Abstract: An object of the present invention is to provide a novel phenolic compound, and a recording material containing the same, which is excellent in storage stability. The object can be achieved by a phenolic compound represented by the formula (I): [wherein m represents an integer of 0 to 2; R1 and R2 each independently represents a C1–C6 alkyl group or a C1–C6 alkoxy group; p and q each independently represents an integer of 0 to 4; t and u each independently represents 0 or 1 and do not simultaneously represent 0; and X represents a group represented by any of the formulas (II) to (VII): (wherein R3, R4, R5, R6, R7, R8, R9, R10 and R11 each independently represents a hydrogen atom or a C1–C6 alkyl group; a represents an integer of 1 to 6; b represents an integer of 0 to 4; and c represents an integer of 0 to 6)] and a recording material containing the same.

Abstract: Phenolic compounds of general formula (I); and recording materials characterized by containing one of them and exhibiting high light stability wherein R1 and R2 are each hydrogen or C1-C6 alkyl; m is an integer of 1 to 6; n is an integer of 0 to 2; p and t are each an integer of 0 to 3 with the proviso that not both are simultaneously 0; R3 and R4 are each nitro, carboxyl, halogeno, C1-C6 alkyl, or the like; q and u are each an integer of 0 to 2 with the proviso that when q or u is 2, R3s or R4s may be different from each other; and Y is CO or NR5CO (wherein R5 is hydrogen or the like), with the proviso that when Y is CO, p is 1 and that when p is 0 and Y is NR5CO, n is not 0.

Abstract: The present invention provides a composition and a recording material made from the composition having an excellent dynamic sensitivity in recording as well as an excellent image stability and, particularly, having excellent resistance for heat and humidity, heat, light, plasticizer and water. The composition and the recording material include the following compounds (1), (2), and (3): wherein R1, R2, R6, R7, R11, and R12 each represents hydrogen or an alkyl group; a1 to a3 each represents an integer of 1-6; n1 to n3 each represents 0, 1 or 2; m1, m4 and m7 each represents 0, 1, 2 or 3; R3, R4, R8, R9, R13 and R14 each represents an alkyl group; m2, m3, m5, m6, m8 and m9 each represents 0, 1 or 2; and Y1 to Y3 each represents CO or NRCO (R represents hydrogen, etc.).

Abstract: An object of the present invention is to provide a novel phenolic compound, and a recording material containing the same, which is excellent in storage stability. The object can be achieved by a phenolic compound represented by the formula (I): [wherein m represents an integer of 0 to 2; R1 and R2 each independently represents a C1-C6 alkyl group or a C1-C6 alkoxy group; p and q each independently represents an integer of 0 to 4; t and u each independently represents 0 or 1 and do not simultaneously represent 0; and X represents a group represented by any of the formulas (II) to (VII): (wherein R3, R4, R5, R6, R7, R8, R9, R10 and R11 each independently represents a hydrogen atom or a C1-C6 alkyl group; a represents an integer of 1 to 6; b represents an integer of 0 to 4; and c represents an integer of 0 to 6)] and a recording material containing the same.

Abstract: A recording material and a recording sheet free from surface fogging and excellent in dynamic coloring sensitivity, wet heat resistance, heat resistance, light resistance, plasticizer resistance, and water resistance. A recording material comprising a composition containing at least one kind of a compound (1) and at least one kind of a compound (2) and/or at least one kind of a compound (3), and a recording sheet having a recording layer formed from the recording material. Compound (1), Compound (2), Compound (3) (in the formulae, R1, R2, R6, R7, R11, R12 indicate hydrogen atom or alkyl radical, a1-a3 integer of 1-6, n1-n3 0, 1 or 2, m1, m4 and m7 0, 1, 2, or 3. R3, R4, R8, R9, R13, R14 indicate alkyl radical or the like, m2, m3, m5, m6, m8, and m9 0, 1 or 2, Y1-Y3 Co or NRCO (R indicates hydrogen atom or the like)).

Abstract: A symmetrical type four-component lens system comprises, in the direction of incidence of light, a first lens component, a second lens component, a stop, a third lens component and a fourth lens component. Each lens component is a combination of a positive and a negative lens element, the concave surface of each element facing the stop. The surfaces of the first and fourth components facing the stop have shorter radii of curvature than the surfaces of the second and third components facing away from the stop. The first and fourth components have greater focal lengths than the second and third components. The second and third components satisfy certain conditions relating to the materials forming them.