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|1. (WO2018143293) INK SET FOR STEREOLITHOGRAPHY, STEREOLITHOGRAPHIC ARTICLE, AND METHOD FOR PRODUCING STEREOLITHOGRAPHIC ARTICLE|
|Applicants:||MAXELL HOLDINGS, LTD.
|Title:||INK SET FOR STEREOLITHOGRAPHY, STEREOLITHOGRAPHIC ARTICLE, AND METHOD FOR PRODUCING STEREOLITHOGRAPHIC ARTICLE|
The present invention relates to an ink set for stereolithography which is provided with a model material composition and a support material composition. The model material composition includes monofunctional ethylenically unsaturated monomers (A) and polyfunctional ethylenically unsaturated monomers (B). The monofunctional ethylenically unsatured monomers (A) and/or the polyfunctional ethylenically unsaturated monomers (B) are provided with hydroxyl groups or amino groups. The total molar fraction of the hydroxyl groups and the amino groups is 5-30% of the total amount of the monofunctional ethylenically unsaturated monomers (A) and the polyfunctional ethylenically unsatured monomers (B). Furthermore, the model material composition includes: ethylenically unsaturated monomers (C) of which the homopolymer has a glass transition temperature in the range of 25-120˚C inclusive; ethylenically unsaturated monomers (D) of which the homopolymer has a glass transition temperature of at least -65˚C but less than 25˚C; a bifunctional acrylate oligomer (E) having a weight average molecular weight in the range of 800-10,000 inclusive; and an acyl phosphine oxide compound. The content of bifunctional or higher acrylate compounds is not more than 15 parts by weight with respect to 100 parts by weight of the whole model material composition. The support material composition includes, with respect to 100 parts by weight of the whole support material composition, 20-50 parts by weight of water-soluble monofunctional ethylenically unsaturated monomers (a), 20-49 parts by weight of polyalkylene glycol (b) including oxyethylene groups and/or oxypropylene groups, 35 or fewer parts by weight of a water-soluble organic solvent (c); and a photopolymerization initiator (d).