Coated solder spheres and method for producing the same
AssigneeSenju Metal Industry Co., Ltd.
InventorsDaisuke Sohma, Takahiro Roppongi
Life of this patent
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Abstract
Solder spheres which can avoid blackening during transportation have a substantially uniform coating of a lubricant on the surfaces thereof. They are produced by dipping freshly prepared solder spheres in a lubricant solution with a concentration of from 10 ppm to 1000 ppm followed by collection of the spheres and drying. The lubricant is preferably selected from an aliphatic hydrocarbon lubricant, a higher fatty alcohol or acid lubricant, a fatty acid amide lubricant, a metal soap lubricant, a fatty acid ester lubricant, a fluoroplastic lubricant, a silicone lubricant, and a combination thereof.
Claims23
Solder spheres having a substantially uniform coating of a lubricant on the surfaces thereof.
A method for producing solder spheres coated with a lubricant, which comprises dipping solder spheres in a solution of a lubricant dissolved in an organic solvent with a concentration of from 10 ppm to 1000 ppm, removing the solder spheres from the solution, and volatilizing the solvent remaining on the solder spheres to form a substantially uniform lubricant coating on the surfaces of the solder spheres.
A solder sphere composition comprising lubricant coated solder spheres consisting of solder spheres each having the same diameter and a substantially uniform coating consisting of a lubricant on each of the surfaces of the solder spheres, wherein the lubricant is selected from the group consisting of an aliphatic hydrocarbon lubricant, a higher fatty alcohol lubricant, a higher fatty acid lubricant, a fatty acid amide lubricant, a metal soap lubricant, a fatty acid ester lubricant, a fluoroplastic lubricant, a silicone lubricant, and combinations thereof.
A solder sphere composition consisting of a plurality of lubricant coated solder spheres consisting of solder spheres and a substantially uniform coating consisting of a lubricant on the surface of each of the solder spheres, wherein each of the solder spheres has the same diameter and the diameter is sized for placement onto a substrate for use in a ball grid array package, wherein the lubricant is selected from the group consisting of an aliphatic hydrocarbon lubricant, a higher fatty alcohol lubricant, a higher fatty acid lubricant, a fatty acid amide lubricant, a metal soap lubricant, a fatty acid ester lubricant, a fluoroplastic lubricant, a silicone lubricant, and combinations thereof.
Dependencies are inferred from the claim text.