JP2866012B2 - Oxygen-permeable hard contact lens cleaner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning agent used for cleaning contact lenses, particularly hard contact lenses having oxygen permeability.

[0002]

2. Description of the Related Art Conventionally, chlorine-based cleaning agents have been used for cleaning oxygen-permeable hard contact lenses as in general contact lenses. This is because the chlorine-based detergent has a high degreasing power and a high protein resolution, and removes dirt in a short time. However, chlorine is dangerous because it causes irritation to the eyes and causes irritation of the eyes. Before wearing, the contact lenses must be thoroughly washed with water, and handling is troublesome. For this reason, enzyme-based detergents have recently been developed from the viewpoint of safety. This removes dirt using the proteolytic activity of the enzyme.

[0003]

However, while the enzymatic cleaning agent performs gentle cleaning, it has a problem in that the detergency such as degreasing property is inferior to that of the chlorine-based cleaning agent, and dirt cannot be sufficiently removed. In particular, since the oxygen-permeable contact lens can be worn for a long period of time, dirt easily adheres and adheres firmly. Therefore, at present, oxygen-based cleaning agents do not sufficiently act on oxygen-permeable contact lenses. The present invention has been made in view of the above circumstances, and provides a cleaning agent which is highly safe, has a detergency capable of sufficiently removing dirt from an oxygen-permeable hard contact lens, and has good handleability. The purpose is to do.

[0004]

Means for Solving the Problems In order to solve the above problems,
Contains percarbonate, proteolytic enzymes and surfactants,
The percarbonate is formed into granules, and the granulated percarbonate is coated with a water-soluble coating agent to prevent and stabilize the decomposition, and is used in an oxygen-permeable hard contact lens dissolved in water. Cleaning agent.

[0005]

In the present invention, the percarbonate is a peroxocarbonate in which hydrogen peroxide is coordinated to the carbonate. This percarbonate is stable in the dry state, but decomposes rapidly when dissolved in water to produce hydrogen peroxide. Oxygen is released from the hydrogen peroxide, and the free oxygen decomposes organic substances. This is effective for removing lipids. As such percarbonate, one or more of potassium percarbonate and sodium percarbonate can be used. Na for sodium percarbonate
₂ CO ₃ .H ₂ O ₂ , Na ₂ CO ₃ .2 / 3H ₂ O _{2 and} other chemical formulas can be selected. The mixing ratio of the percarbonate is determined from the concentration at the time of dissolving in water since the detergent of the present invention is used by dissolving it in water. For example,
When sodium percarbonate is used as the percarbonate, 0.1 to 5.0%, preferably 1.0 to 3.0% when dissolved in water.
The mixing ratio is set so that the concentration becomes%.

[0006] Proteolytic enzymes degrade proteins by their proteolytic activity. As the protease, one or more of subtilisin, trypsin and the like can be selected. Proteolytic enzymes alone degrade proteins, but the present invention is characterized in that it is used together with percarbonate. That is, the above-mentioned protease has a remarkably enhanced protein resolution in the presence of percarbonate. Although the rationale for this is not clear, it is possible to directly attack proteins because oxygen generated from percarbonate enhances enzyme activity and percarbonate decomposes lipids, which are difficult for proteolytic enzymes to decompose. It seems to be because. In any case, in the coexistence with percarbonate, the detergent of the present invention can strongly remove dirt from the empirical rule that the protein resolution is synergistically enhanced. The mixing ratio of this protease is also determined on the basis of dissolution in water, and in the case of subtilisin, 0.0001 units / ml in an aqueous solution.
It is formulated so as to have a degrading enzyme activity of 0.01 unit / ml.

[0007] Surfactants promote contact between contact lenses and water due to their surface activity. The cleaning object of the cleaning agent of the present invention is an oxygen-permeable hard contact lens,
This contact lens has hydrophobicity. Surfactants improve the wettability of the hydrophobic contact lens surface and make contact between the lens surface and water. As a result, the percarbonate and the protease in the aqueous solution effectively act on the lens surface to remove dirt. As such a surfactant, a nonionic surfactant is preferable from the viewpoint of irritation to the eye, and a bruronic surfactant (trade name) is particularly effective. The mixing ratio of the surfactant is about 10%, and is not particularly limited. The cleaning agent of the present invention may contain a neutralizing agent for the above compound. The addition of the neutralizing agent neutralizes the liquid property or makes it weakly alkaline, so that there is an advantage that the contact lens can be used as it is as a preservative solution after washing. As the neutralizing agent, sodium thiosulfate or the like can be selected.

