Post-treatment of polyurea microcapsules

Details Post-treatment of polyurea microcapsules Post-treatment of polyurea microcapsules

1976-02-17

1977-09-06

Cockeram, H.S.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

252316, 260 25A, 260 25BD, 260 292TN, 260 75NA, 260 75NE, 260 775CH, 260 775SS, 427212, 427214, 427222, 528490, C08G 1882, B01J 1302, B05D 724

Patent

active

040467414

ABSTRACT:
Post-treatment of microcapsules having polyurea walls with ammonia or amines to reduce the residual isocyanate level and modify permeability of the microcapsule wall. Flowable formulations of the polyurea microcapsules then can be stored at pH values below 8 without generating carbon dioxide from the reaction of residual isocyanate groups with water.

REFERENCES:
patent: 2888408 (1959-05-01), Rogers et al.
patent: 3264089 (1966-08-01), Hansen
patent: 3409461 (1968-11-01), Mehlo et al.
patent: 3577515 (1971-05-01), Vandegaer
patent: 3655627 (1972-04-01), Hutzler et al.
patent: 3900669 (1975-08-01), Kiritani
Saunders et al., Polyurethanes, Part I, Interscience, N.Y., (1962), p. 65.

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