Microspheres
AssigneeAkzo Nobel Chemicals International B.V.
InventorOve Nordin
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Abstract
The present invention relates to thermally expandable thermoplastic microspheres comprising a polymer shell made from ethylenically unsaturated monomers encapsulating a propellant, said ethylenically unsaturated monomers comprising from 21 to 80 wt % of methacrylamide and from 20 to 70 wt % methacrylonitrile, the total amount of methacrylamide and methacrylonitrile being from 70 to 100 wt % of the ethylenically unsaturated monomers. Furthermore, the invention relates to production and use of such microspheres.
Claims17
Thermally expandable thermoplastic microspheres comprising a polymer shell formed by a reaction product of ethylenically unsaturated monomers encapsulating a propellant, said ethylenically unsaturated monomers comprising from 31 to 80 wt % of methacrylamide and from 20 to 70 wt % methacrylonitrile, the total amount of methacrylamide and methacrylonitrile being from 70 to 100 wt % of the ethylenically unsaturated monomers.
Dependencies are inferred from the claim text.