Flexible substrates including a polymer selected from a thermoplastic polymer, a thermoset polymer, and/or a polymer blend, and ferroelectric perovskite-type oxide particles dispersed in the polymer, where the ferroelectric perovskite-type oxide has a dielectric constant that varies with applied voltage. The flexible substrates can be used in tunable electronics.

A method for producing a hydroxyl group-containing vinyl ether polymer according to the present invention includes: a step of radical polymerizing at least one vinyl ether selected from vinyl ether having a hydroxyl group represented by the following formula (2): ##STR00001## wherein R.sup.7 represents an alkylene group which is straight-chained, branched or comprises an alicyclic structure, and p is 1, 2, or 3, in the presence of water as a polymerization solvent and an azo compound represented by the following formula (1) as a polymerization initiator: ##STR00002## wherein R.sup.1 to R.sup.4 each independently represent a hydrogen atom or an alkyl group and R.sup.5 and R.sup.6 each independently represent an alkoxy group optionally having a substituent group or an alkyl amino group optionally having a substituent group.

A method for producing a hydroxyl group-containing vinyl ether polymer according to the present invention includes: a step of radical polymerizing at least one vinyl ether selected from vinyl ether having a hydroxyl group represented by the following formula (2): ##STR00001## wherein R.sup.7 represents an alkylene group which is straight-chained, branched or comprises an alicyclic structure, and p is 1, 2, or 3, in the presence of water as a polymerization solvent and an azo compound represented by the following formula (1) as a polymerization initiator: ##STR00002## wherein R.sup.1 to R.sup.4 each independently represent a hydrogen atom or an alkyl group and R.sup.5 and R.sup.6 each independently represent an alkoxy group optionally having a substituent group or an alkyl amino group optionally having a substituent group.

Provided are: a water-soluble composition which has excellent coatability and exhibits low liquid-crystal contamination and whose cured product has high durability; and a cured product composed of the same. The water-soluble composition contains: an acetoacetate group-containing polyvinyl alcohol (A); and at least one crosslinking agent (B) selected from the group consisting of a zirconium compound (B1) and a titanium compound (B2). The water-soluble composition preferably further contains an organic acid (C), and the polyvinyl alcohol may be a homopolymer or a copolymer, which contains vinyl alcohol as an essential monomer.

Provided are: a water-soluble composition which has excellent coatability and exhibits low liquid-crystal contamination and whose cured product has high durability; and a cured product composed of the same. The water-soluble composition contains: an acetoacetate group-containing polyvinyl alcohol (A); and at least one crosslinking agent (B) selected from the group consisting of a zirconium compound (B1) and a titanium compound (B2). The water-soluble composition preferably further contains an organic acid (C), and the polyvinyl alcohol may be a homopolymer or a copolymer, which contains vinyl alcohol as an essential monomer.

Provided are: a water-soluble composition which has excellent coatability and exhibits low liquid-crystal contamination and whose cured product has high durability; and a cured product composed of the same. The water-soluble composition contains: an acetoacetate group-containing polyvinyl alcohol (A); and at least one crosslinking agent (B) selected from the group consisting of a zirconium compound (B1) and a titanium compound (B2). The water-soluble composition preferably further contains an organic acid (C), and the polyvinyl alcohol may be a homopolymer or a copolymer, which contains vinyl alcohol as an essential monomer.

A transparent phosphorescence material includes a mixture of a phosphorescent material powder obtained by pulverizing a phosphorescent material, a resin of a phenol, and a curing agent. The phosphorescent material powder has an average particle diameter of 10 to 20 m, the resin is a modified bisphenol, and the curing agent is an aliphatic polyamine. A mass ratio of the phosphorescent material powder, the resin, and the curing agent in the mixture is such that the phosphorescent material powder is 15 to 25 wt %, the resin is 50 to 70 wt %, and the curing agent is 15 to 25 wt %. When the transparent phosphorescence material is applied to a surface of a metal substrate, the surface of the metal substrate is visible through the transparent phosphorescence material. The transparent phosphorescence material emits a light due to phosphorescence in the dark.

A transparent phosphorescence material includes a mixture of a phosphorescent material powder obtained by pulverizing a phosphorescent material, a resin of a phenol, and a curing agent. The phosphorescent material powder has an average particle diameter of 10 to 20 m, the resin is a modified bisphenol, and the curing agent is an aliphatic polyamine. A mass ratio of the phosphorescent material powder, the resin, and the curing agent in the mixture is such that the phosphorescent material powder is 15 to 25 wt %, the resin is 50 to 70 wt %, and the curing agent is 15 to 25 wt %. When the transparent phosphorescence material is applied to a surface of a metal substrate, the surface of the metal substrate is visible through the transparent phosphorescence material. The transparent phosphorescence material emits a light due to phosphorescence in the dark.

The disclosure relates generally to a solid polymer electrolyte for use in electrochromic devices. The solid polymer electrolyte may include a polymer framework, at least one solid plasticizer, and at least one electrolyte salt.

The disclosure relates generally to a solid polymer electrolyte for use in electrochromic devices. The solid polymer electrolyte may include a polymer framework, at least one solid plasticizer, and at least one electrolyte salt.