Microcapsules having walls made of polyisocyanate/guanidine reaction products
AssigneeBayer Aktiengesellschaft
InventorsUlrich Nehen, Jurgen Weisser
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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.
Claims9
Microcapsules, characterized in that their walls are made of reaction products of guanidine compounds of the formula (I) ##STR4## in which X represents HN.dbd., ##STR5## Y represents H--, NC--, H.sub.2 N--, HO--, ##STR6## or salts thereof with acids and polyisocyanates or contain such reaction products.
Dependencies are inferred from the claim text.