Embodiments of an optical adhesive are provided. The optical adhesive includes about 20% to about 60% by volume of first monomers. The first monomers have at least two acrylate or methacrylate groups. The optical adhesive also includes about 40% to about 80% by volume of second monomers. The second monomers have at least one fluorine atom and at least one acrylate or methacrylate group. The optical adhesive has a refractive index of from about 1.40 to about 1.55, and in the temperature range of about 10 C. to about 85 C., the refractive index of the optical adhesive has a thermal drift do/dT of less than about 410.sup.4/ C. Embodiments of a mechanical joint between two optical fiber segments using the optical adhesive and embodiments of a method for joining two optical fiber segements are also provided.

Embodiments of an optical adhesive are provided. The optical adhesive includes about 20% to about 60% by volume of first monomers. The first monomers have at least two acrylate or methacrylate groups. The optical adhesive also includes about 40% to about 80% by volume of second monomers. The second monomers have at least one fluorine atom and at least one acrylate or methacrylate group. The optical adhesive has a refractive index of from about 1.40 to about 1.55, and in the temperature range of about 10 C. to about 85 C., the refractive index of the optical adhesive has a thermal drift do/dT of less than about 410.sup.4/ C. Embodiments of a mechanical joint between two optical fiber segments using the optical adhesive and embodiments of a method for joining two optical fiber segements are also provided.

An object of the present invention is to provide a photosensitive resin composition having good liquid repellency. The photosensitive resin composition of the present invention at least contains a fluororesin having a crosslinking site, a solvent, and a photopolymerization initiator, and the fluororesin contains a repeating unit derived from a hydrocarbon having a fluorine atom.

An object of the present invention is to provide a photosensitive resin composition having good liquid repellency. The photosensitive resin composition of the present invention at least contains a fluororesin having a crosslinking site, a solvent, and a photopolymerization initiator, and the fluororesin contains a repeating unit derived from a hydrocarbon having a fluorine atom.

A chloroprene-unsaturated nitrile copolymer composition containing 100 parts by mass of a chloroprene-unsaturated nitrile copolymer having 3 to 20% by mass of a structural unit derived from an unsaturated nitrile monomer, and 0.05 to 2.0 parts by mass of a xanthogen compound.

A chloroprene-unsaturated nitrile copolymer composition containing 100 parts by mass of a chloroprene-unsaturated nitrile copolymer having 3 to 20% by mass of a structural unit derived from an unsaturated nitrile monomer, and 0.05 to 2.0 parts by mass of a xanthogen compound.

Embodiments of an optical assembly and methods of making it are provided. The optical assembly includes a first waveguide, a second waveguide, and an optical adhesive for transmitting optical signals between the first waveguide and the second waveguide. The adhesive includes about 20% to about 60% by volume of first monomers. The first monomers have at least two acrylate or methacrylate groups. The optical adhesive also includes about 40% to about 80% by volume of second monomers. The second monomers have at least one fluorine atom and at least one acrylate or methacrylate group. The optical adhesive has a refractive index of from about 1.40 to about 1.55, and in the temperature range of about 10 C. to about 85 C., the refractive index of the optical adhesive has a thermal drift dn/dT of less than the absolute magnitude of |410.sup.4/ C.| and the sign of that value is negative.

Embodiments of an optical assembly and methods of making it are provided. The optical assembly includes a first waveguide, a second waveguide, and an optical adhesive for transmitting optical signals between the first waveguide and the second waveguide. The adhesive includes about 20% to about 60% by volume of first monomers. The first monomers have at least two acrylate or methacrylate groups. The optical adhesive also includes about 40% to about 80% by volume of second monomers. The second monomers have at least one fluorine atom and at least one acrylate or methacrylate group. The optical adhesive has a refractive index of from about 1.40 to about 1.55, and in the temperature range of about 10 C. to about 85 C., the refractive index of the optical adhesive has a thermal drift dn/dT of less than the absolute magnitude of |410.sup.4/ C.| and the sign of that value is negative.

The production method of a substrate with a patterned film according to the present disclosure includes: a cleaning step of performing UV/ozone cleaning or oxygen plasma cleaning on a substrate with a patterned film including a substrate and a patterned film on the substrate, to obtain a first substrate with a patterned film; and a heating step of heating the first substrate with a patterned film to obtain a second substrate with a patterned film, wherein the patterned film of the first substrate with a patterned film has a contact angle decreased in the cleaning step, and the patterned film of the second substrate with a patterned film has a contact angle recovered in the heating step.

The production method of a substrate with a patterned film according to the present disclosure includes: a cleaning step of performing UV/ozone cleaning or oxygen plasma cleaning on a substrate with a patterned film including a substrate and a patterned film on the substrate, to obtain a first substrate with a patterned film; and a heating step of heating the first substrate with a patterned film to obtain a second substrate with a patterned film, wherein the patterned film of the first substrate with a patterned film has a contact angle decreased in the cleaning step, and the patterned film of the second substrate with a patterned film has a contact angle recovered in the heating step.