JPS5872901A - Plastic lens - Google Patents

Abstract

PURPOSE:To obtain a lens having about 1.6 refractive index, small chromatic abberation and high workability by cross-linking a specified monomer having a high refractive index and small chromatic abberation with a monomer having >=2 unsatd. double bonds in one molecule such as diallyl phthalate. CONSTITUTION:A mixture of 60pts.wt. monomer represented by structural formula 1 with 40pts.wt. diallyl phthalate monomer having >=2 unsatd. double bonds in one molecule is mixed with 2pts.wt. diisopropyl peroxide as a polymn. initiator, charged into a prescribed glass mold, and heated at 40 deg.C for 2hr. After linearly raising the temp. from 40 deg.C to 90 deg.C, the mixture is hardened by heating for 18hr to obtain a lens.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a synthetic resin lens that has a relatively high refractive index ((refractive index 1.56 to 1.60) for a synthetic resin), has small chromatic aberration, and is easy to process.

Since the enactment of the PI5M standard in the United States in 1972, the safety of @Kagami Shins has been reviewed, and synthetic resins have come to be used in place of inorganic glass.

The shift from inorganic glass lenses to synthetic resin lenses is a global trend, and in Japan, the share of synthetic resin lenses has expanded in the last 4 years. In particular, the ratio WIAFi of lenses made of diethylene glycol bisallyl carbonate (hereinafter abbreviated as CR-39) resin is expected to have already exceeded 50qII in the United States and France. Synthetic resin lenses are not only safe (impact resistance is poor (even if they break, they do not break into minute pieces like inorganic glass, so there is less chance of damaging your eyes), .

Compared to inorganic glass, it has many advantages such as being lighter, easier to process, and easier to view. - 10,000 synthetic resins
CR39, which is used as the mainstream material for mirror shine, is
The refractive index is as low as 1.50 (and the mechanical strength is weak (1), so even lenses with the same i number have to have a center thickness of 1.50 compared to inorganic glass lenses. The edge thickness of the lens (thickness around the lens) becomes significantly 11 (thickness around the lens), and the latent demand from the wearer for thinner lenses becomes very strong.Also, organic materials with high refractive index such as polystyrene, polycarbonate, etc. Fi, abrasion resistance st!f, - There is a certain point in terms of processability, polishability, heat resistance, etc.

Special publication 55-137 for the purpose of improving the above-mentioned disadvantages.
In Publication No. 474, copolymerization of bisphenol methacrylate relatives^tf, 2.2bis(4-methacroyloxynidixyphenyl)propane, etc. with tostyrene, or 0-chlorostyrene, phenyl methacrylate, penzyl methacrylate, etc. Coalescence has been proposed, but these polymers have a high rate of one failure (although another f of lens properties
The characteristic chromatic aberration is large (about the same as I in Abb# number).

- In Japanese Patent Publication No. 51-25746, a thermoplastic resin represented by the general formula (1) is proposed as a lamp.

represents a selected member of the group consisting of, R1 represents an alkyl or hydroxyalkyl group, R1 represents hydrogen, tn represents a methyl group, D represents vinylene, ethylene,
Chloroethylene, hydroxyalkylthio-converted ethylene group, Gij vinylene.

Ethylene or alkyl-substituted ethylene group,
(V represents an integer from 1 to 8, B represents an alkylene group, h represents a thioalkylene group, Rij represents hydrogen, rFi represents an integer from 1 to 8, and X represents an integer from 1 to 2). is high (and chromatic aberration is small (muro b-
Although the optical properties of the lens and the lens are excellent, as mentioned above, since they are thermoplastic, there are problems with polishability, workability, and heat resistance.

The present invention provides a lens with a high refractive index (and small chromatic aberration) which has improved processability, polishability, and heat resistance as disclosed in Japanese Patent Publication No. 51-25746.

