Abstract: [Problem to be Solved] To provide an acetylene compound having a structure in which a unit having an amino group and a unit having an ethynyl group are bonded via a linking group, the acetylene compound being introducable to a polymer having thermal resistance. [Means for Solving the Problem] An acetylene compound represented by the following Formula (1) and a salt thereof: wherein in Formula (1), X represents a single bond or a divalent linking group; A represents a hydrocarbon group, a heteroaromatic ring or a heteroalicyclic compound; B represents a hydrocarbon group, a heteroaromatic ring, a heteroalicyclic compound or a single bond; R1 represents a hydrogen atom, a hydrocarbon group, a heteroaromatic ring, a heteroalicyclic compound or a silyl group; R4 represents a hydrogen atom or a group that can be a substituent of an amino group; and m, n and a each independently represent an integer of 1 or greater.

Abstract: The invention provides an acetylene compound represented by the following Formula (1), which is useful as a raw material for a polymer achieving high thermal resistance; wherein, in Formula (1), the encircled Ar represents an aryl group or a heteroaryl group; X represents a divalent linking group; R, R? and R1 each independently represent a hydrogen atom, a hydrocarbon group or a heterocyclic group; R2 represents a hydrogen atom or a substituent substitutable on a benzene ring; A represents a hydrocarbon group or a heterocyclic group; Q represents a hydrogen atom, a hydrocarbon group, or a metal element capable of forming a monovalent metal salt; a represents an integer from 0 or more; b, m and n each independently represent an integer of 1 or more; when n, m and b are 1 at the same time, X is not —(C?O)O—; and when n is 2, and both m and b are 1, X is not —O—.

Abstract: A substrate for liquid crystal display device comprising a layer having irregular differences in level and a smoothing layer provided directly on the layer having irregular differences in level, wherein the thickness of the smoothing layer is greater than the irregular differences in level, and the in-plane retardation of the layer inclined of 40° with the retardation axis as the axis of rotation is 5 to 150 nm, which enables to reduce the number of steps in manufacturing, is provided by the present invention.

Abstract: A carbonic acid ester is provided that is represented by the formula below and has a melting point of no greater than 0° C. (In the formula, R1 and R2 independently denote a saturated hydrocarbon group, R1 is a branched chain, and R2 is a straight or branched chain). There is also provided a magnetic recording medium that includes a non-magnetic support and, above the support, at least one magnetic layer including a ferromagnetic powder dispersed in a binder, the magnetic layer including the carbonic acid ester. Furthermore, there is provided a magnetic recording medium including a support and, above the support, a non-magnetic layer including a non-magnetic powder dispersed in a binder, and above the non-magnetic layer, at least one magnetic layer including a ferromagnetic powder dispersed in a binder, the non-magnetic layer and/or the magnetic layer including the carbonic acid ester.