Organic compounds -- part of the class 532-570 series – Organic compounds – Esters having the thiocarboxylate group – -cx- – wherein the...
Reexamination Certificate
2005-05-24
2009-12-15
Shiao, Rei-Tsang (Department: 1626)
Organic compounds -- part of the class 532-570 series
Organic compounds
Esters having the thiocarboxylate group, -cx-, wherein the...
Reexamination Certificate
active
07632959
ABSTRACT:
A thiocarbonylthio compound and free radical polymerization employing the same. The thiocarbonylthio compound is represented by formula (I) or (II):wherein Z can be independently perfluoroalkyl, alkyl, haloalkyl, aryl, alkylaryl, haloalkylaryl, arylalkyl, aminoalkyl, alkylamino, alkoxy, alkoxyaryl, alkylsulfonyl, alkylsulfonylaryl, dialkylphosphinyl, or dialkylphosphinothioyl; R1and R2can be each independently hydrogen, alkyl, aryl, alkylaryl, arylalkyl, aminoalkyl, alkylamino, alkoxy or alkoxyaryl; R3is alkyl, aryl, aminoalkyl, alkylamino, alkoxy or alkoxyaryl. Furthermore, R can also be alkyl, aryl, alkylaryl, arylalkyl, aminoalkyl, alkylamino, alkoxy, haloalkylaryl, alkylsilyl, alkylthio, alkylthioaryl, or substituent contaning CN, CO, COOH, COOCH3or heterocyclic moieties; and R4is perfluoroalkyl. The thiocarbonylthio compound can be used as a reversible chain transfer agent in a free radical polymerization to obtain a polymer with a controlled molecular weight and narrow polydispersity.
REFERENCES:
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Delduc et al. “A Convenient Source of Alkyl and Acyl Radicals” J. Chem. Soc., Chem. Commun. 1988, pp. 308-310.
Bertrand et al. “A Xanthate Transfer Radical Process for the Introduction of the Trifluoromethyl Group” Organic Letters, 2001, vol. 3, No. 7, pp. 1069-1071.
Chung Po Wen
Shih Kuo Chen
Wang Mei Hua
Industrial Technology Research Institute
Kosack Joseph R
Shiao Rei-Tsang
Thomas Kayden Horstemeyer & Risley
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