An object of the present disclosure is to provide a rubber composition from which a crosslinked rubber molded product having good softness and excellent resilience performance can be obtained. The present disclosure provides a rubber composition containing (a) a base rubber, (b) a co-crosslinking agent, (c) a crosslinking initiator, and (d) an organic sulfur compound, wherein (d) the organic sulfur compound includes (d1) a polythiophene compound having two or more thiophene rings in the molecule.

Fluorescent pigment is introduced into the plastic composition, preferably a thermoplastic, especially polyethylene or polypropylene, in the granules formation stage, in addition to possible standard components of the composite, mixed, granules are formed, and then the granules are formed into a finished building material component, and then, with the help of a known fluorimeter, the fluorescence intensity of individual parts of the surface of a plastic element is measured and the homogeneity of the material is inferred on the basis of the differences in the results of the fluorescence intensity measurements.

Fluorescent pigment is introduced into the plastic composition, preferably a thermoplastic, especially polyethylene or polypropylene, in the granules formation stage, in addition to possible standard components of the composite, mixed, granules are formed, and then the granules are formed into a finished building material component, and then, with the help of a known fluorimeter, the fluorescence intensity of individual parts of the surface of a plastic element is measured and the homogeneity of the material is inferred on the basis of the differences in the results of the fluorescence intensity measurements.

Fluorescent pigment is introduced into the plastic composition, preferably a thermoplastic, especially polyethylene or polypropylene, in the granules formation stage, in addition to possible standard components of the composite, mixed, granules are formed, and then the granules are formed into a finished building material component, and then, with the help of a known fluorimeter, the fluorescence intensity of individual parts of the surface of a plastic element is measured and the homogeneity of the material is inferred on the basis of the differences in the results of the fluorescence intensity measurements.

A colorant which has high heat resistance and thus causes neither discoloration nor fading even when exposed for a long period of time under long-term high-temperature conditions, and which has excellent bleed resistance and sublimation resistance and thus causes neither color migration to molds or other resin components, nor deterioration of physical properties of a thermoplastic resin added thereto. The colorant includes at least one compound represented by a specified chemical formula (1a), at least one compound represented by a specified chemical formula (1b), and/or at least one compound represented by a specified chemical formula (1c).

A colorant which has high heat resistance and thus causes neither discoloration nor fading even when exposed for a long period of time under long-term high-temperature conditions, and which has excellent bleed resistance and sublimation resistance and thus causes neither color migration to molds or other resin components, nor deterioration of physical properties of a thermoplastic resin added thereto. The colorant includes at least one compound represented by a specified chemical formula (1a), at least one compound represented by a specified chemical formula (1b), and/or at least one compound represented by a specified chemical formula (1c).

The present invention relates to an optical filter including: a substrate; and a dielectric multilayer film laid on or above at least one major surface of the substrate, as an outermost layer, in which: the substrate includes a resin film containing a dye (U) having a maximum absorption wavelength in a range of 360 to 395 nm in dichloromethane, a dye (A) having a maximum absorption wavelength in a range of 600 to 800 nm in dichloromethane, and a resin; and the optical filter satisfies spectral characteristics (i-1) to (i-5).

The present invention relates to an optical filter including: a substrate; and a dielectric multilayer film laid on or above at least one major surface of the substrate, as an outermost layer, in which: the substrate includes a resin film containing a dye (U) having a maximum absorption wavelength in a range of 360 to 395 nm in dichloromethane, a dye (A) having a maximum absorption wavelength in a range of 600 to 800 nm in dichloromethane, and a resin; and the optical filter satisfies spectral characteristics (i-1) to (i-5).

A process can be used for manufacturing a coloured moulding composition with an improved optical appearance and a particularly high thermal stability. The process involves providing a thermoplastic polymer and adding a colouring preparation, or a liquid composition or a master batch containing the colouring preparation. Injection moulded parts and extruded parts can be composed of the coloured moulding composition.

A process can be used for manufacturing a coloured moulding composition with an improved optical appearance and a particularly high thermal stability. The process involves providing a thermoplastic polymer and adding a colouring preparation, or a liquid composition or a master batch containing the colouring preparation. Injection moulded parts and extruded parts can be composed of the coloured moulding composition.