Akzo Nobel N.v.

Klas Elfving

Anna Kron

Odd Bjerke

Peter Sj&ouml;gren

The invention concerns a process for preparation of light weight objects comprising calendering, extrusion, blow or injection moulding a resin of polypropylene, polystyrene, HD polyethylene or copolymers thereof and, admixed therein, thermally expandable microspheres including a thermoplastic polymer shell encapsulating a propellant, at a temperature sufficient to result in expansion of the microspheres, wherein said polymer shell is made of a homo- or co-polymer from ethylenically unsaturated monomers comprising more than 80 wt % of nitrile containing monomers. The invention further concerns light weight objects obtainable by the process.

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Kvissleby, Sweden

Klas Elfving