Abstract: An optical element includes a first transparent member, a second transparent member disposed in contact with the first transparent member and having a different linear expansion coefficient from the first transparent member, and a bonding member configured to bond the first transparent member and the second transparent member to each other. An elastic modulus of the bonding member is 1700 MPa or less at a temperature of ?30° C.

Abstract: An electrophotographic belt includes a base layer containing a binder resin and carbon black in the binder resin. The binder resin contains at least one resin selected from the group consisting of PEEK and PPS. A water content calculated by ((X2?X1)/X2)×100 is 0.6% where X1 is a mass of a specimen cut out of the base layer when in a nitrogen atmosphere a temperature of the specimen is increased from 30° C. to 100° C. at a rate of 20° C./min. and maintained at 100° C. for 30 min, and X2 is a mass of the specimen when in a nitrogen atmosphere the specimen is thereafter cooled from 100° C. to 30° C. at a rate of 20° C./min. and the specimen is left to stand in the air under an environment of a temperature of 23° C. and a relative humidity of 50% for 48 hours.

Abstract: An optical element includes a substrate having an optically effective surface and an optically non-effective surface, and a light shielding film disposed over the optically non-effective surface. The optically non-effective surface has an inclined chamfer and a level chamfer that define a ridge portion. The ridge portion is coated with an aliphatic hydrocarbon.

Abstract: An optical element includes a substrate having an optically effective surface and an optically non-effective surface, and a light shielding film disposed over the optically non-effective surface. The optically non-effective surface has an inclined chamfer and a level chamfer that define a ridge portion. The ridge portion is coated with an aliphatic hydrocarbon.

Abstract: A mixed material which includes a poly(methyl methacrylate) and inorganic fine particles which are surface-treated with a functional group having an amino group or a hexadecyl group or inorganic fine particles having hydrophilic surfaces and in which the content of the inorganic fine particles is 30 to 80 vol % is molded into an organic-inorganic composite molded product, and hence, a low coefficient of linear expansion in a range of 20 to 60 degrees Celsius, such as 20*10?6/degree Celsius or less, is realized.

Abstract: The present invention relates to a molded article exhibiting a low linear expansion coefficient and a method of producing the molded article. The molded article is molded from a resin composition containing at least a thermoplastic cyclic olefin resin and silica particles surface-modified with amino functional groups and having a number average particle diameter of primary particles of 10 nm or more and 50 nm or less. The resin composition contains the silica particles in an amount of 34% by mass or more and 85% by mass or less.

Abstract: The present invention relates to a molded article exhibiting a low linear expansion coefficient and a method of producing the molded article. The molded article is molded from a resin composition containing at least a thermoplastic cyclic olefin resin and silica particles surface-modified with amino functional groups and having a number average particle diameter of primary particles of 10 nm or more and 50 nm or less. The resin composition contains the silica particles in an amount of 34% by mass or more and 85% by mass or less.

Abstract: A mixed material which includes a poly(methyl methacrylate) and inorganic fine particles which are surface-treated with a functional group having an amino group or a hexadecyl group or inorganic fine particles having hydrophilic surfaces and in which the content of the inorganic fine particles is 30 to 80 vol % is molded into an organic-inorganic composite molded product, and hence, a low coefficient of linear expansion in a range of 20 to 60 degrees Celsius, such as 20*10?6/degree Celsius or less, is realized.

Abstract: An organic-inorganic composite molded product formed by molding a composite material of an organic resin and inorganic fine particles is provided, and in this molded product, the average primary particle diameter of the inorganic fine particles is 1 to 30 nm, the concentration of the inorganic fine particles is 25 to 50 percent by volume, and the porosity is 20 to 55 percent by volume. Accordingly, an organic-inorganic composite molded product having a small content of the inorganic fine particles and a significantly low average coefficient of linear expansion of 20*10?6 to ?110*10?6/degree Celsius can be manufactured.

Abstract: An optical material includes a silsesquioxane compound having a polymerizable functional site, and silica fine particles. The total content of the silsesquioxane compound and the silica fine particles in the optical material is 95 percent by weight or more, and the average particle diameter of the silica fine particles is 1 nm or more and 100 nm or less.