Olefinic thermoplastic polymer compositions with fillers of nanometer scale in the form of masterbatches
AssigneeArkema France
InventorBERNARD PEES
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Abstract
The invention relates to thermoplastic polymer compositions in the form of masterbatches, comprising a matrix of an olefinic copolymer obtained from olefinic monomers and at least one alkyl(meth)acrylate monomer, in which exfoliable organophilic fillers of the lamellar type are dispersed, such as silicates, characterized in that after complete dispersion, the fillers are of nanometer scale with a content of at least 20% by weight with relation to the composition. The invention is further of application for the production of polymeric materials particularly of the polyethylene type, with fillers, the thermomechanical and barrier properties of which are improved.
Claims8
A process for incorporating high levels of exfoliated fillers in unfunctionalized polyolefins without requiring high shear rates comprising the steps of
- a) blending a masterbatch and a thermoplastic polymer, and
- b) extruding said blend to form a nanocomposite filler resin,
- wherein said masterbatch comprises a matrix consisting of one or more unfunctionalized olefin copolymers comprising 60 to 98% by weight of alpha-olefin monomer units and 2 to 40% by weight of alkyl(meth)acrylate monomer units, and wherein said olefin copolymer has an MFI of from 0.1 to 50 g/10 min;
- said matrix having dispersed therein exfoliable organophilic fillers of the lamellar type, wherein said dispersed fillers are of nanoscale size and comprise at least 20% by weight relative to the masterbatch.
Dependencies are inferred from the claim text.