JPH04129551A - Glasses having water absorptive porous body - Google Patents

Abstract

PURPOSE:To lighten the discomfortable feeling and symptoms of a dry-eye patient by constituting a part or the whole at least on the inside of a nonoptical part with the water-absorptive porous body having continuous air holes and installing the porous body in water-absorbed state. CONSTITUTION:A part or the whole at least on the inside of the nonoptical part of glasses, e.g. bows, frame, or side cover is constituted of the water absorptive porous body having continuous air holes. The water absorptive porous body having the continuous air holes is made of the material obtained through the sinter-molding of the polymer powder which is hydrophilic-treated or the three-dimensional branched network continuous structural body, etc., of polyvinyl formal and preferably has a porosity (%) of 10% or more. When the porous body is installed with water absorption state, the humidity on the peripheral of the eye is increased by the moisture evaporation function from the porous body,) and the discomfortable feeling of a dry-eye patient can be lightened in simple manner.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to eyelids. More specifically, the present invention relates to an eye mask that has the function of alleviating the discomfort of patients with dry eyes (lacrimalia).

[Conventional technology]

Tears play an important role in human daily life.

In addition to preventing dryness of the eyes and washing away foreign substances such as dust that have entered the eyes, it also has a bactericidal effect, and it is well known that when tear production decreases, these functions decrease, making you more susceptible to diseases such as keratitis and conjunctivitis. This is a fact.

It is also said that, as a recent trend, the number of dry eye patients is increasing among computer workers who stare at television screens for long periods of time.

Conventionally, artificial tears have been added to such dry eye patients, but no matter how much the composition of the artificial tears is changed, the effects are poor for patients other than those with mild symptoms. Therefore, there is a method of closing the lacrimal duct from the perspective of how effectively the patient's tears can be used.
Surgical methods and methods of inserting plugs or rods have been devised, but these methods are painful, have side effects such as enlarged lacrimal puncta, do not continue to be effective, and require the intervention of doctors frequently. It comes with some drawbacks. There is also a method of wearing swimming glasses for the purpose of preventing tear evaporation, which is simple and can be expected to be effective to some extent, but is not fully satisfactory.

[Problems to be solved by the present invention]

An object of the present invention is to solve the above-mentioned problems and provide an eyeglass having a function to alleviate the discomfort and symptoms of dry eye patients.

[Means to solve the problem]

In order to solve these problems, the inventors of the present invention have made extensive studies and found that a part or all of the inside of the non-optical parts of the eye can be made of a water-absorbing porous material having continuous pores. The present invention was based on the discovery that wearing the material after it absorbs water has the effect of alleviating the discomfort and symptoms of dry eye patients.

That is, the present invention provides a water-absorbing porous body for non-optical parts for eyeglasses, characterized in that at least part or all of the inside of the part is constituted by a water-absorbing porous body having continuous pores. It has a side effect.

The present invention will be explained in detail below.

First of all, the eyewear referred to in the present invention includes, in addition to normal vision correction layer glasses, safety glasses, side cover glasses, sunglasses, goggles, swimming glasses, canopies, etc. Eyes include me.

In the present invention, the non-optical parts of the eyeglass are its temples, frames, side covers, etc., and at least the inner parts thereof are partially or entirely made of a water-absorbing porous material having continuous pores. .

That is, a part or all of these parts may be composed only of a water-absorbing porous material, or a part or all of the inside of these parts may be composed of a water-absorbing porous material.

Further, a water-absorbing porous material having continuous pores may be attached to the inside of the temple, frame, side cover, etc., using an adhesive, screws, or the like.

The water-absorbing porous material having continuous pores in the present invention is
Continuous pores, such as those sintered from hydrophilized polymer powder, porous composite sheets made by combining reinforcing fibers and hardened binders, and three-dimensional dendritic network continuous structures of polyvinyl formal. It is a porous body with

The porosity (%) of such a porous body is preferably 10% or more, more preferably 30% or more. If the porosity is small, the amount of water absorbed will be small, and if your eyes become wet, you will have to absorb water more frequently.

