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4-3. Preparation of a Polythioester by the Reaction of Diphenyl trans-Cyclohexane1,4-dicarboxylate and 1,6-Hexanedithiol . . . . . . . . . . . . . . . . 4-4. Preparation of Polythioesters by the Reaction of Adipoyl Chloride-Pyridine Complex with Hexanedithiol . . . . . . . . . . . . . . . . . . . . . . . 5. Miscellaneous Preparations and Methods . . . . . . . . . . . . . . . . . . References . . . . .

74. V. Kuznetsov and J. N. Faizullin, Vysokomol. Soedin. 5, 347 (1963); Chem. Abstr. 59, 12935 (1963). 75. Research Institute for Synthetic Fibers, Japanese Patent 6,642 (1963); Chem. Abstr. 61, 1972 (1964). 76. H. Frazer, J. Polym. , Part A 3, 3699 (1965). 77. J. Harmon and R. M. S. Patent 2,411,722 (1946); Chem. Abstr. 41, 2275e (1947). 78. M. Haruta, S. Harada, K. Kageno, T. Ueda, and T. Hashimoto, Japan, Kokai 75-12,177 (2/7/75); Chem. Abstr. 84(12), 74852K (1976). 79. B. Golubev, I. V. Semonikhina, M.

A. S. Patent 2,703,793 (1955). eN. L. S. Patent 3,313,785 (1967). fG. Steinbach van Gover, French Patent 1,390,384 (1965); Chem. Abstr. 62, 14898 (1965). 48 6 163 gm I 34 1. 0 a The polysulfones are prepared at about 100~ at 75-90 psig pressure. After the excess sulfur dioxide is vented the latex is coagulated with methanol to give the polymer. The polymer is washed with water and dried for 72 hr at 140~ allowed to w a r m to r o o m temperature (25~ over a 3-hr period. 05% S). In a similar manner propylene-n-butene polysulfone, 1-butene polysulfone, and 2-butene polysulfone are prepared [60].

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