Carbonless manifold business forms

Abstract

Sets of manifold business forms are coated on selected surfaces thereof with chemicals which are capable of reacting with each other to produce a colored mark. In one arrangement at least one intermediate sheet is coated on one surface with a composition of a record-developing material (which is generally solid) and a non-compatible color precursor (which is generally in the form of a microencapsulated liquid) to thereby function as both a record-receiving and a color-transfer surface upon reacting with the coating of at least another separate sheet of the set containing another compatible color precursor and/or another record-developing material on the surface thereof. In another arrangement, some of the sheets are coated front and back with a record-developing material, while others are coated front and back with a microencapsulated color precursor. In each of the arrangements the sheets of the manifolded sets are capable of being so arranged such that by removal of certain parts of the sets or turning certain parts upside down and applying pressure on the backs of the sets, images may be developed on both sides of the sheets.

I claim: 
     
       1. A manifold set of carbonless recording sheets, comprising: a stack including at least two superimposed sheets;   each of said sheets having on each of its surfaces, a coating comprising an initially colorless color forming reactive component,   a reactive component of each of the coatings of one of said sheet being .Iadd.in a transferable form such that the same will be transferred from said one sheet to an adjacent sheet in response to application of pressure to said stack and being .Iaddend.capable of reacting to produce a colored mark with a reactive component of each of the coatings of a second of said sheets upon coming into reactive contact therewith, .Iadd.   said reactive component of each of the coatings of said second sheet being in a non-transferable form such that the produced mark is presented on said second sheet, .Iaddend.   said one sheet being disposed in overlying relationship to said second sheet such that one of its coatings is disposed against one of the coatings of said second sheet, whereby upon application of pressure to said stack, said one coating of said one sheet is forced into said reactive contact with said one coating of the second sheet to thereby produce a colored mark,   said sheets being capable of rearrangement such that said one sheet overlies said second sheet with its other coating disposed against the other coating of the second sheet, whereby upon application of pressure to said stack said other coating of said one sheet is forced into said reactive contact with said other coating of the second sheet to thereby produce another colored mark.  .[.2. A manifold set as set forth in claim 1 wherein each of the coatings of a first of said sheets comprises a plurality of pressure rupturable microcapsules containing said color forming reactive component thereof, said microcapsules being rupturable   
     
     
        upon application of said pressure to said stack..]. 3. A manifold set as set forth in claim 1 wherein each of the coatings of said one sheet comprises a plurality of pressure rupturable microcapsules containing said color forming reactive component thereof, said microcapsules being rupturable upon application of said pressure to said stack. .[.4. A manifold set of carbonless recording sheets comprising: a stack including at least three superimposed sheets;   the initially uppermost and the middle sheets each having a coating on their respective back surface, and the initially lowermost sheet having a coating on its front surface, said coatings each comprising an initially colorless color forming reactive component,   a reactive component of the coating of the uppermost sheet and the lowermost sheet being capable of reacting to produce a colored mark with a reactive component of the coating of said middle sheet upon coming into reactive contact therewith,   said middle sheet being initially disposed in overlying relationship to said lowermost sheet such that its back coating is disposed against said front coating of the lowermost sheet, whereby upon application of pressure to the stack, said back coating of the middle sheet is forced into said reactive contact with the front coating of the lowermost sheet to thereby produce a colored mark,   said sheets being capable of rearrangement such that said middle sheet overlies said initially uppermost sheet with said back surface of the middle sheet disposed against said back surface of the initially uppermost sheet, whereby upon application of pressure to the stack, said back coating of the middle sheet is forced into said reactive contact with the back coating of the intially uppermost sheet to thereby produce another colored mark..].  .[.5. A manifold set as set forth in claim 4 wherein the coating of at least one of said sheets comprises a plurality of pressure rupturable microcapsules containing a color forming reactive component thereof, said microcapsules being rupturable upon application of said pressure to said stack..]. .[.6. A manifold as set forth in claim 4 wherein the coating of said middle sheet comprises a plurality of pressure rupturable microcapsules containing a color forming reactive component thereof, said microcapsules being rupturable upon application of said pressure to said stack..].