Resin composition for light guide, solidified dry membrane , light guide and forming method thereof

Abstract

The present invention provides a curable resin composition for an optical waveguide, which contains, as essential components, a carboxyl group-containing urethane compound (A), a polymerizable unsaturated compound (B), and two or more compounds capable of ring opening in the molecule. A polymeric functional group compound (C), and a radiation polymerization initiator (D); the present invention also provides a method for forming an optical waveguide, the method is by heating the lower cladding layer (I) and the core part (II) A method of manufacturing an optical waveguide by sticking a dry film composed of a thermosetting resin composition on the surface and then curing it to form the upper cladding layer (III), wherein the Tg of the dry film is higher than that of the cured resin forming the core part (II). Tg is lower by 10° C. or more, and the sticking temperature of the dry film is set to a temperature higher than the Tg of the dry film by 10° C. or more.

Description

technical field [0001] The present invention relates to a curable resin composition for an optical waveguide, a curable dry film for forming an optical waveguide, and an optical waveguide obtained using the same, and further relates to a method for forming an optical waveguide and an optical waveguide obtained by the method. Background technique [0002] In recent years, optical waveguides have attracted attention as optical transmission media due to the need for larger capacity and higher speed of information processing in optical communication systems and computers. As the above-mentioned optical waveguide, a quartz-based waveguide is representative, but it has problems such as requiring a special manufacturing apparatus and taking a long time to manufacture. [0003] Japanese Patent Application Laid-Open No. 2003-202437 proposes to laminate a dry film containing a radiation-polymerizable component on a base material, and then irradiate a certain amount of light to cure th...

AI Technical Summary

Problems solved by technology

[0006] However, when the above-mentioned carboxyl group-containing resin is used as a dry film for optical waveguide formation, when the composition is coated on a release paper such as PET and laminated, and when the laminated dry film is wound film, or pasting the dry film on the substrate to form an optical waveguide, etc., the dry film may have defects such as cracks or cracks, which will reduce the performance of the optical waveguide

In addition, in the technology described in the above-mentioned publication, when the upper cladding layer is formed on the surface of the core part and the lower cladding layer using a dry film, there is a possibility that there will be a gap between the depression in the convex part of the core part and the upper cladding layer. voids, the designed core shape cannot be obtained, and thus sufficient transmission characteristics cannot be obtained

[0007] In the resin composition for an optical waveguide described in JP-A-2003-149475, there is no description of using the composition as a dry film for forming an optical waveguide. KOKAI Publication No. 2003-202437 similarly applies the composition to release paper such as PET for lamination, and when winding the laminated dry film, or sticking the dry film on the substrate During processing operations such as forming an optical waveguide, the dry film may have defects such as cracks or cracks, which may degrade the performance of the optical waveguide

In addition, when the resin composition for an optical waveguide described in JP-A-2003-149475 is prepared and used as a solution, the finally obtained optical waveguide has insufficient mechanical properties such as processability and bendability. When the waveguide is installed in the required place or during processing, there may be defects such as breakage or cracking, which will degrade the performance of the optical waveguide

Furthermore, when the dry film is used to form the upper cladding layer on the surfaces of the core portion and the lower cladding layer in the same manner as in JP-A-2003-202437 , the gap between the dimples in the convex portion of the core portion and the upper cladding layer Voids may be generated, the designed core shape cannot be obtained, and thus sufficient transmission characteristics cannot be obtained

Images