Abstract: A reversible thermal recording medium having a core material capable of being change in state by heat and a recording layer including capsules containing this core material. A repeatability corresponding to the limit of possible repeated recording/erasing effected by a physical or chemical change in the material constituting the recording can be obtained. A deterioration in image quality caused by transfer of a part of the recording layer to the heating unit can be prevented and repeat characteristics can be improved, thereby limiting the running cost.

Abstract: Novel microcapsules are characterized in that their walls are made of reaction products of guanidine compounds and polyisocyanates or contain such reaction products. Dispersions containing such microcapsules can be prepared by replacing the amines, amino alcohols or hydrazine compounds in processes known per se for preparing microcapsule dispersions from polyisocyanates and amines, amino alcohols or hydrazine compounds by guanidine compounds. The present invention also relates to no-carbon copy papers containing dyestuff precursors in microcapsules whose walls are made of reaction products of guanidine compounds and polyisocyanates or contain such reaction products.

Abstract: An image transfer sheet comprises a base sheet, an intermediate thermoplastic resin layer and a top developer layer containing a binder. The binder of the top layer and the thermoplastic resin of the intermediate layer include a polymer having a common monomer component so that separation of the top layer from the intermediate layer and splitting of the top layer are effectively prevented. This provides a clear, high quality image on an image receiving surface such as paper by transference of a developed image on the developer layer.

Abstract: Pressure-sensitive copying material comprises 3,1 benzoxazine chromogenic material(s) in a solvent comprising vegetable oil and/or a mono-, di or tri-functional ester of a non-aromatic mono-carboxylic acid having a straight or branched hydrocarbon chain with at least three carbon atoms in the chain in addition to the carboxyl carbon atom and an inorganic colour developer. The surface pH of the colour developer is not more than about 8.7, which gives rise to enhanced image intensity and fade resistance compared with the use of 3,1 benzoxazine chromogenic materials in the same solvent with the same colour developer at higher surface pH values.

Abstract: A pressure and heat-sensitive composition comprising chromogen-containing pressure-rupturable microcapsules and heat-sensitive color developer useful for verification of document authenticity system when applied as a localized coating on documents, such as checks and prescriptions. Quickly striking the chromogenic composition with a fingernail or blunt object to generate pressure and heat in the coating produces a colored image by friction. The chromogenic composition possesses a fugitive characteristic, whereby the colored image gradually disappears and can be made to reappear when the chromogenic coating is again subjected to external pressure and heat. This feature can be used for repeated verification of the authenticity of the document.

Abstract: A reversible thermosensitive coloring recording method for producing multi-color images by use of a reversible thermosensitive coloring recording medium which is composed of a support and a reversible thermosensitive coloring recording layer containing a plurality of reversible thermosensitive coloring compositions, each coloring composition being independently present separated from the other coloring compositions, and capable of reversibly forming a color development state with a different color in a predetermined color development temperature range, and a decolorization state in a predetermined decolorization temperature range by the application of heat thereto and maintaining the above two states at room temperature, the decolorization temperature range being located lower in terms of temperature than the color development temperature range therefor, comprises the steps of: temporarily applying heat to the recording medium to a color development temperature at which at least two of the coloring compositio

Abstract: This invention provides a pressure- and heat-sensitive multilayer copying paper useful as a recording material for various types of recording machines, such as a portable terminal. A pressure- and heat-sensitive multilayer copying paper comprises: an upper paper member composed of: a substrate sheet; a layer provided on a front surface of the substrate sheet comprising a organic compound and an acidic organic compound; a layer provided on a back surface of the substrate sheet comprising a organic compound, microcapsules encapsulating the organic compound and a thermomeltable material; and an overcoated protective layer placed on the layer provided on a back surface of the substrate sheet; and a lower paper member: a substrate sheet; a layer provided on a front surface of the substrate sheet comprising at least one acidic organic compound which forms color in case that it reacts with the organic compound.

Abstract: Particularly advantageous and environmentally compatible recording material comprises, in microencapsulated form, at least one 3,1-benzoxazine color donor dissolved in a solvent, and is characterized in that the solvent consists of one or more natural oils and/or one or more esters of fatty acids on which natural oils are based, or comprises such oils and/or esters.

