Abstract: An optical fiber includes a glass fiber and a coating resin layer with which the glass fiber is covered, wherein the coating resin layer includes tin and a cured ultraviolet curable resin composition containing 2,4,6-trimethylbenzoyldiphenyl phosphine as a photoinitiator, a percentage of uncured components having a molecular weight of 1000 or less included in the coating resin layer is 15% by mass or less, and a fraction of an amount of a phosphorus-tin complex with respect to an amount of hydrocarbon on the surface of coating resin layer is 1000 ppm or less.

Abstract: An optical fiber comprises a glass fiber and a coating resin layer covering the glass fiber, the coating resin layer having a primary resin layer and a secondary resin layer, the primary resin layer comprising a cured resin composition obtained by curing a resin composition comprising an oligomer, a monomer, and a photopolymerization initiator, wherein the oligomer is a reaction product of a polyol compound, an isocyanate compound, and a hydroxyl group-containing (meth)acrylate compound; a proportion of a primary hydroxyl group of hydroxyl groups included in the polyol compound is 3.5% or less; and a Young's modulus of the secondary resin layer at ?40° C. is 1780 MPa or more.

Abstract: An optical fiber according to an embodiment of the present invention comprises a glass fiber having a core and a cladding covering the core, and a coating resin layer covering the glass fiber, wherein when the adhesion between the glass fiber and the coating resin layer at 85° C. is defined as x and the elastic modulus of the coating resin layer at 85° C. and at a frequency of 11 Hz is defined as y, the x is 0.2 to 0.6 kgf, the y is 600 to 6000 MPa, and the x and the y satisfy a relationship represented by y >222.1e4.7799x.

Abstract: An optical fiber comprises a glass fiber and a coating resin layer covering the glass fiber, the coating resin layer having a primary resin layer and a secondary resin layer, the primary resin layer comprising a cured resin composition obtained by curing a resin composition comprising an oligomer, a monomer, and a photopolymerization initiator, wherein the oligomer is a reaction product of a polyol compound, an isocyanate compound, and a hydroxyl group-containing (meth)acrylate compound; a proportion of a primary hydroxyl group of hydroxyl groups included in the polyol compound is 3.5% or less; and a Young's modulus of the secondary resin layer at ?40° C. is 1780 MPa or more.

Abstract: Provided is a coated optical fiber excellent in both characteristics of the microbending loss resistance and the low-temperature characteristic. The coated optical fiber 1 comprises an optical fiber 10 that has a cladding layer composed of glass formed on an outer periphery of a glass core, a primary coating layer 20 that coats an outer periphery of the optical fiber 10, and a secondary coating layer 30 that coats an outer periphery of the primary coating layer 20, wherein the primary coating layer 20 has a Young's modulus of 1.2 MPa or less, the secondary coating layer 30 has a Young's modulus of 700 MPa or more, and the primary coating layer 20 contains tin in a content of 70 ppm or less.

Abstract: An optical fiber comprises a glass fiber, and a coating resin layer having a primary resin layer and a secondary resin layer, wherein the primary resin layer consists of a cured resin composition containing an oligomer, a monomer and a photopolymerization initiator, the oligomer is a reaction product of a specific polyol compound, a polyisocyanate compound, and a hydroxyl group-containing acrylate compound, the photopolymerization initiator includes 2,4,6-trimethylbenzoyldiphenyl phosphine and 1-hydroxycyclohexyl phenyl ketone at a mass ratio of 5:1 to 1:1, and a content of 2,4,6-trimethylbenzoyldiphenyl phosphine in the resin composition is 1.5 to 2.5% by mass.

Abstract: An optical fiber comprises a glass fiber, and a coating resin layer having a primary resin layer and a secondary resin layer, wherein the primary resin layer consists of a cured resin composition containing an oligomer, a monomer and a photopolymerization initiator, the oligomer is a reaction product of a specific polyol compound, a polyisocyanate compound, and a hydroxyl group-containing acrylate compound, the photopolymerization initiator includes 2,4,6-trimethylbenzoyldiphenyl phosphine and 1-hydroxycyclohexyl phenyl ketone at a mass ratio of 5:1 to 1:1, and a content of 2,4,6-trimethylbenzoyldiphenyl phosphine in the resin composition is 1.5 to 2.5% by mass.

