the flame spreads too much at the time of burning the candle, and not only the core portion but also the candle body portion burns at once.

In the above structure, the mass composition ratio of the solidifying agent and the flammable liquid is such that the former / the latter = about 30/70 to 70 /.
It is preferably 30. If the content of the solidifying agent is too small, the candle becomes soft and the storability is deteriorated. On the contrary, if the content of the flammable liquid is too small, the burning of the candle becomes worse.

A transparent candle composition, which is another aspect of the present invention, contains a solidifying agent and a combustible liquid as essential components, and the combustible liquid contains a saturated alcohol having a branched structure as a modifier. It is characterized by

The difference from the previous composition is that the saturated alcohol was added as a modifier rather than as the main component of the flammable liquid. Also in this configuration, for the same reason as described above, the saturated alcohol is preferably a higher monohydric alcohol, particularly a higher monohydric alcohol having 20 or more carbon atoms.

The transparent candle of the present invention is a transparent candle obtained from the above-mentioned composition for transparent candles, which is characterized by having a hardness which is self-supporting (self-maintaining).

In the above structure, the polymerized fatty acid-based polyamide used in the vicinity of the core has an acid value of about 5 mgKOH / g or less,
Total amine value: about 3 mgKOH / g or less, melt viscosity: about 150 to
The polymerized fatty acid-based polyamide used near the surface has an acid value of about 20.0 mgKOH / g, a total amine value of about 0.3 mgKOH / g or less, and a melt viscosity of about 500 to 10
When it is set to 00 mPa · s, a solid transparent candle having good flammability and shape retention can be obtained.

The method for producing a solid transparent candle of the present invention comprises heating the solidifying agent to a temperature above its softening temperature to form a liquid, compatibilizing it with a flammable liquid to form a mixture, and then forming the mixture into a mold. It is characterized by pouring and cooling and solidifying to room temperature.

In the above-mentioned manufacturing method, it is desirable to make the liquid paraffin compatible with the flammable liquid and then with the solidifying agent, because the compatibility becomes good.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION The candle composition of the present invention will be described in detail below.

The composition for transparent candles of the present invention is basically characterized by containing the following solidifying agent and flammable liquid.

(1) Solidifying Agent The polymerized fatty acid polyamide which has been used as a solidifying agent (gelling agent) in the conventional composition for candles can be used. Since the polymerized fatty acid-based candle can be made into a hard gel, the candle can have a self-supporting property.

The above-mentioned polymerized fatty acid-based polyamide is obtained by condensation of polymerized fatty acid and diamines and is represented by the following general formula: HO-(-CO-R-CONH-R'-NH-) n-H. It is what is done. The polymerized fatty acid-based polyamide is widely used in the fields of paints, adhesives and the like. Therefore, there are commercially available products having various structures, and they can be appropriately selected and used from among them.

For example, in the above chemical formula, polymerization comprising R: an alkylene group having 34 carbon atoms, R ': an alkylene group having 2 to 4 carbon atoms (ethylenediamine, trimethylenediamine, tetramethylenediamine, etc. are used as diamine). Fatty acid-based polyamide, R: alkylene group having 2 to 21 carbon atoms, R ': alkylene group having 2 carbon atoms (as diamine, ethylenediamine, trimethylenediamine,
Use tetramethylenediamine, etc.) with a molecular weight of about 60
Polymerized fatty acid-based polyamides of 00 to 50,000 and the like can be preferably used. It has low odor, no toxicity and irritation, and has good compatibility with the saturated alcohol described later, making it easy to handle. In general, the polymerized fatty acid-based polyamide is
Good compatibility with saturated alcohol described later.

When hydrogenated dimer acid is used as the polymerized fatty acid, the candle can have higher transparency.

As the polymerized fatty acid type polyamide, the softening temperature (softening point / melting point): about 130 ° C. or less, preferably 10
It is desirable to use one having a temperature of 0 ° C. or lower. The softening temperature in the present specification is a value measured according to the measuring method of "Testing method for softening point of epoxy resin" (JIS K 7234).

