Auxiliary joining agent and method for producing the same

Abstract

The purpose is, in mounting a semiconductor device onto a substrate, to make it easy to identify the remaining amount of an auxiliary joining agent, to stabilize the dispensing amount of the auxiliary joining agent, and to prevent a shortage of the auxiliary joining agent. Also for the purpose of efficient maintenance of a mounting machine, provided is an auxiliary joining agent adapted to aid joining of metals and prepared by dissolving a colorant in a solvent having a reducing property of removing an oxide film on a metal surface. The auxiliary joining agent is produced by a method including a step of mixing a solvent having a reducing property of removing an oxide film on a metal surface, and a colorant having a property of dissolving in the solvent.

1 . An auxiliary joining agent adapted to aid joining of metals,
 the auxiliary joining agent containing a solvent having a reducing property of removing an oxide film on a metal surface, and a colorant dissolved in the solvent,   the solvent including a multi-functional alcohol having a molecular weight of 50 to 200, and   the colorant having a property of volatilizing along with the solvent.   
     
     
         2 . (canceled) 
     
     
         3 . The auxiliary joining agent according to  claim 1 , wherein the solvent has a boiling point Tb, and the colorant has a melting point Tm, Tb and Tm satisfying Tb>Tm. 
     
     
         4 . The auxiliary joining agent according to  claim 1 , having hue, chroma, and brightness that are visually recognizable. 
     
     
         5 . The auxiliary joining agent according to  claim 1 , having a viscosity at 25° C. of 0.1 to 10 Pa·s. 
     
     
         6 . The auxiliary joining agent according to  claim 1 , wherein the colorant is an organic coloring matter. 
     
     
         7 . The auxiliary joining agent according to  claim 6 , wherein the organic coloring matter is at least one selected from the group consisting of azo compounds, cyanine compounds, and styryl compounds. 
     
     
         8 . The auxiliary joining agent according to  claim 1 , containing the colorant in an amount of 0.01 to 50 mass %. 
     
     
         9 . (canceled) 
     
     
         10 . (canceled) 
     
     
         11 . The auxiliary joining agent according to  claim 1 , wherein the multi-functional alcohol is at least one selected from the group consisting of glycerin, ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, carbitol, and cellosolve alcohol. 
     
     
         12 . A production method of an auxiliary joining agent,
 the auxiliary joining agent being adapted to aid joining of metals,   the method including a step of mixing a solvent having a reducing property of removing an oxide film on a metal surface, and a colorant having a property of dissolving in the solvent,   the solvent including a multi-functional alcohol having a molecular weight of 50 to 200, and   the colorant having a property of volatilizing along with the solvent.   
     
     
         13 . The production method of an auxiliary joining agent according to  claim 12 , wherein
 the solvent has a boiling point Tb, and the colorant has a melting point Tm, Tb and Tm satisfying Tb>Tm, and   the method further includes a step of simultaneously heating the solvent and the colorant mixed together, at a temperature lower than the boiling point Tb of the solvent and higher than the melting point Tm of the colorant.   
     
     
         14 . The production method of an auxiliary joining agent according to  claim 12 , the method includes allowing an amphiphilic substance with respect to the solvent and the colorant to be contained in a mixture of the solvent and the colorant.