microesféras térmicamente expansìveis, processo para pruduzir microesféras térmicamente expansìveis, uso de microesferas termicamente expansìveis, composição expansìvel e artigo.

摘要

The invention relates to thermally expandable microspheres comprising a thermoplastic polymer shell and a propellant entrapped therein, wherein said polymer shell is made of a homo- or co-polymer from ethylenically unsaturated monomers comprising more than 85 wt% of nitrile containing monomers and said propellant comprises more than 50 wt% of isooctane. The invention further relates to preparation and use of expandable microsperes, a composition comprising expandable microspheres and articles comprising foamed material containing expanded microspheres.