Magnetic polymer composite
First Claim
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1. A rod-shaped article, adapted to be used in a hand actuated hot-melt adhesive applicator or dispenser, comprising a thermoplastic magnetic composite, wherein the magnetic composite comprising:
- (a) a thermoplastic polymer phase comprising 0.6 to 92 wt. % and 14 to 60 vol. % of the composite, the polymer characterized by melt flow properties such that the viscosity of the polymer at about 265°
C. is about 500-2000 cP; and
(b) a magnetic particulate comprising 3 to 99.4 wt. % and 31 to 86 vol. % of the composite, the particulate intermixed with the polymer phase, the particulate having about 0.005 to 3 wt. % of a coating of an interfacial modifier wherein the interfacial modifier at least partially coats the particulate, the particulate having a particle size where no more than 10 wt. % of the particles are under 10 microns;
wherein the particulate and polymer phase comprise greater than 95 vol. % of the composite, the composite having a density of 0.2 to 16 g/cm3 and a viscosity of less than about 100,000 cP at about the melt temperature of the composite.
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Abstract
The invention relates to a hot melt dispensable polymeric composite and process for making and using the composite. Particulates of adequate particle size are mixed with a polymer that exhibits low viscosities at temperatures typically provided by hot-melt glue guns to form rods that vary significantly in density from the base polymer. Novel articles can be manufactured by dispensing the composite from a glue gun into molds or by placement of the melt molding compound into preformed cavities within an end article.
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Citations
12 Claims
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1. A rod-shaped article, adapted to be used in a hand actuated hot-melt adhesive applicator or dispenser, comprising a thermoplastic magnetic composite, wherein the magnetic composite comprising:
- (a) a thermoplastic polymer phase comprising 0.6 to 92 wt. % and 14 to 60 vol. % of the composite, the polymer characterized by melt flow properties such that the viscosity of the polymer at about 265°
C. is about 500-2000 cP; and
(b) a magnetic particulate comprising 3 to 99.4 wt. % and 31 to 86 vol. % of the composite, the particulate intermixed with the polymer phase, the particulate having about 0.005 to 3 wt. % of a coating of an interfacial modifier wherein the interfacial modifier at least partially coats the particulate, the particulate having a particle size where no more than 10 wt. % of the particles are under 10 microns;
wherein the particulate and polymer phase comprise greater than 95 vol. % of the composite, the composite having a density of 0.2 to 16 g/cm3 and a viscosity of less than about 100,000 cP at about the melt temperature of the composite. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- (a) a thermoplastic polymer phase comprising 0.6 to 92 wt. % and 14 to 60 vol. % of the composite, the polymer characterized by melt flow properties such that the viscosity of the polymer at about 265°
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8. A process of manufacturing a shaped magnetic article, the process comprising:
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(i) using a hand actuated hot melt applicator, heating a portion of a rod to form a heated portion, the rod comprising a thermoplastic magnetic composite, the composite comprising; (a) a thermoplastic polymer phase comprising 0.6 to 92 wt. % and 14 to 60 vol. % of the composite, the polymer characterized by melt flow properties such that the viscosity of the polymer at about 265°
C. is about 500-2000 cP; and(b) a magnetic particulate comprising 3 to 99.4 wt. % and 31 to 86 vol. % of the composite, the particulate intermixed with the polymer phase, the particulate having about 0.005 to 3 wt. % of a coating of an interfacial modifier wherein the interfacial modifier at least partially coats the particulate, the particulate having a particle size where no more than 10 wt. % of the particles are under 10 microns; wherein the particulate and polymer phase comprise greater than 95 vol. % of the composite, the composite having a density of 0.2 to 16 g-cm3 and the composite having a viscosity of lower than 100,000 cP at about the melt temperature of the composite; (ii) forming the article by dispensing the heated portion through a nozzle of the applicator into an article shaped mold; and (iii) magnetizing the article. - View Dependent Claims (9, 10, 11, 12)
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Specification