Abstract: An optical waveguide contains a lower cladding layer, a patterned core layer, an upper cladding layer and an upper low elasticity layer, which are laminated in this order, in which a film formed by curing a resin composition for forming the upper low elasticity layer has a tensile elastic modulus of from 1 to 2,000 MPa at 25° C., and a cured film having a thickness of 110 ?m formed by curing a resin composition for forming the upper cladding layer has a total light transmittance of 90% or more. An optical waveguide that has good flexural resistance and good optical characteristics can be provided.

Abstract: A resin composition for forming an optical waveguide, containing (A) a polyhydroxy polyether having an ethylenically unsaturated group on a side chain and an aromatic ring on a main chain, (B) a polymerizable compound having an ethylenically unsaturated group, and (C) a radical polymerization initiator; a resin film for forming an optical waveguide; and an optical waveguide having a core part formed by using the resin film for forming an optical waveguide.

Abstract: Provided are a photosensitive resin composition capable of being quickly cured by light and providing an optically cured product which is excellent in a transparency in a visible light of 400 to 780 nm and a heat resistant reliability, a photosensitive resin varnish, a photosensitive resin film and a photosensitive resin cured product. The photosensitive resin composition comprises (A) a polymerizable compound, (B) a polymerization initiator and (C) a hindered phenol base antioxidant, wherein (B-1) at least one selected from ?-hydroxyacetophenone base photoinitiator and a glyoxy ester base photoinitiator and (B-2) a phosphine oxide base photoinitiator are contained as the component (B); the component (C) is a hindered phenol base antioxidant having in a molecule, at least one phenol group having each one group of a methyl group and a t-butyl group on the same aromatic ring; a content of the component (B) is 0.02 to 4.

Abstract: A polyimide resin including repeating units represented by formula (1): wherein R is a diamine residue or a diisocyanate residue; m is an integer of 2 to 30; any of silicon atoms bonded to norbornane rings is in exo configuration with respect to the norbornane rings; and any of imide rings bonded to the norbornane rings is in exo configuration with respect to the norbornane rings, and a polyamic acid resin including repeating units represented by formula (2): wherein R is a diamine residue; m is an integer of 2 to 30; any of silicon atoms bonded to norbornane rings is in exo configuration with respect to the norbornane rings; and any of amide groups and carboxyl groups bonded to the norbornane rings is in exo configuration with respect to the norbornane rings. The polyimide resin is soluble in general-purpose solvents, has a good transparency and a high molecular weight, and is excellent in mechanical properties, such as tensile strength and elongation.

Abstract: The present invention provides a resin composition and film for forming a cladding layer of an optical waveguide, which composition contains (A) a (meth)acrylic polymer having a weight average molecular weight more than 100,000, (B) a urethane (meth)acrylate, and (D) a radical polymerization initiator; and an optical waveguide and an optical module produced by use of the composition or film. There can be provided a resin composition for forming a cladding layer and a resin film for forming a cladding layer, which exhibit excellent bending durability and twisting durability, and an optical waveguide and an optical module each produced therefrom.

Abstract: The invention relates to a tetracarboxylic dianhydride represented by the following formula (1). [In formula (1) R1, R2, R3 and R4 each independently represent an alkyl group having from 1 to 5 carbon atoms, m represents a number from 1 to 30, all of the silicon atoms bonding to the norbornane rings are in an exo-configuration with respect to the norbornane rings, and all of the dicarboxylic anhydride groups bonding to the norbornane rings are in an exo-configuration with respect to the norbornane rings.

Abstract: A polyimide resin including repeating units represented by formula (1): wherein R is a diamine residue or a diisocyanate residue; m is an integer of 2 to 30; any of silicon atoms bonded to norbornane rings is in exo configuration with respect to the norbornane rings; and any of imide rings bonded to the norbornane rings is in exo configuration with respect to the norbornane rings, and a polyamic acid resin including repeating units represented by formula (2): wherein R is a diamine residue; m is an integer of 2 to 30; any of silicon atoms bonded to norbornane rings is in exo configuration with respect to the norbornane rings; and any of amide groups and carboxyl groups bonded to the norbornane rings is in exo configuration with respect to the norbornane rings. The polyimide resin is soluble in general-purpose solvents, has a good transparency and a high molecular weight, and is excellent in mechanical properties, such as tensile strength and elongation.

Abstract: The present invention relates to a resin composition for an optical material comprising (A) a carboxylic acid-modified phenoxy resin, (B) a polymerizable compound and (C) a polymerization initiator, a resin film for an optical material comprising the above resin composition and an optical waveguide having a core part and/or a cladding layer formed by using the same. Provided are a resin composition for an optical material which is excellent in a heat resistance and a transparency and which is soluble in an alkaline aqueous solution, a resin film for an optical material comprising the above resin composition and an optical waveguide produced by using the same.

Abstract: The present invention relates to a phenoxy resin for an optical material obtained by subjecting at least one selected from specific difunctional epoxy resins and at least one selected from specific difunctional phenols to polyaddition reaction, wherein a film comprising the above phenoxy resin has a refractive index of 1.580 or less at 25° C. and a wavelength of 830 nm, a resin composition for an optical material containing the above phenoxy resin, a resin film for an optical material comprising the above resin composition and an optical waveguide produced by using the above resin composition and/or the above resin film.

