Curable composition, storage container, and three-dimensional object producing method

1 . A curable composition, comprising:

a multifunctional urethane (meth)acrylate monomer, represented as component 1;

a (meth)acrylate monomer, represented as component 2; and

an inorganic filler, represented as component 3,

wherein a mass content ratio (component 1:component 2) of the component 1 to the component 2 is from 65:35 through 40:60.

2 . The curable composition according to claim 1 ,

wherein a refractive index difference Δn25D (1_3) between a refractive index n25D (1) of the component 1 and a refractive index n25D (3) of the component 3 is 0.07 or less.

3 . The curable composition according to claim 1 ,

wherein a refractive index difference Δn25D (2_3) between a refractive index n25D (2) of the component 2 and a refractive index n25D (3) of the component 3 is 0.07 or less, and

a viscosity of the component 2 at 25° C. is 50 mPa·s or lower.

4 . The curable composition according to claim 1 ,

wherein a refractive index n25D (3) of the component 3 is 1.40 or higher and 1.50 or lower.

5 . The curable composition according to claim 1 ,

wherein a refractive index n25D (2) of the component 2 is 1.48 or lower.

6 . The curable composition according to claim 1 ,

wherein the component 2 includes either or both of ethylene glycol dimethacrylate (n=1) and diethylene glycol dimethacrylate (n=2), which are represented by General formula (2) below,

7 . The curable composition according to claim 1 ,

wherein the component 2 includes a monofunctional (meth)acrylate having a refractive index n25D of 1.48 or lower and a viscosity of 50 mPa·s or lower at 25° C.

8 . The curable composition according to claim 1 ,

wherein the component 1 is an aliphatic urethane dimethacrylate represented by Structural formula (1) below, and

a refractive index n25D (1) of the aliphatic urethane dimethacrylate is 1.50 or lower,

9 . The curable composition according to claim 1 ,

wherein a content of the component 3 is 20% by mass or greater and 60% by mass or less relative to a total amount of the component 1 and the component 2.

10 . The curable composition according to claim 1 ,

wherein a volume mean primary particle diameter of the component 3 is 10 nm or greater and 300 nm or less, and

the component 3 includes silica particles.

11 . The curable composition according to claim 10 ,

wherein carbon is contained in surfaces of the silica particles, and

a content of the carbon is 0.5% by mass or greater and 1.5% by mass or less relative to a mass of the silica particles.

12 . The curable composition according to claim 1 ,

wherein a viscosity of the curable composition at 25° C. is 400 mPa·s or lower.

13 . A storage container, comprising

the curable composition of claim 1 ,

wherein the curable composition is stored in the storage container.

14 . A three-dimensional object producing method, comprising:

discharging the curable composition of claim 1 by an inkjet method; and

curing the curable composition by irradiation with active energy rays.

15 . The curable composition according to claim 1 , wherein the content of the component 1 is 40% by mass or greater relative to the whole amount of the curable composition.

16 . The curable composition according to claim 15 , wherein the content of the component 2 is 35% by mass or greater.

17 . The curable composition according to claim 1 , wherein the inorganic filler content in the composition is about 19% to about 39%.

18 . The curable composition according to claim 12 , wherein the inorganic filler content in the composition is about 19% to about 39%.

19 . The curable composition according to claim 12 ,

wherein the content of the component 1 is 40% by mass or greater and 65% by mass or less relative to the whole amount of the curable composition,

wherein the content of the component 2 is 35% by mass or greater and 60% by mass or less relative to the whole amount of the curable composition, and

wherein the content of the component 3 is 19% by mass or greater and 60% by mass or less relative to a total amount of the component 1 and the component 2.

20 . The curable composition according to claim 12 , wherein the content of the component 1 is 50% by mass or greater and 60% by mass or less relative to the whole amount of the curable composition,

wherein the content of the component 2 is 40% by mass or greater and 50% by mass or less relative to the whole amount of the curable composition, and

wherein the content of the component 3 is 19% by mass or greater and 40% by mass or less relative to a total amount of the component 1 and the component 2.