JPS6363884B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a liquid lens cleaner, and more particularly to a liquid lens cleaner that has a lasting anti-fogging effect and prevents interference colors due to residual oil film. Conventionally, various silicones have been used as liquid lens cleaners because ordinary alcohols have an adverse effect on resins forming eyeglass frames. However, although conventional liquid lens cleaners have excellent cleaning effects, anti-fogging properties, and antistatic properties (preventing dust adhesion) immediately after application, these effects are lost within a relatively short period of time and are not sustainable. This is unsatisfactory, and furthermore, an oil film appears after the lens surface comes into contact with water vapor after wiping.
It has a serious drawback in that it causes interference color of the oil film and gives an unpleasant feeling such as so-called glare. The present inventors have found that when a polyether-modified organopolysiloxane having a refractive index in the range of 1.452 to 1.462 is used as a component of a cleaner, the durability of the anti-fogging properties and antistatic properties described above is significantly improved, and It has been found that the interference color of the oil film, that is, the glare of the oil film can be prevented. That is, an object of the present invention is to have significantly superior cleaning effect, anti-fogging properties and long-lasting effects, and long-lasting antistatic properties, etc., as compared to conventional liquid lens cleaners, and to reduce the interference color of the remaining oil film after wiping. That is, the object of the present invention is to provide a liquid lens cleaner in which the glare of an oil film is prevented. According to the present invention, there is provided a liquid lens cleaner comprising an aqueous solution of a polyether-modified organopolysiloxane having a refractive index in the range of 1.452 to 1.462, a nonionic surfactant, and a water-soluble polyhydric alcohol. One of the important features of the present invention is that the refractive index of the water-soluble silicones to be dissolved in the aqueous medium is
The purpose is to select a polyether-modified organopolysiloxane within the range of 1.452 to 1.462.
Polyether-modified organopolysiloxane has a chemical structure in which an organopolysiloxane block and a polyether block are combined. Due to the presence of the hydrophilic polyether block, these silicones are water-soluble, and due to the presence of the organopolysiloxane block, they exhibit an excellent ability to form a film on the lens surface. Furthermore, the silicones used in the present invention have a hydrophilic group and a lipophilic group, and thus exhibit surface activity, and this surface activity exhibits an anti-fogging effect and an antistatic effect. In this polyether-modified organopolysiloxane, as the proportion of organopolysiloxane blocks increases, its refractive index increases, while as the proportion of polyether blocks increases, its refractive index decreases. In the present invention, by selecting a polyether-modified organopolysiloxane whose refractive index is within a certain range, that is, within the range of 1.452 to 1.462, it is possible to sustainably obtain antifogging properties and antistatic effects. This is a remarkable feature.
That is, when the refractive index is within the above range, it becomes possible to firmly bond a silicone coating with excellent anti-fogging properties and antistatic properties to the lens surface. Silicones with a refractive index larger than the above range have unsatisfactory anti-fog properties and antistatic properties, while silicones with a refractive index smaller than the above range lack sustainability of these properties. Furthermore, the most remarkable feature of the present invention is that by using polyether-modified organopolysiloxane with a refractive index of 1.452 to 1.462, the formation of an oil film with interference colors on the lens surface is prevented, and such glare is prevented. This means that the occurrence of this phenomenon is suppressed for a relatively long period of time. The occurrence of glare from the oil film in conventional lens cleaners is caused by the fact that water-soluble components such as nonionic surfactants and polyhydric alcohols contained in the cleaner are gradually lost from the lens surface, leaving a coating made only of silicones on the lens surface. This is thought to be the cause. In contrast, in the present invention, the refractive index of the silicone is maintained in the range of 1.452 to 1.462, which is extremely close to the refractive index of the lens (for example, the refractive index of quartz glass, 1.4588), so such interference colors occur. is expected to be suppressed. The polyether-modified organosiloxane used in the present invention preferably has a viscosity of 1,000 to 4,000 centistokes, particularly 1,700 to 3,000 centistokes at 25°C. That is, if this viscosity is smaller than the above range, the durability of anti-fogging and antistatic properties tends to decrease, and if this viscosity is larger than the above range, the silicone coating will not adhere to the lens. There is a tendency for the accumulation to become large and cause glare. In the polyether-modified organopolysiloxane, the organopolysiloxane block can be composed of a dimethylpolysiloxane block, a methylphenylpolysiloxane block, a diethylpolysiloxane block, a methylhydrogen polysiloxane block, or a combination thereof; The blocks can be comprised of polyoxyethylene blocks, polyoxypropylene blocks or combinations thereof. The polyether blocks are bonded to the silicon atoms of the organopolysiloxane blocks via oxygen atoms or directly via alkylene groups. The quantitative ratio of the organopolysiloxane block and the polyether block is determined so as to have the above-mentioned refractive index, and the refractive index can also be adjusted by blending a plurality of types of polyether-modified organopolysiloxanes. In the present invention, in addition to the silicones described above, a nonionic surfactant and a water-soluble polyhydric alcohol are used in order to improve the wettability and cleaning performance of the lens surface. In this case, the use of a nonionic surfactant as a surfactant is still very effective in preventing the formation of a glittery interference film, and anionic surfactants do not have the expected effects intended by the present invention. Can not. As the nonionic surfactant, all known nonionic surfactants can be used, such as polyoxyethylene monolaurate, polyoxyethylene alkyl ether, polyoxyethylene nonylphenol ether, polyoxyethylene sorbitan monolaurate, Coconut oil fatty acid diethanolamide and the like are preferably used. The most excellent nonionic surfactant from the viewpoint of anti-fog effect and its sustainability is one with an added amount of ethylene oxide of 7 to 7.
It is a polyoxyethylene alkyl phenol ether within the range of 12 moles, where the alkyl group is an octyl group, a nonyl group, etc. having a carbon number of 8 to 8.
Twelve alkyl groups are preferred. As the polyhydric alcohol, glycerin is most preferred, but propylene glycol, ethylene glycol, diethylene glycol, etc. can also be used. In the present invention, the above-mentioned polyether-modified organopolysiloxane per 100 parts by weight of the aqueous solution is
0.5 to 4 parts by weight, especially 1 to 3 parts by weight, nonionic surfactants 0.5 to 4 parts by weight, especially 1 to 3 parts by weight, and water-soluble polyhydric alcohols 0.1 to 3 parts by weight.
It is used in an amount of 10 parts by weight, especially 0.5 to 5 parts by weight. That is, when the amount of polyether-modified organopolysiloxane is less than the above range, the anti-fogging effect, antistatic effect and their sustainability are unsatisfactory, and when it is more than the above range, the formation of a shiny oil film is unsatisfactory. It becomes unsatisfactory. The amounts of the nonionic surfactant and polyhydric alcohol are determined within the above ranges so as to meet the first objective of the present invention. In addition to the above-mentioned essential components, the liquid cleaner of the present invention may contain auxiliary components known per se, such as antibacterial agents, antifungal agents, fragrances, and the like. The liquid cleaner of the present invention includes an aerosol container,
It can be used to clean the lenses of glasses, cameras, and other optical machines by filling it into a drip-type container or impregnating paper, nonwoven fabric, etc. The invention is illustrated by the following example. Example 1 The following four types of polyether-modified organopolysiloxanes manufactured by Shin-Etsu Silicone Co., Ltd. are used as water-soluble silicones. Silicones Refractive index Viscosity (25℃) (1) 2 parts by weight of polyoxyethylene nonylphenol ether (ethylene oxide 9 mol adduct) per part,
Add 1 part by weight of glycerin, 2 parts by weight of biocide (antibacterial agent), and water to make 100 parts by weight, and use them as samples 1, 2, 3, and 4, respectively. The above samples 1 to 4 were tested for anti-fogging properties, anti-fogging durability, cleaning effect, resistance to dust adhesion, and interference color of oil film using the following methods, and the results are shown in Table 1. In addition, similar tests were conducted on commercially available products A, B, and C.
They are also shown in Table 1. Anti-fog property Washed and rinsed glass plate (20cm x 5cm)
Using a metering pump, wipe off a certain amount of each sample solution with a tissue paper, and use it as a test glass plate. Each test glass plate was placed side by side on an electric water bath where steam was generated, and the degree of cloudiness (heat rash phenomenon) was observed and evaluated as shown below. Something that prevents fogging to a satisfactory degree...
……〇 Slightly prevented…△ Almost no fogging prevention… × Sustainability of fogging prevention Anti-fogging tests were conducted every day for each sample glass plate used in the anti-fogging property test. The changes in anti-fogging properties over time were observed and shown in the evaluation below. Items that maintain anti-fogging properties for 7 days or more...
◎ Items that maintain anti-fogging properties for 4 to 5 days...
…〇Those whose anti-fogging properties are maintained for 2 to 3 days…
…△ Anti-fogging property is unsatisfactory from the beginning…… × Cleaner effect Use a dirty glass plate (20 cm x 5 cm), wipe a certain amount of each sample solution with a metering pump, and wipe the glass surface with tissue paper. Then, observe the degree of stain removal and give the following evaluation. A glass plate with a satisfactory level of dirt removal. Leave the glass plate indoors,
The degree of dust adhesion was observed and evaluated as shown below. Satisfactory...〇 Slightly dusty...△ Dusty easily...× Interference color of oil film Prepare a test glass plate for each sample liquid in the same way as the anti-fogging property test, and After wiping the surface with tissue paper, the glass surface was observed and evaluated as shown below. The interference color of the oil film is not observed at all...◎ The interference color of the oil film is slightly observed, but it is not noticeable......〇 The interference color of the oil film is slightly observed...△ The interference color of the oil film is Observed in a dazzling state...
...×