Abstract: A photosensitive microcapsule which contains a polymerizable monomer and a polymerization initiator has increased sensitivity due to the displacement of soluble water in the monomer photosensitive microcapsule comprises a polymerizable monomer contained in a microcapsule; a photopolymerization initiator comprising a hydrophobic sensitizer for initiating polymerization of the polymerizable monomer in response to incident light energy; and an image producing material such as a dye or a precursor; wherein the hydrophobic sensitizer includes at least one of 3,7-bis (octadecylmethylamino) phenothiazoniumchloride which reacts on a red color light energy, 3,7-di(octadecylmethylamino)-5-phenylphenaziniumchloride which reacts on a green color light energy, and 3,6-di(octadecylmethylamino)-acridinechloride which reacts on a blue color light energy.

Abstract: The invention provides a novel micro-capsule toner, having a constitution and features absolutely differing the conventional counterpart, that has fully solved the conventional problem that the pattern may vanish. The toner is a novel thermal micro-capsule toner in which the micro-capsule is composed of two or more types of compositions, and in which a component that will be thermally decomposed to generate a gas has been added to the cell or core of the micro-capsule of the compositions, or to the interface between the cell and the core. The toner is added to a paint or an adhesive, or applied onto a carrier, or added to a moldable resin. By directly or indirectly heating, the toner allows a nonvolatile pattern to be developed. The micro-capsule will rupture by simple heating so that a nonvolatile patter is obtained. It becomes possible to print characters and images on various materials such as paper, synthetic resins, woods, and metals.

Abstract: This invention provides the following production process.A microencapsulation process comprising encapsulating a hydrophobic core material with a melamine-formaldehyde polycondensate resin in the presence of an anionic macromolecular electrolyte system, characterized in that, as said anionic macromolecular electrolyte system,(A) vinyltoluenesulfonic acid-maleic anhydride copolymer and(B) methyl vinyl ether-maleic anhydride copolymer are used in a weight ratio A:B of 50:50.about.90:10.

Abstract: A heat-sensitive recording material comprising on a support a heat-sensitive layer comprising color-forming component A, color-forming component B which forms a color by reacting with the color-forming component A, and a tricarbocyanine dye having at least two acidic groups, wherein the tricarbocyanine dye has an absorption maximum wavelength of 650 to 1300 nm in the heat-sensitive layer and has an absorption maximum wavelength 50 nm or more longer than that of an aqueous solution of the tricarbocyanine dye.

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: Pressure-sensitive copying material utilizes a blend of rapid- and slow-developing chromogenic materials in vegetable oil solvent and an acid clay or synthetic inorganic color developer. The surface pH of the color developer is not more than 8.7, which gives rise to enhanced image intensity and fade resistance compared with the use of conventional higher color developer surface pH values.

Abstract: A pressure-sensitive recording sheet, comprising: a synthetic resin support sheet; a color developer layer coated on one face of the support sheet; a color former layer overcoated on the color developer layer and containing a microcapsulated color former; a first water-impermeable layer adhering on the other face of the support sheet through an adhesive; and a transparent second water-impermeable layer covering directly over the color former layer; and wherein the outer peripheries of the first and second water-impermeable layers are liquid-tightly closed to protect the support sheet, the color developer layer and the color former layer from attack by any aqueous liquid. The pressure-sensitive recording sheet or the support sheet is shaped to have a horseshoe-like contour to be used as an occlusion pressure detecting sheet. A wax coating layer may be provided on at least one surface of the occlusion pressure detecting sheet to record the dental arch pattern.

Abstract: A remarkably low odor carbonless paper solvent is provided comprising a mixture of diisopropylbiphenyl and triisopropylbiphenyl, generally in an amount of 50 to 90% by weight diisopropylbiphenyl and 10 to 40% by weight triisopropylbiphenyl. The solvent and a chromogenic substance such as a leuco dye are encapsulated to form microcapsules which are coated onto one surface of a carrier sheet. A color developing substance is then applied to another sheet to form a carbonless marking system. When the microcapsules are ruptured, the solubilized chromogenic substance contacts and reacts with the developer to form an image.

