Method for producing aliphatic polyester having increased molecular weight
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United States of America Patent
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Oct 21, 2014
Grant Date -
Feb 20, 2014
app pub date -
Jan 17, 2012
filing date -
Apr 7, 2011
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Abstract
The problem to be solved by the present invention is to provide a method for continuously and effectively producing an aliphatic polyester having an increased molecular weight which prevents evaporation of diisocyanate at the step of mixing the diisocyanate with the aliphatic polyester prepolymer in a molten state at a temperature not lower than the melting point of the prepolymer and enables uniform mixing of the diisocyanate with the aliphatic polyester prepolymer. In order to solve this problem, the present invention provides a method for producing an aliphatic polyester having an increased molecular weight comprising the steps of:
- (i) quantitatively injecting a diisocyanate into an aliphatic polyester prepolymer which has a number average molecular weight of 5000 or higher and has terminal hydroxyl groups and in which at least one acid component is a succinic acid compound, in a molten state at a temperature not lower than the melting point thereof, whereinthe amount of diisocyanate is equivalent to between one tenth and two times the amount of the hydroxyl groups in the aliphatic polyester prepolymer,(ii) quantitatively and continuously mixing the diisocyanate-containing aliphatic polyester prepolymer obtained at step (i) by a static mixer, discharging same from the static mixer, and then supplying same to a coupling reaction tank, and(iii) reacting the aliphatic polyester prepolymer with the diisocyanate in the coupling reaction tank.
First Claim
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- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
- SHOWA DENKO K.K.
International Classification(s)
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- [Patents Count]
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Ichikawa, Yasushi | Tokyo, JP | 214 | 4119 |
Ishii, Akira | Tokyo, JP | 183 | 1679 |
Kimura, Hideharu | Tokyo, JP | 13 | 93 |
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