Patent ID: 7947370

Claim:
Microcapsules comprising: a) a core containing at least one rubber additive, b) at least two shells made from an amino resin or phenol formaldehyde resin, wherein the shells together have a thickness between 30 and 100 nm; and, c) at least one sliding or wearing layer applied to the surface of the microcapsules selected from the group of polyacrylates, polyacrylonitriles, polyethylene glycols, ethyl celluloses, starch fatty acid esters and starch carbamates of long-chain isocyanates, or from low-molecular inorganic or organic compounds selected from the group of waxes, fatty acid derivatives, silicones, siloxanes and silicates, wherein the shells and the sliding or wearing layer together have a thickness between 40 and 200 nm.