US 12,122,860 B2
Photocurable support material composition for inkjet 3D printers, ink for inkjet 3D printers, cartridge for inkjet 3D printers, method for producing support material and method for producing optically shaped article
Yasunori Tsujino, Suita (JP); Minoru Urata, Suita (JP); and Noriaki Majima, Suita (JP)
Assigned to NIPPON SHOKUBAI CO., LTD., Osaka (JP)
Appl. No. 16/328,950
Filed by NIPPON SHOKUBAI CO., LTD., Osaka (JP)
PCT Filed Aug. 30, 2017, PCT No. PCT/JP2017/031210
§ 371(c)(1), (2) Date Feb. 27, 2019,
PCT Pub. No. WO2018/043582, PCT Pub. Date Mar. 8, 2018.
Claims priority of application No. 2016-170655 (JP), filed on Sep. 1, 2016; and application No. 2017-052167 (JP), filed on Mar. 17, 2017.
Prior Publication US 2019/0241684 A1, Aug. 8, 2019
Int. Cl. B29C 64/00 (2017.01); B29C 64/40 (2017.01); B33Y 10/00 (2015.01); B33Y 70/00 (2020.01); C08F 20/06 (2006.01); B29K 105/00 (2006.01); B33Y 70/10 (2020.01)
CPC C08F 20/06 (2013.01) [B29C 64/40 (2017.08); B33Y 10/00 (2014.12); B33Y 70/00 (2014.12); B29K 2105/0002 (2013.01); B33Y 70/10 (2020.01)] 9 Claims
 
1. A photocurable support material composition for an inkjet 3D printer comprising:
a mixture of water-soluble ethylenically unsaturated monomers;
a photopolymerization initiator; and
a solvent, and
wherein said mixture of water-soluble ethylenically unsaturated monomers comprises:
a first water-soluble ethylenically unsaturated monomer comprising a first ionic group and a monovalent counter ion; and
a second water-soluble ethylenically unsaturated monomer comprising a second ionic group and a polyvalent counter ion,
wherein the first water-soluble ethylenically unsaturated monomer and the second water-soluble ethylenically unsaturated monomer are used together,
wherein the first water-soluble ethylenically unsaturated monomer comprises potassium acrylate, a content of said first water-soluble ethylenically unsaturated monomer being not more than 60 mass % in 100 mass % of said photocurable support material composition,
wherein the second water-soluble ethylenically unsaturated monomer comprises zinc acrylate, a content of said second water-soluble ethylenically unsaturated monomer being not less than 1 mass % and not more than 15 mass % in 100 mass % of said photocurable support material composition,
wherein a total content of said first water-soluble ethylenically unsaturated monomer and said second water-soluble ethylenically unsaturated monomer is not more than 70 mass % in 100 mass % of said photocurable support material composition,
wherein a content of the solvent is not more than 74 mass % in 100 mass % of the composition, which comprises 50 mass % or less of water in 100 mass % of the composition,
wherein said photocurable support material composition is able to form a cured product by irradiating said composition with light of 500 mJ/cm2 or 1000 mJ/cm2, and said cured product of said composition is water-soluble such that said cured product is able to be dissolved in water within 1 hour when a piece (1×1×0.5 cm) of said cured product is placed on a wire net and placed in water having a water temperature of 25° C. and volume of 100 mL, and
wherein the photocurable support material composition comprises 5-15 mass % of zinc acrylate and 35-45 mass % of potassium acrylate.