Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From sulfur-containing reactant
Reexamination Certificate
2008-01-18
2009-08-11
Truong, Duc (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From sulfur-containing reactant
C528S373000, C528S377000, C528S378000, C526S256000, C525S535000, C524S418000, C524S609000
Reexamination Certificate
active
07572880
ABSTRACT:
An improved process for preparing regioregular substituted polythiophenes is described where a substituted thiophene having at least two leaving groups is treated with an organomagnesium halide followed by zinc chloride or bromide and the resulting reaction mixture in solution is polymerized with a Ni(II) catalyst.
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Rieke Metals Inc.
Schwegman Lundberg & Woessner, P.A.
Truong Duc
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