US 12,344,711 B2
UV-curable silicone composition for stereolithography, cured product thereof, and method for producing cured product
Nobuaki Matsumoto, Annaka (JP); Taichi Kitagawa, Annaka (JP); and Shinji Kimura, Annaka (JP)
Assigned to SHIN-ETSU CHEMICAL CO., LTD., Tokyo (JP)
Appl. No. 18/285,929
Filed by Shin-Etsu Chemical Co., Ltd., Tokyo (JP)
PCT Filed Mar. 31, 2022, PCT No. PCT/JP2022/016471
§ 371(c)(1), (2) Date Oct. 6, 2023,
PCT Pub. No. WO2022/224793, PCT Pub. Date Oct. 27, 2022.
Claims priority of application No. 2021-073156 (JP), filed on Apr. 23, 2021.
Prior Publication US 2024/0199815 A1, Jun. 20, 2024
Int. Cl. C08G 77/20 (2006.01); B29C 64/129 (2017.01); B33Y 10/00 (2015.01); B33Y 70/00 (2020.01); B33Y 80/00 (2015.01); C08K 5/14 (2006.01)
CPC C08G 77/20 (2013.01) [B29C 64/129 (2017.08); C08K 5/14 (2013.01); B33Y 10/00 (2014.12); B33Y 70/00 (2014.12); B33Y 80/00 (2014.12)] 11 Claims
 
1. An ultraviolet-curable silicone composition for stereolithography, comprising:
(A) 100 parts by weight of a linear diorganopolysiloxane, each end of which is capped with a group of formula (1) below per molecule

OG Complex Work Unit Chemistry
wherein each R1 is independently a substituted or unsubstituted monovalent hydrocarbon group of 1 to 20 carbon atoms, R2 is an oxygen atom or an alkylene group of 1 to 20 carbon atoms, each R3 is independently an acryloyloxyalkyl group, methacryloyloxyalkyl group, acryloyloxyalkyloxy group or methacryloyloxyalkyloxy group, p is a number that satisfies 0≤p≤10, the letter ‘a’ is a number that satisfies 1≤a≤3, and the dashed line represents an available bond;
(B) from 5 to 200 parts by weight of an organopolysiloxane resin comprising (a) units of formula (2) below

OG Complex Work Unit Chemistry
wherein R1, R2, R3, a and p are as defined above,
(b) R43SiO1/2 units, wherein each R4 is independently a substituted or unsubstituted monovalent hydrocarbon group of 1 to 10 carbon atoms, and (c) SiO4/2 units, the molar ratio of the sum of (a) units and (b) units to (c) units being from 0.6:1 to 1.2:1;
(C) from 0.01 to 20 parts by weight of a photopolymerization initiator; and
(D) from 0.1 to 20 parts by weight of an organic peroxide,
wherein R4 of units (b) in component (B) comprises a substituted or unsubstituted alkenyl group of 2 to 6 carbon atoms and further wherein the composition has a viscosity at 23° C. of not more than 10,000 mPa·s and is suitable for use in lithography.