Abstract: A novel imaging process is disclosed comprising preparing microcapsules having an elongation of less than 1%, adhering the microcapsules to a substrate then imagewise rupturing certain of said microcapsules upon selective application of a thermal energy input comprising a .DELTA.T of at least 115.degree. C. per 1 millisecond. The process makes use of novel microcapsules polymerized at a temperature of from 65.degree. C. to 100.degree. C. which are heat resistant yet heat fracturable upon application of a thermal pulse.

Abstract: This invention relates to improved imaging systems based on the formation of yellow colored coordination compounds of transition metals with certain ligands. These coordination compounds have been found to provide excellent yellow colors when used in pressure sensitive carbonless copy-papers wherein the image is formed by the reaction of a color-forming compound with transition metal salts such as those of nickel, cobalt, iron, copper, and similar materials. These yellow color-formers have the advantage of high solubility in encapsulation solvents and have less color on Zn.sup.2+ containing CB sheets. Use of these yellow color-formers with other metal complex color-formers such as N-(monosubstituted)dithiooxamide color-formers and N,N'-(disubstituted)dithiooxamides results in the formation of black images.

Abstract: The photochromatic indicator is a dry film comprised of microencapsulated chemistry which reacts to the degradation of the dry film components when irradiated by UVA and UVB in the frequency spectral range of 290 nm (low end of the UVB spectrum) to 365 nm (high end of the UVA spectrum). This degradation produces free hydrogen and chorine radicals which combine to form acidic byproducts of hydrogen chloride gas or hydrochloric acid.The initial microencapsulation has an interior molecular grouping of acid sensitive dye and UVA and UVB absorbing chemistry surrounded by, and bonded to, a chlorinated rubber compound. This interior is then also microencapsulated by bonding a coating of polyvinylchloride (pvc) to the chlorinated rubber by using epoxide agents which, in turn, retard the degradation of both the pvc and the chlorinated rubber.By varying the amount of epoxides in the bonding phase, the time for the dye to complete its full color change can be adjusted.

Abstract: The present invention is characterized by using an ampholytic latex as binder in a carbonless copying paper prepared by coating on a support a coating composition comprising a stilt agent, a binder and anionic microcapsules containing a color former and drying the composition. The present invention is further characterized by using an association forming polymer in a coating composition in a carbonless copying paper prepared by coating on a support a coating composition containing a stilt agent, a binder mainly composed of a latex and microcapsules containing a color former and drying the coating composition. The present invention is further characterized by using an association forming polymer in a coating composition without using a stilt agent in a carbonless pressure-sensitive copying paper prepared by coating a coating composition comprising a latex and microcapsules containing a color former and drying the composition.

Abstract: An oily liquid and an aqueous liquid as prepared at a temperature of 80.degree. C. are continuously emulsified at a temperature of 50.degree. C. or higher to give an emulsion, then a liquid comprising a polyamine and a concentration adjusting water of 50.degree. C. or higher is added to the emulsion and mixed in a static mixer, the emulsion mix is continuously flown into an encapsulation device from the bottom to the top thereof, and microcapsules are obtained by overflowing after a retention time of 60 minutes on average.

Abstract: A process for making melamine-formaldehyde microcapsules in an aqueous solution containing a high concentration of a water miscible or water soluble organic solvent is provided. The aqueous solution is prepared and a water insoluble melamine-formaldehyde pre-condensate is dissolved therein by adjusting the temperature and organic solvent concentration of the aqueous solution such that the melamine-formaldehyde pre-condensate is barely soluble therein. A substance to be encapsulated, preferably an oily solution containing a dyestuff precursor, is dispersed into the aqueous solution to form an emulsion, the melamine-formaldehyde pre-condensate being insoluble in the substance to be encapsulated.

Abstract: A production method of microcapsules using a copolymer including at least three types of monomers including 50 to 90 by weight of acrylic acid, 2 to 40% by weight of an acrylamidealkylsulfonic acid such as acrylamidepropanesulfonic acid, and 2 to 15% by weight of an alkylacrylate such as butylacrylate as an anionic water-soluble polymer as an emulsifier and a reaction promoter for a core substance of the microcapsules, whereby obtaining microcapsules for use in pressure-sensitive copy paper having wall films of an amine-aldehyde condensation polymer which reduces spot staining generated when the capsules are used in pressure-sensitive copy paper by reducing coarse particles present in traces in the microcapsule slurry.

