Curable composition, cured product, and laminate

1. A curable composition comprising:

(A) particles prepared by bonding at least one oxide of an element selected from the group consisting of silicon, aluminum, zirconium, titanium, zinc, germanium, indium, tin, antimony, and cerium, and an organic compound which comprises a polymerizable group,

(B) a compound having a melamine group and one or more polymerizable groups,

(C) a compound having at least two polymerizable groups in the molecule other than the component (B), and

(D) an acid generator,

wherein said acid generator is an aromatic halonium salt.

2. The curable composition according to claim 1 , wherein the polymerizable groups of compounds (A), (B) and (C) are polymerizable unsaturated groups.

3. The curable composition according to claim 1 , wherein the organic compound included in the particles of the component (A) comprises a group shown by the following formula (1) in addition to the polymerizable unsaturated group:

wherein X represents NH, O (oxygen atom), or S (sulfur atom), and Y represents O or S.

4. The curable composition according to claim 1 , wherein compound B is a melamine (meth)acrylate compound.

5. The curable composition according to claim 4 , wherein the melamine (meth)acrylate compound of the component (B) is at least one of the compounds shown by the following formulas (2) and (3):

wherein R 1 and R 2 represent a C 1 -C 10 alkyl group or a (meth)acryloyloxyalkyl group, each X individually represents a C 1 -C 10 alkyl group or a (meth)acryloyloxyalkyl group, provided that at least one X among 4n Xs is a (meth)acryloyloxyalkyl group, and n is an integer from 1 to 20;

wherein each X′ individually represents a C 1 -C 10 alkyl group or a (meth)acryloyloxyalkyl group, with one to five X's among six X's being a lower alkyl group.

6. The curable composition according to claim 1 , wherein the melamine (meth)acrylate compound of the component (B) is a condensation product made from

(i) 2-hydroxyethyl acrylate and

(ii) the condensation product of melamine, formaldehyde, and an alkyl monohydric alcohol having 1-12 carbon atoms.

7. The curable composition according to claim 1 , wherein the content of compound (B) is from 0.01 to 30 wt % of the total weight of the components (A), (B), and (C).

8. The curable composition according to claim 1 , wherein the composition further comprises (E) a radical photoinitiator.

9. A cured product produced by curing the curable composition according to claim 1 .

10. Process for producing a laminate comprising:

applying a curable composition as defined in claim 1 , on a substrate,

curing the curable composition to form a cured film, and

laminating a film with a low refractive index on the cured film.

11. Laminate obtained by the process of claim 10 .

12. The composition of claim 1 , wherein said acid generator is selected from the group consisting of aliphatic sulfonic acids, aliphatic sulfonates, aliphatic carboxylic acids, aliphatic carboxylates, aromatic carboxylic acids, aromatic carboxylates, alkylbenzene sulfonic acids, alkylbenzene sulfonates, phosphates, and metal salts.

13. The process of claim 10 , wherein said refractive index is in the range of 1.38-1.45.

14. Laminate obtained by the process of claim 13 .

15. The laminate of claim 11 , wherein said laminate is an antireflection film for film-type liquid crystal elements, touch panels, or plastic optical parts.

16. The laminate of claim 14 , wherein said laminate is an antireflection film for film-type liquid crystal elements, touch panels, or plastic optical parts.