JPS5872101A - Synthetic resin lens - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a synthetic resin lens having a relatively high refractive index (refractive index t57 to t61) for a synthetic resin and excellent characteristics.

Since the enactment of the US IDM standards in 1972, the safety of eyeglass lenses has been reconsidered, and safer synthetic resins are being used as lens materials instead of inorganic glass. It has become. The shift from inorganic glass lenses to synthetic resin lenses is a worldwide trend, and in Japan, the share of synthetic resin lenses is increasing year by year.

In particular, the ratio of lenses made of diethylene glycol bisallyl carbonate (hereinafter abbreviated as 0R-5?) resin is expected to have already exceeded 50 in 7 lenses in the United States. Synthetic resin lenses are highly safe, and even if they break, they do not break into minute pieces like inorganic glass, and are less likely to cause damage to the eyes. In addition, it has many advantages compared to inorganic glass, such as being lighter, easier to process, and easier to color. On the other hand, 0R-39, which is a synthetic resin and is widely used as the mainstream eyeglass lens material, has a refractive index of tS.
Due to its low O and weak mechanical strength, the center thickness must be thicker than that of an inorganic glass lens even if the lens has the same dioptric power.

For this reason, the edge thickness of the lens becomes significantly thicker, especially in minus lenses, and there is a strong latent demand from consumers for thinner lenses. Furthermore, organic materials with a relatively high refractive index, such as styrene and recarbonate, have problems in scratch resistance, beading processability, heat resistance, solvent resistance, and the like.

In view of the above points, the present invention has been made in order to realize a synthetic resin lens that has a higher refractive index, fully satisfies various properties required for a lens, and solves manufacturing problems.

That is, the object of the present invention is to provide a lens with a refractive index of approximately 1.6, which is required for eyeglass lenses, to be colorless and have excellent transparency, and to reduce the thickness of the lens, which is a potential requirement of eyeglass wearers. The object of the present invention is to provide a synthetic resin lens with a high processability.

Another major objective of the present invention is to provide excellent weather resistance, heat resistance,
The objective is to synthesize organic lenses with flame retardant properties.

The copolymer for lenses according to the present invention contains 9 to 80 parts by weight of one or more monomers whose general formula is represented by 20 to 80 parts by weight of polymer, 11 to 40 parts by weight of a polymerization initiator whose general formula is represented by (1), and aul to 40 parts by weight of an ultraviolet absorber.
It can be obtained by radical copolymerization of a mixed solution of monomer O containing parts by weight.

......(It) R, -0-0-0-Rs ......(II) (In the formula, X excludes fluorine), rogene or hydrogen, Y excludes fluorine, rogen, R1 is hydrogen or methyl group, R1
゜R1 represents an alkyl group having 1 to 12 carbon atoms, 咒 represents 1 or 2, and RU represents 0 to 3) Substances used in carrying out the present invention (1 (1) [I), ultraviolet absorber The mixing ratio can satisfy the properties required for eyeglass lenses according to the proportions stated in the claims, but in order to have better properties, the monomer [I] used should be Although it varies depending on the type of [I], monomer (1) is 30 to 65 parts by weight, monomer (I[) is 25 to 70 parts by weight, polymerization initiator (N) is 15 to 20 parts by weight, The UV S absorber is (LO5~
17 parts by weight is preferred.

If the composition ratio of monomer CI) is less than 9 parts by weight, the impact strength of the lens will decrease, and if it exceeds 80 parts by weight, the heat resistance, chemical resistance, scratch resistance, and chamferability will be significantly reduced. descend.

When the composition ratio of monomer (II) is less than 20 parts by weight,
Contrary to the case of monomer CI), heat resistance, chemical resistance, abrasion resistance, and abrasive workability decrease, and if it exceeds 80 parts by weight, impact resistance decreases, and the properties required for lenses I can't be satisfied with that.

If the composition ratio of the polymerization initiator (II) is less than 11 parts by weight, the abrasion resistance and solvent resistance will be poor, and if it exceeds 40 parts by weight, it will become difficult to control the reaction.

Examples of the ultraviolet absorbent used in the present invention include benzophenone-based, benzotriazole-based, substituted acrylonitrile-based, and salicylate-based ultraviolet absorbers.

In the present invention, monomer [1] (summer) and [
This is accomplished by injecting a mixture of a polymerization initiator represented by [Summer] and ultraviolet II @ collector O, and heating and curing. The type and concentration of the polymerization initiator are determined by the composition of the mixture of monomers [I] and [Wataru].
It is determined by considering reactivity, reaction rate control, etc.

