JPS6356601A - Rimmed plastic lens - Google Patents

Abstract

PURPOSE:To eliminate the uneven film thickness by the jig traces formed at the time of forming a hard coat film by providing a rim of a specific width to the outside peripheral part of a plastic lens. CONSTITUTION:The rim part 4 having 0.1-5.0mm width is provided to part or the whole of the outer peripheral part of a body 3 of the plastic convex lens 2 consisting of an urethane-modified di(meth)acrylate (co)polymer of a halogenated bisphenol A and the hard coat film is formed on the lens surface. Said coat film is obtd. by gripping the lens 2 by means of; for example, 3-point supporting jigs 1 and subjecting the lens to dip coating and is preferably the film contg. >=10wt% org. silicon compd. expressed by formula and/or cured matter of the hydrolyzate thereof. In formula, R denotes an org. group of 4-20C which has an epoxy group or glycidoxy group and binds to Si at Si-C; (x) denotes a hydrolyzable group; (a) denotes 0, 1.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to optical plastic molded articles such as eyeglass lenses and camera lenses that do not chip during transportation or handling, and coating molding thereof. The present invention relates to a good optical plastic lens that has no unevenness in film thickness caused by a jig during film formation, has a good appearance, and has no uneven dyeing on the lens surface used even after dyeing.

(Prior Art) Plastic lenses have extremely excellent impact resistance and transparency, are lightweight, and are easily dyed, so they are applied to various optical parts fields, including eyeglass lenses as well as eyeglass lenses.
Applications are expanding to camera lenses, projector lenses, Fresnel lenses, automobile headlight lenses, etc. However, on the other hand, plastic lenses generally have a lower surface hardness than inorganic glass lenses and have the problem of being easily scratched. For this reason, in general, for plastic lenses, it is essential to form a hard coat film that increases the surface hardness of the lens surface and imparts high scratch resistance.

As a means of forming this hard coat film, a hard coat composition such as melamine resin, epoxy resin, acrylic resin, or organosilicon resin is applied to the lens surface in the form of a solution, and then cured by heating or ultraviolet irradiation. method is commonly adopted. The hard coat composition can be applied using spinner coating, which can be applied to a uniform film thickness, or
Dip coating is used, but both coating methods require a jig to support the lens, and the hard coat composition accumulates in the contact area between the lens and the jig, resulting in uneven film thickness and poor appearance. Not only is this bad, but the dyed product also has the problem of uneven dyeing due to non-uniform film thickness, which reduces the effective diameter of the lens. To solve this problem, there are methods to reduce the surface tension of the hard coat solution by adding silicone-based or fluorine-based surfactants to the hard coat composition, and to create small holes around the lens periphery as a coating jig. In order to reduce the contact area between the jig and the lens,
A coating method using a needle-like jig with a sharp tip is used.

(Problems to be Solved by the Invention) Although the above-mentioned conventional technique of adding a surfactant to the paint is effective to some extent, it is difficult to completely eliminate jig marks, and it is difficult to completely eliminate jig marks. The method of gluing and coating not only requires time for handling, but also
There is a problem in that it is difficult to apply to plastic lenses with a thin peripheral edge. The coating method using a needle-shaped jig is effective for negative lenses with thick peripheral edges, but has a problem that it cannot be applied to positive lenses with thin peripheral edges.

[Means to solve the problem]

The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, have arrived at the present invention described below. That is, the present invention relates to a plastic lens with a flange, which is characterized in that the plastic lens has a flange with a width of 0.1 mm to 5.0 mm on a part or all of its outer periphery, and a hard coat film is provided thereon.

The shape of the flanged plastic lens of the present invention will be specifically explained with reference to FIG. FIG. 1 is an explanatory diagram of a cast-molded plastic lens with a flange provided on the periphery, and a flange 4 is provided on the periphery of the plastic lens portion 3. FIG. Although there are no particular limitations on the shape of the collar in the present invention, it is necessary that the collar not be deformed by gripping the coating jig. The width of the brim in the horizontal direction is required to be 0.1 mm to 5.0+t+m, and preferably 0.3 m1 to 3.0 mm. o
, 11TlllTl, the effect of adding a brim will not be recognized, and if it exceeds 5°Omn+, the loss of lens raw material will be large and it is not practical. The thickness of the brim is not particularly limited, but is between 0.5nvn and 5.0nm. Omm is preferred.

