Abstract: Provided is an immersion oil for microscope including a liquid olefin polymer (A), a liquid diene polymer (B), a diaryl alkane (C), and an alkyl benzene (D), the immersion oil for microscope being capable of maintaining low fluorescence of its own over a long period of time, having good characteristics required for an immersion oil for microscope, such as good refractive index, Abbe number, viscosity, and resolution, and being particularly suitable as an immersion oil for a fluorescence microscope.

Abstract: Provided is an immersion oil for microscope including a liquid olefin polymer (A), a liquid diene polymer (B), a diaryl alkane (C), and an alkyl benzene (D), the immersion oil for microscope being capable of maintaining low fluorescence of its own over a long period of time, having good characteristics required for an immersion oil for microscope, such as good refractive index, Abbe number, viscosity, and resolution, and being particularly suitable as an immersion oil for a fluorescence microscope.

Abstract: The present invention involves a hydrogenated copolymer obtained by hydrogenating a copolymer having a softening point falling in a range of 45 to 55° C. determined by a ball & ring method, wherein the hydrogenated copolymer has a softening point of 85 to 95° C. determined by the ball & ring method, and a hot melt adhesive composition comprising this copolymer hydrogenated product. The hydrogenated copolymer of the present invention has a small weight reduction rate in heating and a good hue after heating. The hot melt adhesive composition comprising the same has excellent fluidity in heating and has a small heating loss and a small change in a hue in heating and has excellent heat stability.

Abstract: The present invention involves a hydrogenated copolymer obtained by hydrogenating a copolymer having a softening point falling in a range of 45 to 55° C. determined by a ball & ring method, wherein the hydrogenated copolymer has a softening point of 85 to 95° C. determined by the ball & ring method, and a hot melt adhesive composition comprising this copolymer hydrogenated product. The hydrogenated copolymer of the present invention has a small weight reduction rate in heating and a good hue after heating. The hot melt adhesive composition comprising the same has excellent fluidity in heating and has a small heating loss and a small change in a hue in heating and has excellent heat stability.

Abstract: A propylene polymer can be produced which has evenness of composition and regulated stereoregularity and is highly flowable and highly flexible. Also provided is propylene-based modifier giving a molding which is soft, reduced in tackiness, and excellent in compatibility with polyolefin resins. Furthermore, provided is a hot-melt adhesive composition. It is excellent in heat resistance and flowability at high temperature and in adhesion to lowly polar substance. It is usable for sanitary materials, packing, bookbinding, fibers, woodworking, electric materials, canmaking, building, bagmaking, etc.

Abstract: A drilling method and a drilling apparatus of a hard brittle material in which a core drill is used for abrasive grinding of high accuracy and high durability.