Shimadzu Corporation

Maxell, Ltd.

Maxell Holdings, Ltd.

Hiroshi Ota

Katsuyuki Kito

Keisuke Okushiro

Hiroki Sakata

The present invention relates to a resin composition for optical shaping, comprising a polymerizable compound, wherein the polymerizable compound comprises: at least one polyfunctional ethylenically unsaturated monomer (B) having a ring structure other than an isocyanurate ring structure; and at least one polyfunctional ethylenically unsaturated monomer (C) having an isocyanurate ring structure, and a content of the monomer (C) is 5 to 80 parts by mass based on 100 parts by mass of the resin composition for optical shaping, and a content of a monofunctional ethylenically unsaturated monomer (A) is less than 70 parts by mass based on 100 parts by mass of the resin composition for optical shaping.

Photo fabrication resin composition, model material composition, and photo-cured product thereof, and photo fabrication composition set

A model material clear composition comprises an ethylenically unsaturated monomer (Al) having at least one selected from the group consisting of a dicyclopentenyl group and a dicyclopentanyl group, at least one photopolymerization initiator selected from the group consisting of an acylphosphine oxide-based photopolymerization initiator and an α-hydroxyacetophenone-based photopolymerization initiator, a hindered amine-based polymerization inhibitor, and a phenolic antioxidant, and contents (% by mass) of the initiator, the polymerization inhibitor, and the antioxidant satisfy Formula (1): content of photopolymerization initiator≥content of polymerization inhibitor≥content of oxidation inhibitor, and Formula (2): 1≤√ content of photopolymerization initiator/√[(content of polymerization inhibitor×10)+(content of antioxidant×100)]≤800.

Model material clear composition and composition set for optical shaping

An accessory for an infrared spectrophotometer is provided in which both an infrared spectrum and a Raman spectrum at the same measurement position of a sample can be easily acquired. By incorporating an infrared optical system and an excitation light source into the accessory for an infrared spectrophotometer, infrared light from an infrared light source of the infrared spectrophotometer and excitation light from the excitation light source provided for the accessory are guided to the same measurement position P in the sample S. A total reflection spectrum is acquired by detecting the totally reflected light from the sample S irradiated with the infrared light by an infrared detector of the infrared spectrophotometer. Raman scattered light from the sample S irradiated with the excitation light is detected by a Raman detector provided in the accessory. By incorporating the accessory into the infrared spectrophotometer and measuring the sample S, both the infrared spectrum (total reflection spectrum) and the Raman spectrum at the same measurement position P of the sample S can be easily acquired.

Accessory for infrared spectrophotometer

A composition for a support material according to the present invention is to be used in a support material for supporting a model material used to form a shaped article through ink-jet stereolithography and contains polyalkylene glycol having an oxybutylene group, a water-soluble monofunctional ethylenic unsaturated monomer, and a photopolymerization initiator, and the content of the polyalkylene glycol having an oxybutylene group is 15 parts by mass or more and 75 parts by mass or less with respect to the total mass of the composition for a support material taken as 100 parts by mass.

Composition for support material and ink set for stereolithography

A method of obtaining a spectrum in a Fourier transformation infrared spectrophotometer includes the following steps: sampling a set of data while a movable mirror of the Fourier transformation infrared spectrophotometer performs a reciprocal movement, wherein the set of data constitutes an interferogram; judging whether the interferogram is reliable or not by comparing the shape of the interferogram with a shape of another interferogram or shapes of other interferograms obtained through neighboring measurement of measurements; accumulating the data of interferograms that are judged to be reliable; and constituting an absorption spectrum using a Fourier transformation method based on the accumulated data. Since unreliable data are adequately avoided from the data accumulation, the reliability of the accumulated data is assured, and an accurate absorption spectrum can be obtained. Thus, even when a mechanical disturbance or an electrical shock affects the measurement instantaneously, there is no need to repeat the measurement, and the absorption spectrum obtained after the measurement is still reliable. This is especially useful when the sample does not allow a second measurement.

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Kyoto, Japan

Hiroshi Ota