Abstract: A method, apparatus and kit for assaying the L- and D-optical isomers and optionally the oxidation product derived from a L- (or D-) optical isomer.

Abstract: A pressure sensitive recording material utilizing a color forming reaction between a colorless or light-colored basic dye and a color acceptor, and in which (1) a basic dye-containing layer and color acceptor-containing layer are formed on one surface of different substrates respectively, (2) a basic dye-containing layer and color acceptor-containing layer are formed on one surface and the other surface of a same substrate respectively, (3) a basic dye-containing layer and color acceptor-containing layer are superposed on one surface of a substrate or (4) a layer containing both basic dye and color acceptor is formed on one surface of a substrate, the pressure sensitive recording material being characterized in that the basic dye is at least one diarylmethane compound represented by the formula (1) given below, the basic dye being enclosed in synthetic high polymer microcapsules having a mean particle size of 3 to 15 .mu.m and an average film thickness of 0.1 to 0.7 .mu.

Abstract: The present invention provides a heat sensitive recording material comprising a substrate, a recording layer formed over the substrate and containing a colorless or light-colored basic dye and a color acceptor, and a protective layer formed over the recording layer, the recording material being characterized in that microcapsules having an ultraviolet absorber enclosed therein and having substantially no color forming ability are incorporated in the protective layer.Further, the present invention provides microcapsules having an ultraviolet absorber and as required an organic solvent enclosed therein, which have capsule wall film of synthetic resin and mean particle size of 0.1 to 3 .mu.m.

Abstract: The heat-sensitive recording material has on a base sheet a heat-sensitive recording layer which comprises a colorless or pale colored basic chromogenic material and a color developer. The recording layer comprises at least one fluoran derivative developing a black color and at least one azaphthalide derivative represented by the formula (I) as the basic chromogenic material, and at least one diphenylsulfone derivative represented by the formula (II) as the color developer. The azaphthalide derivative is used in an amount of 3 to 50 % by weight based on the amount of the fluoran derivative.

Abstract: Herein disclosed is a method for preparing a nuclear-substituted salicylic acid or a metal salt thereof represented by the following general formula (1): ##STR1## [wherein R.sub.1 and R.sub.2 each represents a t-butyl group, a t-amyl group, a t-octyl group, an isononyl group or an isododecyl group, provided that at least one of R.sub.1 and R.sub.2 represents an isononyl group or an isododecyl group; M represents a hydrogen atom or a metal atom; and n is the atomic valency of the metal atom M] which comprises the step of subjecting, to a Kolbe-Schmitt reaction, an alkali metal salt of a nuclear-substituted phenol represented by the following general formula (2): ##STR2## [wherein R.sub.1 and R.sub.2 are the same as those defined above] in which 100 to 50% of the alkali metal salt is potassium salt and 0 to 50% thereof is sodium salt, in a substantially water-insoluble solvent as a reaction medium.

Abstract: The present invention provides a recording material utilizing a reaction between a colorless or light-colored dye precursor and a color developer capable of forming a color upon coming into contact with the dye precursor, the recording material being characterized in that the material comprises at least one compound serving as the dye precursor and represented by the formula (1), and an acidic substance serving as the color developer ##STR1## wherein R.sub.1 to R.sub.6, p and q are defined in the specification. At least one selected from the group consisting of phenolic compounds of the formulae (10), (11) and (12) and phenolic resin having a partial structure of the formula (13) can be used, as required, to further improve the color forming properties and change the color of recorded images from reddish purple or purple to blue or dark blue.

Abstract: An image-receiving sheet for thermal transfer printing comprising a substrate and an image-receiving layer disposed on said substrate, characterized in that said image-receiving layer contains thermoplastic resin fine particle aggregates. And an image-receiving sheet comprising a substrate, an intermediate layer disposed on said substrate, and an image-receiving layer disposed on said intermediate layer, characterized in that at least said intermediate layer contains thermoplastic resin fine particle aggregates.

Abstract: The present invention provides a color developer composition characterized in that the composition contains a color developer comprising as its main component a nucleus-substituted salicylic acid salt represented by the formula (1) given below, and at least one amide compound selected from the group consisting of the compounds of represented by the formula (2) and formula (3) given below. ##STR1## wherein R.sub.1 to R.sub.10 are as defined in the specification.

Abstract: In a two-substrate measuring apparatus employing a first enzyme electrode for responding only to a first substrate to be measured and a second enzyme electrode for responding to both first and second substrates to be measured, in which the same enzymatic reactions are used for forming detectable substances and the substances to be finally detected by the electrodes are identical, when calculating the calibration curve for the second substrate to be measured, the output portion due to traces of the first substrate contained in the second substrate to be measured is removed, so that the second substrate is measured at a high sensitivity and high accuracy.

Abstract: The present invention relates to a simple and yet multifunctional system for assay employing immobilized enzymes.

