JPH0820528A - Lubricant for condom - Google Patents

Abstract

PURPOSE:To obtain the subject readily water-soluble lubricant having such delicate viscosity as to develop cobwebbing and sags. CONSTITUTION:This lubricant, which is readily soluble in water, comprises a lubricating viscous agent, large amount of viscosity regulator and small amount of water. This lubricant contains a specified amount of a cellulose derivative of 400-1000 in average polymerization degree, therefore its viscosity standing at 200-2000cPs.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricant for a condom which is easily soluble in water. Lubricants for condoms are required to have penetrability that is easy to apply to condoms and viscosity that does not sag.

[0002]

2. Description of the Related Art As an invention of a lubricant for condom, "lubricant for condom" (Japanese Patent Laid-Open No. 184539/1993)
Can be mentioned. This involves reducing the amount of water used to dissolve polyacrylamide, which is commonly used as a lubricant and viscosity modifier, and mixing a large amount of glycerin to adjust the viscosity of the lubricant, which is increased by decreasing the amount of water. It is a thing.

The invention of "lubricants for condoms and others" (Japanese Patent Application No. 6-58707) is to add squalane to the lubricant. Unlike conventional silicone oil, it is slimy, has excellent lubricity and moisturizing properties, and it is water-soluble so that it feels very good to the touch, and the effect of physical property deterioration on the condom is also suppressed. Is.

[0004]

A lubricant for condoms containing squalane has succeeded in further improving the moisturizing and lubricating properties of a water-soluble lubricant. However, the squalane content of the lubricant is limited, and the viscosity of the lubricant that can be prepared is limited to a certain range. In particular, it was not possible to obtain a lubricant having a viscosity that does not easily sag.

Further, if the viscosity of the condom-containing lubricant for a condom is increased, the lubricity of the solution can be increased, but with this, a threading phenomenon occurs. The presence of string is not desirable as a lubricant in appearance.

The present invention provides a lubricant having a composition which can be easily adjusted to have a viscosity suitable for any application by adding a substance that does not cause stringing and appropriately combining the average degree of polymerization and the addition concentration. The purpose of the present invention is to obtain a lubricant and provide a lubricant that is hard to sag for condoms.

[0007]

According to the invention, the above-mentioned object is achieved by the means described in the claims.

That is, the invention of claim 1 is a lubricant which is easily soluble in water containing a lubricating viscosity modifier, a large amount of a viscosity adjusting agent, and a small amount of water, and has an average degree of polymerization of 400 to 1000.
Contains a predetermined amount of the cellulose derivative and has a viscosity of 200 to
It is a lubricant for condoms in the range of 2000.

A second aspect of the present invention is a lubricant for condoms, wherein the added concentration of the cellulose derivative is 4% or less to obtain a predetermined viscosity, and the third aspect of the invention is hydroxypropylmethylcellulose as the cellulose derivative. It is a lubricant for condoms using (HPMC).

Lubricants having various viscosities can be prepared by appropriately combining the average degree of polymerization of the cellulose derivative and the addition concentration. For example, when the addition concentration of the cellulose derivative is fixed at about 2% and the viscosity of the solution when the average degree of polymerization is changed is measured by a Brookfield viscometer, the average degree of polymerization of the cellulose body is 170.
At that time, the viscosity becomes 40 to 60 cps.

When the average degree of polymerization is 400, the viscosity is 200 to 300 cps, when the average degree of polymerization is 550, the viscosity is 800 to 1500 cps, and when the average degree of polymerization is 750, the viscosity is 3000 to 6000 cps. And the viscosity when the average degree of polymerization is 1000 is 8000 to 1
It will be 5000 cps. The measurement temperature is 20 ° C.

That is, the average degree of polymerization is 400 to 1000.
When the cellulose derivative of is used, the viscosity is 20 to 1500.
A wide range of solutions of 0 cps can be obtained. Therefore, the average degree of polymerization of the cellulose derivative is 4
If the range of 00 to 1000 is adopted, a lubricant having a viscosity suitable for a condom can be prepared. If a cellulose derivative having an average degree of polymerization of about 170 is used, the addition amount becomes large and it takes time to dissolve it.

In a condom lubricant, the viscosity is 20
0 to 2000 cps, preferably 500 to 2000
From the viewpoint that cps, more preferably 1000 to 1500 cps can be adopted, it is more preferable to add a predetermined amount of a cellulose derivative having an average degree of polymerization of 400 to 850.

In order to obtain a polymer having a lower viscosity, it is preferable to add a predetermined amount of the cellulose derivative having a small average polymerization degree or about 400. Further, in the case of obtaining a material that does not easily sag, it is preferable to add a predetermined amount of a cellulose derivative having an average degree of polymerization of more than 550 or about 750 to 850.

