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US 6,586,107 B2Granted
Microcapsules having polyurea walls
AssigneeBayer Aktiengesellschaft
InventorsGünter Klug, Jürgen Weisser
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Abstract
The invention relates to microcapsules for which the walls comprise reaction products of polyisocyanates with guanidine compounds and amines.
Claims11
Microcapsules having walls comprising reaction products of polyisocyanates with guanidine compounds and amines, wherein the polyisocyanates are
- uretdione-containing polyisocyanates comprising
- (i) at least 70% by weight of a hexamethylene diisocyanate oligomer of the formula
- (ii) not more than 30% by weight of a compound of the formula
- where R is (CH2)6
- and/or
- a compound of the formula
3 more elements
Dependencies are inferred from the claim text.