Abstract: The invention provides a heat-sensitive recording medium comprising (a) a support and (b) a heat-sensitive recording layer formed on the support and comprising a colorless or pale-colored basic dye and a color developing material capable of causing color development upon contact with the dye by heating, which medium is characterized in that the heat-sensitive recording layer contains at least one phosphate compound selected from the group consisting of 2,2'-methylenebis(4,6-di-tert-butylphenyl) phosphate of the general formula (1) shown below and alkali metal, ammonium and polyvalent metal salts thereof: ##STR1## wherein R represents a tert-butyl group.

Abstract: A method of measuring and expressing the unwound amount or residual amount of a web roll, such as carbon film roll or printing paper roll in terms of a unit length of the web roll includes the steps of: starting a count of pulses to be produced by a rotation displacement detecting sensor for each predetermined angle of rotational displacement when the residual amount of the web roll is considered to have been reduced to a predetermined value; and emitting a warning signal when the count reaches a predetermined count number (initially set on the basis of the average value of the amounts of unwinding rotation of the web roll per unit length) during the time when the web roll is unwound and fed by a unit length from the count start time.

Abstract: A paper feeding device for a printer comprising a paper feed box for containing a paper roll. The device includes a bottom slanting to the front and a front wall defining the lower edge of a drawing outlet for unrolled paper portions of the roll. The paper roll freely contacts both of the bottom and the front wall. The paper feed box may be supported by a spring at the undersurface of the feed box capable of rising and falling. Slip guide means may be provided at a predetermined position above the paper feed box so that when the paper roll is placed in the paper feed box, the upper end of the paper roll is pressed to the guide means and unrolled paper is drawn from the roll around the guide means.

Abstract: An image-receiving sheet for thermal dye-transfer recording comprising a substrate and an image-receiving layer disposed on said substrate, said image-receiving layer being capable of receiving an image to be transferred from a coloring material-transferring sheet, characterized in that said image-receiving layer is formed of a coating composition comprising an aqueous solution or a water dispersion of a resin having a dyeing property, a carboxy-modified silicone compound, and a multi-functional aziridine derivative.

Abstract: The present invention provides a heat sensitive recording material comprising a heat sensitive recording layer formed on a substrate and containing a color former and a color developer reactive with the color former, an intermediate layer formed on the recording layer and containing a water-soluble resin or water-dispersible resin, and an overcoat layer formed on the intermediate layer and containing a resin curable with an ionizing radiation, the heat sensitive recording material being characterized in that the color developer comprises at least one of a salicylic acid derivative represented by the following formula (1) or formula (2) and polyvalent metal salt of the derivative ##STR1## wherein Ar, Q, A, R, X, Y, m and n are defined in the specification.

Abstract: The present invention provides a heat sensitive recording material comprising a substrate, a recording layer formed over the substrate and containing a colorless or light-colored basic dye and a color acceptor, and a protective layer formed over the recording layer, the recording material being characterized in that microcapsules having an ultraviolet absorber enclosed therein and having substantially no color forming ability are incorporated in the protective layer.Further, the present invention provides microcapsules having an ultraviolet absorber and as required an organic solvent enclosed therein, which have capsule wall film of synthetic resin and mean particle size of 0.1 to 3 .mu.m.

Abstract: An image-receiving sheet for thermal transfer printing comprising a substrate, an intermediate layer and an image-receiving layer, said intermediate layer and said image-receiving layer being disposed in this order on said substrate, characterized in that said intermediate layer comprises a layer containing (a) fine particles of one or more kinds of resins selected from the group consisting of thermosetting resins and other resins having a softening point of higher than 150.degree. C. and (b) fine particles of a polyolefin resin as the main constituents and the amount of said fine particles (a) contained in the intermediate layer is in the range of from 5 to 90% by weight.The image-receiving sheet excells in the whiteness and opacity and exhibits an excellent recording sensitivity. The image-receiving sheet provides high quality images accompanied with no missing dot when used in a thermal transfer printing system wherein a thermally sublimable dye is utilized.

Abstract: The present invention provides a color developer composition characterized in that the composition contains a color developer comprising as its main component a nucleus-substituted salicylic acid salt represented by the formula (1) given below, and at least one amide compound selected from the group consisting of the compounds of represented by the formula (2) and formula (3) given below. ##STR1## wherein R.sub.1 to R.sub.10 are as defined in the specification.

Abstract: An improved pressure sensitive recording sheet capable of causing an improved color development which comprises a substrate and a layer containing microcapsules each containing an electron-donative chromogenic material and a hydrophobic medium containing benzyl toluene being formed on the substrate.The pressure sensitive recording sheet exhibits an excellent color-developing property and provides clear color images of high density.

Abstract: A heat-sensitive recording material comprising a substrate and a heat-sensitive recording layer disposed on said substrate, said heat-sensitive recording layer containing a colorless or light-colored basic dye and a color developer capable of causing color development upon contact with said basic dye by application of heat, characterized in that said heat-sensitive recording layer contains (i) an antioxidant comprising at least a member selected from the group consisting of the compounds represented by the following structural formula (I) and the compounds represented by the following structural formula (II), (ii) an aromatic secondary amine compound and (iii) at least a basic dye having an absorption in the near infrared region with respect to an image provided as said basic dye.