Pressure sensitive recording sheet

Details Pressure sensitive recording sheet Pressure sensitive recording sheet

1975-01-16

1977-05-03

Lovering, Richard D.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

282 275, 427151, 428905, 428914, B32B 326

Patent

active

040215954

ABSTRACT:
A pressure sensitive recording sheet having thereon a layer of fine oil microcapsules produced by the process which comprises dispersing or emulsifying finely in a polar solvent an oily liquid containing a substantially colorless color former capable of reacting with a developer to form a colored product and a polyisocyanate adduct having a free isocyanate group and adding to the dispersion or emulsion of the oil droplets a polyamine or a polyamine adduct having a free amino group as a polymerization promotor, whereby the polymerization of the polyisocyanate adduct is caused from the outer side of each oil droplet to encapsulate the oil droplet by the insolubilized polyisocyanate adduct. By this process the size of the microcapsules can be controlled quite easily.

REFERENCES:
patent: 3429827 (1969-02-01), Ruus
patent: 3432327 (1969-03-01), Kan et al.
patent: 3577515 (1971-05-01), Vandegaer
patent: 3726804 (1973-04-01), Matsukawa et al.

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