A good example of this is the patent publication No. 51-25746.
- Obtained by crosslinking a crosslinkable septamer having two or more unsaturated double bonds in the molecule.

Examples of the crosslinking seven polymers include diallyl phthalate, diallyl isophthalate, and diallyl silosindate. Diethylene glycol bisallyl carbonate, monomers represented by the general formula [old], triallyl shea wing late, etc.

R: Hydrogen, V> is a methyl group;
Copolymerizing with an elevated monomer for good processability and heat resistance is essential to obtaining a lens with good processability, high refractive index, and low dispersion.

In addition, ultraviolet absorbers may be added to improve light resistance.

The following will be explained based on examples.

Example-1 Monomer 5ozts represented by structural formula-1 and bis(4-
Methaqualoxyethoxy-3,5-dibromoferur)propane songs, diisopropylperoxycarbonate 11jLt part, 2-(2'-hydroxy-5
0.1 part by weight of 1-methylphenyl)benzotriazole is mixed. This mixed solution is placed in a mold with two pieces of glass and a gasket, and heated at 30° C. for 4 hours and then from 40° C. to 80° C. for 10 hours while increasing the temperature linearly to obtain a lens.

The refractive index of this lens is 1.592 at F1m°C, which is 1.592 mm bb
The number of m was 40.

70 parts of the 7-mer of structural formula 2, 1 part of bis(4-methacroyloxyethoxyphenyl)propane (equipment), 9 parts
0 yl peroxide 21tiS, 2-(2'-hydroxy-51-methylphenyl)benzotriazole
．． 2 parts by weight were mixed and polymerized with the same IIK as in Example 1. This refraction *ij was 1.564 and the number bb was 50.
)Ta.

Example-3 60 parts by weight of 7mer of structural formula-1 and Shea 1J Luftale
Mix 40 g of diisopropyl peroxycadebonate and 2 parts by weight of diisopropyl peroxycadebonate. Thereafter, the mixed solution was placed in a glass mold and heated linearly from 40°C to 40°C for 18 hours for heat curing.

The refractive index is 1.5f7, mm bbm@42, and fl.

Example 4 A mixed solution of 80 parts of the monomer of structural formula 1, 20 parts by weight of thiethylene glycol Pisal II alkazenate, and 2111 parts of diisopropyl peroxycarbonate was prepared in Example 3.
hardened in the same way.

The refractive index was 1,560, and the BB-number was 51.

The lenses of these examples are polished and diamond-treated.
Processing with foil is possible.

It is also possible to deposit inorganic substances, and their properties are CR-
It shows the same characteristics as No. 39 lens.

As mentioned above, the present invention has a refractive index of II! , (Also, it is possible to obtain a lens with low dispersion and can be polished. Its uses are not only for eyeglass lenses, but also for a wide variety of lenses such as glasses and other lenses. Applicant: Shuwa Seikosha Co., Ltd.) Person Patent Attorney Mogami

Claims (1)

[Claims] +1) A synthetic resin lens whose main components are a mono i- represented by the general formula (1) and a mono →- having two or more unsaturated double bonds in one molecule. 121 Synthetic resin lens using diallyl phthalage or diallyl inphthalate as a heptadmer having two or more unsaturated double bonds in a molecule prepositioned at 121 according to claim wJ1. +31 ago v! The synthetic resin lens according to claim 1, in which a monomer represented by general formula (II) is suspended as the monomer having two or more unsaturated double bonds in one molecule. 14111ilJ&! Claim 1 (in the formula, Muke represents a member selected from the group consisting of: RI: Alkyl L/h is human axyalkyl group R1
: Hydrogen or methyl group D = vinylene, ethylene, chloroethylene, hydroxyalkylthio substituted ethylene or alkylthio key ethylene group z: integer of 1 to 2, y = integer of 1 to 3 B: alkylene vh is thioalkylene group Il: hydrogen or methyl group) −[■] (x: hydrogen or halogen group)