# US 2019/0169358 A1 · Epoxy resin composition and transformer comprising the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0169358 A1 - Document ID: US20190169358A1 - Status: Published application - Kind: A1 - Application number: 15/997,224 - Filed: 2018-06-04 - Published: 2019-06-06 - Earliest claimed: 2017-12-01 - Assignees: Lsis Co., Ltd. - Applicants: Lsis Co., Ltd. - Inventors: Sang-Eon KIM; Wook-Dong CHO; Heon-Seop SONG; Tae-Yun KANG; Han-Gil KIM; Hyeon-Jeong CHOI - Web page: https://patentgrep.com/patent/US20190169358A1 ## CPC - C08G 59/686: {containing nitrogen} - C08G 59/22: Di-epoxy compounds - C08G 59/4215: {cycloaliphatic} - C08G 59/4238: {heterocyclic} - C08K 3/00: Use of inorganic substances as compounding ingredients - C08K 3/013: Fillers, pigments or reinforcing additives - C08K 5/0025: {Crosslinking or vulcanising agents; including accelerators} - C08K 5/3445: Five-membered rings - C09K 5/14: Solid materials, e.g. powdery or granular - H01F 27/327: {Encapsulating or impregnating (encapsulating coil and core H01F27/022)} - H01F 27/34: Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields - C08K 3/36: Silica - C08K 2201/001: Conductive additives - H01F 2027/329: {Insulation with semiconducting layer, e.g. to reduce corona effect} - C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ## Abstract The disclosure describes an epoxy resin composition and a transformer including the same. The epoxy resin composition according to an embodiment of the present invention includes an epoxy resin having a glycol-based functional group in a main chain, a filler, a curing agent, and an imidazole-based catalyst, and the transformer according to an embodiment includes an insulated conductor wound in multiple layers in a vertical direction; a semi-conductive layer which is provided on the insulated conductor and disperses a concentrated electric field; and an insulator which is casted on the insulated conductor and the semi-conductive layer and forms an outer shape of the transformer, and the insulator consists of the epoxy resin composition including the epoxy resin having the glycol-based functional group in the main chain, the filler, the curing agent, and the imidazole-based catalyst. ## Claims ### Claim 1 An epoxy resin composition comprising: an epoxy resin having a glycol-based functional group in a main chain; a filler for an electrical insulation and a thermal conduction; a curing agent for curing the epoxy resin; and an imidazole-based catalyst. ### Claim 2 (depends on 1) The epoxy resin composition of claim 1, wherein it comprises 15-25% by weight of the epoxy resin, 30-70% by weight of the filler, 10-20% by weight of the curing agent, and 0.001-0.1% by weight of the imidazole-based catalyst, based on a total weight of the epoxy resin composition. ### Claim 3 (depends on 1) The epoxy resin composition of claim 1, wherein the epoxy resin has a molecular weight per equivalent of 300 to 400. ### Claim 4 (depends on 1) The epoxy resin composition of claim 1, wherein the glycol-based functional group is selected from the group consisting of ethyl glycol, methyl glycol, butyl glycol, and propyl glycol. ### Claim 5 (depends on 1) The epoxy resin composition of claim 1, wherein the imidazole-based catalyst is selected from the group consisting of 1-imidazole, 1-vinylimidazole, 1-ethylimidazole, 2-methylimidazole, 1-benzyl-2-phenylimidazole, 2-ethyl-4-methylimidazole and 1-cyanoethyl-2-ethyl-4-methylimidazole. ### Claim 6 A transformer comprising: an insulated conductor wound in multiple layers in a vertical direction; a semi-conductive layer which is provided on the insulated conductor and disperses a concentrated electric field; and an insulator which is casted on the insulated conductor and the semi-conductive layer and forms an outer shape of the transformer, wherein the insulator consists of an epoxy resin composition comprising an epoxy resin having a glycol-based functional group in a main chain, a filler, a curing agent, and an imidazole-based catalyst. ### Claim 7 (depends on 6) The transformer of claim 6, wherein it comprises 15-25% by weight of the epoxy resin, 30-70% by weight of the filler, 10-20% by weight of the curing agent, and 0.001-0.1% by weight of the imidazole-based catalyst based on a total weight of the epoxy resin composition. ### Claim 8 (depends on 6) The transformer of claim 6, wherein the epoxy resin has a molecular weight per equivalent of from 300 to 400. ### Claim 9 (depends on 6) The transformer of claim 6, wherein the glycol-based functional group is selected from the group consisting of ethyl glycol, methyl glycol, butyl glycol, and propyl glycol. ### Claim 10 (depends on 6) The transformer of claim 6, wherein the imidazole-based catalyst is selected from the group consisting of 1-imidazole, 1-vinylimidazole, 1-ethylimidazole, 2-methylimidazole, 1-benzyl-2-phenylimidazole, 2-ethyl-4-methylimidazole and 1-cyanoethyl-2-ethyl-4-methylimidazole.