FIG. 1 shows an average degree of polymerization of 170,400,5.
It is a graph which shows an example of the correlation of the addition density of a cellulose derivative at the time of fixing to 50, or 850, and viscosity. The measurement temperature is 20 ° C. As shown in FIG. 1, if a cellulose derivative is added at 4% or less, several hundred to three
A viscosity of about 000 cps is obtained. Therefore, as the addition concentration of the cellulose derivative, 4% or less can be adopted first.

If the concentration of the cellulose derivative is higher than the above range, the permeability of the rolled-up condom becomes very poor.

A cellulose derivative having an average degree of polymerization of about 400 is added in the range of about 1.5 to 5%, preferably about 3 to 4%, and a cellulose derivative having an average degree of polymerization of about 550 is added to about 1 to 2.5%. Range of about 2 to 2.5% is added, and in the case of a cellulose derivative having an average degree of polymerization of about 750, a range of about 0.1 to 0.6%, preferably 0.25 to 0.
It can be prepared by adding 4%.

Since the viscosity of the lubricant is mainly determined by the average degree of polymerization of the cellulose derivative and the addition concentration, it goes without saying that the average degree of polymerization which can be obtained by interpolating the exemplified average degree of polymerization and Each addition concentration can be adopted.

[0019]

In the present invention, the cellulose derivative is used in place of polyacrylamide which has been conventionally used as a lubricating viscosity adjusting agent, so that even when the viscosity is high, it does not have a slimy feel with a stringiness, but is moist without a stringiness. A slimy feeling is obtained.

[0020]

EXAMPLES Table 1 illustrates specific formulation examples and the effects of the formulation examples.

[Table 1]

In the table, polyacrylamide is a lubricating viscosity adjusting agent and viscosity adjusting agent, squalane is a lubricating and moisturizing agent, and cellulose (HEC, HPMC) is a lubricating viscosity adjusting agent and viscosity adjusting agent. Glycerin and propylene glycol are viscosity modifiers, humectants, and skin softeners, parabens are preservatives, and water is purified water.

Instead of propylene glycol,
Glycerin or sorbitol may be used, glycerin and sorbitol may be used, or propylene glycol and glycerin or sorbitol may be used.

Further, in each of the formulation examples, the amount of water content is suppressed to 35% or less in consideration of the compatibility of the cellulose derivative and the condom. Furthermore, glycerin etc. will be used in large quantities. None of the combination examples showed deterioration of physical properties or discoloration (whitening phenomenon) with respect to condoms, and
It was confirmed that it is safe for the human body and there is no problem.

The cellulose derivatives include hydroxyethyl cellulose (HEC) and methyl cellulose (M
C), sodium carboxymethyl cellulose (CM
There are various types such as C), hydroxypropyl cellulose (HPC), and hydroxypropyl methyl cellulose (HPMC), so the characteristics will be compared.

HEC has good compatibility with salts and does not gel even at high temperatures. MC has a low surface tension of water and exhibits surface activity and is excellent in lubricity, but it gels at 50 to 60 ° C. and its compatibility with salts is not so good. CMC does not gel at high temperatures, but when added to a saline solution it precipitates and its viscosity is highly pH dependent. HPC lowers the surface tension of water and exhibits surface activity, but its compatibility with salts is not good. H
PMC does not easily gel when heated and does not precipitate even when mixed with salts.

From the viewpoint of gelation, HEC, C
It can be said that it is desirable to adopt MC or HPMC.
From the viewpoint of salt precipitation, it can be said that HEC or HPMC is preferably used. As the cellulose derivative, one having the most excellent properties is appropriately selected according to each application.

HPMC is the best for condoms. Since HPMC has a particularly high thixotropy among cellulose derivatives, it has a characteristic that it is difficult to sag, while being easy to fill. Therefore, the lubricant using HPMC has a high permeability, so that it can be easily applied to a condom, and there is no fear that the viscosity becomes high after packaging and sagging.

[0028]

As described above, according to the present invention,
With the composition excellent in the characteristics of mixing of the cellulose derivative and compatibility with the condom, the lubricant using the cellulose derivative is obtained, and therefore, no stringing that impairs the appearance is generated. Furthermore, by simply combining the average degree of polymerization and the addition concentration, it is possible to easily prepare a condom lubricant having a delicate viscosity that is hard to sag.

[Brief description of drawings]

FIG. 1 is a diagram showing a correlation between a concentration of cellulose added and a solution viscosity.

Claims (3)

[Claims] 1. A lubricating viscosity modifier, a large amount of viscosity adjusting agent, and a water-soluble lubricant containing a small amount of water, which contains a predetermined amount of a cellulose derivative having an average degree of polymerization of 400 to 1000, A condom lubricant having a viscosity in the range of 200 to 2000. 2. The lubricant for a condom according to claim 1, wherein the added concentration of the cellulose derivative is 4% or less to obtain a predetermined viscosity. 3. The lubricant for condoms according to claim 1, wherein hydroxypropylmethyl cellulose (HPMC) is used as the cellulose derivative.