Process for making polyether diols
US11124604B2 · kind B2 · utility
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11Claims
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Key dates
| Filing date | Jun 12, 2017 |
| Grant date | Sep 21, 2021 |
| Priority date | — |
| Expiry date | May 13, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2650/56
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polyether diols characterized by a hydroxyl number of 56 or lower, high average functionality and high primary hydroxyl content are prepared by alkoxylating an unsaturated alcohol in multiple steps to form a polyether monol that contains 39% or more primary hydroxyl groups, and then reacting the polyether monol with a mercaptoalcohol that has a primary hydroxyl group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.