| abstract |
A core shell microcapsule comprising a benefit agent contained in a leaky inner shell, characterised in that: a) the inner shell is coated with an insoluble polyamide with a water solubility of less than 1 g/litre at 25 °C formed by the reaction of: (i) at least one low molecular weight aliphatic dicarboxylic acid having from 3 to 12 carbon atoms, or ester thereof; (ii) at least one poly(alkylene glycol) polyamine having the formula (I): H 2 N-(-C(R)H-CH 2 -O-)x-C(R)H-CH 2 -NH 2 where x ranges from about 2 to 5, R is an alkyl of one to four carbon atoms; (iii) at least one high molecular weight dicarboxylic acid (dimer) having from 20 to 40 carbon atoms, or ester thereof; wherein the mole ratios of, (i) to (iii) and (ii) to (iii) are each at least 2:1 and wherein the coating further comprises a polyisocyanate crosslinker. |