Patent ID: 8648028

Claim:
A capsule comprising a core and a shell surrounding the core, wherein the shell comprises a polymeric material, and wherein the polymeric material is produced by reacting a component (A) with a component (B), wherein component (A) comprises one or more polysiloxanes bearing one or more amino groups and component (B) comprises one or more polyisocyanates; and the polymeric material comprises groups of structure G1: [NH—CO—NR 1 —R 2 —Si(R 3 ) n O( 3-n ) (G1) and optionally comprises groups of structure G2: [NH—CO—NH] (G2) wherein: R 1 is selected from the group consisting of H, an NH 2 -substituted unbranched alkyl, an NH 2 -substituted branched alkyl and an NH 2 -substituted cycloalkyl; R 2 is an unsaturated or saturated hydrocarbon; R 3 is selected from the group consisting of unbranched or branched alkyl and cycloalkyl; n=0 or 1; and each O atom bound directly to the Si atom of G1 is bound directly to a further Si atom.