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US 9,249,283 B2Granted
Reduced density glass bubble polymer composite
AssigneeTundra Composites, LLC
InventorsKurt E. Heikkila, Rodney K. Williams, John S. Kroll
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Abstract
The invention relates to a hollow glass microsphere and polymer composite having enhanced viscoelastic and rheological properties.
Claims40
A shaped structural article formed by melt processing of a thermoplastic composite comprising a dispersion of a hollow glass sphere particulate in a continuous thermoplastic polymer phase, wherein the thermoplastic composite comprises:
- (a) greater than 70-90 vol. % of a hollow glass microsphere having a particle size greater than about 5 microns having a coating of about 0.005 to 8 wt. % of an interfacial modifier, the interfacial modifier free of a coupling agent, wherein the interfacial modifier coating allows for greater freedom of movement of the particles within the polymer phase of the composite, the percentages based on the composite;
- and
- (b) the polymer phase of the composiute free of tetrafluoroethylene, hexafluoropropylene, perfluoroalkylvinyl ether, polycarbonate, polyetherimid, and polysulfone.
A thermoplastic composite comprising a dispersion of a hollow glass sphere particulate in a continuous thermoplastic polymer phase, wherein the thermoplastic composite comprises:
- (a) greater than 70-90 volume-% of a hollow glass microsphere having a density greater than 0.10 gm-cm−3 and less than 5 gm-cm−3 and a particle size greater than 5 microns;
- and
- (b) the polymer phase free of tetrafluoroethylene, hexafluoropropylene, perfluoroalkylvinyl ether, polycarbonate, polyetherimide, and polysulfone;
- wherein the microsphere has a coating comprising about 0.005 to 3 wt. % of an interfacial modifier, the interfacial modifier free of a coupling agent wherein the interfacial modifier coating allows for greater freedom of movement of the particles within the polymer phase of the composite;
- and wherein the composite density is about 0.20 to 15 gm-cm−3, the percentage based on the composite.
2 more elements
Dependencies are inferred from the claim text.