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Method for Suspension of Solid Particles in Polyamic Acid Solution

IP.com Disclosure Number: IPCOM000060631D
Original Publication Date: 1986-Mar-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Brady, MJ: AUTHOR [+4]

Abstract

Preparation of uniform coatings with suspended organic particles is accomplished prior to and concomitant with the synthesis of polyamic acid solution. Inorganic particles (i.e., powders of glass, copper, graphite, aluminum, (iron oxide) Fe2O3, etc.) are blended into a solution and reduced in size, prior to complete preparation of the intended polymer binder. The method precludes use of surfactants in suspending the inorganic solids and yields more homogeneous and longer life polyamic solutions.

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Method for Suspension of Solid Particles in Polyamic Acid Solution

Preparation of uniform coatings with suspended organic particles is accomplished prior to and concomitant with the synthesis of polyamic acid solution. Inorganic particles (i.e., powders of glass, copper, graphite, aluminum, (iron oxide) Fe2O3, etc.) are blended into a solution and reduced in size, prior to complete preparation of the intended polymer binder. The method precludes use of surfactants in suspending the inorganic solids and yields more homogeneous and longer life polyamic solutions.

The procedure begins with a diamine solution or an anhydride solution depending upon the pH relationship between the particles and the first solid component. The particles are then added to the organic solution and subjected to ball milling, sonification or shaking to break up the particle size and to encapsulate each particle with organic material. Finally, the second organic solid is added to the solution to complete the synthesis of the polyamic acid solution. The precursors to the polyamic acid solution are prepared in a 1:1 stoichiometric ratio. Complete synthesis is accomplished by rotating the container on a ball mill roller. Lastly, zirconium oxide ball milled particles are then removed by filtering through a fine wire screen.

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