# US 2021/0332175 A1 · Ultraviolet curable silicone composition and cured product thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0332175 A1 - Document ID: US20210332175A1 - Status: Published application - Kind: A1 - Application number: 17/273,450 - Filed: 2019-09-13 - Published: 2021-10-28 - Earliest claimed: 2018-09-20 - Assignees: Shin-Etsu Chemical Co., Ltd. - Applicants: Shin-Etsu Chemical Co., Ltd. - Inventors: Nobuaki MATSUMOTO; Kohei OTAKE; Taichi KITAGAWA; Tsuyoshi MATSUDA; Toshiyuki OZAI - Web page: https://patentgrep.com/patent/US20210332175A1 ## CPC - C08F 283/124: {on to polysiloxanes having carbon-to-carbon double bonds} - C08F 290/068: {Polysiloxanes} - C08L 83/04: Polysiloxanes - B33Y 70/00: Materials specially adapted for additive manufacturing - C08G 77/20: containing silicon bound to unsaturated aliphatic groups - C08G 77/38: Polysiloxanes modified by chemical after-treatment - C08G 77/50: by carbon linkages - C08G 77/52: containing aromatic rings - C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - B33Y: ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING - C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS ## Abstract Provided are a low-viscosity ultraviolet curable silicone composition capable of being used even in a surface exposure method and a lift-up method etc.; and a cured product superior in tensile strength and elongation at break. The ultraviolet curable silicone composition contains: (A) an organopolysiloxane; (B) a photopolymerization initiator; and (C) a monofunctional (meth)acrylate compound having no siloxane structure and/or (D) a multifunctional (meth)acrylate compound having no siloxane structure, wherein the organopolysiloxane is represented by the following general formula (1): wherein n satisfies 1≤n≤1,000, m satisfies 1≤m≤1,000, Ar is an aromatic group, R1 represents a monovalent hydrocarbon group having 1 to 20 carbon atoms, A is a group represented by the following formula (2): wherein p satisfies 0≤p≤10, a satisfies 1≤a≤3, R1 represents a monovalent hydrocarbon group having 1 to 20 carbon atoms, R2 represents an oxygen atom or an alkylene group, R3 represents an acryloyloxyalkyl group or the like. ## Claims ### Claim 1 An ultraviolet curable silicone composition comprising: (A) 100 parts by mass of an organopolysiloxane; (B) 0.1 to 10 parts by mass of a photopolymerization initiator; and 1 to 400 parts by mass of at least one of (C) a monofunctional (meth)acrylate compound having no siloxane structure and (D) a multifunctional (meth)acrylate compound having no siloxane structure, wherein the organopolysiloxane is represented by the following general formula (1): wherein n is a number satisfying 1≤n≤1,000, m is a number satisfying 1≤m≤1,000, siloxane units identified by n and m are sequenced in any order, Ar is an aromatic group, each R1 independently represents a monovalent hydrocarbon group having 1 to 20 carbon atoms, A is a group represented by the following formula (2): wherein p is a number satisfying 0≤p≤10, a is a number satisfying 1≤a≤3, each R1 independently represents a monovalent hydrocarbon group having 1 to 20 carbon atoms, R2 represents an oxygen atom or an alkylene group, R3 represents an acryloyloxyalkyl group, a methacryloyloxyalkyl group, an acryloyloxyalkyloxy group or a methacryloyloxyalkyloxy group. ### Claim 2 (depends on 1) The ultraviolet curable silicone composition according to claim 1, wherein R1 in the general formula (1) represents an alkyl group having 1 to 10 carbon atoms. ### Claim 3 (depends on 1) The ultraviolet curable silicone composition according to claim 1, wherein the ultraviolet curable silicone composition has a viscosity of not higher than 10,000 mPa·s at 25° C. ### Claim 4 (depends on 1) A cured product of the ultraviolet curable silicone composition according to claim 1. ### Claim 5 (canceled) ### Claim 6 (depends on 2) The ultraviolet curable silicone composition according to claim 2, wherein the ultraviolet curable silicone composition has a viscosity of not higher than 10,000 mPa·s at 25° C. ### Claim 7 (depends on 2) A cured product of the ultraviolet curable silicone composition according to claim 2. ### Claim 8 (depends on 3) A cured product of the ultraviolet curable silicone composition according to claim 3. ### Claim 9 (depends on 6) A cured product of the ultraviolet curable silicone composition according to claim 6.