Resin powder material, laser powder molding method and device
AssigneeHitachi, Ltd.
InventorsSatoshi Arai, Shigeharu Tsunoda
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Abstract
A resin powder material comprising copolymerized polybutylene terephthalate resin powder and an inorganic substance, for example, fumed silica, having an average primary particle diameter of 100 nm or less in an amount up to 1.0 wt %. The polybutylene terephthalate resin comprises from 5 mol % to 15 mol % of Isophthalic acid and has powder with average particles diameter of 79 μm and a maximum particles diameter of 106 μm. Powder is obtained by grinding pellets of the copolymerized polybutylene terephthalate resin having a viscosity of 0.85 to 1.0 dl/g. Powder composition used for production of molded articles by powder laminate molding process.
Claims8
A resin powder material comprising:
- a polybutylene terephthalate resin powder having a crystallization temperature lower than that of a homopolybutylene terephthalate resin powder, wherein said polybutylene terephthalate resin powder is a copolymer comprising an isophthalic acid component in an amount of from 5 mol % to 15 mol % of said polybutylene terephthalate resin powder, and a first inorganic substance comprising a fumed silica having an average primary particle diameter of 100 nm or less in an amount of 0.05 or more but less than 1.0 wt % of said polybutylene terephthalate resin powder,
- wherein the polybutylene terephthalate resin powder has an average particle diameter of 79 μm and a maximum particle diameter of 106 μm or less,
- wherein the homopolybutylene terephthalate resin powder has an average particle diameter of 83 μm and a maximum particle diameter of 106 μm or less,
- wherein the polybutylene terephthalate resin powder is formed from a plurality of pellets having a viscosity of 0.85 to 1.0 dl/g, and
- wherein a difference between a melting point temperature of the polybutylene terephthalate resin powder and the crystallization temperature of the polybutylene terephthalate resin powder is about 19° C. lower than a difference between a melting point temperature of the polybutylene terephthalate resin pellets and the crystallization temperature of the polybutylene terephthalate resin pellets, and
- wherein said resin powder material is used for powder laminate molding.
Dependencies are inferred from the claim text.