Abstract: The present invention relates to a flexible optical waveguide prepared by using a resin film for forming an optical waveguide for at least one of a lower cladding layer, a core layer and an upper cladding layer, wherein a ten point average roughness (Rz) on a surface of either one of the lower cladding layer and the upper cladding layer is 0.5 ?m or more and 10 ?m or less, a production process for the same and an optical module prepared by using the flexible optical waveguide. Provided are a flexible optical waveguide which is excellent in an adhesive property in compounding with an electric printed wiring board and turning a flexible optical waveguide into a multilayer, a production process for the same and an optical module prepared by using the flexible optical waveguide.

Abstract: Disclosed, among other features, is a flexible optical waveguide, having one resin film for forming a core layer and two resin films for forming a cladding layer. At least one of the resin films for forming the cladding layer is composed of a resin for forming a cladding layer and a base material film, and the base material film is arranged on an outer side of the cladding layer with respect to the core layer.

Abstract: Provided are a photosensitive resin composition capable of being quickly cured by light and providing an optically cured product which is excellent in a transparency in a visible light of 400 to 780 nm and a heat resistant reliability, a photosensitive resin varnish, a photosensitive resin film and a photosensitive resin cured product. The photosensitive resin composition comprises (A) a polymerizable compound, (B) a polymerization initiator and (C) a hindered phenol base antioxidant, wherein (B-1) at least one selected from ?-hydroxyacetophenone base photoinitiator and a glyoxy ester base photoinitiator and (B-2) a phosphine oxide base photoinitiator are contained as the component (B); the component (C) is a hindered phenol base antioxidant having in a molecule, at least one phenol group having each one group of a methyl group and a t-butyl group on the same aromatic ring; a content of the component (B) is 0.02 to 4.

Abstract: [Problem] Provided include: a resin composition for forming an optical waveguide, the resin composition having high productivity and being capable forming a thick film with high accuracy excellent in transparency, heat resistance and toughness; a resin film for forming an optical waveguide; and an optical waveguide excellent in transparency, environmental reliability and heat resistance. [Means for Solution] A resin composition for forming an optical waveguide, containing (A) a polyhydroxy polyether having an ethylenically unsaturated group on a side chain and an aromatic ring on a main chain, (B) a polymerizable compound having an ethylenically unsaturated group, and (C) a radical polymerization initiator; a resin film for forming an optical waveguide; and an optical waveguide having a core part formed by using the resin film for forming an optical waveguide.

Abstract: The invention relates to a tetracarboxylic dianhydride represented by the following formula (1). [In formula (1) R1, R2, R3 and R4 each independently represent an alkyl group having from 1 to 5 carbon atoms, m represents a number from 1 to 30, all of the silicon atoms bonding to the norbornane rings are in an exo-configuration with respect to the norbornane rings, and all of the dicarboxylic anhydride groups bonding to the norbornane rings are in an exo-configuration with respect to the norbornane rings.

Abstract: An optical waveguide contains a lower cladding layer, a patterned core layer, an upper cladding layer and an upper low elasticity layer, which are laminated in this order, in which a film formed by curing a resin composition for forming the upper low elasticity layer has a tensile elastic modulus of from 1 to 2,000 MPa at 25° C., and a cured film having a thickness of 110 ?m formed by curing a resin composition for forming the upper cladding layer has a total light transmittance of 90% or more.— An optical waveguide that has good flexural resistance and good optical characteristics can be provided.

Abstract: A resin composition for an optical material, which is excellent in heat resistance and transparency and is soluble in an aqueous alkali solution, a resin film for an optical material made of the resin composition, and an optical waveguide using the same are provided. The resin composition for an optical material includes: (A) an alkali-soluble (meth)acrylate polymer containing a maleimide skeleton in a main chain; (B) a polymerizable compound; and (C) a polymerization initiator. The resin film for an optical material is made of the resin composition for an optical material. The optical waveguide has a core part and/or a clad layer formed using the resin composition for an optical material or the resin film for an optical material.

Abstract: A resin composition for an optical material, which is excellent in heat resistance and transparency and is soluble in an aqueous alkali solution, a resin film for an optical material made of the resin composition, and an optical waveguide using the same are provided. The resin composition for an optical material includes: (A) an alkali-soluble (meth)acrylate polymer containing a maleimide skeleton in a main chain; (B) a polymerizable compound; and (C) a polymerization initiator. The resin film for an optical material is made of the resin composition for an optical material. The optical waveguide has a core part and/or a clad layer formed using the resin composition for an optical material or the resin film for an optical material.

Abstract: The present invention provides a resin composition and film for forming a cladding layer of an optical waveguide, which composition contains (A) a (meth)acrylic polymer having a weight average molecular weight more than 100,000, (B) a urethane (meth)acrylate, and (D) a radical polymerization initiator; and an optical waveguide and an optical module produced by use of the composition or film. There can be provided a resin composition for forming a cladding layer and a resin film for forming a cladding layer, which exhibit excellent bending durability and twisting durability, and an optical waveguide and an optical module each produced therefrom.

Abstract: A resin composition for an optical material, which is excellent in heat resistance and transparency and is soluble in an aqueous alkali solution, a resin film for an optical material made of the resin composition, and an optical waveguide using the same are provided. The resin composition for an optical material includes: (A) an alkali-soluble (meth)acrylate polymer containing a maleimide skeleton in a main chain; (B) a polymerizable compound; and (C) a polymerization initiator. The resin film for an optical material is made of the resin composition for an optical material. The optical waveguide has a core part and/or a clad layer formed using the resin composition for an optical material or the resin film for an optical material.

Abstract: The present invention relates to an optical waveguide prepared by laminating a first cladding layer, a patterned core layer and a second cladding layer in this order on a base material, wherein the core layer has a height of 20 ?m or more, and a curing rate in a range of 10 ?m from a circumference of the core layer in the second cladding layer is 95% or more.