Microcapsules and their production

Details Microcapsules and their production Microcapsules and their production

1987-02-18

1991-10-01

Lovering, Richard D.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

8526, 264 41, 264 43, 264 47, 42840221, 503213, B01J 1310, B01J 1320

Patent

active

050532774

ABSTRACT:
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.

REFERENCES:
patent: 3287154 (1966-11-01), Haas
patent: 3535139 (1970-10-01), Watanabe et al.
patent: 3906123 (1975-09-01), Vincent et al.
patent: 4197346 (1980-04-01), Stevens
patent: 4303719 (1981-12-01), Vassiliades
patent: 4347283 (1982-08-01), Hiraishi et al.
patent: 4480002 (1984-10-01), Asano et al.
patent: 4578339 (1986-03-01), Adkins
patent: 4686548 (1987-08-01), Takahashi et al.

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