JPS62118301A - Material for spectacle lens - Google Patents

Abstract

PURPOSE:To preserve superior clouding preventing effect for a long time by providing moisture absorbing resin layer on the surface of at least one side of transparent plastic or glass, and providing further a layer of water-wettable resin on the surface of the moisture absorbing resin layer(s). CONSTITUTION:Moisture absorbing resin layer(s) is(are) formed on the surface of at least one side of transparent plastic base material or on a glass base material, and a layer of water-wettable resin is formed on the moisture absorbing resin layer(s). Suitable moisture absorbing resin layer consists of a compsn. consisting primarily of a hydrophilic polymer or oligomer such as ethylene oxide adduct of polyhydric alcohol, polyethylene glycol of polymer or copolymer such as polyvinyl alcohol, hydrophilic acrylic monomer, contg. a crosslinking agent for forming a three dimensional network, reaction catalyst, solvent, etc. Suitable water-wettable resin layer is a layer of resin having easily wettable characteristic by water, but it is not always necessary to have a small angle of contact in advancing movement when a water drop is allowed to contact with the resin; a resin having a very small angle of contact in retreating movement without repelling water when contacting with water drop, but forming water film on its surface, may be also useful.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to lens materials for underwater goggles and other eyeglasses made of transparent glass or plastic.

[Conventional technology]

Underwater goggles used by divers and swimming goggles used when swimming have the disadvantage that the outer surface is cooled by water, and the inner surface becomes hot and humid due to sweating, resulting in condensation forming on the inner surface, resulting in a so-called foggy condition. be.

In order to eliminate this drawback, the following surface treatment methods for eyeglasses or goggles have been proposed and implemented.

■ Applying surfactant etc. to make it water-repellent ■ Saponifying the surface of the cellulose base material to make it hygroscopic (
Tokuko Showa 60-326! ! ! ) ■ A composition containing a hydrophilic resin as a main component is coated and cured to form a hygroscopic resin layer.

(Japanese Patent Publication No. 32-447 Da 27) [Problem to be solved by the invention] However, method (2) has a problem in that the surfactant is easily soluble in water and is washed away by water, especially in underwater goggles. Because it is left unused, sustainability is extremely poor.

In addition, ■ and ■ are beach products that prevent fogging due to their hygroscopic properties, but are not water-resistant, so if they are used in constant contact with water, such as underwater glasses, the hygroscopic resin layer is It is saturated with water, has almost no apparent hygroscopicity, and quickly becomes cloudy. It has also been proposed that a surfactant is added to the hygroscopic resin layer to make it both hygroscopic and water-leak, but similar to ■, the water-leak property is quickly lost. is the current situation.

Based on the above, the inventors of the present invention have conducted extensive research into lens materials that exhibit excellent anti-fog effects even in the special use of underwater glasses. The present invention was completed with the idea of utilizing the invention.

[Means for resolving issues]

That is, the present invention is a lens material for eyeglasses that has both hygroscopicity and water resistance, and is made of a transparent plastic resin layer.

The hygroscopic resin layer as used in the present invention includes polyvinyl alcohol, cellulose derivatives, polymers or copolymers containing hydrophilic acrylic monomers such as diahydroxyalkyl acrylate methacrylate, ethylene oxide adducts of polyhydric alcohols such as sorbitol, borie≠renglifur, etc. It is a composition containing a hydrophilic polymer or oligomer as the main component, a crosslinking agent and a reaction catalyst to create a three-dimensional network structure, and a solvent, etc. This is coated on a base material treated with a primer as necessary and cured. . In addition, a cellulose plastic such as cellulose acetate or cellulose propionate is used as a lens base material, and the surface of the lens is coated with a lens made of cellulose plastic such as cellulose acetate or cellulose propionate. ! ;3 and special C;1 Showa J7-7
The surface layer which has been subjected to tensification treatment by the method shown in 0/cog will also be described as the hygroscopic resin m layer of the present invention. water〃
A repellent resin layer is a resin layer that has the property of easily absorbing water, but it does not necessarily have to have a low advancing contact angle when water droplets are attached, but rather a resin layer that has a very low receding contact angle. It is a resin layer that does not repel water but forms a water film on its surface once exposed to water. Examples of forming such a resin layer include a method in which a composition containing a water-soluble polymer and a small amount of a crosslinking agent is coated on the surface of a hygroscopic resin layer that has been treated with a brimer as necessary, and then cured; Possible methods include activating the surface of the resin layer with a plasma or corona discharge, and graft-polymerizing a water-soluble hexamer such as acrylic acid or acrylamide onto the surface.

