POLYDITHIOCARBONATE AND ITS PRODUCTION

Title:

POLYDITHIOCARBONATE AND ITS PRODUCTION

Document Type and Number:

Japanese Patent JPH1067854

Kind Code:

A

Abstract:

To obtain a polydithiocarbonate useful as an optical material, etc., by adopting a specific molecular structure.

This polydithiocarbonate comprises repeating units represented by formula I (wherein R1, R2 and R3 are each independently H or lower alkyl), has a number-average mol.wt. of 5,000-50,000, and is produced by reacting a compd. represented by formula II (wherein Rl, R2, and R3 are each as defined above) in the presence of a Lewis acid donating an alkyl cation. A pref. Lewis acid is an alkyl trifluoromethanesulfonate. A reaction solvent is not always necessary and can be used without any limitation, exapmles being terahydrofuran, chloroform, dioxane, and acetone. The reaction is conducted pref. at 40-120°C.

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Inventors:

ENDO TAKESHI
CHIYOI UONMUN
MITA FUMIO
KIHARA NOBUHIRO

Application Number:

JP22623696A

Publication Date:

March 10, 1998

Filing Date:

August 28, 1996

Export Citation:

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Assignee:

KYOWA HAKKO KOGYO KK

International Classes:

C08G75/28; C08G75/00; (IPC1-7): C08G75/28

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