Microcapsules having walls made of polyisocyanate/guanidine reac

Details Microcapsules having walls made of polyisocyanate/guanidine reac Microcapsules having walls made of polyisocyanate/guanidine reac

1995-02-21

1997-06-03

Nutter, Nathan M.

Drug, bio-affecting and body treating compositions

Preparations characterized by special physical form

Particulate form

424490, 424497, 424501, 4284022, 42840221, 42840222, 264 41, 264 433, 264 47, 503200, 503215, B01J 1302, C08G 1838, B41M 5165

Patent

active

056352115

ABSTRACT:
Novel microcapsules are characterized in that their walls are made of reaction products of guanidine compounds and polyisocyanates or contain such reaction products. Dispersions containing such microcapsules can be prepared by replacing the amines, amino alcohols or hydrazine compounds in processes known per se for preparing microcapsule dispersions from polyisocyanates and amines, amino alcohols or hydrazine compounds by guanidine compounds. The present invention also relates to no-carbon copy papers containing dyestuff precursors in microcapsules whose walls are made of reaction products of guanidine compounds and polyisocyanates or contain such reaction products.

REFERENCES:
patent: 4804687 (1989-02-01), Weimann et al.

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