Plastic substrates in the present invention include, but are not limited to, poly(diethylene glycol bisallyl carbonate), polymethyl methacrylate, polycarbonate, polyester, unsaturated polyester, acrylonitrile (halogenated) styrene copolymer, vinyl chloride, Polyurethane, epoxy resin, (halogenated)
Di(meth)acrylate polymers of bisphenol A and copolymers thereof, urethane-modified di(meth)acrylate polymers of (halogenated) bisphenol A and copolymers thereof, and the like are preferably applied.

In the present invention, the hard coat film is not particularly limited as long as it can improve scratches and scratches on the surface of plastic, but from the viewpoint of imparting dyeability, which is a characteristic of plastic, the following general formula (1) is used. It is preferable that the coating contains 10% by weight or more of a cured product consisting of an organosilicon compound represented by the formula and/or its hydrolyzate.

(In the formula, R has an epoxy group or a glycidoxy group,
a carbon-containing group having 4 to 20 carbon atoms bonded to silicon through 5i-C,
X is a hydrolyzable group, and a is O or 1. > Specific examples of the organosilicon compound represented by the general formula (1) include glycidoxymethyltrimethoxysilane, glycidoxymethyltriethoxysilane, α-glycidoxyethyltrimethoxysilane, α-glycidoxy Ethyltriethoxysilane, β-glycidoxyethyltrimethoxysilane, β-glycidoxyethyltriethoxysilane, α-glycidoxypropyltrimethoxysilane, α-glycidoxypropyltriethoxysilane, β-
Glycidoxypropyltrimethoxysilane, β-glycidoxypropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, γ-glycidoxypropyltriproboxysilane, γ -Glycidoxypropyltributoxysilane, γ-glycidoxypropyltrimethoxyethoxysilane, γ-glycidoxypropyltriphenoxysilane, γ-glycidoxypropyltriacetoxysilane, α-glycidoxybutyltrimethoxysilane ,α
-Glycidoxybutyltriethoxysilane, β-glycidoxybutyltrimethoxysilane, β-glycidoxybutyltriethoxysilane, γ-glycidoxybutyltrimethoxysilane, γ-glycidoxybutyltriethoxysilane, δ - glycidoxybutyltrimethoxysilane,
δ-glycidoxybutyltriethoxysilane, (3,4
-Epoxycyclohexyl)methyltrimethoxysilane, (3,4-epoxycyclohexyl)methyltriethoxysilane, β-(3,4-epoxycyclohexyl)
Ethyltrimethoxysilane, β-(3,4-epoxycyclohexyl)ethyltriethoxysilane, β-(3,
4-Epoxycyclohexyl)ethyltripropoxysilane, β-(3,4-epoxycyclohexyl)ethyltributoxysilane, β-(3,4-epoxycyclohexyl)ethyltrimethoxyethoxysilane, β-(3
,4-epoxycyclohexyl)ethyltriphenoxysilane, γ-(3,4-epoxycyclohexyl)propyltrimethoxysilane, γ-(3,4-epoxycyclohexyl>propyltriethoxysilane, β-(3,
Trialkoxysilanes such as 4-epoxycyclohexyl)butyltrimethoxysilane, β-(3,4-epoxycyclohexyl)butyltriethoxysilane, triazyloxysilane or triphenoxysilanes or their hydrolysates, and glycidoxymethyl Methyldimethoxysilane, glycidoxymethylmethyljethoxysilane, α-glycidoxyethylmethyldimethoxysilane,
α-glycidoxyethylmethyljethoxysilane, β-
Glycidoxyethylmethyldimethoxysilane, β-glycidoxyethylmethyljethoxysilane, α-glycidoxypropylmethyldimethoxysilane, α-glycidoxypropylmethyljethoxysilane, β-glycidoxypropylmethyldimethoxysilane, β-glycidoxypropylmethyljethoxysilane, γ-glycidoxypropylmethyldimethoxysilane, γ-glycidoxypropylmethyljethoxysilane, γ-glycidoxypropylmethyldipropoxysilane, γ-glycidoxypropylmethyl Dibutoxysilane, γ-glycidoxypropylmethyldimethoxyethoxysilane, γ-glycidoxypropylmethyldiphenoxysilane, γ-glycidoxypropylethyldimethoxysilane, γ-glycidoxypropylethyljethoxysilane, γ-glycidoxypropylmethyldimethoxysilane Sidoxypropylethyldipropoxysilane, γ-glycidoxypropylvinyldimethoxysilane, γ-glycidoxypropylvinyljethoxysilane, γ-glycidoxypropylphenyldimethoxysilane, γ-glycidoxypropylphenyldiethoxysilane, etc. Examples include dialkoxysilane, diphenoxysilane, diacyloxysilanes, and hydrolysates thereof.

