Abstract: A heat-sensitive recording material is prepared by forming a heat-sensitive recording layer on a synthetic paper having a laminated structure. The synthetic paper has a front surface having a smoothness (in accordance with JIS P-8119) of not less than 2000 seconds on which the heat-sensitive recording layer is provided, and a back surface having a smoothness of not more than 1000 seconds, and has an opacity (in accordance with JIS P-8138) of not higher than 40%. The heat-sensitive recording material is superior in recording runnability and recording quality, and gives recorded materials useful as a second original for diazo print.

Abstract: A heat-sensitive recording material having a uniform protective layer on a heat-sensitive recording layer formed on a base sheet which is a plastic film or synthetic paper can be obtained without generating a bar-line, streak or scratch. The protective layer is formed on the heat-sensitive recording layer after adjusting Bekk smoothness (measured by TAPPI standard T479 om-81) of the heat-sensitive recording layer to 500.about.6,000 seconds, preferably 1,500.about.4,500 seconds.

Abstract: A heat-sensitive recording material comprising a support and a recording layer provided on the support, said recording layer containing a colorless or pale-colored basic dye and a color developer capable of forming a color upon application of heat, wherein a smectite clay or a combination of a synthetic hectorite clay and soap-free emulsion type binder is incorporated in at least one of layers constituting the recording material.

Abstract: A process for producing a powder of microcapsules characterized by adding an aldehyde resin precondensate to a microcapsule dispersion prepared in water or a hydrophilic medium with use of a water-soluble high molecular compound as an emulsifier, maintaining the resulting mixture in a condition for promoting polycondensation of the precondensate, and removing the dispersing medium from the reaction mixture, and a process for producing a powder of microcapsules characterized by emulsifying a hydrophobic core material containing a specific oil-soluble melamine-formaldehyde resin precondensate in water or a hydrophilic medium, subjecting the emulsion to a condition for promoting polycondensation to form capsule wall films and obtain a microcapsule dispersion, and thereafter removing the dispersing medium from the dispersion are disclosed.Further, processes for producing a non-aqueous microcapsule composition are also disclosed.

Abstract: In a recording material producing images due to a complex formed from an organic phosphorus-iron compound having a bond of PO.sup.- and/or PS.sup.- with Fe.sup.3+ in the molecule and a ligand compound which reacts with the organic phosphorus-iron compound, the present recording material is characterized in that (a) a colorless or light-colored oil-soluble and/or heat-fusible organic compound adheres to the surface of the organic phosphorus-iron compound and/or (b) an organic base is present out of contact with the organic phosphorus-iron compound. The present invention also provides a desensitizer comprising at least one compound selected from the group consisting of (a) organic phosphorus compounds having a bond of P--OH and/or P--SH, (b) organic compounds having an aminocarboxyl group and (c) salts of these compounds (a) and (b).

Abstract: In a microencapsulation process which causes hydrophobic core material containing an oil-soluble melamine-formaldehyde precondensate to emulsified in water or in a hydrophilic medium, and to form capsule wall film under conditions for promoting polycondensation, the process which is characterized in that said oil-soluble melamine-formaldehyde precondensate is 40 to 100% in a degree of formaldehyde substitution, 80 to 100% in alkylation degree, and 4 to 11 in hydrophobic degree.