Composition and film

Patent metadata

Field	Value
Publication number	US-10723909-B2
Application number	US-201615003620-A
Country	US
Kind code	B2
Filing date	Jan 21, 2016
Priority date	Jan 21, 2015
Publication date	Jul 28, 2020
Grant date	Jul 28, 2020

Abstract

Methods for producing an optical element having a cured layer with a concavo-convex structure are described. Such a method includes: forming a composition layer on a base material by using a composition containing a polymerizable compound and a photo initiator; forming a pattern formative layer by pressure-contacting a mold; and forming the cured layer having the concavo-convex structure by photo-curing the pattern formative layer, wherein the polymerizable compound contains (a) a urethane (meth)acrylate monomer, the composition contains 0.005 to 0.5 part by mass of the photo initiator with respect to 100 parts by mass of the polymerizable compound, and the cured layer has a film thickness of the concavo-convex structure within a range of 0.5 mm to 1 cm.

First claim

What is claimed is:

1. A method for producing an optical element having a cured layer having a concavo-convex structure, the method comprising:
forming a composition layer on a base material by utilizing a composition containing a polymerizable compound and a photo initiator;
forming a pattern formative layer by pressure-contacting a mold having the concavo-convex structure on a surface of the composition layer and then transferring the concavo-convex structure to the composition layer; and
forming the cured layer having the concavo-convex structure by photo-curing the pattern formative layer,
wherein the polymerizable compound contains both:
(a) a urethane (meth)acrylate monomer having a molecular weight of 400 or more; and
(b) a (meth)acrylate monomer having at least one of an alicyclic structure or a heteroalicyclic structure, the (meth)acrylate monomer (b) being other than the urethane (meth)acrylate monomer (a),

wherein the polymerizable compound has a composition ratio, by mass, of (a) to (b),
wherein the mass of the urethane (meth)acrylate monomer (a) is from less than 100 parts by mass to 36 parts by mass based on 100 parts by mass of the polymerizable compound, and
wherein the mass of the (meth)acrylate monomer (b) is from greater than 0 parts by mass to 60 parts by mass based on 100 parts by mass of the polymerizable compound, respectively,

wherein the composition contains 0.005 to 0.5 part by mass of the photo initiator based on 100 parts by mass of the polymerizable compound, and
wherein a film thickness of the cured layer having the concavo-convex structure is within the range of 0.5 mm to 1 cm.

2. The method according to claim 1 , wherein at least one of (a) the urethane (meth)acrylate monomer and (b) the (meth)acrylate monomer contains a monomer having a methacryloyl group.

3. The method according to claim 1 , wherein the polymerizable compound contains a monomer having a polymerizable group, except for a (meth)acryloyl group.

4. The method according to claim 1 , wherein the polymerizable compound further contains a monomer (c) having a ring structure.

5. The method according to claim 4 , wherein at least one of monomers (b) and (c) contains a monomer with a molecular weight greater than or equal to 400.

6. The method according to claim 1 , wherein the urethane (meth)acrylate monomer (a) has a ring structure.

7. A method for producing an optical element having a cured layer having a concavo-convex structure, the method comprising:
utilizing a composition comprising:
100 parts by mass of a polymerizable compound comprising both:
(a) a urethane (meth)acrylate monomer having a molecular weight of 400 or more, and
(b) a (meth)acrylate monomer having at least one of an alicyclic structure or a heteroalicyclic structure, the (meth)acrylate monomer having a ring structure being other than the urethane (meth)acrylate monomer,

a composition ratio, by mass, of (a) to (b),
wherein the mass of the urethane (meth)acrylate monomer (a) is from less than 100 parts by mass to 36 parts by mass based on the 100 parts by mass of polymerizable compound, and
wherein the mass of the (meth)acrylate monomer (b) is from greater than 0 parts by mass to 60 parts by mass based on the 100 parts by mass of polymerizable compound, respectively, and
from 0.005 to 0.5 parts by mass of a photo initiator to form a composition layer on a base material;

pressure-contacting a mold having the concavo-convex structure on a surface of the composition layer and then transferring the concavo-convex structure to the composition layer to form a pattern formative layer; and
photo-curing the pattern formative layer to form the cured layer having a film thickness of from 0.5 mm to one (1) cm.

8. The method according to claim 7 , wherein at least one of the urethane (meth)acrylate monomer and the (meth)acrylate monomer contains a monomer having a methacryloyl group.

9. The method according to claim 7 , wherein the (meth)acrylate monomer contains a monomer with a molecular weight greater than or equal to 400.

Assignees

• Toyo Gosei Co Ltd

Inventors

• Wada Risa
• Osaki Takeshi

Classifications

• C09D133/08 Primary

  Homopolymers or copolymers of acrylic acid esters · CPC title

• C09D4/00 Primary

  Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond {; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16} · CPC title

• G11B7/263

  Preparing and using a stamper, e.g. pressing or injection molding substrates (production of optical record carriers, e.g. optical discs B29D17/005) · CPC title

• C08F222/1065

  of alcohol terminated (poly)urethanes, e.g. urethane(meth)acrylates · CPC title

• G11B7/253

  of substrates · CPC title