Provided are hollow particles which are more excellent in heat resistance and dispersibility than ever before and which are lightweight. The hollow particles containing hollow resin particles having a surface covered with inorganic fine particles, wherein a volume average particle diameter of the hollow particles is from 0.1 μm to 9.0 μm, and a void ratio thereof is from 55% to 95%; wherein a repeating unit constituting the resin of the hollow resin particles contains a crosslinkable monomer unit, and a content of the crosslinkable monomer unit is from 25 to 100 parts by mass, with respect to 100 parts by mass of the resin; wherein a primary particle diameter of the inorganic fine particles is from 10 nm to 120 nm; and wherein the inorganic fine particles are contained at from 5 to 180 parts by mass, with respect to 100 parts by mass of the hollow resin particles.

Provided are hollow particles which are more excellent in heat resistance and dispersibility than ever before and which are lightweight. The hollow particles containing hollow resin particles having a surface covered with inorganic fine particles, wherein a volume average particle diameter of the hollow particles is from 0.1 μm to 9.0 μm, and a void ratio thereof is from 55% to 95%; wherein a repeating unit constituting the resin of the hollow resin particles contains a crosslinkable monomer unit, and a content of the crosslinkable monomer unit is from 25 to 100 parts by mass, with respect to 100 parts by mass of the resin; wherein a primary particle diameter of the inorganic fine particles is from 10 nm to 120 nm; and wherein the inorganic fine particles are contained at from 5 to 180 parts by mass, with respect to 100 parts by mass of the hollow resin particles.

An object of the present invention is to provide a photocurable resin composition that has excellent adhesion to plastic substrates and can form a composition with good compatibility. The present invention relates to a photocurable resin composition containing: an allylic polymer (A) produced by polymerization of an allylic compound represented by the formula (I) below; and a tackifier resin (B),

##STR00001##

An object of the present invention is to provide a photocurable resin composition that has excellent adhesion to plastic substrates and can form a composition with good compatibility. The present invention relates to a photocurable resin composition containing: an allylic polymer (A) produced by polymerization of an allylic compound represented by the formula (I) below; and a tackifier resin (B),

##STR00001##

Provided is a photocurable resin composition containing an allylic polymer (A) which has excellent adhesion to plastic substrates. The present invention relates to a photocurable resin composition containing an allylic polymer (A), the allylic polymer (A) being produced by polymerization of an allylic compound represented by the following formula (I):

##STR00001##

Provided is a photocurable resin composition containing an allylic polymer (A) which has excellent adhesion to plastic substrates. The present invention relates to a photocurable resin composition containing an allylic polymer (A), the allylic polymer (A) being produced by polymerization of an allylic compound represented by the following formula (I):

##STR00001##

Provided is an optically anisotropic layer having an excellent surface condition, with which an image display device having an excellent contrast can be manufactured; and an optical film, a polarizing plate, and an image display device, each having the optically anisotropic layer. The optically anisotropic layer is obtained by immobilizing a polymerizable liquid crystal composition including a polymerizable rod-shaped liquid crystal compound exhibiting a liquid crystal state of a smectic phase and an additive in a liquid crystal state of a smectic phase, in which a molecular length A (Å) of the polymerizable rod-shaped liquid crystal compound, a layer interval B (Å) of the smectic phase of the optically anisotropic layer, and a molecular length C (Å) of the additive satisfy a relationship of Expression (1-1), 0.5×B≤C≤0.6×A . . . (1-1).

An object of the present invention is to provide a photo-alignable polymer which has excellent coating properties, is capable of suppressing film thickness unevenness, and has excellent upper layer coating properties and good liquid crystal alignment properties after being formed as a layer; a binder composition; a binder layer; an optical laminate; a method for producing an optical laminate; and an image display device. The photo-alignable polymer of an embodiment of the present invention is a photo-alignable polymer having a repeating unit A including a cleavage group capable of decomposing by an action of at least one selected from the group consisting of light, heat, an acid, and a base to generate a polar group, in which the repeating unit A has the cleavage group in a side chain, has a fluorine atom or a silicon atom on a side closer to a terminal than the cleavage group in the side chain, and the photo-alignable polymer satisfies Condition 1 or Condition 2 shown below. Condition 1: The photo-alignable polymer further has a repeating unit B including a photo-alignable group, in addition to the repeating unit A. Condition 2: The repeating unit A includes a photo-alignable group on a side closer to the main chain than the cleavage group in the side chain.

An object of the present invention is to provide a photo-alignable polymer which has excellent coating properties, is capable of suppressing film thickness unevenness, and has excellent upper layer coating properties and good liquid crystal alignment properties after being formed as a layer; a binder composition; a binder layer; an optical laminate; a method for producing an optical laminate; and an image display device. The photo-alignable polymer of an embodiment of the present invention is a photo-alignable polymer having a repeating unit A including a cleavage group capable of decomposing by an action of at least one selected from the group consisting of light, heat, an acid, and a base to generate a polar group, in which the repeating unit A has the cleavage group in a side chain, has a fluorine atom or a silicon atom on a side closer to a terminal than the cleavage group in the side chain, and the photo-alignable polymer satisfies Condition 1 or Condition 2 shown below. Condition 1: The photo-alignable polymer further has a repeating unit B including a photo-alignable group, in addition to the repeating unit A. Condition 2: The repeating unit A includes a photo-alignable group on a side closer to the main chain than the cleavage group in the side chain.

The present invention relates to novel compounds, particularly to compounds comprising a photoactive unit, said novel compounds being particularly suitable for ophthalmic devices as well as to ophthalmic devices comprising such compounds.