[Table] From the results, the lens cleaner prepared using polyether-modified organopolysiloxane having a refractive index within the range of the present invention has excellent effects such as anti-fogging properties, and has excellent durability. It is understood that no interference color of the residual oil film is observed. Example 2 Sample solutions were prepared according to the formulations shown in Table 2 below and subjected to the same test as in Example 1, and the results are shown in Table 3.

【table】

【table】

Claims (1)

[Claims] 1. A liquid lens cleaner comprising an aqueous solution of a polyether-modified organopolysiloxane having a refractive index in the range of 1.452 to 1.462, a nonionic surfactant, and a water-soluble polyhydric alcohol. 2. A patent in which the polyether-modified siloxane is present in an amount of 0.5 to 4 parts by weight, the nonionic surfactant is present in an amount of 0.5 to 4 parts by weight, and the water-soluble polyhydric alcohol is present in an amount of 0.1 to 10 parts by weight, per 100 parts by weight of the aqueous solution. A cleaner according to claim 1. 3 The polyether-modified siloxane at 25°C
The cleaner of claim 1 which is a polyorganosiloxane-polyether block copolymer having a viscosity of 1000 to 4000 centistokes. 4. The cleaner according to claim 1, wherein the water-soluble polyhydric alcohol is glycerin. 5. The cleaner according to claim 1, wherein the nonionic surfactant is an ethylene oxide adduct of 7 to 12 moles of alkylphenol.