[0008] The cleaning composition of the present invention is supplied in the form of granules having the above composition. At the time of use, the contact lens is dissolved in one of the above-mentioned various types of water, and the contact lens is immersed in the aqueous solution and left overnight (for example, for 6 to 8 hours) for washing. By this immersion, not only the dirt on the lens surface can be removed, but also the coloring inside the lens can be bleached. Further, the lens does not discolor even when used over time. When supplied as granules, percarbonate may be decomposed or the activity of decomposing protease may be reduced due to mutual contact of the compounds. For this reason, each compound may be individually packaged, dissolved and mixed in purified water at the time of use. The present invention is not limited to this, and in the present invention, a capsule in which one or both of a percarbonate and a protease can be coated with a water-soluble coating agent. FIG. 1 shows an example of this capsule, in which an inner layer 1 is filled with percarbonate or a protease, and an outer layer 2 surrounding the inner layer 1 is composed of a water-soluble coating agent. In the present invention, the dissolution time can be adjusted by appropriately changing the thickness of the outer layer 2. Ie percarbonate,
The time at which the protease is effective is adjusted by the thickness of the outer layer 2. FIG. 2 shows another example of the capsule, which has four layers as a whole. The innermost first layer 3 is filled with one of a percarbonate and a protease, and the intermediate third layer 5 is filled with the other. And these compounds are the second layer 4 composed of a water-soluble coating agent.
To prevent mutual contact, and these are entirely wrapped by the fourth layer 6 made of a water-soluble coating agent. FIG. 3 shows still another example of the capsule, which is composed of two types, a first capsule 10 and a second capsule 20, and a predetermined amount of these capsules 10, 20 is the bag 3
0. In the first capsule 10, an inner layer 11 is filled with percarbonate, and the inner layer 11 is wrapped in an outer layer 12 made of a water-soluble coating agent. The second capsule 20 is a small capsule 21 filled with a protease.
And small capsules 22 filled with a neutralizing agent such as sodium thiosulfate are filled in appropriate amounts, respectively, and these small capsules 21 and 22 are entirely surrounded by an outer layer 23 made of a water-soluble coating agent. The small capsules 21 and 22 in the second capsule 20 have the same two-layer structure as the first capsule 10 or the capsule shown in FIG. In the capsule shown in FIG. 3, the first capsule 10 is dissolved at the beginning of contact with water (for example, after 15 seconds), and then the second capsule 20 is dissolved after a predetermined time (for example, 30 minutes). And the respective capsules 10 and 20
The thickness of the outer layers 12 and 23 is adjusted. As a result, the organic substance containing the protein is decomposed by the action of the percarbonate until it has a simple structure, and in this state, the protease acts on the organic substance, so that the protein can be surely decomposed and the washing property is improved. As the bag body for encapsulating these capsules 10 and 20, a sheet material in which an aluminum foil and a plastic film are laminated is used. Inactivation of the enzyme can be prevented. As the water-soluble coating agent in these cases, HPMC (hydroxypropylmethylcellulose) PEG (polyethylene glycol), HEC (hydroxyethylcellulose) or gelatin can be appropriately selected.

[0009]

EXAMPLE As sodium percarbonate (Na ₂ C)
O ₃ . 2 / 3H ₂ O ₂ ), subtilisin (trade name “subtilisin A”) as a proteolytic enzyme, trade name “Emulgen PP-290” (Kao Corporation) as a surfactant
Sodium thiosulfate (Na ₂ S ₂ O)
₃ · 5H 2 _O) were selected and formulated detergent by the following Formulation Examples. In this case, the subtilisin A and sodium thiosulfate used were those coded with HPMC having a thickness of 1 μm or more. This coating film is 20-30
It dissolves in water in about a minute. (Prescription example) Sodium percarbonate 70.0 mg Subtilisin A 2.0 mg Emulgen PP-290 20.0 mg Sodium thiosulfate 88.0 mg Total amount 180.0 mg Artificial protein stain 3 ml of oxygen-permeable hard contact lens with artificial lipid stain attached Was immersed in purified water, and 0.2 g of the above-mentioned cleaning agent was added to and dissolved in the purified water. Immediately after dissolution, foaming was performed for 30 seconds, and generation of oxygen was confirmed. In addition, the whole amount was melted smoothly and there was no residue, and the pH was 10. Then, the state of removal of these stains was observed over time. Table 1 shows the detergency for artificial protein stains, and Table 2 shows the detergency for artificial lipid stains. In these tables, the larger the number of “+”, the larger the amount of adhered dirt, and “−” indicates that the adhered dirt is eliminated. Comparative Examples A and B were similarly cleaned with a chlorine-based detergent and an enzyme-based detergent, respectively.

[0010]

[Table 1]

[0011]

[Table 2]

Table 3 shows the characteristics of each cleaning agent in consideration of the above cleaning results, where "OO" is excellent, "O" is good,
“△” indicates slightly, and “×” indicates no. "Internal coloring"
Indicates the ability to remove the internal coloring of the contact lens, and “discoloration” indicates the degree of transparency deterioration of the lens surface.

[0013]

[Table 3]

[0014]

The cleaning agent of the present invention removes lipids and proteins by using percarbonate and proteolytic enzymes, so that the oxygen-permeable hard contact lens can be surely cleaned. In addition to being highly safe, it is easy to handle due to the granular form, and the washing operation is simple.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a coating.

FIG. 2 is a cross-sectional view showing another example of a coating.

FIG. 3 is a state diagram showing yet another example of coating.

[Explanation of symbols]

 1 inner layer 2 outer layer

Claims (2)

(57) [Claims] The present invention comprises a percarbonate, a protease, and a surfactant, wherein the percarbonate is formed into granules, and the granules are formed into at least a two-layer structure coated with a water-soluble coating agent. A cleaning agent for an oxygen-permeable hard contact lens, comprising: 2. The oxygen-permeable hard contact lens cleaning agent according to claim 1, wherein the percarbonate is sodium percarbonate, the protease is subtilisin, and the surfactant is a nonionic surfactant. Agent.