Abstract: A method for visibly marking an area contaminated with transformer oil or other organic liquid uses a marking composition that consists of a colorant held within a solid carrier material, the colorant being such as to effect a visibly perceptible change upon contact with the organic liquid. The carrier material may be an absorbent that permits delivery of the colorant through capillary action, or the colorant may be encapsulated by a cell-forming matrix material that interacts with the contaminating liquid to effect release.

Abstract: Recording materials which contain one or more optionally polymer-enrobed dye precursors, one or more optionally polymer-enrobed developers and one or more polymer-enrobed sensitizers are described.

Abstract: Microcapsules can be prepared in an energy-saving manner by using a polyisocyanate which consists exclusively or partially of reaction products of isocyanates having a functionality of 2 or more with polyethylene oxide alcohols.

Abstract: A novel record material is disclosed comprising a substrate bearing microcapsules having nonmeltable walls. The microcapsules contain a chromogen or developer and a photosensitive composition internal thereof, said microcapsules undergoing a change in viscosity upon exposure to actinic radiation. The walls of the microcapsules have an elongation of not more than 1%, and the record material is resistant to heat, measured by not producing any substantial color when placed in a 150.degree. C. oven for one minute. Surprisingly, the record material however is capable of forming a color upon application to the record material of a point source energy input comprising a .DELTA.T of at least 115.degree. C. per one millisecond.

Abstract: A remarkably low odor carbonless paper solvent is provided comprising a mixture of diisopropylbiphenyl and triisopropylbiphenyl, generally in an amount of 50 to 90% by weight diisopropylbiphenyl and 10 to 40% by weight triisopropylbiphenyl. The solvent and a chromogenic substance such as a leuco dye are encapsulated to form microcapsules which are coated onto one surface of a carrier sheet. A color developing substance is then applied to another sheet to form a carbonless marking system. When the microcapsules are ruptured, the solubilized chromogenic substance contacts and reacts with the developer to form an image.

Abstract: A method of producing a photosensitive microcapsule which contains a polymerizable monomer and a polymerization initiator. Soluble water is displaced in the polymerizable monomer by performing one or both of distilling the polymerizable monomer and adding a dehydrating agent to the polymerizable monomer. The polymerization initiator and a first microcapsule-forming material are added to the water-displaced polymerizable monomer to produce a solution. Soluble oxygen in the polymerizable monomer is displaced by performing one or both of bubbling an inert gas and adding an oxygen absorbent to the polymerizable monomer. Soluble oxygen may also be displaced in an ionic surfactant by performing the bubbling and adding of oxygen absorbent. The ionic absorbent is added to the solution containing the polymerizable monomer and polymerization initiator, and then the solution is emulsified. A microcapsule membrane is produced by adding a second microcapsule-forming material to the emulsion.

Abstract: The present invention is characterized by using an ampholytic latex as binder in a carbonless copying paper prepared by coating on a support a coating composition comprising a stilt agent, a binder and anionic microcapsules containing a color former and drying the composition. The present invention is further characterized by using an association forming polymer in a coating composition in a carbonless copying paper prepared by coating on a support a coating composition containing a stilt agent, a binder mainly composed of a latex and microcapsules containing a color former and drying the coating composition. The present invention is further characterized by using an association forming polymer in a coating composition without using a stilt agent in a carbonless pressure-sensitive copying paper prepared by coating a coating composition comprising a latex and microcapsules containing a color former and drying the composition.

Abstract: This invention relates to improved imaging systems based on the formation of green-yellow colored coordination compounds of transition metals with certain ligands. The formation of colored coordination compounds can be employed to generate images and is important in the manufacture and use of pressure sensitive transfer papers for preparing carbonless copies. In particular, this invention relates to certain 2,5-bis(substituted aryl)thiazolo[5,4-d]thiazole compounds, and particularly to certain 2,5-bis(o-hydroxyaryl)thiazolo[5,4-d]thiazole compounds, to their coordination compounds with certain transition metals, and to their use in pressure sensitive carbonless copy paper systems. These compounds have been found to provide excellent green-yellow colors when used in pressure sensitive carbonless copy-papers wherein the image is formed by the reaction of a color-forming compound with transition metal salts such as those of nickel, cobalt, iron, copper, and similar materials.

