Energy ray-curable resin composition and cured product thereof, and optical lens sheet

Abstract

The invention provides an energy ray-curable resin composition having excellent demoulding character, mold reproducibility, bond strength with the substrate and light resistance; high refractivity; high glass-transition temperature and low viscosity. A energy ray-curable resin composition for optical lens sheets includes: a carbamate compound (A) obtained by reacting the epoxy resin (a), monocarboxylic acid compound (b) having ethylenically unsaturated group and aromatic polyisocyanic acid ester compound (c); a (meth) acrylate (B) having fluorene framework; a single acrylate monomer (C) with phenyl ether group; and a photopolymerization initiator (D), wherein the epoxy resin (a) is a reaction product of epihalohydrins and compound represented by the general formula (1).

Description

technical field The present invention relates to an energy ray curable resin composition, its cured product, and an optical lens sheet. More specifically, it relates to a resin composition and a cured product particularly suitable for lenses such as Fresnel lenses, lenticular lenses, prisms, and microlenses. Background technique At present, the above-mentioned lenses are formed by methods such as pressurization method and casting method (cast molding method). The former, that is, the pressurization method, is manufactured by circulating heating, pressurization, and cooling, so the productivity is poor. The latter, the casting method, has the problem of long production time because the monomer is injected into the mold for polymerization, and also has the problem of increased manufacturing cost because a plurality of molds are required. In order to solve the above-mentioned problems, various proposals have been made regarding the use of an energy ray-curable resin compositi...

AI Technical Summary

Problems solved by technology

However, cured products of these conventional energy ray-curable resin compositions have disadvantages such as poor adhesion to the substrate and poor releasability from the mold.

If the adhesion is poor, the types of substrates that can be used are limited, and it is difficult to obtain the required optical properties

If the releasability is poor, the resin will remain on the mold during demoulding, making the mold unusable

In addition, there is also a problem that the mold releasability of the energy ray-curable resin composition that provides a cured product with good adhesion is also good because the adhesion to the mold is also improved. On the other hand, the mold releasability is good Adhesion of energy ray curable resin composition tends to deteriorate

However, (meth)acrylates having a fluorene skeleton are neither disclosed nor suggested, and scratch resistance is insufficient.

In any case, it is difficult to simultaneously have a high refractive index, a high Tg point, mold release properties, adhesive properties, and low viscosity as an energy ray-curable composition used for an optical lens sheet with a high refractive index and a fine structure. , light resistance and scratch resistance, so a composition that satisfies all properties has not yet been obtained

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