Further, during curing, it is also possible to add and use a curing catalyst for the purpose of low temperature curing, shortening of curing time, etc.

Specific examples include alkali metal salts of organic carboxylic acids, aluminum chelate compounds, such as acetylacetone aluminum salt, and the like.

The plastic lens of the present invention is effective for lenses with thin edges, especially lenses with extremely thin edges such as convex lenses, in terms of increasing the effective diameter and preventing edge chipping.

〔Example〕

EXAMPLES In order to clarify the gist of the present invention, Examples are given below, but the present invention is not limited to these Examples.

Example 1 1) Lens molding Tetrabromobisphenol A ethylene oxide 2
To the molar adduct, 0.9 mol of hexamethylene diisocyanate is added to 1 mol of a hydroxyl group-containing compound in which 1 mol of acrylic acid is bonded by esterification to produce 70 parts of heptamer containing a polyfunctional acrylate monomer and 30 parts of styrene.
The part was cast polymerized using inpropyl peroxide as a polymerization initiator, and a width of 0 was applied to the peripheral part of the lens (spherical power: +4.00 diopter, aspherical power: 0.00 diopter).
．． A plastic lens with a brim having a brim of 5 mm and a thickness of 1.0 mm was molded.

2) Hard coat of lens The lens obtained in 1) is held with a coating jig with three points support as shown in Fig. 2, immersed in a hard coat liquid tank filled with hard coat agent, pulled out, and prepared as a reserve. After drying,
The coating jig was removed and only the lens was heated and cured to obtain a hard coated lens. As a result of inspecting the 1q hard coated lens, it was found to be in good condition with no jig marks.

Furthermore, this lens was immersed in a disperse dye dyeing bath for dyeing.

When the obtained dyed lens was inspected, it was found that the entire effective diameter of the lens was uniformly dyed and was in good condition.

Comparative Example 1 1) Molding of Lens A plastic lens was molded in the same manner as in Example 1 except that there was no brim around the lens periphery.

2) Hard coat of lens A hard coat was performed in the same manner as in Example 1 to obtain a hard coated lens.

As a result of inspecting the obtained hard coat lens, it was found that the hard coat agent had accumulated in the contact area between the lens and the jig, and there was a portion with an uneven thickness of 4 nm+ from the lens periphery. Furthermore, when dyeing was carried out in the same manner as in Example 1, the dyeing density was different between areas with uneven film thickness and normal areas, and in order to obtain a lens with a good appearance, it was necessary to remove 51TllTI from the periphery, and the effective diameter was small. It became a thing.

(Effects of the Invention) The flanged plastic lens obtained by the present invention has the following effects.

(1) A lens with a good appearance without coating jig marks can be obtained.

(2) Eliminates edge chipping due to transportation and handling;
Product yield is improved.

(3) The effective diameter of the lens becomes larger.

[Brief explanation of the drawing]

Figure 1 is a lens with a flange, which has a flange on the periphery of a plastic lens, Figure 2 is an illustration of a coating jig with three points of support for dip coating, and Figure 3 is an illustration of a conventional lens without a flange. It is. 1: 3-point support coating jig 2: Lens 3: Lens body 4 Nipper section Patent applicant Toshi Co., Ltd. Figure 7 Figure 2 Figure 3

Claims (3)

[Claims] (1) Part or all of the outer periphery has a width of 0.1 mm to 5 mm.
．． A plastic lens with a brim, characterized in that the plastic lens has a brim of 0 mm and is coated with a hard coat film. (2) The flanged plastic lens according to claim (1), wherein the plastic lens is a convex lens. (3) A patent claim characterized in that the hard coat film contains 10% by weight or more of a cured product obtained from an organosilicon compound represented by the following general formula (I) and/or its hydrolyzate. A plastic lens with a flange as described in scope item (1). ▲There are mathematical formulas, chemical formulas, tables, etc.▼(I) (In the formula, R has an epoxy group or a glycidoxy group,
an organic group having 4 to 20 carbon atoms bonded to silicon through Si-C,
X is a hydrolyzable group, and a is 0 or 1. )