A UV-curable and recyclable thermoset shape memory polymer is provided. The polymer includes a vitrimer-based monomer and a photoinitiator. The vitrimer-based monomer includes a first unit rendering a high chain stiffness upon polymerization of the monomer, and a second photopolymerizable unit for photopolymerization of the monomer under a UV irradiation. The polymer has high strength, high stiffness, high recovery stress, high energy storage, reasonable recycling efficiency, and is printable using SLA with high resolution.

A photocurable resin composition includes a specific modified polyphenylene ether resin, a specific bifunctional acrylic resin, a photopolymerization initiator and a coupling agent in a specific ratio. Curing of the photocurable resin composition can be achieved satisfactorily by irradiation with a common active energy ray (for example, an ultraviolet ray) without requiring high-temperature treatment.

A photocurable resin composition includes a specific modified polyphenylene ether resin, a specific bifunctional acrylic resin, a photopolymerization initiator and a coupling agent in a specific ratio. Curing of the photocurable resin composition can be achieved satisfactorily by irradiation with a common active energy ray (for example, an ultraviolet ray) without requiring high-temperature treatment.

Provided are an adhesive composition and an organic electronic device (OED) including the same, and particularly, an adhesive composition, which may form a structure effectively blocking moisture or oxygen flowing into an OED from the outside, thereby ensuring the lifespan of the OED, realize a top-emission OED, and exhibit excellent adhesive durability and reliability, and an OED including the same.

Provided are an adhesive composition and an organic electronic device (OED) including the same, and particularly, an adhesive composition, which may form a structure effectively blocking moisture or oxygen flowing into an OED from the outside, thereby ensuring the lifespan of the OED, realize a top-emission OED, and exhibit excellent adhesive durability and reliability, and an OED including the same.

Diffractive optical element includes two resin layers stacked on first substrate. One of the two resin layers is cured article of first resin containing thiol group and sulfide group, the cured article having diffraction grating shape. The other is cured article of second resin, the cured article having diffraction grating shape. When measurement is performed by laser Raman spectroscopy, α<β, where α is the ratio of the intensity of peak corresponding to the sulfide group to the intensity of peak corresponding to the thiol group in first region containing no interface between the cured articles of the first and second resins, and β is the ratio of the intensity of peak corresponding to the sulfide group to the intensity of peak corresponding to the thiol group in second region containing the interface.

Diffractive optical element includes two resin layers stacked on first substrate. One of the two resin layers is cured article of first resin containing thiol group and sulfide group, the cured article having diffraction grating shape. The other is cured article of second resin, the cured article having diffraction grating shape. When measurement is performed by laser Raman spectroscopy, α<β, where α is the ratio of the intensity of peak corresponding to the sulfide group to the intensity of peak corresponding to the thiol group in first region containing no interface between the cured articles of the first and second resins, and β is the ratio of the intensity of peak corresponding to the sulfide group to the intensity of peak corresponding to the thiol group in second region containing the interface.

Two-part cyanoacrylate/free radically curable adhesive systems demonstrating improved toughness are provided.

Two-part cyanoacrylate/free radically curable adhesive systems demonstrating improved toughness are provided.

A resin composition for coating an optical fiber comprises: a base resin containing a photopolymerizable compound and a photopolymerization initiator; and hydrophobic inorganic oxide particles, wherein the photopolymerizable compound comprises urethane (meth)acrylate and aliphatic epoxy (meth)acrylate, and the content of the aliphatic epoxy (meth)acrylate is 1.0% by mass or more and 45% by mass or less based on the total amount of the photopolymerizable compound.