Title:
PRODUCTION OF RING-OPENING POLYMER
Document Type and Number:
Japanese Patent JP3236700
Kind Code:
B2
Abstract:
PURPOSE: To obtain a lactone polyester having a narrow mol.wt. distribution by reacting a specific lactone with a poly(silyl ether).
CONSTITUTION: A hexaalkyldisilazane or a trialkylsilyl halide is reacted with a polyhydric alcohol to obtain a poly(silyl ether) represented by formula II (where R1 is a 1-8C alkyl; A is a residue formed from a di- to hexahydric alcohol by the removal of (2+q) hydroxyl groups; and (q) is 0-4). The poly(silyl ether) is reacted with a lactone represented by formula I (wherein R2 is a 2-10C linear or branched alkylene) in an amount of at least 0.0001 equivalent to the lactone in the presence of an alkali metal fluoride or a tetraalkylammonium fluoride at 0-150°C. According to need, the resulting reactional product is hydrolyzed to remove the terminal trialkylsilyloxy groups therefrom. Thus, a ring- opening polymer represented by formula III [wherein (m), (n), and (p) each is 1-200 and X is H or Si(R1)n] is obtained.
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Inventors:
Yoko Nambu
Go Endo
Go Endo
Application Number:
JP10961793A
Publication Date:
December 10, 2001
Filing Date:
May 11, 1993
Export Citation:
Assignee:
Asahi Denka Kogyo Co., Ltd.
International Classes:
C08G63/08; C08G63/78; C08G63/82; C08L101/16; (IPC1-7): C08G63/08
Domestic Patent References:
| JP4283591A |
Attorney, Agent or Firm:
Osamu Hatori