If the softening temperature is too high, flammable liquid (oil)
Compatibility with is poor. Further, it is difficult to handle because it requires a high temperature treatment when mixed with a softening / flammable liquid during the production of a candle.

Nylon or the like, which is a polyamide, cannot be used in the present invention because it has a high softening temperature and thus has poor compatibility with combustible liquids.

The acid value (A
V: acid value) is about 3 to 50 mgKOH / g, preferably about 15 to 30 mgKOH / g. If the acid value is too low, the melting point will be high, and when burning a candle, only the area near the center will burn, leaving a large amount of side. In addition, since the characteristics are hard, cracks easily occur due to temperature changes. On the other hand, if the acid value is too high, the stickiness becomes so strong that it becomes difficult to handle the candle with bare hands.

On the other hand, the amine value of the polymerized fatty acid polyamide is about 50 mgKOH / g or less, preferably about 5 mgKOH / g or less. If the amine value is too high, the stickiness and stickiness become strong, the coloring such as brown becomes strong, and the brown color changes easily when burning a candle.

Further, the above polymerized fatty acid polyamide is
Viscosity: VIS (200 ° C.) About 40 to 5000 mPa · s, preferably about 100 to 1000 mPa · s. If the viscosity is too high, the candle becomes less flammable and the flame becomes smaller. Also,
There is a problem with compatibility and moldability. On the contrary, if the viscosity is too low, the burning property of the candle is improved, but cracking due to sweating or heat change easily occurs.

The viscosity can be easily adjusted within the above range by diluting with a general-purpose organic solvent or the like.

(2) Flammable liquid saturated alcohol having a branched structure (branched structure / side chain structure) (hereinafter, may be simply referred to as “branched alcohol”)
To use.

The reason why an alcohol having a branched structure (branched alcohol) is used is that the freezing point / clouding point is lower than that of an alcohol having a linear structure with the same carbon number (linear alcohol). Therefore, at normal temperature, even if the linear alcohol having the same carbon number is solid, the branched alcohol can exist in a stable liquid state, which facilitates the handling. Also,
By being liquid, the transparency which is the object of the present invention can be favorably maintained.

The reason for using saturated alcohol is that it is stable against heat and oxidation. That is, since it has no unsaturated bond such as a double bond, it has good oxidation resistance. Conventionally, unsaturated alcohols having unsaturated bonds, unsaturated fatty acids, etc. have been used as flammable liquids, but since the unsaturated part is unstable to heat and light, odors and discoloration may occur during combustion. The liquefied dents (pools) that were generated and burned turned discolored black, and the appearance became dirty, which was not desirable. In addition, the light resistance was not good, and yellowing sometimes occurred as the candle was stored.

In comparison, the branched alcohol of the present invention is
All of these points have been improved, and even if it is burned, a bad odor or darkening of the depressions is unlikely to occur. Also, the storage stability is good.

In the above structure, the saturated alcohol is preferably a higher alcohol. This is because the use of higher alcohol improves the heat resistance of the transparent candle. The higher alcohol usually refers to an alcohol having 5 or more carbon atoms. In the present invention, a saturated monohydric alcohol having 10 to 35 carbon atoms, preferably 20 to 30 carbon atoms, and more preferably 23 to 26 carbon atoms is selected. To use.

As long as the higher alcohol is liquid, the higher the carbon number, the better. At present, those having a maximum carbon number of 26 are commercially available, but it can be inferred that a liquid having a higher carbon number can be used as well.

If the saturated alcohol has too few carbon atoms,
The heat resistance will decrease. In addition, alcohol having a small number of carbon atoms is hard to solidify (gel), so that means such as cooling is required at the time of solidification, which is troublesome at the time of production.