Abstract: An optical fiber includes a glass fiber and a coating resin layer with which the glass fiber is covered, wherein the coating resin layer includes tin and a cured ultraviolet curable resin composition containing 2,4,6-trimethylbenzoyldiphenyl phosphine as a photoinitiator, a percentage of uncured components having a molecular weight of 1000 or less included in the coating resin layer is 15% by mass or less, and a fraction of an amount of a phosphorus-tin complex with respect to an amount of hydrocarbon on the surface of coating resin layer is 1000 ppm or less.

Abstract: An optical fiber capable of achieving both of the ZSA property and the rapid curability is provided. The optical fiber includes a glass optical fiber 13, a primary coating layer 16 that coats an outer periphery of the glass optical fiber 13, and a secondary optical fiber 17 that coats an outer periphery of the primary coating layer 16. Young's modulus of the primary coating layer 16 is 1.2 MPa or less and Young's modulus of the secondary coating layer 17 is 800 MPa or more. Sulfur content of the surface of the glass optical fiber 13 is 0.2% by atom or more. Sulfur is not present in the vicinity of the outer periphery of the primary coating layer 16.

Abstract: The present invention relates to an optical fiber containing a glass fiber and a resinous coating layer that covers a periphery of the glass fiber, in which the resinous coating layer contains an ethanol of 10 mg or less or a methanol of 2 mg or less per gram of the resinous coating layer.

Abstract: An optical fiber capable of achieving both of the ZSA property and the rapid curability is provided. The optical fiber includes a glass optical fiber 13, a primary coating layer 16 that coats an outer periphery of the glass optical fiber 13, and a secondary optical fiber 17 that coats an outer periphery of the primary coating layer 16. Young's modulus of the primary coating layer 16 is 1.2 MPa or less and Young's modulus of the secondary coating layer 17 is 800 MPa or more. Sulfur content of the surface of the glass optical fiber 13 is 0.2% by atom or more. Sulfur is not present in the vicinity of the outer periphery of the primary coating layer 16.

Abstract: The present invention relates to an optical fiber containing a glass fiber and a resinous coating layer that covers a periphery of the glass fiber, in which the resinous coating layer contains an ethanol of 10 mg or less or a methanol of 2 mg or less per gram of the resinous coating layer.

Abstract: Provided is a coated optical fiber excellent in both characteristics of the microbending loss resistance and the low-temperature characteristic. The coated optical fiber 1 comprises an optical fiber 10 that has a cladding layer composed of glass formed on an outer periphery of a glass core, a primary coating layer 20 that coats an outer periphery of the optical fiber 10, and a secondary coating layer 30 that coats an outer periphery of the primary coating layer 20, wherein the primary coating layer 20 has a Young's modulus of 1.2 MPa or less, the secondary coating layer 30 has a Young's modulus of 700 MPa or more, and the primary coating layer 20 contains tin in a content of 70 ppm or less.

Abstract: The invention offers a method of quantitatively analyzing red phosphorus in a resin by the pyrolysis GCMS, the method having a further improved quantification accuracy. The method has the following steps: determining the retention time A of red phosphorus by performing pyrolysis GCMS measurement under a predetermined separating condition; determining the peak strength ratio B of the specimen to be measured by performing pyrolysis GCMS measurement to confirm that a peak of a mass spectrum is detected at the same retention time as the retention time A and by dividing the measured value of the peak area by the quantity of the specimen; confirming that when the height of the peak at an m/z of 124 in the mass spectrum is taken as 10, the height of the peak at an m/z of 62 lies in the 1.82-2.06 range and the height of the peak at an m/z of 93 lies in the 1.03-1.

Abstract: Provided are a method for preparing a standard sample in which a uniform dispersion of a predetermined concentration of red phosphorus is guaranteed even in a very small amount, and an analytical method for quantitatively determining red phosphorus contained in a resin by pyrolysis-GC/MS, in which the standard sample is used. The method for producing a standard sample for quantitatively determining red phosphorus contained in a resin includes the steps of preparing a red-phosphorus-containing compound by weighing a predetermined amount of red phosphorus and uniformly mixing the red phosphorus in a resin; decreasing the number of particles having a maximum diameter of 5 ?m or more to 1/20 or less of the number of particles having a maximum diameter of 1 ?m or more and less than 5 ?m by pulverizing the red-phosphorus-containing compound; and obtaining a standard sample by weighing about 0.05 to 10 mg, preferably about 0.1 to 0.5 mg of the pulverized red-phosphorus-containing compound.

