Process for the production of low molecular weight polyoxyalkylene polyols
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United States of America Patent
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Jan 30, 2018
Issued Date -
N/A
app pub date -
Dec 22, 2015
filing date -
Dec 22, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
This invention relates to a semi-batch process for producing low molecular weight polyoxyalkylene polyols. These polyoxyalkylene polyols are characterized by hydroxyl numbers of from 200 to 500. In accordance with the invention, the first alkylene oxide block used to activate the DMC catalyst comprises from 50% to 100% by weight of propylene oxide and from 0% to 50% by weight of ethylene oxide; and the second alkylene oxide block comprises from 50% to 100% by weight of propylene oxide and from 0% to 50% by weight of ethylene oxide. A continuously added starter is present. Optionally, a third alkylene oxide block can be added. The addition of the second alkylene oxide block and of the third alkylene oxide block when present is completed with a space time yield of greater than or equal to 250 kg/m3/hr.
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- 1 Citation Count
- C08G Class
- 39.35 % this patent is cited more than
- 7 Age
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