Process for preparing microrods using liquid-liquid dispersion

Details Process for preparing microrods using liquid-liquid dispersion Process for preparing microrods using liquid-liquid dispersion

2008-01-29

2008-01-29

Boykin, Terressa (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Treating polymer containing material or treating a solid...

C424S426000, C424S489000, C424S497000, C514S054000, C521S025000, C521S050000, C521S056000, C521S099000, C521S186000

Reexamination Certificate

active

07323540

ABSTRACT:
The invention provides a method for forming polymer microrods, the method including the steps of providing a polymer solution comprising a polymer dissolved in a first solvent; providing a dispersion medium comprising a second solvent, wherein the first solvent and the second solvent are miscible or partially soluble in each other, and wherein the polymer is insoluble in the second solvent; adding the polymer solution to the dispersion medium to form a dispersed phase of polymer solution droplets within the dispersion medium; and introducing a shear stress to the dispersion medium and dispersed polymer solution droplets for a time and at a shear rate sufficient to elongate the polymer solution droplets to form microrods and solidify the microrods by attrition of the polymer solvent into the dispersion medium.

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