The reason for using monohydric alcohol is as follows.
This is because the viscosity is low and the handleability is good. If the viscosity is too high, the compatibility with the above-mentioned solidifying agent is lowered and the handling becomes difficult.

The saturated alcohol used in the present invention is
It is desirable to use one having a flash temperature (flash point / boiling point) of about 170 ° C. or higher, preferably about 200 ° C. or higher, more preferably 230 ° C. or higher. In addition, the flash temperature in this specification is measured by "flash point measurement test by a Cleveland open type flash point measuring device" (JIS K 2265-1980).

If the flash temperature of saturated alcohol is too low,
When the candle burns, the flame spreads too much and burns not only the core but also the candle itself. On the other hand, if the ignition temperature is too high, the flame during combustion may become smaller, or it may disappear and may not burn.

If the above saturated alcohol is used, a transparent candle having better heat resistance and light resistance and better processability than before can be obtained. Specifically, the number of carbon atoms is 24 to
In 26, a saturated monohydric alcohol having the following structure (Chemical formula 1) having a side chain having 10 to 11 carbon atoms and an —OH group at the end of the main chain can be used.

[0046]

[Chemical 1]

As shown in the above chemical formula, as the branched alcohol of the present invention, it is preferable to use one having a side chain at β carbon from the viewpoint of heat resistance and weather resistance of the candle. In addition, a branched alcohol having a side chain on γ carbon or the like can also be suitably used.

(3) The composition for transparent candles, which is one of the present inventions, is characterized in that the main component is the polymerized fatty acid polyamide as a solidifying agent and the saturated alcohol as a flammable liquid.

In this constitution, the mass composition ratio of the solidifying agent and the combustible liquid is the former / the latter = about 30/70 to 60/4.
0, preferably about 35/65 to 55/45, and more preferably about 40/60 to 50/50. If the content of the solidifying agent is too small, the candle becomes soft and the storability is deteriorated. On the other hand, if the content of the flammable liquid is too small, the burning action which is the original purpose of the candle is hindered.

(4) Another composition of the present invention for a transparent candle is characterized in that a flammable liquid contains a saturated alcohol having a branched structure as a modifier.

The difference from the composition described in (3) above is that the saturated alcohol was added as a modifier, not as the main component of the flammable liquid.

That is, in the case of this constitution, as the solidifying agent,
In some cases, conventionally used dextrin fatty acid ester, metallic soap (aluminum 2-ethylhexanoate, etc.), polymer elastomer, etc. are contained.

The flammable liquid may also include conventionally used unsaturated alcohols, unsaturated fatty acids, linear saturated alcohols, alcohol ethylene oxide adducts, fatty acid ethylene oxide adducts, and the like.

Also in this constitution, by incorporating the above-mentioned saturated alcohol in the conventional transparent candle composition as an improving agent, the respective drawbacks of the conventional transparent candle can be further improved.

(5) The transparent candle of the present invention is a transparent candle obtained from the above-mentioned composition for transparent candles, which is characterized by having a hardness which is self-supporting. Since the transparent candle of the present invention becomes a hard gel by being produced from the above composition, it has good storage stability and is easy to use.

The solid transparent candle may be appropriately blended with various compounding agents generally used for candles, as long as various properties such as transparency and self-supporting property are not impaired.

Further, as the other additive, a fragrance, a colorant, an antioxidant, a stabilizer, an insect repellent, a flame retardant and the like may be blended to add a further function to the candle. In particular, since the transparent candle of the present invention has excellent light resistance, it does not discolor even if it is lightly colored, and can contribute to further improvement in designability.

(6) The solid transparent candle of the present invention can be produced, for example, by the following method.

The solidifying agent is heated to a temperature above the softening temperature to give a liquid, which is made compatible with a flammable liquid to give a mixture, which is then poured into a mold and solidified by cooling to room temperature.

