Pellet comprising an axial core and a polymer sheath, and its manufacture
AssigneeSabic Global Technologies B.V.
InventorsCarmela Tufano, Zahra Fahimi
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Abstract
Pellet having an axial direction and comprising a core that extends in the axial direction and further comprising a polymer sheath applied around said core, wherein said core comprises a plurality of filaments that extend in the axial direction; said polymer sheath is at least substantially free of said filaments; said polymer sheath comprising a plurality of filler particles; said pellet comprises at least 30%, preferably at least 35%, more preferably at least 40%, and preferably at most 60%, preferably at most 50%, of filaments by weight of the total weight of said pellet. Further disclosed is a reinforced article obtained from molding a plurality of said pellets, and a method of making such a pellet.
Claims21
A pellet having an axial direction;
- said pellet comprising a core that extends in the axial direction and comprising a polymer sheath which has been applied around said core, wherein:
- said core comprises a plurality of filaments that extends in the axial direction;
- said polymer sheath is at least substantially free of said filaments;
- said polymer sheath comprising a plurality of filler particles;
- wherein the filler particles are glass bubbles, nanoclay particles or a combination thereof,
- said pellet comprises at least 30% of filaments by weight of the total weight of said pellet,
- wherein said pellet has a density of greater than 0 to 1.3 g/cm3 and an effective isotropic modulus of between 4 and 6 (m/s)2.
A method of making a pellet comprising:
- i) unwinding from a package of a plurality of continuous filaments;
- ii) optionally applying a impregnating composition to said plurality of filaments to form an impregnated plurality of filaments;
- iii) providing a polymer composition comprising at least one polymer and a plurality of filler particles wherein the filler particles are glass bubbles, nanoclay particles or a combination thereof,
- iv) applying a sheath of polymer comprising filler particles around the impregnated plurality of continuous filaments to form a sheathed bundle comprising a core comprising said plurality of filaments and comprising a sheath comprising said polymer and filler particles:
- and
- v) cutting the sheathed bundle into individual pellets comprising a core that extends in the axial direction and comprising a polymer sheath which has been applied around said core, wherein:
- said core comprises a plurality of filaments that extends in the axial direction;
- said pellet comprises at least 30% of filament by weight of the total weight of said pellet;
- said polymer sheath is at least substantially free of filaments;
- said polymer sheath comprising a plurality of filler particles,
- wherein said pellet has a density of greater than 0 to 1.3 g/cm3 and an effective isotropic modulus of between 4 and 6 (m/s)2.
Dependencies are inferred from the claim text.