Abstract: The upper surface of an upper sheet for a carbon copy system made of pressure-sensitive self-copying paper has a layer, designed to be printed on, made of pigment, binder and water-repelling agent, to increase the opacity and control the bonding properties for ease of sheet detachment.

Abstract: A process for forming microcapsules having discrete capsule walls comprising the steps of:forming an emulsion of an oily core material phase in a continuous aqueous phase, said oily core material phase including isocyanatoacrylate or cyanoacrylate prewall reactants which react with said aqueous phase to form a pre-wall material around said oily core material phase; andenwrapping particles of said oily core material phase in an amine-formaldehyde condensation product produced by in situ condensation of an amine and formaldehyde, and the microcapsules produced thereby are disclosed.

Abstract: A self-contained imaging sheet comprising in order:(a) a support;(b) a first layer comprising photosensitive microcapsules having an internal phase, said internal phase comprising an image forming agent and a photosensitive composition which undergoes a physical transformation in response to exposure to actinic radiation;(c) a second layer comprising a developer material; and preferably(d) a third layer comprising an adhesive forming component, said self-contained imaging sheet being useful in forming images on plain paper by a process which comprises imagewise exposing said imaging sheet to actinic radiation, forming an image on said developer material, transferring the image bearing developer layer to said plain paper, and separating said imaging sheet from said plain paper, wherein said image bearing developer layer remains adhered to said plain paper and said microcapsule layer remains adhered to said support.

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: A process for making melamine-formaldehyde microcapsules in an aqueous solution containing a high concentration of a water miscible or water soluble organic solvent is provided. The aqueous solution is prepared and a water insoluble melamine-formaldehyde pre-condensate is dissolved therein by adjusting the temperature and organic solvent concentration of the aqueous solution such that the melamine-formaldehyde pre-condensate is barely soluble therein. A substance to be encapsulated, preferably an oily solution containing a dyestuff precursor, is dispersed into the aqueous solution to form an emulsion, the melamine-formaldehyde pre-condensate being insoluble in the substance to be encapsulated.

Abstract: An excellent pressure-sensitive copying material which has an excellent color developing rate, little odor, and neither offset nor bleeding, said copying material comprising an electron-accepting developer and a solution of an electron-donating color former which produces colors upon contacting with said color developer, wherein it is characterized in that the solvent of said solution comprises a mixture of 20 to 80 weight % of sec-butyldiphenylmethane, 5 to 50 weight % of sec-butyldiphenylethane (1,1) and 5 to 50 weight % of sec-butyldiphenylethane (1,2).

Abstract: A light-sensitive microcapsule contains silver halide, a reducing agent, an ethylenically unsaturated polymerizable compound and a color image forming substance. Another light-sensitive microcapsule contains a photopolymerization initiator, an ethylenically unsaturated polymerizable compound and a color image forming substance. The microcapsules are prepared by a process comprising the steps of emulsifying an oily phase containing the silver halide, the reducing agent, the polymerizable compound and the color image forming substance (or an oily phase containing the photopolymerization initiator, the polymerizable compound and the color image forming substance) in an aqueous medium containing a water-soluble polymer in water; and forming the shell around the droplets of the oily phase.

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 pressure-sensitive recording sheet comprises a microencapsulated divinylphthalide compound represented by the following formula (I): ##STR1## wherein the microcapsules have the following particle size distribution:4.0 .mu.m.ltoreq.D.sub.50 .ltoreq.10.0 .mu.mD.sub.90 /D.sub.10 .ltoreq.2.0.

Abstract: Microcapsules which can be prepared at low temperatures contain walls composed of the product of an interface polyaddition and/or interface polycondensation reaction between a hydroxylamine and at least one component which is reactive with amino and alcohol groups. These microcapsules are advantageously used in the production of carbonless copying paper and thermal paper.

Abstract: A heat-developable copying material comprising a support having thereon a heat-developable light-sensitive layer comprising microcapsules containing a diazo compound and substantially no solvent, a coupling component and a color basic substance.

Abstract: A pressure development method is achieved by passing a sheet bearing a latent image through a pair of press rollers under non-pressure, stopping the conveyance of the sheet when an area of the sheet corresponding to the forward end of the latent image thereof reaches the nip between the pair of press rollers, applying pressure to the press rollers nipping the sheet, and rotating the press rollers so as to feed the sheet.

