The inventors found that the functional lifetime of an organic semiconductor device is greatly improved if halogens are not present in the liquids used to form the organic semiconductor. This invention requires the halogen content to be less than 100 ppm. The inventors used Aliquat 336 phase-transfer catalyst together with a palladium catalyst, triarylphosphine catalyst and toluene as the solvent to perform the Suzuki coupling-polymerization to assure low halogen content in both the product and solvent. The highly organophilic Aliquat 336 presumably enables the use of non-polar toluene as the solvent, though the Aliquat 336 loading can probably be optimized to a much lower level.
The utility of this patent specifically targets the ease of manufacture and lifetime of organic electroluminescent devices such as used in a planar or curved light source of illumination, a display apparatus such as a segment display apparatus and a dot matrix display apparatus or a backlight of a liquid crystal display apparatus.
This patent illustrates the use of phase-transfer catalysis in areas outside of the common PTC applications in pharma, agchem, petrochemical, flavor & fragrance and dye industries.
Achieve or improve low-cost high-performance green chemistry processes using phase-transfer catalysis at your company. Now contact Marc Halpern of PTC Organics to learn how we can help.
About Marc Halpern
Dr. Halpern is founder and president of PTC Organics, Inc., the only company dedicated exclusively to developing low-cost high-performance green chemistry processes for the manufacture of organic chemicals using Phase Transfer Catalysis. Dr. Halpern has innovated PTC breakthroughs for pharmaceuticals, agrochemicals, petrochemicals, monomers, polymers, flavors & fragrances, dyes & pigments and solvents. Dr. Halpern has provided PTC services on-site at more than 260 industrial process R&D departments in 37 countries and has helped chemical companies save > $200 million. Dr. Halpern co-authored five books including the best-selling “Phase-Transfer Catalysis: Fundamentals, Applications and Industrial Perspectives” and has presented the 2-day course “Practical Phase-Transfer Catalysis” at 50 locations in the US, Europe and Asia.
Dr. Halpern founded the journal “Industrial Phase-Transfer Catalysis” and “The PTC Tip of the Month” enjoyed by 2,100 qualified subscribers, now beyond 130 issues. In 2014, Dr. Halpern is celebrating his 30th year in the chemical industry, including serving as a process chemist at Dow Chemical, a supervisor of process chemistry at ICI, Director of R&D at Sybron Chemicals and founder and president of PTC Organics Inc. (15 years) and PTC Communications Inc. (20 years). Dr. Halpern also co-founded PTC Interface Inc. in 1989 and PTC Value Recovery Inc. in 1999. His academic breakthroughs include the PTC pKa Guidelines, the q-value for quat accessibility and he has achieved industrial PTC breakthroughs for a dozen strong base reactions as well as esterifications, transesterifications, epoxidations and chloromethylations plus contributed to more than 100 other industrial PTC process development projects.
Dr. Halpern has dedicated his adult life to his family and to phase-transfer catalysis (in that order!).