On the other hand, if the porosity exceeds 95%, problems such as insufficient shape retention and brittleness will occur.

Note that in the present invention, porosity is defined as follows.

Porosity (%) = (ρ.-ρ1)/ρ. ×100ρ,=W
/V However, in the above formula, ρ0 - density of raw material (g/c/) ρ, - apparent density of porous body (g/cnf) W - weight of porous body (g) ■ = of porous body volume (cnr).

Among the water-absorbing porous bodies having continuous pores described above, sintered molded articles of polymers that have been subjected to hydrophilic treatment are preferred from the viewpoint of shape retention and shape imparting properties.

In that case, the polymers include polyethylene, polypropylene, ethylene/butene-1 copolymer, ethylene/4-butene copolymer,
-Methylpentene-1 copolymer, polyolefin such as ethylene/vinyl acetate copolymer, polystyrene, acrylonitrile/styrene copolymer, acrylonitrile/butadiene/styrene copolymer, polycarbonate, polymethyl methacrylate, polyamide, polyester, polyphenylene Oxide, polyacrylonitrile, polyvinyl chloride, polyvinylidene chloride, and their alloys can be used, but among them, it has excellent chemical resistance, does not cause dimensional changes due to water absorption, and does not cause strength loss due to water absorption. Polyolefin resins are preferably used because they can be stably obtained in large quantities at low cost, and have sufficient strength as sintered bodies.

In addition, in order to make these polymers hydrophilic, Japanese Patent Application Laid-open No. 5
A method by sulfonation as exemplified in JP 7-167330, a method of blending a specific surfactant as exemplified in JP-A-63-061981, a method of grafting a hydrophilic monomer onto the surface. Various known methods for making the material hydrophilic include methods such as providing a hydrophilic layer on the surface.

Hydrophilicization of the polymer may be carried out in the powder state before sintering, but it can also be carried out after sintering.

In addition, colorants, fragrances, heat stabilizers,
Additives such as ultraviolet absorbers and antifungal agents can be added.

〔Example〕

Next, the present invention will be specifically explained with reference to examples, but the present invention is not limited to these examples in any way.

Note that the water absorption rate (%) is measured as follows.

First, the dry weight WI (g) of the sintered product is measured.

Next, after soaking the sheet sufficiently for a long time, it is taken out of the water and dripped, and the weight W2 (g) in the wet state is measured and calculated from the following formula.

Absorption rate (%) = (W2-W,)/W2X100 Example 1 Figure 1 shows porosity of 35%, water absorption rate of 35%, and apparent density of 0.
．． 61 g/car of a sintered molded product of hydrophilic polyolefin (trade name: Sunfine AQ-800, manufactured by Asahi Kasei Industries, Ltd.) at 23°C and 50% RH. This is a drying curve.

In addition, when approximately 0.1 J of water was dripped onto the dry sintered molded disc that had been left in an atmosphere of 23°C and 150% RH for approximately 10 hours, the entire volume was molded in approximately 2 seconds. absorbed into the body.

Further, the disk was immersed in water for 1 hour, taken out, and its dimensions were measured while still wet. As a result, almost no change in shape was observed.

Cut out two right-angled triangular plates of 20mm x loffIm from the above sintered molded disk, and apply adhesive (product name: Varnish-Pergel) to the inside of both side covers of safety glasses (manufactured by Sansui Kogaku Co., Ltd., YM-2 type). (manufactured by Henkel Hakusui Co., Ltd.), and in an atmosphere of 23°C and 50% RH, approximately 0.
An eyeglass having a water evaporation function of 0,002 g/min was obtained.

〔Effect of the invention〕

The eye cane of the present invention is useful in that it can increase the humidity around the eyes by evaporating water from the water-absorbing porous material having continuous pores, and can easily alleviate the discomfort of dry eye patients.

[Brief explanation of drawings]

FIG. 1 is a drying curve of Cyfine A Q-800 used as a water-absorbing porous material at 23° C. and 50% RH.

Claims (1)

[Claims] A non-optical component for an eyeglass, wherein at least a part or the entire inside of the component is constituted by a water-absorbing porous material having continuous pores.