The above mixture forms a candle body.
When the solidifying agent (polymerized fatty acid-based polyamide) is thermally swelled in a flammable liquid (higher alcohol) to make them compatible with each other, if the liquid paraffin is previously compatibilized with the flammable liquid, the liquid paraffin becomes a polymerized fatty acid-based compound. Easily compatible with polyamide. That is, liquid paraffin, which is cheaper than other raw materials, can be used in the transparent candle formulation.

The viscosity of the liquid paraffin used at this time (Saybolt viscosity) is preferably around 100 to 500 SUS. If the viscosity is too low, the surface of the candle tends to become sticky due to sweating. On the other hand, if the viscosity is too high, compatibility will be a problem. Further, if the amount of liquid paraffin added is about 30% or less based on the total composition ratio, stable molding is possible. In addition, it has been confirmed that there is no change in flammability due to this composition, and stable combustion is possible.

Here, the composition of the candle body can be partially changed according to the required characteristics. For example,
The central part (near the core) has a composition with good flammability (as a polymerized fatty acid polyamide, acid value: about 5 mgKOH / g or less, total amine value: about 3 mgKOH / g or less, melt viscosity: about 150-30
0 mPa · s), the outer part (near the surface) has excellent sweating resistance and does not cause cracking (polymerized fatty acid polyamide, acid value: about 20.0 mgKOH / g, total amine value: about 0.3 mgKOH / g or less, melt viscosity: about 500 to 1
If a candle body with a structure of 000 mPa · s is used, it is possible to obtain a candle that has better flammability and sweat resistance.

The candle core may be dipped and fixed in the composition before the mixture is solidified, or may be embedded separately after the composition is solidified.

As the material for the candle core, it is possible to use a plant fiber such as hemp or cotton which is usually used as a candle core.

[0065]

EFFECT OF THE INVENTION The composition for transparent candles of the present invention has the above-mentioned constitution, and it is possible to obtain transparent candles having good heat resistance and light resistance, having hard physical properties, and being self-supporting. Therefore, it is possible to obtain a candle having better storage stability than the conventional one. In addition, it does not require an auxiliary container or the like at the time of combustion, and does not generate oily smoke (black smoke, soot), unpleasant odor, etc., and is therefore easy to use. Further, at the time of manufacturing, since the composition is simple, the manufacturing is easy, and high temperature treatment or the like is not required. There is also the advantage that the material is cheap and economical.

[0066]

EXAMPLES Examples which were carried out to confirm the effects of the present invention will be described below. The following examples are merely examples, and it goes without saying that the scope of the present invention is not limited to the following configurations.

Comparison of Physical Properties by Composition Ratio Polymerized fatty acid polyamide and saturated alcohol were mixed in the respective ratios shown in Table 1 to obtain a transparent candle composition having a two-component composition. A transparent candle was produced from the composition for a candle by the production method of the present invention. The heating condition of the polymerized fatty acid polyamide is about 100 to 150 ° C for about 30 minutes.
And

As the polymerized fatty acid type polyamide,
Acid value: 5 mgKOH / g or less, total amine value: 3 mgKOH / g or less,
Melt viscosity: 150 to 300 mPa · s, and a polymerized fatty acid-based polyamide specified by the chemical formula described in the detailed description of the invention was used.

As the higher alcohol, a mixture of saturated primary alcohols shown in <Chemical Formula 1> having a side chain structure and having 24, 25, 26 carbon atoms was used.

[0070]

[Table 1]

As a result, the transparent candles of Examples 1 and 2 had a slightly small flame but burned stably and had less stickiness.
It was tough and independent. Further, the combustion was good, and no generation of soot or unpleasant odor was observed.

On the other hand, the transparent candles of Comparative Examples 1 and 2 in which the content of the polymerized fatty acid polyamide was small, the perspiration of the oil was conspicuous and was very sticky. It was also soft and easily deformed.

