Abstract: A microchannel chip with which channel deformation does not occur even when high-temperature and high-pressure sterilization treatment is performed and with which strong joining performance of substrates is maintained; and a method for manufacturing the same are provided. A microchannel chip comprising: a channel substrate having a microchannel formed on at least one surface thereof; a lid substrate; and a joining layer joining the channel substrate and the lid substrate, wherein the channel substrate, the lid substrate, and the joining layer are each formed of a cycloolefin polymer, a glass-transition temperature Tgs1 of a cycloolefin polymer forming the channel substrate, a glass-transition temperature Tgs2 of a cycloolefin polymer forming the lid substrate, and a glass-transition temperature Tg2 of a cycloolefin polymer forming the joining layer have relationships: Tgs1>Tg2; and Tgs2>Tg2, and the joining layer has a thickness within a specific range.

Abstract: A phase difference film composed of a resin C containing a copolymer P including a polymerization unit A and a polymerization unit B, the phase difference film including a lamellar phase separation structure that generates a structural birefringence, the phase separation structure including a phase (A) having the polymerization unit A as a main component and a phase (B) having the polymerization unit B as a main component, and the phase difference film satisfying the formulae (1A): f(A)>0.5 and (2):D(A)>D(B), or the formulae (1B): f(B)>0.5 and (2). f(A) represents a total weight ratio of the polymerization unit A in the copolymer P, f(B) represents a total weight ratio of the polymerization unit B in the copolymer P, D(A)=ReA(450)/ReA(550), D(B)=ReB(450)/ReB(550), and ReA(450), ReA(550), ReB(450) and ReB(550) are as defined in the description.

Abstract: A phase difference film composed of a resin containing a copolymer including polymerization units A and B, the phase difference film including a cylindrical phase separation structure that generates a structural birefringence, the phase separation structure including a phase (A) having the polymerization unit A as a main component and a phase (B) having the polymerization unit B as a main component, and the phase difference film satisfying the following condition (1) or (2). Condition (1): D(A)>D(B) and f(B)>0.5, and a direction giving a maximum refractive index among in-plane directions and an orientation direction of a cylinder in the phase separation structure are parallel to each other. Condition (2): D(A)>D(B) and f(A)>0.5, and a direction giving a maximum refractive index among in-plane directions and an orientation direction of a cylinder in the phase separation structure are orthogonal to each other.

Abstract: An optical polymer satisfying an expression: (?A??B)/?B×100<60, where, ?A is the melt viscosity of the optical polymer measured at a temperature of 290° C. and a shear rate of 200 (l/s), and ?B is the melt viscosity of the optical polymer measured at a temperature of 290° C. and a shear rate of 2000 (l/s).

Abstract: An optical polymer satisfying an expression: (?A??B)/?B×100<60, where, ?A is the melt viscosity of the optical polymer measured at a temperature of 290° C. and a shear rate of 200 (l/s), and ?B is the melt viscosity of the optical polymer measured at a temperature of 290° C. and a shear rate of 2000 (l/s).

Abstract: A light reflection sheet (1) composed of a laminate comprising a white pigment contained layer 8 having projections having an average height of 0.1 to 5 &mgr;m on the layer surface and a polymer layer 9 stacked on the projection 7 side surface of the white pigment contained layer 8 is provided. According to the present invention, it is possible to provide a light reflection sheet composed of a laminate, having no luminance unevenness, being hard to cause a white spot phenomenon and not causing Moire fringes due to sticking.