Microcapsules having capsule walls formed of aliphatic diisocyan

Details Microcapsules having capsule walls formed of aliphatic diisocyan Microcapsules having capsule walls formed of aliphatic diisocyan

1984-12-12

1986-11-11

Lovering, Richard D.

Stock material or miscellaneous articles

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

Particulate matter

252364, 264 47, 346213, B01J 1302, B32B 2740

Patent

active

046222677

ABSTRACT:
In microcapsules of the type used for pressure-sensitive, carbonless copy papers, having walls formed from aliphatic diisocyanate and diamine and containing a solvent mixture with a dye precursor dissolved therein, the solvent mixture containing a component which easily dissolves the dye precursor and the capsule wall material and a component which only poorly dissolves the dye precursor and the capsule wall, the improvement comprising the poorly disolving solvent component is an alkylbenzene having from 8 up to 14 C-atoms in the alkyl moiety; and the easily dissolving solvent component is selected from the group consisting of diisopropyl naphthaline, a hydrogenated terphenyl, an alkylated diphenyl, a diphenyl alkane, a chloroparaffin and a mixture thereof, the ratio of easily to poorly dissolving components ranging from 15:85 to 75:25 vol %, and being adjusted within this range so that a solution of the wall-forming aliphatic diisocyanate is just at the turbidity point in the mixture of easily dissolving and poorly dissolving components.

REFERENCES:
patent: 3886085 (1975-05-01), Kiritani et al.
patent: 3968301 (1976-07-01), Sears
patent: 4275905 (1981-06-01), Miller
patent: 4299723 (1981-11-01), Dahm et al.
patent: 4406816 (1983-09-01), Sliwka

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