On the contrary, the transparent candle of Comparative Example 3 containing a large amount of the polymerized fatty acid polyamide has a considerably small flame and spontaneously extinguishes after standing for several hours during combustion.
The core was wound, and stable flammability could not be obtained.
Further, due to the heat of the flame during combustion, the liquid surface portion became darker due to the poorly burned tar adhering to the core yarn.

Comparative Example 4, in which the content of the polymerized fatty acid polyamide was further increased, was extremely difficult to ignite and failed to function as a candle.

2 Physical properties when using the composition Next, the composition for candles used in Example 1 was used in the portion close to the inner core, and the acid value was 20.0 mgKOH / g and the total amine value was 0. 3 mgKOH / g or less, melt viscosity: 500 to 1000
A candle composition obtained by mixing 60% of a mPa · s polymerized fatty acid-based polyamide with 40% of the higher alcohol used in the above Examples and Comparative Examples was used as an outer portion (surface portion).
The two-layer candle used in the above was manufactured by the manufacturing method of the present invention.

As a result, a candle having excellent shape-retaining property, burning condition, surface stickiness, and transparency could be obtained.

Claims (13)

[Claims] 1. A composition for a transparent candle containing a solidifying agent and a flammable liquid as essential components, wherein the solidifying agent is mainly composed of a polymerized fatty acid-based polyamide compatible with the flammable liquid. A composition for transparent candles, wherein the flammable liquid is mainly composed of a saturated alcohol having a branched structure. 2. The composition for a transparent candle according to claim 1, wherein the saturated alcohol is a higher monohydric alcohol. 3. The saturated alcohol is a higher monohydric alcohol having 20 or more carbon atoms.
The composition for transparent candles as described. 4. The softening temperature of the polymerized fatty acid-based polyamide is about 130 ° C. or lower, and the flash temperature of the saturated alcohol is about 170 ° C. or higher.
The composition for transparent candles according to 2 or 3. 5. The composition for transparent candles according to claim 4, wherein the polymerized fatty acid-based polyamide has a softening temperature of about 100 ° C. or lower, and the saturated alcohol has a flash temperature of about 200 ° C. or higher. 6. The mass composition ratio of the solidifying agent and the combustible liquid is the former / the latter = about 30/70 to 70/30, wherein the mass composition ratio is about 30/70 to 70/30. The composition for transparent candles according to item 5. 7. A composition for a transparent candle containing a solidifying agent and a combustible liquid as essential components, wherein the combustible liquid contains a saturated alcohol having a branched structure as a modifier. A composition for transparent candles. 8. The composition for a transparent candle according to claim 7, wherein the saturated alcohol is a higher monohydric alcohol. 9. The saturated alcohol is a higher monohydric alcohol having 20 or more carbon atoms.
The composition for transparent candles as described. 10. The method according to claim 1, 2, 3, 4, 5, 6, 7,
A transparent candle obtained from the composition for transparent candles according to 8 or 9, wherein the transparent candle has a hardness having self-supporting property. 11. The polymerized fatty acid-based polyamide used near the core has an acid value of about 5 mgKOH / g or less, a total amine value of about 3 mgKOH / g or less, a melt viscosity of about 150 to 300 mPa · s, and a surface. Polymerized fatty acid polyamide used in the vicinity has an acid value of about 20.0 mgKOH / g and a total amine value of about 0.3.
The solid transparent candle according to claim 10, characterized in that it has a melt viscosity of about 500 to 1000 mPa · s at a mgKOH / g or less. 12. A method for producing a solid transparent candle according to claim 10 or 11, wherein the solidifying agent is heated to a softening temperature or higher to be a liquid, and is made compatible with the flammable liquid to form a mixture. After that, the mixture is poured into a mold and cooled to room temperature to be solidified, so that a solid transparent candle is produced. 13. The method for producing a solid transparent candle according to claim 12, wherein liquid paraffin is made compatible with the flammable liquid and then made compatible with the solidifying agent. Manufacturing method.