摘要:
Discrete, substantially spherical microcapsules having a solid polymeric shell and a solid, non-tacky polymeric core, which is grafted to the polymeric shell, are provided. Such microcapsules may be coated onto cellulosic substrates or incorporated into such substrates and subsequently fused to provide cellulosic substrates having a polymeric film bonded thereto and increased strength, respectively. The grafting of the normally nonadherent core material to the shell of the microcapsules provides a means of forming a bond between a normally nonadherent polymer and a cellulosic material. The microcapsules may be effectively employed as load-bearing agents and opacifying agents.
摘要:
Opaque release sheet comprising a base having a coating comprising a primary release agent in the form of air-containing microcapsular opacifiers which may be used in combination with a minor amount of a secondary release agent, such as silicone-poly-glycol copolymer, a methoxysilane, polyethylene, a metal complex or the like, provide opaque, lightweight, dimensionally stable release sheets.
摘要:
Pressure-rupturable, oil-containing microcapsules are produced by admixing a water-immiscible, oily material containing an oil-soluble, cross-linking agent, which is either a polyfunctional isocyanate or an orthoester of a group IV element with an aqueous solution of an emulsifying agent comprising starch having ether-linked aralkyl groups, to cross-link the emulsifier and form a capsule wall at the oil/water interface of the resulting oil-in-water emulsion around the oil droplets. The emulsifying agent is the sole co-reactant for the oil-soluble cross-linking agent.
摘要:
Opaque release sheet bearing a coating on one side thereof comprising a primary release agent in the form of air-containing microcapsular opacifiers in combination with a minor amount of a secondary release agent, such as a silicone polyglycol copolymer, a methoxysilane, polyethylene, a metal complex or the like, and the opposite side coated with a tacky, pressure-sensitive adhesive. A laminate comprising a substrate carrying a layer of said adhesive adjacent a layer comprising the aforesaid release composition.
摘要:
A fingerprinting system comprising means capable of releasably retaining a liquid and a liquid composition releasably retained in said means, said liquid composition comprising a leuco chromogenic compound and an oleophilic solvent therefor, and a substrate for receiving fingerprints associated therewith, said substrate being coated on at least a portion of one surface thereof with a color-developing substance capable of reacting with said chromogenic compound to produce a colored reaction product. The invention also comprises the method of fingerprinting utilizing such system.
摘要:
Microcapsules are formed in the absence of coacervation by providing an oil-in-water emulsion containing a polymeric, emulsifying agent having cross-linkable groups or complexing sites and admixing with the emulsion a cross-linking agent or a complexing agent which forms an impermeable coating around the dispersed oil droplets. The emulsifying agent may be non-proteinaceous or the protein, gelatin. Impermeable capsule walls are formed solely by the addition of the cross-linking or complexing agent and extraneous hardening agents are obviated. Moreover, the emulsifying agent may be a preformed, polymeric, cross-linking agent which eliminates the need for any separate cross-linking agent.
摘要:
A pressure-sensitive chromogenic copy system comprising a transfer sheet having on at least a portion of at least one surface thereof a color developer capable of reacting with a chromogen to form a color image, said color developer comprising a crude reaction medium resulting from reactants used to prepare a salicylate and also containing therein at least one metal compound of such salicylate, the resultant transfer sheet, color developer and process for making such color developer.
摘要:
Microcapsules containing oily droplets are produced in the absence of coacervation by admixing a partially condensed, formaldehyde condensation product in an aqueous medium and an oil-in-water emulsion, which emulsion comprises water-immiscible oily material as the disperse phase and an aqueous colloidal solution of an amphiphilic emulsifying agent as the dispersion medium. This single admixing effects the separation of the resin from the aqueous medium and precipitation thereof in solid particle form about a nucleus of the oily material, and the resulting microcapsules have a high degree of structural integrity.
摘要:
The present invention comprises a pressure-sensitive chromogenic copy system comprising a transfer sheet having on at least a portion of at least one surface thereof a coating of microcapsules having encapsulated therein a solution in an oleophilic solvent of the reaction product of at least one leuco chromogenic compound and at least one electron-accepting color developer capable of reacting with said leuco chromogenic compound in an oleophilic solvent; the oleophilic solvent being a solvent for said leuco chromogenic compound, said color developer and said reaction product. The invention also comprises the transfer sheets, microcapsules, and method of making such microcapsules.
摘要:
A self-contained liquid composition for use in making fingerprints comprising the reaction product of at least one leuco or non-leuco chromogenic compound and at least one color-developing substance in a liquid vehicle that is a solvent for said chromogenic compound and reaction product and a solvent or dispersant for said color-developing substance. The method of fingerprinting and a fingerprinting system utilizing the liquid composition are also disclosed.