Abstract: An image transfer type recording method and kits for forming images on a receiving medium stably adheres a developer layer to any type of image receiving medium, such as, for example, plain paper, cloths, plastic films or the like. According to an image transfer type recording method, the image formation layer and the image receiving medium are adhered to each other by an adhesive layer. Therefore, the image formation layer can be stably adhered to any type of image receiving medium The image formation layer is adhered to the image receiving medium while being sandwiched between a thermoplastic resin layer and the adhesive layer. Therefore, the color of the image formed on the image formation layer is not faded or reduced in brightness, even if the image is formed on media made from cloth and such media on which the image is formed is washed.

Abstract: This invention relates to improved imaging systems based on the formation of yellow colored coordination compounds of transition metals with certain ligands. The formation of colored coordination compounds can be employed to generate images and is important in the manufacture and use of pressure sensitive transfer papers for preparing carbonless copies. In particular, this invention relates to certain ethanediimidic acid bis[(arylalkylidene)hydrazide] compounds, and particularly to certain ethanediimidic acid bis[(o-hydroxyarylalkylidene)hydrazide] compounds, to their coordination compounds with certain transition metals, and to their use in pressure sensitive carbonless copy paper systems. These compounds have been found to provide excellent yellow colors when used in pressure sensitive carbonless copy-papers wherein the image is formed by the reaction of a color-forming compound with transition metal salts such as those of nickel, cobalt, iron, copper, and similar materials.

Abstract: The invention relates to double-walled microcapsules each having a core of a hydrophobic substance, and a primary wall and a secondary wall formed therearound, the microcapsules being characterized in that the primary wall is composed of an amino resin prepared by polycondensation reaction of at least one member selected from the group consisting of:(1) urea and formaldehyde,(2) a methylolurea monomer or a low molecular weight polymer thereof, and(3) a methylated methylolurea monomer or a low molecular weight polymer thereof,and that the secondary wall is formed from a polyion complex of a cationic polyamide-epihalohydrin resin having a urea bond in the structural unit with a polystyrenesulfonic acid and/or a salt thereof; and a process for preparing the double-walled microcapsules.

Abstract: An image transfer type recording method for forming a visible image on a developer medium comprising a base sheet, a thermoplastic resin layer, and a developer material layer which is color-reactable with a chromogenic material laminated in this order, and transferring the visible image on the developer medium to any type of image supporting medium, comprising the steps of forming the visible image on the developer material layer through a color-reaction between the developer material and the chromogenic material, providing an adhesive layer on the developer material layer, superposing the developer material layer and the image supporting medium under pressure and heat to fixedly transfer the developer material layer having the visible image thereon to the image supporting medium, and peeling off only the substrate of the developer medium.

Abstract: An extracted and isolated soy protein polymer is used for prevention of premature coloration in CFB pressure-sensitive copying paper which is neutral- or alkaline-sized with an alkyl ketene dimer and which utilizes an acid clay color developer composition. The soy protein polymer may be carried by the base paper, e.g. as a result of size press or size bath application, or may be present in the microcapsule coating.

Abstract: An improved process for producing by interfacial reaction, a high solids an aqueous slurry of microcapsules is disclosed. Typical interfacial reaction involves the steps of emulsifying an oil phase containing the material to be encapsulated plus an oil-soluble, film-forming polyisocyanate in a continuous aqueous phase containing an emulsifying polymer under high shear conditions until the desired droplet size is obtained and then, under low shear conditions, adding a polyamine solution followed by an elevated temperature reaction sufficient to complete hardening of the polyurea capsule walls. The improvement of the invention comprising the introduction of a reaction period at elevated temperature between emulsification and polyamine addition, said reaction period permitting capsules of 10 microns or less average diameter to be made at greater than 40% by weight solids without agglomeration or resultant excess viscosity.

Abstract: Disclosed are oily droplets comprising an oily core containing a compound having an ethylenically unsaturated group and a film formed around the oily core which is composed of a reaction product of the compound having an ethylenically unsaturated group with a water-soluble polymer having a sulfinyl group. Also disclosed are microcapsules comprising the oily droplet and a resin wall formed therearound. Further disclosed are processes for preparing the oily droplets and the microcapsules.