Coating processes – Transfer or copy sheet making – Reactive components
Patent
1975-08-28
1977-03-01
Herbert, Jr., Thomas J.
Coating processes
Transfer or copy sheet making
Reactive components
427151, 427153, 428914, B41M 516
Patent
active
040102920
ABSTRACT:
In accordance with certain of its aspects, the novel process of this invention for making pressure-sensitive record sheets comprises the steps of forming a dispersion of microcapsules, the microcapsules being the product of microencapsulating a solution of a color precursor in an oil carrier; the walls of the microcapsules being substantially oil and water impermeable; forming an aqueous mixture containing a color developer for the encapsulated color precursor; adding a color suppressant to the dispersion of microcapsules, to the aqueous mixture or partially to both in an amount or amounts effective to substantially prevent color formation between the color developer and any unencapsulated color precursor; the color suppressant being a nitrogen containing basic organic compound selected from the group consisting of: amines, imines and aziridines; combining the aqueous mixture containing the color developer, the color suppressant and the microcapsules to form an aqueous coating composition; and applying the aqueous coating composition to a substrate in a single pass through substrate coating apparatus.
In accordance with certain other aspects of this invention, the novel product of this invention is an aqueous slurry for coating pressure-sensitive record sheets, the novel slurry including a plurality of microcapsules, the microcapsules containing a solution of a color precursor in an oil carrier, the walls of the microcapsules comprising a reaction product of a wall forming compound and a cross-linking agent; a color developer for the color precursor; and a color suppressant comprising a nitrogen containing basic organic compound selected from the group consisting of: amines, imines and aziridines, the color suppressant being present in the aqueous slurry in an amount sufficient to substantially prevent color formation between the color developer and any unencapsulated color precursor.
REFERENCES:
patent: 3554781 (1971-01-01), Matsukawa
patent: 3672935 (1972-06-01), Miller et al.
patent: 3809668 (1974-05-01), Yarian
patent: 3901986 (1975-08-01), Brockett et al.
patent: 3916068 (1975-10-01), Kohmura et al.
Schwab Gerhart
Shackle Dale Richard
Herbert, Jr. Thomas J.
Hess Bruce H.
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