Abstract: Provided are a method for preparing a standard sample in which a uniform dispersion of a predetermined concentration of red phosphorus is guaranteed even in a very small amount, and an analytical method for quantitatively determining red phosphorus contained in a resin by pyrolysis-GC/MS, in which the standard sample is used. The method for producing a standard sample for quantitatively determining red phosphorus contained in a resin includes the steps of preparing a red-phosphorus-containing compound by weighing a predetermined amount of red phosphorus and uniformly mixing the red phosphorus in a resin; decreasing the number of particles having a maximum diameter of 5 ?M or more to 1/20 or less of the number of particles having a maximum diameter of 1 ?m or more and less than 5 ?m by pulverizing the red-phosphorus-containing compound; and obtaining a standard sample by weighing about 0.05 to 10 mg, preferably about 0.1 to 0.5 mg of the pulverized red-phosphorus-containing compound.

Abstract: A method for simply and rapidly analyzing inorganic phosphorus contained in an organic material and an apparatus for analyzing for carrying out the method of analyzing are provided. The method for analyzing inorganic phosphorus contained in an organic material includes the steps of pyrolyzing a sample composed of an organic material to gasify the sample, separating the pyrolyzed sample to fractions by gas chromatography, and detecting a fraction of a retention time corresponding to the inorganic phosphorus. The apparatus for analyzing inorganic phosphorus contained in an organic material includes gasification means for pyrolyzing a sample, and a gas chromatograph including a column for separating the pyrolyzed sample to fractions and a detector of a gas eluted from the column.

Abstract: A method for simply and rapidly analyzing inorganic phosphorus contained in an organic material and an apparatus for analyzing for carrying out the method of analyzing are provided. The method for analyzing inorganic phosphorus contained in an organic material includes the steps of pyrolyzing a sample composed of an organic material to gasify the sample, separating the pyrolyzed sample to fractions by gas chromatography, and detecting a fraction of a retention time corresponding to the inorganic phosphorus. The apparatus for analyzing inorganic phosphorus contained in an organic material includes gasification means for pyrolyzing a sample, and a gas chromatograph including a column for separating the pyrolyzed sample to fractions and a detector of a gas eluted from the column.

Abstract: To provide a non-crosslinked flame-retardant resin composition delivering excellent heat resistance without deteriorating over a long period of time, as well as possessing sufficient flame retardancy, mechanical properties, flexibility and workability, and an insulated wire and a wiring harness using the same. The non-crosslinked flame-retardant resin composition includes (B) a metallic hydrate, (C) a hindered phenolic antioxidant, (D) a sulfurous antioxidant, and (E) a metallic oxide in (A) a non-crosslinked base resin which includes a propylene resin containing 50 wt % or more of propylene monomer. It is preferable to utilize an imdazole compound as the ingredient (D) and an oxide of zinc as the ingredient (E). In addition, the composition is used as an insulated covering material for a non-halogenous insulated wire, which is used in a wire bundle of the wiring harness.

Abstract: To provide a non-crosslinked flame-retardant resin composition delivering excellent heat resistance without deteriorating over a long period of time, as well as possessing sufficient flame retardancy, mechanical properties, flexibility and workability, and an insulated wire and a wiring harness using the same. The non-crosslinked flame-retardant resin composition includes (B) a metallic hydrate, (C) a hindered phenolic antioxidant, (D) a sulfurous antioxidant, and (E) a metallic oxide in (A) a non-crosslinked base resin which includes a propylene resin containing 50 wt % or more of propylene monomer. It is preferable to utilize an imdazole compound as the ingredient (D) and an oxide of zinc as the ingredient (E). In addition, the composition is used as an insulated covering material for a non-halogenous insulated wire, which is used in a wire bundle of the wiring harness.