JPS6093B2 - Method for producing oil-based gel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing an oily gel useful as a base for cosmetics and external medicines.

Solidified liquid paraffin can remain on the skin for a long time without being washed away even when applied to the skin by itself, so if it is used with cosmetics or external medicines, it can cause emulsification etc. It can be easily formulated without requiring any special measures.

As this type of external pharmaceutical base made of solidified liquid paraffin, for example, "Plastibase" (registered trademark) developed by Spub Company in the United States is known.

This product has a structure in which liquid paraffin is trapped in a polyethylene matrix by melting liquid paraffin into polyethylene at a high temperature of 100°C or higher and then instantaneously cooling it. be. As a result of extensive research aimed at providing a method for solidifying liquid paraffin with a simpler process without using polyethylene, the inventor added a hydrogenated lecithin to liquid paraffin and melted it by heating. The present invention was completed based on the discovery that the liquid paraffin solidifies into a gel when left to cool, and that this gel can be effectively used as an oily base for cosmetics and external medicines.

Lecithin is a phospholipid widely distributed in the animal and plant kingdoms, and in the present invention, hydrogenated lecithin is used.

As the raw material lecithin, it is sufficient if it has been purified to about 70% phospholipid content, and there is no need to use highly purified lecithin. Further, regarding the degree of hydrogenation of lecithin, it is not necessary to completely hydrogenate the lecithin, and a gel can be sufficiently formed even if the lecithin is hydrogenated to a degree of iodine value of 2. When carrying out the present invention, hydrogenated lecithin is added to liquid paraffin and mixed uniformly, and approximately 60%
The hydrogenated lecithin may be dissolved by overflowing to about qo, and then allowed to cool.

An almost transparent gel can be formed by such a simple operation. A gel can be formed by adding hydrogenated lecithin in an amount of about 5 parts by weight per 100 parts by weight of liquid paraffin. fluidization temperature increases.

When added in an amount of about 10 to 15 parts by weight, a gel having a fluidization temperature of about 40° C. is formed, and such a gel is suitable for use as a base for cosmetics applied to the skin and external medicines. In the present invention, in addition to liquid paraffin, squalane and Q
Hydrocarbon oils such as olefin oligomers and fluid polyisobutylene can be used alone or in combination of two or more thereof. In addition, vegetable oils such as olive oil that do not form gels alone, or liquid higher fatty acid esters such as isopropyl myristate, can be mixed with the same amount or more of the above-mentioned hydrocarbon oil such as liquid paraffin and used as a liquid oil mixture. , it becomes possible to individualize it into a gel-like state. When using the oily gel according to the present invention as a base for external medicines, after dissolving or dispersing the d medicine in a hydrocarbon oil such as liquid paraffin or the above liquid oily mixture, hydrogenated lecithin is added and solidified into a gel. The resulting gel can be directly filled into a tube or the like and used as an ointment.

These ointments contain hydrogenated lecithin, which has surface-active properties, in addition to medicinal oil-based substances, so they can be applied effectively to the wound skin surface from which interstitial fluid and other fluids leak. Furthermore, since the main component of ointments is a fluid oily substance, the medicines contained therein are also easily released. On the other hand, when applying the oil-based gel according to the present invention to cosmetics,
This oil-based gel with fragrance added thereto can be used for hair treatment, and if this oil-based gel is used for surface treatment of powder used in makeup cosmetics, pancakes can be produced with less molding pressure than before.

The pancakes thus obtained are easy to take out with a puff or the like, and are easy to spread on the surface of the skin. The present invention will be further explained with reference to Examples below. All "parts" in the examples are parts by weight. Example 1 Soybean lecithin (phospholipid content: 80%) was hydrogenated to reduce the iodine value from 82.5 to 30.3.

10 parts of liquid paraffin was mixed with 1 part of the hydrogenated soybean lecithin obtained above, and the mixture was flooded with 6,000 ml of liquid paraffin and left to cool to obtain an almost transparent liquid paraffin gel. The fluidization temperature of this gel was about 400C. Example 2 To a mixture consisting of 4 parts of isopropyl myristate and 6 parts of liquid paraffin, 15 parts of the hydrogenated soybean lecithin used in Example 1 above was added and the mixture was perfused to 60 oz.
After further addition of 50% of the mixture and mixing uniformly, the mixture was allowed to cool to obtain an almost transparent gel.

This gel was filled into a tube to produce a 5% salicylic acid ointment. Example 3 Soybean lecithin (phospholipid content 85%) had an iodine value of 84.
Hydrogenation was performed to reduce the value from 0 to 21.5.

1 part of the hydrogenated soybean lecithin obtained above and 1 part of fragrance were added to a mixture consisting of 5 bales of camellia oil and 5 parts of liquid paraffin, and after flooding to 60 q0, it was allowed to cool and form a transparent gel. Manufactured hair styling products. Example 4 15 parts of the hydrogenated soybean lecithin used in Example 3 was added to a mixture consisting of 4 parts of isopropyl myristate and 6 parts of liquid paraffin, and the mixture was flooded to 6,000 ml.
Titanium oxide 50 Ikarito, Karion 30 Somari and Talc 2
A mixed powder consisting of 0 parts was added, mixed uniformly and allowed to cool, and the powder surface was coated with an oily gel.

Pigments and fragrances were mixed with this powder and then compression molded to produce pancakes. Example 5 20 parts of hydrogenated soybean lecithin used in Example 3 above was added to 6
The mixture was added to 100 parts of squalane flooded with 000 and made uniform, and then poured onto a stainless steel plate previously cooled to 000 to a thickness of about 20 mm, and cooled to obtain a transparent oil-based gel.

Example 6 15 parts of the hydrogenated lecithin used in Example 1 was homogenized with 5 parts of liquid paraffin and 5 parts of Q-olefin oligomer (average molecular weight 435) at 6,000 ml, and then mixed with 5 parts of butyl para-aminobenzoate. of the oily gel to obtain a cooled oily gel-like sunscreen ointment.

Example 7 Soybean lecithin (80% phospholipid content) with an iodine value of 81.
Hydrogenation was carried out so that the concentration ranged from 0 to 17.5.

To 2 parts of this hydrogenated lecithin, 8 parts of liquid polyisobutylene (average molecular weight approximately 250) was added and heated to 6500 °C to uniformly dissolve, and then 10 parts of titanium oxide was added to 5 parts of this liquid.
0 parts were added, mixed uniformly, and allowed to cool to obtain treated titanium oxide powder in which the surface of the titanium oxide was coated with an oily gel. This powder is suitable for a speckling agent produced by isopressure vertical molding of a power cake.

Claims (1)

[Claims] 1 100 weight of a hydrocarbon oil consisting of liquid paraffin, squalane, α-olefin oligomer or liquid polyisobutylene alone or in combination of two or more, or a liquid oily mixture prepared by mixing the hydrocarbon oil with the same amount or less of vegetable oil or liquid higher fatty acid ester 1. A method for producing an oil-based gel, which comprises adding at least 5 parts by weight of hydrogenated lecithin to a part, dissolving it by heating, and then allowing it to cool.