JPS5721421A - Production of high-molecular weight polysiloxane - Google Patents
Production of high-molecular weight polysiloxaneInfo
- Publication number
- JPS5721421A JPS5721421A JP9656780A JP9656780A JPS5721421A JP S5721421 A JPS5721421 A JP S5721421A JP 9656780 A JP9656780 A JP 9656780A JP 9656780 A JP9656780 A JP 9656780A JP S5721421 A JPS5721421 A JP S5721421A
- Authority
- JP
- Japan
- Prior art keywords
- polysiloxane
- production
- low
- molecular weight
- carbodiimide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
PURPOSE: To obtain readily a high-MW polysiloxane having excellent storage stability, by dehydration-condensing a low-MW polysiloxane obtained by (co)hydrolysis of a chlorosilane, using a carbodiimide as a condensation catalyst.
CONSTITUTION: A hydroxyl group-containing low-MW polysiloxane is obtained by dissolving, in an organic solvent, a chlorosilane represented by the general formula: RSiCl3 and/or R2SiCl2, wherein R is a hydrocarbyl, e.g., phenyltrichlorosilane or dimethoxydichlorosilane, and pouring the solution into a large amount of water to effect (co)hydrolysis. Next, the high-MW polysiloxane of the purpose is obtained by dissolving the low-MW polysiloxane in an organic solvent, and dehydration-condensing the polysiloxane at a temperature of about 120°C using as a condensation catalyst a carbodiimide, e.g., dibenzylcarbodiimide or diethylcarbodiimide.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9656780A JPS5721421A (en) | 1980-07-15 | 1980-07-15 | Production of high-molecular weight polysiloxane |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9656780A JPS5721421A (en) | 1980-07-15 | 1980-07-15 | Production of high-molecular weight polysiloxane |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5721421A true JPS5721421A (en) | 1982-02-04 |
JPS6235405B2 JPS6235405B2 (en) | 1987-08-01 |
Family
ID=14168588
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9656780A Granted JPS5721421A (en) | 1980-07-15 | 1980-07-15 | Production of high-molecular weight polysiloxane |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5721421A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7858312B2 (en) | 1998-05-06 | 2010-12-28 | Duke University | Method of treating bladder and lower urinary tract syndromes |
-
1980
- 1980-07-15 JP JP9656780A patent/JPS5721421A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7858312B2 (en) | 1998-05-06 | 2010-12-28 | Duke University | Method of treating bladder and lower urinary tract syndromes |
Also Published As
Publication number | Publication date |
---|---|
JPS6235405B2 (en) | 1987-08-01 |
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