The synthetic resin lens according to the present invention uses azobisisobutyronitrile, peroxydicarmenate represented by sewable bilber oxydicarbonate, diacyl peroxide represented by benzoyl peroxide, and lauroyl peroxide. , dialkyl peroxide-1 such as di-t-butyl peroxide, and other ketone peroxides and hydroperoxides, which are advantageous in that they provide lenses that are colorless and have excellent transparency, which cannot be achieved with other ketone peroxides or hydroperoxides.

More specifically, polymerization initiators represented by the general formula (1), namely t-butylperoxyisobutyrate, t-butylperoxybiparate, t-butylperoxyneodecanate, 1-butylperoxy By using peroxyester such as laurate, the yellow tint of the lens was removed.

Also, the synthetic resin lens obtained by the above method is 1! io
The adhesion with the coating film formed by vapor deposition such as , etc. was also very excellent, and the quality of the coating film could be improved.

Examples of the present invention are shown below, but they do not limit the scope of the present invention. In the examples, "r parts" means "parts by weight."

Example 1 50 parts by weight of styrene, 4 & 5 parts by weight of 2,2-bis(3□5-dibromo,4-methacroyloxyethoxyphenyl)propane 5 parts by weight of t-butylperoxybiparate t2-(2'-human a) (xy-5'methylphenyl)
Mix and stir 2 parts by weight of benzotriacyl (L). Next, insoluble matter from this mixture is removed with a filter, and the gastric juice is poured into a space made of a gasket made of vinyl chloride and two glass molds. The injection was then carried out at 30°C for 4 hours, then linearly from 50°C to 50°C for 10 hours.
℃ to 70℃ linearly for 2 hours, 70℃ for 1 hour, 8
After thermal cycling at 0° C. for 2 hours, the lens was separated from the gasket and glass mold. Furthermore, the obtained lens was subjected to zesty air treatment at 110° C. for 2 hours to remove distortion inside the lens. The lens thus produced was colorless and had excellent transparency. Also, it has a refractive index of 1 and is colored with a beading process.

The hardness, impact resistance, weather resistance, heat resistance, solvent resistance, and heat resistance were measured and the results are shown in Table 1. Furthermore, 3 μm of silicon dioxide was vacuum-deposited on the obtained lens, and the adhesion of the obtained coating film was investigated, and the results are shown in Table 1.

In addition, the test method for each characteristic was performed as follows.

Refractive index: Measured using an Atsube refractometer Coloration: Colorless and transparent pencils are considered good by visual inspection Workability: Pencils that can be ground with a diamond edger for lens processing and have a clean surface are considered good hardness! 71B ([5400)] A steel ball drop test was performed on a flat plate with a center thickness of 2m1m according to the Schiffm standard, and those that did not break were considered good.Weather resistance: Roughness of the surface after the Weathermeter 2004 test.
Heat resistance: No coloring (yellowing) is considered good. Heat resistance is good when heated at 120°C for 3 hours, and no coloring, change in frequency, or deformation is considered good. Solvent resistance: Ethyl alcohol, A7T at 20°C. Film adhesion: Lenses vacuum-deposited with 3 μm of silicon dioxide were immersed in hot water at 70°C for 2 hours, and those with no elution, surface roughness, clouding, or deformation were considered good. Example-2 0-1 chlorstyrene 60 weight m a 2 #2-bis(S, 5-dibrom-4-methacroyloxie)
Kis7el) Propane! Amount of asffi 10 parts by weight of t-phthyl baroxyneodecanate 5 parts by weight of 2-hydroxy 4-methoxybenzophenone (L) A lens was manufactured in the same manner as in Example 1, and its properties were investigated. Characteristics as a lens It is enough to satisfy
The results are shown in Table-1.

Comparative examples are also shown in Table-1.

The abbreviations of the compositions in Table 1 are as follows: St: Styrene Br4BMII! PP: 2,2-bis(S,
'5-dibromo-4-methacryloyloxyethoxyphenyl)propane 13PV: t-butylperomucibiparate HMIP,
111? 'II T 2-(2'-hydroxy-5'-
methylphenyl)benzotriazole o-ozst: orthochlorostyrene npyn: t,-butylperoxyneodecanate HM
B? ! 2-Hydroxy-4-methoxybenzophenone 11POS Penzoyl peroxide PP1 Diisoprobyl peroxide Table 1 Lens test results

Claims (1)

[Claims] The general formula is [! ] One or more monomers represented by ? to 80 parts by weight, 20 to 80 parts by weight of one or more monomers having the general formula (][), -0 parts by weight of an ultraviolet absorber (from Lot to to parts by weight) A synthetic resin lens characterized by a radical combination of a mixture of mono!-.---(I)R,-0-0-a-1,-CM) halogen or hydrogen excluding fluorine, Y is halogen excluding fluorine, R is hydrogen or methyl group, "me
Ra is an alkyl group having 1 to 12 carbon atoms;