US 12,012,480 B2
Epoxy resin photosensitive composition for optical waveguide, photosensitive film for optical waveguide, optical waveguide, and opto-electric hybrid board
Kazuaki Suzuki, Osaka (JP); and Shinya Ota, Osaka (JP)
Assigned to NITTO DENKO CORPORATION, Osaka (JP)
Appl. No. 17/312,167
Filed by NITTO DENKO CORPORATION, Osaka (JP)
PCT Filed Nov. 27, 2019, PCT No. PCT/JP2019/046428
§ 371(c)(1), (2) Date Jun. 9, 2021,
PCT Pub. No. WO2020/121818, PCT Pub. Date Jun. 18, 2020.
Claims priority of application No. 2018-231451 (JP), filed on Dec. 11, 2018.
Prior Publication US 2022/0017686 A1, Jan. 20, 2022
Int. Cl. C08G 59/38 (2006.01); G02B 6/42 (2006.01)
CPC C08G 59/38 (2013.01) [G02B 6/4212 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An epoxy resin photosensitive composition for an optical waveguide for forming an optical waveguide by being applied to a substrate and patterned by photo-processing comprising:
a hydrogenated alicyclic epoxy resin represented by the following formula (1);
a polyfunctional epoxy resin having 3 or more epoxy groups; and
a photocationic polymerization initiator,
wherein the polyfunctional epoxy resin having 3 or more epoxy groups is a cross-linking component which is cross-linked with the hydrogenated alicyclic epoxy resin, and is blended into the epoxy resin photosensitive composition for an optical waveguide in order to form the optical waveguide as a cured product,
wherein the polyfunctional epoxy resin is at least one selected from the group consisting of an aromatic polyglycidyl ether and an alicyclic polyglycidyl ether,
wherein a content ratio of the polyfunctional epoxy resin is 20 parts by mass or more and 200 parts by mass or less with respect to a solid content of 100 parts by mass of the hydrogenated alicyclic epoxy resin,
wherein formula 1 is:

OG Complex Work Unit Chemistry
wherein:
R1 represents a hydrogen atom or a methyl group;
R2 represents at least one divalent group selected from the group consisting of —CH2—, —C(CH3)H—, —C(CH3)2—, and —SO2—;
A represents an arylene group having two or more branched alkyl groups having 4 or more carbon atoms as a substituent;
B represents a divalent group represented by the following formula (2) or ether bonding;
“n” represents a positive number, and
wherein formula (2) is:

OG Complex Work Unit Chemistry
wherein R3 represents an alkylene group which may have a substituent;
“p” is 1 or 2;
“m” is 0 or 1.