Browse Prior Art Database

High Thermal Stability, Water Soluble Flux Solder Paste

IP.com Disclosure Number: IPCOM000121412D
Original Publication Date: 1991-Aug-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 1 page(s) / 43K

Publishing Venue

IBM

Related People

Clark, FE: AUTHOR [+4]

Abstract

Disclosed is a flux for combination with high melt solder powders to make a solder paste that screens, reflows, does not char, and cleans well with deionized water. It can also be used as a simple flux for wave or repair solder applications when prepared at the correct viscosity.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 92% of the total text.

High Thermal Stability, Water Soluble Flux Solder Paste

      Disclosed is a flux for combination with high melt solder
powders to make a solder paste that screens, reflows, does not char,
and cleans well with deionized water.  It can also be used as a
simple flux for wave or repair solder applications when prepared at
the correct viscosity.

      Water-soluble flux solder pastes are becoming increasingly
important to the electronics industry as a method for attachment of
components.  Traditional paste fluxes require chlorofluorocarbon
cleaning which, with the advent of the Montreal protocol, must be
eliminated. Additionally, traditional paste fluxes are many-component
mixtures of rosin and added ingredients, making quality control
difficult.  Fluxes for solder alloys that require temperatures over
30~C are difficult to find as most organic compounds are not stable
to such high temperatures. Materials that decompose and char make
cleaning difficult.

      This few-component, very simple water-soluble flux solder paste
has the correct rheology and reflow characteristics for high
temperature reflow solders.  This formulation is a combination of
polyethyleneoxides and alkanolamine (such as triethanolamine) and
thermally stable acids (such as adipic acid).  The combination of
polyethyleneoxides and alkanolamine interacts by hydrogen bonding to
give the correct rheology for screening.  Both the alkanolamine and
the acid are active fluxing agents. The past ref...