Curable composition containing a reactive (meth)acrylate polymer and a cured product thereof

Abstract

Provided is a curable composition which has superior surface hardness, excellent flexibility and bending properties, and makes it possible to form a heat-resistant cured film having both strength and flexibility, and a cured product (film) thereof. The curable composition includes a reactive (meth)acrylate polymer (A) having the monomer unit indicated by general formula (1), a polymerization initiator (B), and a reactive monomer (C). In formula (1), R1 represents a hydrogen atom, a methyl group, or an ethyl group; R2 represents a hydrogen atom or a methyl group; X1 represents a straight chain or branched hydrocarbon group of 2 - 6 carbon atoms, or polyethylene glycol, polypropylene glycol, or an alcohol residue of a caprolactone-modified terminal diol on both ends; and n represents an integer from 2 to 4, and m represents an integer from 1 to 5.

Description

technical field The present invention relates to a curable composition cured by irradiation or heating of active energy rays such as ultraviolet rays and electron beams, and a cured product thereof. More specifically, the present invention relates to a curable composition capable of forming a cured product excellent in hardness, scratch resistance, heat resistance and flexibility, and a cured product thereof. Background technique In recent years, it has been used in protective coating materials used to prevent scratches and contamination on the surface of various substrates, adhesives for various substrates, ceiling materials, film-type liquid crystal elements, touch panels, and anti-reflection of plastic optical components. For film applications, a curable composition capable of forming a cured film excellent in hardness, flexibility, scratch resistance, abrasion resistance, low curling property, high refractive index, adhesion and transparency is required. Among these req...

AI Technical Summary

Problems solved by technology

However, when inorganic fillers are added to the resin, its transparency is significantly damaged, the surface smoothness is lost, and the dispersibility is poor, so there is unevenness in the substrate, and there are problems such as easy cracking.

In addition, when an inorganic film is laminated, there are problems such as peeling and cracking due to poor adhesion to resin and large difference in shrinkage.

JP-A-10-298252 (Patent Document 4) describes that colloidal silica is uniformly dispersed in a radically polymerizable vinyl compound such as methyl methacrylate using a silane compound, which is excellent in transparency and rigidity. Curable compositions, but these compositions are mainly designed for hard coating, lack of flexibility, do not have both hardness and flexibility

Moreover, heat resistance is not sufficient

JP-A-09-157315 (Patent Document 5) describes a urethane acrylic monomer containing a (meth)acryloyloxy group in one molecule, having a hydroxyl group, a cyclic ether bond, and a chain ether bond. An ultraviolet curable resin raw material composition of an acrylic monomer and colloidal silica, but in the composition, the colloidal silica is in the state of being dispersed in the urethane (meth)acrylate, and the glue There is no chemical bond between state silica and urethane (meth)acrylate, so the required high elasticity and high heat resistance cannot be obtained

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