[Action/Effect]

The lenses for underwater glasses obtained in this way are used so that the surface having the hygroscopic resin layer and the water-stringing resin layer becomes the inner surface of the glasses, but when it is dry,
& The wet resin layer provides anti-fog properties, and if it gets wet, a water film will form on the surface, and the inner surface of the underwater glasses lens will be sealed with a hygroscopic resin layer. Because they are connected by direct chemical bonds or are a three-dimensional cross-linked coating with good adhesion, they do not dissolve in water and become ineffective like surfactants, and maintain excellent anti-fog effects over a long period of time. It is something to do.

〔Example〕

EXAMPLES Next, the present invention will be explained in detail with reference to Examples, but the present invention is not limited to these Examples.

The evaluation method for antifogging performance is as follows.

Absorbing; 2! ;”In an atmosphere of C, tO%RH,
A diameter J
j; 1wf) Cover the lid with a hole, place the sample on top of the lid with its anti-fog treated side facing down, and close the hole.
The time (seconds) from when the antifogging treated surface became visually visible to the naked eye was measured. To determine the hygroscopicity immediately after immersion in water, the sample was once immersed in distilled water, and immediately after being pulled out, the hygroscopicity was measured as described above.

Water film repellency: A sample was immersed in distilled water, and when the sample was pulled out, the water repellency on the surface was judged as follows.

A: Not repelled at all (good) Bo slowly repelled from the surroundings (slightly poor) C: Repelled at v4 (poor) Example 1 2-hydroxyethyl methacrylate and dimethylaminoethyl were placed on one side of a 3 mm thick glass plate. Copolymer of methacrylate (RIJ:J) 100 shield part, 7-talic anhydride j
Part by weight, epoxy resin (Atsugi Sangyo ERL-1I22/>
! ; Parts by weight, 70-70% of a paint prepared by dissolving 5 parts by weight of 7-7 mi/propyltrimethoxysilane in ethyl cellosolve.
Apply with the coat method and L! A hygroscopic resin layer of about 10 μm was formed by baking at rO″C for 30 minutes, and on top of that was added 100 parts by weight of a copolymer of acrylamide and 2-hydroxyethyl methacrylate <60:110) and 3 parts by weight of glycerol triglycidyl ether. , a small amount of catalyst and flow control agent were formed.The first evaluation result of antifogging performance was
Shown in the table.

Example 2 100 parts by weight of a copolymer of 2-hydroxyethyl methacrylate and glycidyl methacrylate (!0:!;0), 60 parts by weight of triethylene glycol, ammonium perchlorate/ ,! Apply paint dissolved in ethyl cellosolve to the nail area using the dipping method.
Baked at i3o℃ for 1 hour, gJ of about jμ! A wet resin layer was formed.

Next, the surface of this hygroscopic resin layer was subjected to corona discharge treatment using Tesler Fill, and further vapor phase acrylization was performed. The evaluation results of antifogging performance are shown in Table 1.

Comparative Example 1 Table 1 shows the evaluation results of the antifogging performance of Example 1, in which only the hygroscopic resin layer was formed.

Comparative Example 2 A copolymer of 2-hydroxyethyl methacrylate and glycidyl methacrylate C3O:! was applied to the surface of a polycarbonate plate with a thickness of 3 cm. ;0) A coating material prepared by dissolving 100 parts by weight of dimethylaminopropylamine and 8S parts by weight in ethyl cellosolve was applied to form a 720''C flexible resin layer.

The evaluation results of antifogging performance are shown in Table 7.

No.l! ! All samples were immersed in running water for 1 hour and then dried in SO''C for 1 hour before use.

Claims (1)

[Claims] (1) A transparent plastic or glass base material with a hygroscopic resin layer on at least one surface and a water-wettable resin layer on top of the hygroscopic resin layer, which has both hygroscopicity and water-wetting properties. Eyeglass lens material with